INSTRUCTION stringlengths 1 8.43k | RESPONSE stringlengths 75 104k |
|---|---|
Returns a Google images query formatted as a GoogleSearch list object. | def search_images(q, start=0, size="", wait=10, asynchronous=False, cached=False):
""" Returns a Google images query formatted as a GoogleSearch list object.
"""
service = GOOGLE_IMAGES
return GoogleSearch(q, start, service, size, wait, asynchronous, cached) |
Returns a Google news query formatted as a GoogleSearch list object. | def search_news(q, start=0, wait=10, asynchronous=False, cached=False):
""" Returns a Google news query formatted as a GoogleSearch list object.
"""
service = GOOGLE_NEWS
return GoogleSearch(q, start, service, "", wait, asynchronous, cached) |
Returns a Google blogs query formatted as a GoogleSearch list object. | def search_blogs(q, start=0, wait=10, asynchronous=False, cached=False):
""" Returns a Google blogs query formatted as a GoogleSearch list object.
"""
service = GOOGLE_BLOGS
return GoogleSearch(q, start, service, "", wait, asynchronous, cached) |
Parses the text data from an XML element defined by tag. | def _parse(self, str):
""" Parses the text data from an XML element defined by tag.
"""
str = replace_entities(str)
str = strip_tags(str)
str = collapse_spaces(str)
return str |
Creates a unique filename in the cache for the id. | def hash(self, id):
""" Creates a unique filename in the cache for the id.
"""
h = md5(id).hexdigest()
return os.path.join(self.path, h+self.type) |
Returns the age of the cache entry in days. | def age(self, id):
""" Returns the age of the cache entry, in days.
"""
path = self.hash(id)
if os.path.exists(path):
modified = datetime.datetime.fromtimestamp(os.stat(path)[8])
age = datetime.datetime.today() - modified
return age.days
else:
return 0 |
Returns the angle between two points. | def angle(x0, y0, x1, y1):
""" Returns the angle between two points.
"""
return degrees(atan2(y1-y0, x1-x0)) |
Returns the distance between two points. | def distance(x0, y0, x1, y1):
""" Returns the distance between two points.
"""
return sqrt(pow(x1-x0, 2) + pow(y1-y0, 2)) |
Returns the location of a point by rotating around origin ( x0 y0 ). | def coordinates(x0, y0, distance, angle):
""" Returns the location of a point by rotating around origin (x0,y0).
"""
return (x0 + cos(radians(angle)) * distance,
y0 + sin(radians(angle)) * distance) |
Returns the coordinates of ( x y ) rotated around origin ( x0 y0 ). | def rotate(x, y, x0, y0, angle):
""" Returns the coordinates of (x,y) rotated around origin (x0,y0).
"""
x, y = x - x0, y - y0
a, b = cos(radians(angle)), sin(radians(angle))
return (x * a - y * b + x0,
y * a + x * b + y0) |
Returns the reflection of a point through origin ( x0 y0 ). | def reflect(x, y, x0, y0, d=1.0, a=180):
""" Returns the reflection of a point through origin (x0,y0).
"""
return coordinates(x0, y0, d * distance(x0, y0, x, y),
a + angle(x0, y0, x, y)) |
Returns the linear interpolation between a and b for time t between 0. 0 - 1. 0. For example: lerp ( 100 200 0. 5 ) = > 150. | def lerp(a, b, t):
""" Returns the linear interpolation between a and b for time t between 0.0-1.0.
For example: lerp(100, 200, 0.5) => 150.
"""
if t < 0.0:
return a
if t > 1.0:
return b
return a + (b - a) * t |
Returns a smooth transition between 0. 0 and 1. 0 using Hermite interpolation ( cubic spline ) where x is a number between a and b. The return value will ease ( slow down ) as x nears a or b. For x smaller than a returns 0. 0. For x bigger than b returns 1. 0. | def smoothstep(a, b, x):
""" Returns a smooth transition between 0.0 and 1.0 using Hermite interpolation (cubic spline),
where x is a number between a and b. The return value will ease (slow down) as x nears a or b.
For x smaller than a, returns 0.0. For x bigger than b, returns 1.0.
"""
if x < a:
return 0.0
if x >= b:
return 1.0
x = float(x - a) / (b - a)
return x * x * (3 - 2 * x) |
Determines the intersection point of two lines or two finite line segments if infinite = False. When the lines do not intersect returns an empty list. | def line_line_intersection(x1, y1, x2, y2, x3, y3, x4, y4, infinite=False):
""" Determines the intersection point of two lines, or two finite line segments if infinite=False.
When the lines do not intersect, returns an empty list.
"""
# Based on: P. Bourke, http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
ua = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3)
ub = (x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)
d = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1)
if d == 0:
if ua == ub == 0:
# The lines are coincident
return []
else:
# The lines are parallel.
return []
ua /= float(d)
ub /= float(d)
if not infinite and not (0 <= ua <= 1 and 0 <= ub <= 1):
# Intersection point is not within both line segments.
return None, None
return [(x1 + ua * (x2 - x1),
y1 + ua * (y2 - y1))] |
Returns a list of points where the circle and the line intersect. Returns an empty list when the circle and the line do not intersect. | def circle_line_intersection(cx, cy, radius, x1, y1, x2, y2, infinite=False):
""" Returns a list of points where the circle and the line intersect.
Returns an empty list when the circle and the line do not intersect.
"""
# Based on: http://www.vb-helper.com/howto_net_line_circle_intersections.html
dx = x2 - x1
dy = y2 - y1
A = dx * dx + dy * dy
B = 2 * (dx * (x1 - cx) + dy * (y1 - cy))
C = pow(x1 - cx, 2) + pow(y1 - cy, 2) - radius * radius
det = B * B - 4 * A * C
if A <= 0.0000001 or det < 0:
return []
elif det == 0:
# One point of intersection.
t = -B / (2 * A)
return [(x1 + t * dx, y1 + t * dy)]
else:
# Two points of intersection.
# A point of intersection lies on the line segment if 0 <= t <= 1,
# and on an extension of the segment otherwise.
points = []
det2 = sqrt(det)
t1 = (-B + det2) / (2 * A)
t2 = (-B - det2) / (2 * A)
if infinite or 0 <= t1 <= 1:
points.append((x1 + t1 * dx, y1 + t1 * dy))
if infinite or 0 <= t2 <= 1:
points.append((x1 + t2 * dx, y1 + t2 * dy))
return points |
Ray casting algorithm. Determines how many times a horizontal ray starting from the point intersects with the sides of the polygon. If it is an even number of times the point is outside if odd inside. The algorithm does not always report correctly when the point is very close to the boundary. The polygon is passed as a list of ( x y ) - tuples. | def point_in_polygon(points, x, y):
""" Ray casting algorithm.
Determines how many times a horizontal ray starting from the point
intersects with the sides of the polygon.
If it is an even number of times, the point is outside, if odd, inside.
The algorithm does not always report correctly when the point is very close to the boundary.
The polygon is passed as a list of (x,y)-tuples.
"""
odd = False
n = len(points)
for i in range(n):
j = i < n - 1 and i + 1 or 0
x0, y0 = points[i][0], points[i][1]
x1, y1 = points[j][0], points[j][1]
if (y0 < y and y1 >= y) or (y1 < y and y0 >= y):
if x0 + (y - y0) / (y1 - y0) * (x1 - x0) < x:
odd = not odd
return odd |
Returns the 3x3 matrix multiplication of A and B. Note that scale () translate () rotate () work with premultiplication e. g. the matrix A followed by B = BA and not AB. | def _mmult(self, a, b):
""" Returns the 3x3 matrix multiplication of A and B.
Note that scale(), translate(), rotate() work with premultiplication,
e.g. the matrix A followed by B = BA and not AB.
"""
# No need to optimize (C version is just as fast).
return [
a[0] * b[0] + a[1] * b[3],
a[0] * b[1] + a[1] * b[4],
0,
a[3] * b[0] + a[4] * b[3],
a[3] * b[1] + a[4] * b[4],
0,
a[6] * b[0] + a[7] * b[3] + b[6],
a[6] * b[1] + a[7] * b[4] + b[7],
1
] |
Multiplying a matrix by its inverse produces the identity matrix. | def invert(self):
""" Multiplying a matrix by its inverse produces the identity matrix.
