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def width_max(self, width_max):
"""Set the maximum width of the widget. Parameters width_max: None | float the maximum width of the widget. if None, maximum widt... |
if width_max is None:
self._width_limits[1] = None
return
width_max = float(width_max)
assert(self.width_min <= width_max)
self._width_limits[1] = width_max
self._update_layout() |
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def height_max(self, height_max):
"""Set the maximum height of the widget. Parameters height_max: None | float the maximum height of the widget. if None, maximum... |
if height_max is None:
self._height_limits[1] = None
return
height_max = float(height_max)
assert(0 <= self.height_min <= height_max)
self._height_limits[1] = height_max
self._update_layout() |
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def inner_rect(self):
"""The rectangular area inside the margin, border, and padding. Generally widgets should avoid drawing or placing sub-widgets outside this ... |
m = self.margin + self._border_width + self.padding
if not self.border_color.is_blank:
m += 1
return Rect((m, m), (self.size[0]-2*m, self.size[1]-2*m)) |
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def _update_clipper(self):
"""Called whenever the clipper for this widget may need to be updated. """ |
if self.clip_children and self._clipper is None:
self._clipper = Clipper()
elif not self.clip_children:
self._clipper = None
if self._clipper is None:
return
self._clipper.rect = self.inner_rect
self._clipper.transform = self.get_transform('f... |
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def _update_line(self):
""" Update border line to match new shape """ |
w = self._border_width
m = self.margin
# border is drawn within the boundaries of the widget:
#
# size = (8, 7) margin=2
# internal rect = (3, 3, 2, 1)
# ........
# ........
# ..BBBB..
# ..B B..
# ..BBBB..
# ........ |
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def add_widget(self, widget):
""" Add a Widget as a managed child of this Widget. The child will be automatically positioned and sized to fill the entire space i... |
self._widgets.append(widget)
widget.parent = self
self._update_child_widgets()
return widget |
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def remove_widget(self, widget):
""" Remove a Widget as a managed child of this Widget. Parameters widget : instance of Widget The widget to remove. """ |
self._widgets.remove(widget)
widget.parent = None
self._update_child_widgets() |
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def pack_ieee(value):
"""Packs float ieee binary representation into 4 unsigned int8 Returns ------- pack: array packed interpolation kernel """ |
return np.fromstring(value.tostring(),
np.ubyte).reshape((value.shape + (4,))) |
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def load_spatial_filters(packed=True):
"""Load spatial-filters kernel Parameters packed : bool Whether or not the data should be in "packed" representation for u... |
names = ("Bilinear", "Hanning", "Hamming", "Hermite",
"Kaiser", "Quadric", "Bicubic", "CatRom",
"Mitchell", "Spline16", "Spline36", "Gaussian",
"Bessel", "Sinc", "Lanczos", "Blackman", "Nearest")
kernel = np.load(op.join(DATA_DIR, 'spatial-filters.npy'))
if packed:
... |
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def timeout(limit, handler):
"""A decorator ensuring that the decorated function tun time does not exceeds the argument limit. :args limit: the time limit :type ... |
def wrapper(f):
def wrapped_f(*args, **kwargs):
old_handler = signal.getsignal(signal.SIGALRM)
signal.signal(signal.SIGALRM, timeout_handler)
signal.alarm(limit)
try:
res = f(*args, **kwargs)
except Timeout:
handler... |
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def _process_backend_kwargs(self, kwargs):
""" Simple utility to retrieve kwargs in predetermined order. Also checks whether the values of the backend arguments ... |
# Verify given argument with capability of the backend
app = self._vispy_canvas.app
capability = app.backend_module.capability
if kwargs['context'].shared.name: # name already assigned: shared
if not capability['context']:
raise RuntimeError('Cannot share co... |
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def viewbox_key_event(self, event):
"""ViewBox key event handler Parameters event : instance of Event The event. """ |
PerspectiveCamera.viewbox_key_event(self, event)
if event.handled or not self.interactive:
return
# Ensure the timer runs
if not self._timer.running:
self._timer.start()
if event.key in self._keymap:
val_dims = self._keymap[event.key]
... |
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def set_inputhook(self, callback):
"""Set PyOS_InputHook to callback and return the previous one.""" |
# On platforms with 'readline' support, it's all too likely to
# have a KeyboardInterrupt signal delivered *even before* an
# initial ``try:`` clause in the callback can be executed, so
# we need to disable CTRL+C in this situation.
ignore_CTRL_C()
self._callback = callb... |
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def clear_inputhook(self, app=None):
"""Set PyOS_InputHook to NULL and return the previous one. Parameters app : optional, ignored This parameter is allowed only... |
pyos_inputhook_ptr = self.get_pyos_inputhook()
original = self.get_pyos_inputhook_as_func()
pyos_inputhook_ptr.value = ctypes.c_void_p(None).value
allow_CTRL_C()
self._reset()
return original |
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def set_current_canvas(canvas):
""" Make a canvas active. Used primarily by the canvas itself. """ |
# Notify glir
canvas.context._do_CURRENT_command = True
# Try to be quick
if canvasses and canvasses[-1]() is canvas:
return
# Make this the current
cc = [c() for c in canvasses if c() is not None]
while canvas in cc:
cc.remove(canvas)
cc.append(canvas)
canvasses[:]... |
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def forget_canvas(canvas):
""" Forget about the given canvas. Used by the canvas when closed. """ |
cc = [c() for c in canvasses if c() is not None]
while canvas in cc:
cc.remove(canvas)
canvasses[:] = [weakref.ref(c) for c in cc] |
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def create_shared(self, name, ref):
""" For the app backends to create the GLShared object. Parameters name : str The name. ref : object The reference. """ |
if self._shared is not None:
raise RuntimeError('Can only set_shared once.')