"""
m = self.matrix
d = m[0] * m[4] - m[1] * m[3]
self.matrix = [
m[4] / d, -m[1] / d, 0,
-m[3] / d, m[0] / d, 0,
(m[3] * m[7] - m[4] * m[6]) / d,
-(m[0] * m[7] - m[1] * m[6]) / d,
1
] |
Returns the new coordinates of ( x y ) after transformation. | def transform_point(self, x, y):
""" Returns the new coordinates of (x,y) after transformation.
"""
m = self.matrix
return (x*m[0]+y*m[3]+m[6], x*m[1]+y*m[4]+m[7]) |
Returns a BezierPath object with the transformation applied. | def transform_path(self, path):
""" Returns a BezierPath object with the transformation applied.
"""
p = path.__class__() # Create a new BezierPath.
for pt in path:
if pt.cmd == "close":
p.closepath()
elif pt.cmd == "moveto":
p.moveto(*self.apply(pt.x, pt.y))
elif pt.cmd == "lineto":
p.lineto(*self.apply(pt.x, pt.y))
elif pt.cmd == "curveto":
vx1, vy1 = self.apply(pt.ctrl1.x, pt.ctrl1.y)
vx2, vy2 = self.apply(pt.ctrl2.x, pt.ctrl2.y)
x, y = self.apply(pt.x, pt.y)
p.curveto(vx1, vy1, vx2, vy2, x, y)
return p |
Return True if a part of the two bounds overlaps. | def intersects(self, b):
""" Return True if a part of the two bounds overlaps.
"""
return max(self.x, b.x) < min(self.x+self.width, b.x+b.width) \
and max(self.y, b.y) < min(self.y+self.height, b.y+b.height) |
Returns bounds that encompass the intersection of the two. If there is no overlap between the two None is returned. | def intersection(self, b):
""" Returns bounds that encompass the intersection of the two.
If there is no overlap between the two, None is returned.
"""
if not self.intersects(b):
return None
mx, my = max(self.x, b.x), max(self.y, b.y)
return Bounds(mx, my,
min(self.x+self.width, b.x+b.width) - mx,
min(self.y+self.height, b.y+b.height) - my) |
Returns bounds that encompass the union of the two. | def union(self, b):
""" Returns bounds that encompass the union of the two.
"""
mx, my = min(self.x, b.x), min(self.y, b.y)
return Bounds(mx, my,
max(self.x+self.width, b.x+b.width) - mx,
max(self.y+self.height, b.y+b.height) - my) |
Returns True if the given point or rectangle falls within the bounds. | def contains(self, *a):
""" Returns True if the given point or rectangle falls within the bounds.
"""
if len(a) == 2: a = [Point(a[0], a[1])]
if len(a) == 1:
a = a[0]
if isinstance(a, Point):
return a.x >= self.x and a.x <= self.x+self.width \
and a.y >= self.y and a.y <= self.y+self.height
if isinstance(a, Bounds):
return a.x >= self.x and a.x+a.width <= self.x+self.width \
and a.y >= self.y and a.y+a.height <= self.y+self.height |
Prints an error message the help message and quits | def error(message):
'''Prints an error message, the help message and quits'''
global parser
print (_("Error: ") + message)
print ()
parser.print_help()
sys.exit() |
Draws an ellipse starting from ( x y ) | def ellipse(self, x, y, width, height, draw=True, **kwargs):
'''Draws an ellipse starting from (x,y)'''
path = self.BezierPath(**kwargs)
path.ellipse(x,y,width,height)
if draw:
path.draw()
return path |
Draws a line from ( x1 y1 ) to ( x2 y2 ) | def line(self, x1, y1, x2, y2, draw=True):
'''Draws a line from (x1,y1) to (x2,y2)'''
p = self._path
self.newpath()
self.moveto(x1,y1)
self.lineto(x2,y2)
self.endpath(draw=draw)
self._path = p
return p |
Sets the current colormode ( can be RGB or HSB ) and eventually the color range. | def colormode(self, mode=None, crange=None):
'''Sets the current colormode (can be RGB or HSB) and eventually
the color range.
If called without arguments, it returns the current colormode.
'''
if mode is not None:
if mode == "rgb":
self.color_mode = Bot.RGB
elif mode == "hsb":
self.color_mode = Bot.HSB
else:
raise NameError, _("Only RGB and HSB colormodes are supported.")
if crange is not None:
self.color_range = crange
return self.color_mode |
Sets a fill color applying it to new paths. | def fill(self,*args):
'''Sets a fill color, applying it to new paths.'''
self._fillcolor = self.color(*args)
return self._fillcolor |
Set a stroke color applying it to new paths. | def stroke(self,*args):
'''Set a stroke color, applying it to new paths.'''
self._strokecolor = self.color(*args)
return self._strokecolor |
Draws an outlined path of the input text | def textpath(self, txt, x, y, width=None, height=1000000, enableRendering=False, **kwargs):
'''
Draws an outlined path of the input text
'''
txt = self.Text(txt, x, y, width, height, **kwargs)
path = txt.path
if draw:
path.draw()
return path |
Returns the width and height of a string of text as a tuple ( according to current font settings ). | def textmetrics(self, txt, width=None, height=None, **kwargs):
'''Returns the width and height of a string of text as a tuple
(according to current font settings).
'''
# for now only returns width and height (as per Nodebox behaviour)
# but maybe we could use the other data from cairo
# we send doRender=False to prevent the actual rendering process, only the path generation is enabled
# not the most efficient way, but it generates accurate results
txt = self.Text(txt, 0, 0, width, height, enableRendering=False, **kwargs)
return txt.metrics |
Raph Levien s code draws fast LINETO segments. | def draw_cornu_flat(x0, y0, t0, t1, s0, c0, flip, cs, ss, cmd):
""" Raph Levien's code draws fast LINETO segments.
"""
for j in range(0, 100):
t = j * .01
s, c = eval_cornu(t0 + t * (t1 - t0))
s *= flip
s -= s0
c -= c0
#print '%', c, s
x = c * cs - s * ss
y = s * cs + c * ss
print_pt(x0 + x, y0 + y, cmd)
cmd = 'lineto'
return cmd |
Mark Meyer s code draws elegant CURVETO segments. | def draw_cornu_bezier(x0, y0, t0, t1, s0, c0, flip, cs, ss, cmd, scale, rot):
""" Mark Meyer's code draws elegant CURVETO segments.
"""
s = None
for j in range(0, 5):
# travel along the function two points at a time (at time t and t2)
# the first time through we'll need to get both points
# after that we only need the second point because the old second point
# becomes the new first point
t = j * .2
t2 = t+ .2
curvetime = t0 + t * (t1 - t0)
curvetime2 = t0 + t2 * (t1 - t0)
Dt = (curvetime2 - curvetime) * scale
if not s:
# get first point
# avoid calling this again: the next time though x,y will equal x3, y3
s, c = eval_cornu(curvetime)
s *= flip
s -= s0
c -= c0
# calculate derivative of fresnel function at point to get tangent slope
# just take the integrand of the fresnel function
dx1 = cos(pow(curvetime, 2) + (flip * rot))
dy1 = flip * sin(pow(curvetime, 2) + (flip *rot))
# x,y = first point on function
x = ((c * cs - s * ss) +x0)
y = ((s * cs + c * ss) + y0)
#evaluate the fresnel further along the function to look ahead to the next point
s2,c2 = eval_cornu(curvetime2)
s2 *= flip
s2 -= s0
c2 -= c0
dx2 = cos(pow(curvetime2, 2) + (flip * rot))
dy2 = flip * sin(pow(curvetime2, 2) + (flip * rot))
# x3, y3 = second point on function
x3 = ((c2 * cs - s2 * ss)+x0)
y3 = ((s2 * cs + c2 * ss)+y0)
# calculate control points
x1 = (x + ((Dt/3.0) * dx1))
y1 = (y + ((Dt/3.0) * dy1))
x2 = (x3 - ((Dt/3.0) * dx2))
y2 = (y3 - ((Dt/3.0) * dy2))
if cmd == 'moveto':
print_pt(x, y, cmd)
cmd = 'curveto'
print_crv(x1, y1, x2, y2, x3, y3)
dx1, dy1 = dx2, dy2
x,y = x3, y3
return cmd |
Returns a Yahoo web query formatted as a YahooSearch list object. | def search(q, start=1, count=10, context=None, wait=10, asynchronous=False, cached=False):
""" Returns a Yahoo web query formatted as a YahooSearch list object.
"""
service = YAHOO_SEARCH
return YahooSearch(q, start, count, service, context, wait, asynchronous, cached) |
Returns a Yahoo images query formatted as a YahooSearch list object. | def search_images(q, start=1, count=10, wait=10, asynchronous=False, cached=False):
""" Returns a Yahoo images query formatted as a YahooSearch list object.
"""
service = YAHOO_IMAGES
return YahooSearch(q, start, count, service, None, wait, asynchronous, cached) |
Returns a Yahoo news query formatted as a YahooSearch list object. | def search_news(q, start=1, count=10, wait=10, asynchronous=False, cached=False):
""" Returns a Yahoo news query formatted as a YahooSearch list object.
"""
service = YAHOO_NEWS
return YahooSearch(q, start, count, service, None, wait, asynchronous, cached) |
Returns list of suggested spelling corrections for the given query. | def suggest_spelling(q, wait=10, asynchronous=False, cached=False):
""" Returns list of suggested spelling corrections for the given query.
"""
return YahooSpelling(q, wait, asynchronous, cached) |
Performs a Yahoo sort on the given list. Sorts the items in the list according to the result count Yahoo yields on an item. Setting a context sorts the items according to their relation to this context ; for example sorting [ red green blue ] by love yields red as the highest results likely because red is the color commonly associated with love. | def sort(words, context="", strict=True, relative=True, service=YAHOO_SEARCH,
wait=10, asynchronous=False, cached=False):
"""Performs a Yahoo sort on the given list.
Sorts the items in the list according to
the result count Yahoo yields on an item.
Setting a context sorts the items according
to their relation to this context;
for example sorting [red, green, blue] by "love"
yields red as the highest results,
likely because red is the color commonly associated with love.
"""
results = []
for word in words:
q = word + " " + context
q.strip()
if strict: q = "\""+q+"\""
r = YahooSearch(q, 1, 1, service, context, wait, asynchronous, cached)
results.append(r)
results.sort(YahooResults.__cmp__)
results.reverse()
if relative and len(results) > 0:
sum = 0.000000000000000001
for r in results: sum += r.total
for r in results: r.total /= float(sum)
results = [(r.query, r.total) for r in results]
return results |
Parses the text data from an XML element defined by tag. | def _parse(self, e, tag):
""" Parses the text data from an XML element defined by tag.
"""
tags = e.getElementsByTagName(tag)
children = tags[0].childNodes
if len(children) != 1: return None
assert children[0].nodeType == xml.dom.minidom.Element.TEXT_NODE
s = children[0].nodeValue
s = format_data(s)
s = replace_entities(s)
return s |
Creates a new layer from file Layer PIL Image. If img is an image file or PIL Image object Creates a new layer with the given image file. The image is positioned on the canvas at x y. If img is a Layer uses that layer s x and y position and name. | def layer(self, img, x=0, y=0, name=""):
"""Creates a new layer from file, Layer, PIL Image.
If img is an image file or PIL Image object,
Creates a new layer with the given image file.
The image is positioned on the canvas at x, y.
If img is a Layer,
uses that layer's x and y position and name.
"""
from types import StringType
if isinstance(img, Image.Image):
img = img.convert("RGBA")
self.layers.append(Layer(self, img, x, y, name))
return len(self.layers)-1
if isinstance(img, Layer):
img.canvas = self
self.layers.append(img)
return len(self.layers)-1
if type(img) == StringType:
img = Image.open(img)
img = img.convert("RGBA")
self.layers.append(Layer(self, img, x, y, name))
return len(self.layers)-1 |
Creates a new fill layer. Creates a new layer filled with the given rgb color. For example fill (( 255 0 0 )) creates a red fill. The layers fills the entire canvas by default. | def fill(self, rgb, x=0, y=0, w=None, h=None, name=""):
"""Creates a new fill layer.
Creates a new layer filled with the given rgb color.
For example, fill((255,0,0)) creates a red fill.
The layers fills the entire canvas by default.
"""
if w == None: w = self.w - x
if h == None: h = self.h - y
img = Image.new("RGBA", (w,h), rgb)
self.layer(img, x, y, name) |
Creates a gradient layer. Creates a gradient layer that is usually used together with the mask () function. All the image functions work on gradients so they can easily be flipped rotated scaled inverted made brighter or darker... Styles for gradients are LINEAR RADIAL and DIAMOND. | def gradient(self, style=LINEAR, w=1.0, h=1.0, name=""):
"""Creates a gradient layer.
Creates a gradient layer, that is usually used
together with the mask() function.
All the image functions work on gradients,
so they can easily be flipped, rotated, scaled, inverted,
made brighter or darker, ...
Styles for gradients are LINEAR, RADIAL and DIAMOND.
"""
from types import FloatType
w0 = self.w
h0 = self.h
if type(w) == FloatType: w *= w0
if type(h) == FloatType: h *= h0
img = Image.new("L", (int(w),int(h)), 255)
draw = ImageDraw.Draw(img)
if style == LINEAR:
for i in range(int(w)):
k = 255.0 * i/w
draw.rectangle((i, 0, i, h), fill=int(k))
if style == RADIAL:
r = min(w,h)/2
for i in range(int(r)):
k = 255 - 255.0 * i/r
draw.ellipse((w/2-r+i, h/2-r+i, w/2+r-i, h/2+r-i), fill=int(k))
if style == DIAMOND:
r = max(w,h)
for i in range(int(r)):
x = int(i*w/r*0.5)
y = int(i*h/r*0.5)
k = 255.0 * i/r
draw.rectangle((x, y, w-x, h-y), outline=int(k))
img = img.convert("RGBA")
self.layer(img, 0, 0, name="") |
Flattens the given layers on the canvas. Merges the given layers with the indices in the list on the bottom layer in the list. The other layers are discarded. | def merge(self, layers):
"""Flattens the given layers on the canvas.
Merges the given layers with the indices in the list
on the bottom layer in the list.
The other layers are discarded.
"""
layers.sort()
if layers[0] == 0: del layers[0]
self.flatten(layers) |
Flattens all layers according to their blend modes. Merges all layers to the canvas using the blend mode and opacity defined for each layer. Once flattened the stack of layers is emptied except for the transparent background ( bottom layer ). | def flatten(self, layers=[]):
"""Flattens all layers according to their blend modes.
Merges all layers to the canvas,
using the blend mode and opacity defined for each layer.
Once flattened, the stack of layers is emptied except
for the transparent background (bottom layer).
"""
#When the layers argument is omitted,
#flattens all the layers on the canvas.
#When given, merges the indexed layers.
#Layers that fall outside of the canvas are cropped:
#this should be fixed by merging to a transparent background
#large enough to hold all the given layers' data
#(=time consuming).
if layers == []:
layers = range(1, len(self.layers))
background = self.layers._get_bg()
background.name = "Background"
for i in layers:
layer = self.layers[i]
#Determine which portion of the canvas
#needs to be updated with the overlaying layer.
x = max(0, layer.x)
y = max(0, layer.y)
w = min(background.w, layer.x+layer.w)
h = min(background.h, layer.y+layer.h)
base = background.img.crop((x, y, w, h))
#Determine which piece of the layer
#falls within the canvas.
x = max(0, -layer.x)
y = max(0, -layer.y)
w -= layer.x
h -= layer.y
blend = layer.img.crop((x, y, w, h))
#Buffer layer blend modes:
#the base below is a flattened version
#of all the layers below this one,
#on which to merge this blended layer.
if layer.blend == NORMAL:
buffer = blend
if layer.blend == MULTIPLY:
buffer = ImageChops.multiply(base, blend)
if layer.blend == SCREEN:
buffer = ImageChops.screen(base, blend)
if layer.blend == OVERLAY:
buffer = Blend().overlay(base, blend)
if layer.blend == HUE:
buffer = Blend().hue(base, blend)
if layer.blend == COLOR:
buffer = Blend().color(base, blend)
#Buffer a merge between the base and blend
#according to the blend's alpha channel:
#the base shines through where the blend is less opaque.
#Merging the first layer to the transparent canvas
#works slightly different than the other layers.
alpha = buffer.split()[3]
if i == 1:
buffer = Image.composite(base, buffer, base.split()[3])
else:
buffer = Image.composite(buffer, base, alpha)
#The alpha channel becomes a composite of
#this layer and the base:
#the base's (optional) tranparent background
#is retained in arrays where the blend layer
#is transparent as well.
alpha = ImageChops.lighter(alpha, base.split()[3])
buffer.putalpha(alpha)
#Apply the layer's opacity,
#merging the buffer to the base with
#the given layer opacity.
base = Image.blend(base, buffer, layer.alpha)
#Merge the base to the flattened canvas.
x = max(0, layer.x)
y = max(0, layer.y)
background.img.paste(base, (x,y))
layers.reverse()
for i in layers: del self.layers[i]
img = Image.new("RGBA", (self.w,self.h), (255,255,255,0))
self.layers._set_bg(Layer(self, img, 0, 0, name="_bg"))
if len(self.layers) == 1:
self.layers.append(background)
else:
self.layers.insert(layers[-1], background) |
Exports the flattened canvas. Flattens the canvas. PNG retains the alpha channel information. Other possibilities are JPEG and GIF. | def export(self, filename):
"""Exports the flattened canvas.
Flattens the canvas.
PNG retains the alpha channel information.
Other possibilities are JPEG and GIF.
"""
self.flatten()
self.layers[1].img.save(filename)
return filename |
Places the flattened canvas in NodeBox. Exports to a temporary PNG file. Draws the PNG in NodeBox using the image () command. Removes the temporary file. | def draw(self, x, y):
"""Places the flattened canvas in NodeBox.
Exports to a temporary PNG file.
Draws the PNG in NodeBox using the image() command.
Removes the temporary file.
"""
try:
from time import time
import md5
from os import unlink
m = md5.new()
m.update(str(time()))
filename = "photobot" + str(m.hexdigest()) + ".png"
self.export(filename)
_ctx.image(filename, x, y)
unlink(filename)
except:
pass |
Returns this layer s index in the canvas. layers []. Searches the position of this layer in the canvas layers list return None when not found. | def index(self):
"""Returns this layer's index in the canvas.layers[].
Searches the position of this layer in the canvas'
layers list, return None when not found.
"""
for i in range(len(self.canvas.layers)):
if self.canvas.layers[i] == self: break
if self.canvas.layers[i] == self:
return i
else:
return None |
Returns a copy of the layer. This is different from the duplicate () method which duplicates the layer as a new layer on the canvas. The copy () method returns a copy of the layer that can be added to a different canvas. | def copy(self):
"""Returns a copy of the layer.
This is different from the duplicate() method,
which duplicates the layer as a new layer on the canvas.
The copy() method returns a copy of the layer
that can be added to a different canvas.
"""
layer = Layer(None, self.img.copy(), self.x, self.y, self.name)
layer.w = self.w
layer.h = self.h
layer.alpha = self.alpha
layer.blend = self.blend
return layer |
Removes this layer from the canvas. | def delete(self):
"""Removes this layer from the canvas.
"""
i = self.index()
if i != None: del self.canvas.layers[i] |
Moves the layer up in the stacking order. | def up(self):
"""Moves the layer up in the stacking order.
"""
i = self.index()
if i != None:
del self.canvas.layers[i]
i = min(len(self.canvas.layers), i+1)
self.canvas.layers.insert(i, self) |
Moves the layer down in the stacking order. | def down(self):
"""Moves the layer down in the stacking order.
"""
i = self.index()
if i != None:
del self.canvas.layers[i]
i = max(0, i-1)
self.canvas.layers.insert(i, self) |
Applies the polygonal lasso tool on a layer. The path paramater is a list of points either [ x1 y1 x2 y2 x3 y3... ] or [ ( x1 y1 ) ( x2 y2 ) ( x3 y3 )... ] The parts of the layer that fall outside this polygonal area are cut. The selection is not anti - aliased but the feather parameter creates soft edges. | def select(self, path, feather=True):
"""Applies the polygonal lasso tool on a layer.
The path paramater is a list of points,
either [x1, y1, x2, y2, x3, y3, ...]
or [(x1,y1), (x2,y2), (x3,y3), ...]
The parts of the layer that fall outside
this polygonal area are cut.
The selection is not anti-aliased,
but the feather parameter creates soft edges.
"""
w, h = self.img.size
mask = Image.new("L", (w,h), 0)
draw = ImageDraw.Draw(mask)
draw = ImageDraw.Draw(mask)
draw.polygon(path, fill=255)
if feather:
mask = mask.filter(ImageFilter.SMOOTH_MORE)
mask = mask.filter(ImageFilter.SMOOTH_MORE)
mask = ImageChops.darker(mask, self.img.split()[3])
self.img.putalpha(mask) |
Masks the layer below with this layer. Commits the current layer to the alpha channel of the previous layer. Primarily mask () is useful when using gradient layers as masks on images below. For example: canvas. layer ( image. jpg ) canvas. gradient () canvas. layer ( 2 ). flip () canvas. layer ( 2 ). mask () Adds a white - to - black linear gradient to the alpha channel of image. jpg making it evolve from opaque on the left to transparent on the right. | def mask(self):
"""Masks the layer below with this layer.
Commits the current layer to the alpha channel of
the previous layer. Primarily, mask() is useful when
using gradient layers as masks on images below.
For example:
canvas.layer("image.jpg")
canvas.gradient()
canvas.layer(2).flip()
canvas.layer(2).mask()
Adds a white-to-black linear gradient to
the alpha channel of image.jpg,
making it evolve from opaque on
the left to transparent on the right.
"""
if len(self.canvas.layers) < 2: return
i = self.index()
if i == 0: return
layer = self.canvas.layers[i-1]
alpha = Image.new("L", layer.img.size, 0)
#Make a composite of the mask layer in grayscale
#and its own alpha channel.
mask = self.canvas.layers[i]
flat = ImageChops.darker(mask.img.convert("L"), mask.img.split()[3])
alpha.paste(flat, (mask.x,mask.y))
alpha = ImageChops.darker(alpha, layer.img.split()[3])
layer.img.putalpha(alpha)
self.delete() |
Creates a copy of the current layer. This copy becomes the top layer on the canvas. | def duplicate(self):
"""Creates a copy of the current layer.
This copy becomes the top layer on the canvas.
"""
i = self.canvas.layer(self.img.copy(), self.x, self.y, self.name)
clone = self.canvas.layers[i]
clone.alpha = self.alpha
clone.blend = self.blend |
Increases or decreases the brightness in the layer. The given value is a percentage to increase or decrease the image brightness for example 0. 8 means brightness at 80%. | def brightness(self, value=1.0):
"""Increases or decreases the brightness in the layer.
The given value is a percentage to increase
or decrease the image brightness,
for example 0.8 means brightness at 80%.
"""
b = ImageEnhance.Brightness(self.img)
self.img = b.enhance(value) |
Increases or decreases the contrast in the layer. The given value is a percentage to increase or decrease the image contrast for example 1. 2 means contrast at 120%. | def contrast(self, value=1.0):
"""Increases or decreases the contrast in the layer.
The given value is a percentage to increase
or decrease the image contrast,
for example 1.2 means contrast at 120%.
"""
c = ImageEnhance.Contrast(self.img)
self.img = c.enhance(value) |
Desaturates the layer making it grayscale. Instantly removes all color information from the layer while maintaing its alpha channel. | def desaturate(self):
"""Desaturates the layer, making it grayscale.
Instantly removes all color information from the layer,
while maintaing its alpha channel.
"""
alpha = self.img.split()[3]
self.img = self.img.convert("L")
self.img = self.img.convert("RGBA")
self.img.putalpha(alpha) |
Inverts the layer. | def invert(self):
"""Inverts the layer.
"""
alpha = self.img.split()[3]
self.img = self.img.convert("RGB")
self.img = ImageOps.invert(self.img)
self.img = self.img.convert("RGBA")
self.img.putalpha(alpha) |
Positions the layer at the given coordinates. The x and y parameters define where to position the top left corner of the layer measured from the top left of the canvas. | def translate(self, x, y):
"""Positions the layer at the given coordinates.
The x and y parameters define where to position
the top left corner of the layer,
measured from the top left of the canvas.
"""
self.x = x
self.y = y |
Resizes the layer to the given width and height. When width w or height h is a floating - point number scales percentual otherwise scales to the given size in pixels. | def scale(self, w=1.0, h=1.0):
"""Resizes the layer to the given width and height.
When width w or height h is a floating-point number,
scales percentual,
otherwise scales to the given size in pixels.
"""
from types import FloatType
w0, h0 = self.img.size
if type(w) == FloatType: w = int(w*w0)
if type(h) == FloatType: h = int(h*h0)
self.img = self.img.resize((w,h), INTERPOLATION)
self.w = w
self.h = h |
Distorts the layer. Distorts the layer by translating the four corners of its bounding box to the given coordinates: upper left ( x1 y1 ) upper right ( x2 y2 ) lower right ( x3 y3 ) and lower left ( x4 y4 ). | def distort(self, x1=0,y1=0, x2=0,y2=0, x3=0,y3=0, x4=0,y4=0):
"""Distorts the layer.
Distorts the layer by translating
the four corners of its bounding box to the given coordinates:
upper left (x1,y1), upper right(x2,y2),
lower right (x3,y3) and lower left (x4,y4).
"""
w, h = self.img.size
quad = (-x1,-y1, -x4,h-y4, w-x3,w-y3, w-x2,-y2)
self.img = self.img.transform(self.img.size, Image.QUAD, quad, INTERPOLATION) |
Rotates the layer. Rotates the layer by given angle. Positive numbers rotate counter - clockwise negative numbers rotate clockwise. Rotate commands are executed instantly so many subsequent rotates will distort the image. | def rotate(self, angle):
"""Rotates the layer.
Rotates the layer by given angle.
Positive numbers rotate counter-clockwise,
negative numbers rotate clockwise.
Rotate commands are executed instantly,
so many subsequent rotates will distort the image.
"""
#When a layer rotates, its corners will fall outside
#of its defined width and height.
#Thus, its bounding box needs to be expanded.
#Calculate the diagonal width, and angle from the layer center.
#This way we can use the layers's corners
#to calculate the bounding box.
from math import sqrt, pow, sin, cos, degrees, radians, asin
w0, h0 = self.img.size
d = sqrt(pow(w0,2) + pow(h0,2))
d_angle = degrees(asin((w0*0.5) / (d*0.5)))
angle = angle % 360
if angle > 90 and angle <= 270: d_angle += 180
w = sin(radians(d_angle + angle)) * d
w = max(w, sin(radians(d_angle - angle)) * d)
w = int(abs(w))
h = cos(radians(d_angle + angle)) * d
h = max(h, cos(radians(d_angle - angle)) * d)
h = int(abs(h))
dx = int((w-w0) / 2)
dy = int((h-h0) / 2)
d = int(d)
#The rotation box's background color
#is the mean pixel value of the rotating image.
#This is the best option to avoid borders around
#the rotated image.
bg = ImageStat.Stat(self.img).mean
bg = (int(bg[0]), int(bg[1]), int(bg[2]), 0)
box = Image.new("RGBA", (d,d), bg)
box.paste(self.img, ((d-w0)/2, (d-h0)/2))
box = box.rotate(angle, INTERPOLATION)
box = box.crop(((d-w)/2+2, (d-h)/2, d-(d-w)/2, d-(d-h)/2))
self.img = box
#Since rotate changes the bounding box size,
#update the layers' width, height, and position,
#so it rotates from the center.
self.x += (self.w-w)/2
self.y += (self.h-h)/2
self.w = w
self.h = h |
Flips the layer either HORIZONTAL or VERTICAL. | def flip(self, axis=HORIZONTAL):
"""Flips the layer, either HORIZONTAL or VERTICAL.
"""
if axis == HORIZONTAL:
self.img = self.img.transpose(Image.FLIP_LEFT_RIGHT)
if axis == VERTICAL:
self.img = self.img.transpose(Image.FLIP_TOP_BOTTOM) |
Increases or decreases the sharpness in the layer. The given value is a percentage to increase or decrease the image sharpness for example 0. 8 means sharpness at 80%. | def sharpen(self, value=1.0):
"""Increases or decreases the sharpness in the layer.
The given value is a percentage to increase
or decrease the image sharpness,
for example 0.8 means sharpness at 80%.
"""
s = ImageEnhance.Sharpness(self.img)
self.img = s.enhance(value) |
Returns a histogram for each RGBA channel. Returns a 4 - tuple of lists r g b and a. Each list has 255 items a count for each pixel value. | def levels(self):
"""Returns a histogram for each RGBA channel.
Returns a 4-tuple of lists, r, g, b, and a.
Each list has 255 items, a count for each pixel value.
"""
h = self.img.histogram()
r = h[0:255]
g = h[256:511]
b = h[512:767]
a = h[768:1024]
return r, g, b, a |
Applies the overlay blend mode. Overlays image img2 on image img1. The overlay pixel combines multiply and screen: it multiplies dark pixels values and screen light values. Returns a composite image with the alpha channel retained. | def overlay(self, img1, img2):
"""Applies the overlay blend mode.
Overlays image img2 on image img1.
The overlay pixel combines multiply and screen:
it multiplies dark pixels values and screen light values.
Returns a composite image with the alpha channel retained.
"""
p1 = list(img1.getdata())
p2 = list(img2.getdata())
for i in range(len(p1)):
p3 = ()
for j in range(len(p1[i])):
a = p1[i][j] / 255.0
b = p2[i][j] / 255.0
#When overlaying the alpha channels,
#take the alpha of the most transparent layer.
if j == 3:
#d = (a+b)*0.5
#d = a
d = min(a,b)
elif a > 0.5:
d = 2*(a+b-a*b)-1
else:
d = 2*a*b
p3 += (int(d*255),)
p1[i] = p3
img = Image.new("RGBA", img1.size, 255)
img.putdata(p1)
return img |
Applies the hue blend mode. Hues image img1 with image img2. The hue filter replaces the hues of pixels in img1 with the hues of pixels in img2. Returns a composite image with the alpha channel retained. | def hue(self, img1, img2):
"""Applies the hue blend mode.
Hues image img1 with image img2.
The hue filter replaces the hues of pixels in img1
with the hues of pixels in img2.
Returns a composite image with the alpha channel retained.
"""
import colorsys
p1 = list(img1.getdata())
p2 = list(img2.getdata())
for i in range(len(p1)):
r1, g1, b1, a1 = p1[i]
r1 = r1 / 255.0
g1 = g1 / 255.0
b1 = b1 / 255.0
h1, s1, v1 = colorsys.rgb_to_hsv(r1, g1, b1)
r2, g2, b2, a2 = p2[i]
r2 = r2 / 255.0
g2 = g2 / 255.0
b2 = b2 / 255.0
h2, s2, v2 = colorsys.rgb_to_hsv(r2, g2, b2)
r3, g3, b3 = colorsys.hsv_to_rgb(h2, s1, v1)
r3 = int(r3*255)
g3 = int(g3*255)
b3 = int(b3*255)
p1[i] = (r3, g3, b3, a1)
img = Image.new("RGBA", img1.size, 255)
img.putdata(p1)
return img |
A ( 3 3 ) or ( 5 5 ) convolution kernel. The kernel argument is a list with either 9 or 25 elements the weight for each surrounding pixels to convolute. | def convolute(self, kernel, scale=None, offset=0):
"""A (3,3) or (5,5) convolution kernel.
The kernel argument is a list with either 9 or 25 elements,
the weight for each surrounding pixels to convolute.
"""
if len(kernel) == 9: size = (3,3)
elif len(kernel) == 25: size = (5,5)
else: return
if scale == None:
scale = 0
for x in kernel: scale += x
if scale == 0: scale = 1
f = ImageFilter.BuiltinFilter()
f.filterargs = size, scale, offset, kernel
self.layer.img = self.layer.img.filter(f) |
Initialise bot namespace with info in shoebot. data | def _load_namespace(self, namespace, filename=None):
"""
Initialise bot namespace with info in shoebot.data
:param filename: Will be set to __file__ in the namespace
"""
from shoebot import data
for name in dir(data):
namespace[name] = getattr(data, name)
for name in dir(self):
if name[0] != '_':
namespace[name] = getattr(self, name)
namespace['_ctx'] = self # Used in older nodebox scripts.
namespace['__file__'] = filename |
Return False if bot should quit | def _should_run(self, iteration, max_iterations):
''' Return False if bot should quit '''
if iteration == 0:
# First frame always runs
return True
if max_iterations:
if iteration < max_iterations:
return True
elif max_iterations is None:
if self._dynamic:
return True
else:
return False
return True
if not self._dynamic:
return False
return False |
Limit to framerate should be called after rendering has completed | def _frame_limit(self, start_time):
"""
Limit to framerate, should be called after
rendering has completed
:param start_time: When execution started
"""
if self._speed:
completion_time = time()
exc_time = completion_time - start_time
sleep_for = (1.0 / abs(self._speed)) - exc_time
if sleep_for > 0:
sleep(sleep_for) |
Run single frame of the bot | def _run_frame(self, executor, limit=False, iteration=0):
""" Run single frame of the bot
:param source_or_code: path to code to run, or actual code.
:param limit: Time a frame should take to run (float - seconds)
"""
#
# Gets a bit complex here...
#
# Nodebox (which we are trying to be compatible with) supports two
# kinds of bot 'dynamic' which has a 'draw' function and non dynamic
# which doesn't have one.
#
# Dynamic bots:
#
# First run:
# run body and 'setup' if it exists, then 'draw'
#
# Later runs:
# run 'draw'
#
# Non Dynamic bots:
#
# Just have a 'body' and run once...
#
# UNLESS... a 'var' is changed, then run it again.
#
#
# Livecoding:
#
# Code can be 'known_good' or 'tenous' (when it has been edited).
#
# If code is tenous and an exception occurs, attempt to roll
# everything back.
#
# Livecoding and vars
#
# If vars are added / removed or renamed then attempt to update
# the GUI
start_time = time()
if iteration != 0 and self._speed != 0:
self._canvas.reset_canvas()
self._set_dynamic_vars()
if iteration == 0:
# First frame
executor.run()
# run setup and draw
# (assume user hasn't live edited already)
executor.ns['setup']()
executor.ns['draw']()
self._canvas.flush(self._frame)
else:
# Subsequent frames
if self._dynamic:
if self._speed != 0: # speed 0 is paused, so do nothing
with executor.run_context() as (known_good, source, ns):
# Code in main block may redefine 'draw'
if not known_good:
executor.reload_functions()
with VarListener.batch(self._vars, self._oldvars, ns):
self._oldvars.clear()
# Re-run the function body - ideally this would only
# happen if the body had actually changed
# - Or perhaps if the line included a variable declaration
exec source in ns
ns['draw']()
self._canvas.flush(self._frame)
else:
# Non "dynamic" bots
#
# TODO - This part is overly complex, before live-coding it
# was just exec source in ns ... have to see if it
# can be simplified again.
#
with executor.run_context() as (known_good, source, ns):
if not known_good:
executor.reload_functions()
with VarListener.batch(self._vars, self._oldvars, ns):
self._oldvars.clear()
# Re-run the function body - ideally this would only
# happen if the body had actually changed
# - Or perhaps if the line included a variable declaration
exec source in ns
else:
exec source in ns
self._canvas.flush(self._frame)
if limit:
self._frame_limit(start_time)
# Can set speed to go backwards using the shell if you really want
# or pause by setting speed == 0
if self._speed > 0:
self._frame += 1
elif self._speed < 0:
self._frame -= 1 |
Executes the contents of a Nodebox/ Shoebot script in current surface s context. | def run(self, inputcode, iterations=None, run_forever=False, frame_limiter=False, verbose=False,
break_on_error=False):
'''
Executes the contents of a Nodebox/Shoebot script
in current surface's context.
:param inputcode: Path to shoebot source or string containing source
:param iterations: None or Maximum amount of frames to run
:param run_forever: If True then run until user quits the bot
:param frame_limiter: If True then sleep between frames to respect speed() command.
'''
source = None
filename = None
if os.path.isfile(inputcode):
source = open(inputcode).read()
filename = inputcode
elif isinstance(inputcode, basestring):
filename = 'shoebot_code'
source = inputcode
self._load_namespace(self._namespace, filename)
self._executor = executor = LiveExecution(source, ns=self._namespace, filename=filename)
try:
if not iterations:
if run_forever:
iterations = None
else:
iterations = 1
iteration = 0
event = None
while iteration != iterations and not event_is(event, QUIT_EVENT):
# do the magic
# First iteration
self._run_frame(executor, limit=frame_limiter, iteration=iteration)
if iteration == 0:
self._initial_namespace = copy.copy(self._namespace) # Stored so script can be rewound
iteration += 1
# Subsequent iterations
while self._should_run(iteration, iterations) and event is None:
iteration += 1
self._run_frame(executor, limit=frame_limiter, iteration=iteration)
event = next_event()
if not event:
self._canvas.sink.main_iteration() # update GUI, may generate events..
while run_forever:
#
# Running in GUI, bot has finished
# Either -
# receive quit event and quit
# receive any other event and loop (e.g. if var changed or source edited)
#
while event is None:
self._canvas.sink.main_iteration()
event = next_event(block=True, timeout=0.05)
if not event:
self._canvas.sink.main_iteration() # update GUI, may generate events..
if event.type == QUIT_EVENT:
break
elif event.type == SOURCE_CHANGED_EVENT:
# Debounce SOURCE_CHANGED events -
# gedit generates two events for changing a single character -
# delete and then add
while event and event.type == SOURCE_CHANGED_EVENT:
event = next_event(block=True, timeout=0.001)
elif event.type == SET_WINDOW_TITLE:
self._canvas.sink.set_title(event.data)
event = None # this loop is a bit weird...
break
except Exception as e:
# this makes KeyboardInterrupts still work
# if something goes wrong, print verbose system output
# maybe this is too verbose, but okay for now
import sys
if verbose:
errmsg = traceback.format_exc()
else:
errmsg = simple_traceback(e, executor.known_good or '')
print >> sys.stderr, errmsg
if break_on_error:
raise |
Sets a new accessible variable. | def _addvar(self, v):
''' Sets a new accessible variable.
:param v: Variable.
'''
oldvar = self._oldvars.get(v.name)
if oldvar is not None:
if isinstance(oldvar, Variable):
if oldvar.compliesTo(v):
v.value = oldvar.value
else:
# Set from commandline
v.value = v.sanitize(oldvar)
else:
for listener in VarListener.listeners:
listener.var_added(v)
self._vars[v.name] = v
self._namespace[v.name] = v.value
self._oldvars[v.name] = v
return v |
Receives a colour definition and returns a ( r g b a ) tuple. | def parse_color(v, color_range=1):
'''Receives a colour definition and returns a (r,g,b,a) tuple.
Accepts:
- v
- (v)
- (v,a)
- (r,g,b)
- (r,g,b,a)
- #RRGGBB
- RRGGBB
- #RRGGBBAA
- RRGGBBAA
Returns a (red, green, blue, alpha) tuple, with values ranging from
0 to 1.
The 'color_range' parameter sets the colour range in which the
colour data values are specified (except in hexstrings).
'''
# unpack one-element tuples, they show up sometimes
while isinstance(v, (tuple, list)) and len(v) == 1:
v = v[0]
if isinstance(v, (int, float)):
red = green = blue = v / color_range
alpha = 1.
elif isinstance(v, data.Color):
red, green, blue, alpha = v
elif isinstance(v, (tuple, list)):
# normalise values according to the supplied colour range
# for this we make a list with the normalised data
color = []
for index in range(0, len(v)):
color.append(v[index] / color_range)
if len(color) == 1:
red = green = blue = alpha = color[0]
elif len(color) == 2:
red = green = blue = color[0]
alpha = color[1]
elif len(color) == 3:
red = color[0]
green = color[1]
blue = color[2]
alpha = 1.
elif len(color) == 4:
red = color[0]
green = color[1]
blue = color[2]
alpha = color[3]
elif isinstance(v, basestring):
# got a hexstring: first remove hash character, if any
v = v.strip('#')
if len(data) == 6:
# RRGGBB
red = hex2dec(v[0:2]) / 255.
green = hex2dec(v[2:4]) / 255.
blue = hex2dec(v[4:6]) / 255.
alpha = 1.
elif len(v) == 8:
red = hex2dec(v[0:2]) / 255.
green = hex2dec(v[2:4]) / 255.
blue = hex2dec(v[4:6]) / 255.
alpha = hex2dec(v[6:8]) / 255.
return red, green, blue, alpha |
Returns RGB values for a hex color string. | def hex_to_rgb(hex):
""" Returns RGB values for a hex color string.
"""
hex = hex.lstrip("#")
if len(hex) < 6:
hex += hex[-1] * (6 - len(hex))
if len(hex) == 6:
r, g, b = hex[0:2], hex[2:4], hex[4:]
r, g, b = [int(n, 16) / 255.0 for n in (r, g, b)]
a = 1.0
elif len(hex) == 8:
r, g, b, a = hex[0:2], hex[2:4], hex[4:6], hex[6:]
r, g, b, a = [int(n, 16) / 255.0 for n in (r, g, b, a)]
return r, g, b, a |
Cyan magenta yellow black to red green blue. ReportLab http:// www. koders. com/ python/ fid5C006F554616848C01AC7CB96C21426B69D2E5A9. aspx Results will differ from the way NSColor converts color spaces. | def cmyk_to_rgb(c, m, y, k):
""" Cyan, magenta, yellow, black to red, green, blue.
ReportLab, http://www.koders.com/python/fid5C006F554616848C01AC7CB96C21426B69D2E5A9.aspx
Results will differ from the way NSColor converts color spaces.
"""
r = 1.0 - min(1.0, c + k)
g = 1.0 - min(1.0, m + k)
b = 1.0 - min(1.0, y + k)
return r, g, b |
Hue saturation brightness to red green blue. http:// www. koders. com/ python/ fidB2FE963F658FE74D9BF74EB93EFD44DCAE45E10E. aspx Results will differ from the way NSColor converts color spaces. | def hsv_to_rgb(h, s, v):
""" Hue, saturation, brightness to red, green, blue.
http://www.koders.com/python/fidB2FE963F658FE74D9BF74EB93EFD44DCAE45E10E.aspx
Results will differ from the way NSColor converts color spaces.
"""
if s == 0: return v, v, v
h = h / (60.0 / 360)
i = floor(h)
f = h - i
p = v * (1 - s)
q = v * (1 - s * f)
t = v * (1 - s * (1 - f))
if i == 0:
r, g, b = v, t, p
elif i == 1:
r, g, b = q, v, p
elif i == 2:
r, g, b = p, v, t
elif i == 3:
r, g, b = p, q, v
elif i == 4:
r, g, b = t, p, v
else:
r, g, b = v, p, q
return r, g, b |
Format traceback showing line number and surrounding source. | def simple_traceback(ex, source):
"""
Format traceback, showing line number and surrounding source.
"""
exc_type, exc_value, exc_tb = sys.exc_info()
exc = traceback.format_exception(exc_type, exc_value, exc_tb)
source_arr = source.splitlines()
# Defaults...
exc_location = exc[-2]
for i, err in enumerate(exc):
if 'exec source in ns' in err:
exc_location = exc[i + 1]
break
# extract line number from traceback
fn = exc_location.split(',')[0][8:-1]
line_number = int(exc_location.split(',')[1].replace('line', '').strip())
# Build error messages
err_msgs = []
# code around the error
err_where = ' '.join(exc[i - 1].split(',')[1:]).strip() # 'line 37 in blah"
err_msgs.append('Error in the Shoebot script at %s:' % err_where)
for i in xrange(max(0, line_number - 5), line_number):
if fn == "<string>":
line = source_arr[i]
else:
line = linecache.getline(fn, i + 1)
err_msgs.append('%s: %s' % (i + 1, line.rstrip()))
err_msgs.append(' %s^ %s' % (len(str(i)) * ' ', exc[-1].rstrip()))
err_msgs.append('')
# traceback
err_msgs.append(exc[0].rstrip())
for err in exc[3:]:
err_msgs.append(err.rstrip())
return '\n'.join(err_msgs) |
Generic database. Opens the SQLite database with the given name. The. db extension is automatically appended to the name. For each table in the database an attribute is created and assigned a Table object. You can do: database. table or database [ table ]. | def connect(self, name):
"""Generic database.
Opens the SQLite database with the given name.
The .db extension is automatically appended to the name.
For each table in the database an attribute is created,
and assigned a Table object.
You can do: database.table or database[table].
"""
self._name = name.rstrip(".db")
self._con = sqlite.connect(self._name + ".db")
self._cur = self._con.cursor()
self._tables = []
self._cur.execute("select name from sqlite_master where type='table'")
for r in self._cur: self._tables.append(r[0])
self._indices = []
self._cur.execute("select name from sqlite_master where type='index'")
for r in self._cur: self._indices.append(r[0])
for t in self._tables:
self._cur.execute("pragma table_info("+t+")")
fields = []
key = ""
for r in self._cur:
fields.append(r[1])
if r[2] == "integer": key = r[1]
setattr(self, t, Table(self, t, key, fields)) |
Creates an SQLite database file. Creates an SQLite database with the given name. The. box file extension is added automatically. Overwrites any existing database by default. | def create(self, name, overwrite=True):
"""Creates an SQLite database file.
Creates an SQLite database with the given name.
The .box file extension is added automatically.
Overwrites any existing database by default.
"""
self._name = name.rstrip(".db")
from os import unlink
if overwrite:
try: unlink(self._name + ".db")
except: pass
self._con = sqlite.connect(self._name + ".db")
self._cur = self._con.cursor() |
Creates a new table. Creates a table with the given name containing the list of given fields. Since SQLite uses manifest typing no data type need be supplied. The primary key is id by default an integer that can be set or otherwise autoincrements. | def create_table(self, name, fields=[], key="id"):
"""Creates a new table.
Creates a table with the given name,
containing the list of given fields.
Since SQLite uses manifest typing, no data type need be supplied.
The primary key is "id" by default,
an integer that can be set or otherwise autoincrements.
"""
for f in fields:
if f == key: fields.remove(key)
sql = "create table "+name+" "
sql += "("+key+" integer primary key"
for f in fields: sql += ", "+f+" varchar(255)"
sql += ")"
self._cur.execute(sql)
self._con.commit()
self.index(name, key, unique=True)
self.connect(self._name) |
Creates a table index. Creates an index on the given table on the given field with unique values enforced or not in ascending or descending order. | def create_index(self, table, field, unique=False, ascending=True):
"""Creates a table index.
Creates an index on the given table,
on the given field with unique values enforced or not,
in ascending or descending order.
"""
if unique: u = "unique "
else: u = ""
if ascending: a = "asc"
else: a = "desc"
sql = "create "+u+"index index_"+table+"_"+field+" "
sql += "on "+table+"("+field+" "+a+")"
self._cur.execute(sql)
self._con.commit() |
Commits any pending transactions and closes the database. | def close(self):
"""Commits any pending transactions and closes the database.
"""
self._con.commit()
self._cur.close()
self._con.close() |
Executes a raw SQL statement on the database. | def sql(self, sql):
""" Executes a raw SQL statement on the database.
"""
self._cur.execute(sql)
if sql.lower().find("select") >= 0:
matches = []
for r in self._cur: matches.append(r)
return matches |
A simple SQL SELECT query. Retrieves all rows from the table where the given query value is found in the given column ( primary key if None ). A different comparison operator ( e. g. > < like ) can be set. The wildcard character is * and automatically sets the operator to like. Optionally the fields argument can be a list of column names to select. Returns a list of row tuples containing fields. | def find(self, q, operator="=", fields="*", key=None):
"""A simple SQL SELECT query.
Retrieves all rows from the table
where the given query value is found in the given column (primary key if None).
A different comparison operator (e.g. >, <, like) can be set.
The wildcard character is * and automatically sets the operator to "like".
Optionally, the fields argument can be a list of column names to select.
Returns a list of row tuples containing fields.
"""
if key == None: key = self._key
if fields != "*": fields = ", ".join(fields)
try: q = unicode(q)
except: pass
if q != "*" and (q[0] == "*" or q[-1] == "*"):
if q[0] == "*": q = "%"+q.lstrip("*")
if q[-1] == "*": q = q.rstrip("*")+"%"
operator = "like"
if q != "*":
sql = "select "+fields+" from "+self._name+" where "+key+" "+operator+" ?"
self._db._cur.execute(sql, (q,))
else:
sql = "select "+fields+" from "+self._name
self._db._cur.execute(sql)
# You need to watch out here when bad unicode data
# has entered the database: pysqlite will throw an OperationalError.
# http://lists.initd.org/pipermail/pysqlite/2006-April/000488.html
matches = []
for r in self._db._cur: matches.append(r)
return matches |
Adds a new row to a table. Adds a row to the given table. The column names and their corresponding values must either be supplied as a dictionary of { fields: values } or a series of keyword arguments of field = value style. | def append(self, *args, **kw):
"""Adds a new row to a table.
Adds a row to the given table.
The column names and their corresponding values
must either be supplied as a dictionary of {fields:values},
or a series of keyword arguments of field=value style.
"""
if args and kw:
return
if args and type(args[0]) == dict:
fields = [k for k in args[0]]
v = [args[0][k] for k in args[0]]
if kw:
fields = [k for k in kw]
v = [kw[k] for k in kw]
q = ", ".join(["?" for x in fields])
sql = "insert into "+self._name+" ("+", ".join(fields)+") "
sql += "values ("+q+")"
self._db._cur.execute(sql, v)
self._db._i += 1
if self._db._i >= self._db._commit:
self._db._i = 0
self._db._con.commit() |
Edits the row with given id. | def edit(self, id, *args, **kw):
""" Edits the row with given id.
"""
if args and kw:
return
if args and type(args[0]) == dict:
fields = [k for k in args[0]]
v = [args[0][k] for k in args[0]]
if kw:
fields = [k for k in kw]
v = [kw[k] for k in kw]
sql = "update "+self._name+" set "+"=?, ".join(fields)+"=? where "+self._key+"="+unicode(id)
self._db._cur.execute(sql, v)
self._db._i += 1
if self._db._i >= self._db._commit:
self._db._i = 0
self._db._con.commit() |
Deletes the row with given id. | def remove(self, id, operator="=", key=None):
""" Deletes the row with given id.
"""
if key == None: key = self._key
try: id = unicode(id)
except: pass
sql = "delete from "+self._name+" where "+key+" "+operator+" ?"
self._db._cur.execute(sql, (id,)) |
Get the next available event or None | def next_event(block=False, timeout=None):
"""
Get the next available event or None
:param block:
:param timeout:
:return: None or (event, data)
"""
try:
return channel.listen(block=block, timeout=timeout).next()['data']
except StopIteration:
return None |
Publish an event ot any subscribers. | def publish_event(event_t, data=None, extra_channels=None, wait=None):
"""
Publish an event ot any subscribers.
:param event_t: event type
:param data: event data
:param extra_channels:
:param wait:
:return:
"""
event = Event(event_t, data)
pubsub.publish("shoebot", event)
for channel_name in extra_channels or []:
pubsub.publish(channel_name, event)
if wait is not None:
channel = pubsub.subscribe(wait)
channel.listen(wait) |
Sets call_transform_mode to point to the center_transform or corner_transform | def _set_mode(self, mode):
'''
Sets call_transform_mode to point to the
center_transform or corner_transform
'''
if mode == CENTER:
self._call_transform_mode = self._center_transform
elif mode == CORNER:
self._call_transform_mode = self._corner_transform
else:
raise ValueError('mode must be CENTER or CORNER') |
Works like setupTransform of a version of java nodebox http:// dev. nodebox. net/ browser/ nodebox - java/ branches/ rewrite/ src/ java/ net/ nodebox/ graphics/ Grob. java | def _center_transform(self, transform):
''''
Works like setupTransform of a version of java nodebox
http://dev.nodebox.net/browser/nodebox-java/branches/rewrite/src/java/net/nodebox/graphics/Grob.java
'''
dx, dy = self._get_center()
t = cairo.Matrix()
t.translate(dx, dy)
t = transform * t
t.translate(-dx, -dy)
return t |
Doesn t store exactly the same items as Nodebox for ease of implementation it has enough to get the Nodebox Dentrite example working. | def inheritFromContext(self, ignore=()):
"""
Doesn't store exactly the same items as Nodebox for ease of implementation,
it has enough to get the Nodebox Dentrite example working.
"""
for canvas_attr, grob_attr in STATES.items():
if canvas_attr in ignore:
continue
setattr(self, grob_attr, getattr(self._bot._canvas, canvas_attr)) |
Load changed code into the execution environment. | def load_edited_source(self, source, good_cb=None, bad_cb=None, filename=None):
"""
Load changed code into the execution environment.
Until the code is executed correctly, it will be
in the 'tenuous' state.
"""
with LiveExecution.lock:
self.good_cb = good_cb
self.bad_cb = bad_cb
try:
# text compile
compile(source + '\n\n', filename or self.filename, "exec")
self.edited_source = source
except Exception as e:
if bad_cb:
self.edited_source = None
tb = traceback.format_exc()
self.call_bad_cb(tb)
return
if filename is not None:
self.filename = filename |
Replace functions in namespace with functions from edited_source. | def reload_functions(self):
"""
Replace functions in namespace with functions from edited_source.
"""
with LiveExecution.lock:
if self.edited_source:
tree = ast.parse(self.edited_source)
for f in [n for n in ast.walk(tree) if isinstance(n, ast.FunctionDef)]:
self.ns[f.name].__code__ = meta.decompiler.compile_func(f, self.filename, self.ns).__code__ |
Run edited source if no exceptions occur then it graduates to known good. | def run_tenuous(self):
"""
Run edited source, if no exceptions occur then it
graduates to known good.
"""
with LiveExecution.lock:
ns_snapshot = copy.copy(self.ns)
try:
source = self.edited_source
self.edited_source = None
self.do_exec(source, ns_snapshot)
self.known_good = source
self.call_good_cb()
return True, None
except Exception as ex:
tb = traceback.format_exc()
self.call_bad_cb(tb)
self.ns.clear()
self.ns.update(ns_snapshot)
return False, ex |
Attempt to known good or tenuous source. | def run(self):
"""
Attempt to known good or tenuous source.
"""
with LiveExecution.lock:
if self.edited_source:
success, ex = self.run_tenuous()
if success:
return
self.do_exec(self.known_good, self.ns) |
If bad_cb returns True then keep it: param tb: traceback that caused exception: return: | def call_bad_cb(self, tb):
"""
If bad_cb returns True then keep it
:param tb: traceback that caused exception
:return:
"""
with LiveExecution.lock:
if self.bad_cb and not self.bad_cb(tb):
self.bad_cb = None |
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