self._shared = GLShared(name, ref) |
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def add_ref(self, name, ref):
""" Add a reference for the backend object that gives access to the low level context. Used in vispy.app.canvas.backends. The given... |
if self._name is None:
self._name = name
elif name != self._name:
raise RuntimeError('Contexts can only share between backends of '
'the same type')
self._refs.append(weakref.ref(ref)) |
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def obj(x):
"""Two Dimensional Shubert Function""" |
j = np.arange(1, 6)
tmp1 = np.dot(j, np.cos((j+1)*x[0] + j))
tmp2 = np.dot(j, np.cos((j+1)*x[1] + j))
return tmp1 * tmp2 |
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def copy(self):
""" Create an exact copy of this quaternion. """ |
return Quaternion(self.w, self.x, self.y, self.z, False) |
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def _normalize(self):
""" Make the quaternion unit length. """ |
# Get length
L = self.norm()
if not L:
raise ValueError('Quaternion cannot have 0-length.')
# Correct
self.w /= L
self.x /= L
self.y /= L
self.z /= L |
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def rotate_point(self, p):
""" Rotate a Point instance using this quaternion. """ |
# Prepare
p = Quaternion(0, p[0], p[1], p[2], False) # Do not normalize!
q1 = self.normalize()
q2 = self.inverse()
# Apply rotation
r = (q1*p)*q2
# Make point and return
return r.x, r.y, r.z |
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def get_matrix(self):
""" Create a 4x4 homography matrix that represents the rotation of the quaternion. """ |
# Init matrix (remember, a matrix, not an array)
a = np.zeros((4, 4), dtype=np.float32)
w, x, y, z = self.w, self.x, self.y, self.z
# First row
a[0, 0] = - 2.0 * (y * y + z * z) + 1.0
a[1, 0] = + 2.0 * (x * y + z * w)
a[2, 0] = + 2.0 * (x * z - y * w)
a[3... |
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def create_from_euler_angles(cls, rx, ry, rz, degrees=False):
""" Classmethod to create a quaternion given the euler angles. """ |
if degrees:
rx, ry, rz = np.radians([rx, ry, rz])
# Obtain quaternions
qx = Quaternion(np.cos(rx/2), 0, 0, np.sin(rx/2))
qy = Quaternion(np.cos(ry/2), 0, np.sin(ry/2), 0)
qz = Quaternion(np.cos(rz/2), np.sin(rz/2), 0, 0)
# Almost done
return qx*qy*qz |
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def as_enum(enum):
""" Turn a possibly string enum into an integer enum. """ |
if isinstance(enum, string_types):
try:
enum = getattr(gl, 'GL_' + enum.upper())
except AttributeError:
try:
enum = _internalformats['GL_' + enum.upper()]
except KeyError:
raise ValueError('Could not find int value for enum %r' % e... |
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def convert_shaders(convert, shaders):
""" Modify shading code so that we can write code once and make it run "everywhere". """ |
# New version of the shaders
out = []
if convert == 'es2':
for isfragment, shader in enumerate(shaders):
has_version = False
has_prec_float = False
has_prec_int = False
lines = []
# Iterate over lines
for line in shader.lstr... |
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def as_es2_command(command):
""" Modify a desktop command so it works on es2. """ |
if command[0] == 'FUNC':
return (command[0], re.sub(r'^gl([A-Z])',
lambda m: m.group(1).lower(), command[1])) + command[2:]
if command[0] == 'SHADERS':
return command[:2] + convert_shaders('es2', command[2:])
if command[0] == 'UNIFORM':
return command[:-1] + (comman... |
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def show(self, filter=None):
""" Print the list of commands currently in the queue. If filter is given, print only commands that match the filter. """ |
for command in self._commands:
if command[0] is None: # or command[1] in self._invalid_objects:
continue # Skip nill commands
if filter and command[0] != filter:
continue
t = []
for e in command:
if isinstance(e, ... |
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def flush(self, parser):
""" Flush all current commands to the GLIR interpreter. """ |
if self._verbose:
show = self._verbose if isinstance(self._verbose, str) else None
self.show(show)
parser.parse(self._filter(self.clear(), parser)) |
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def associate(self, queue):
"""Merge this queue with another. Both queues will use a shared command list and either one can be used to fill or flush the shared q... |
assert isinstance(queue, GlirQueue)
if queue._shared is self._shared:
return
# merge commands
self._shared._commands.extend(queue.clear())
self._shared._verbose |= queue._shared._verbose
self._shared._associations[queue] = None
# update queue and all... |
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def _parse(self, command):
""" Parse a single command. """ |
cmd, id_, args = command[0], command[1], command[2:]
if cmd == 'CURRENT':
# This context is made current
self.env.clear()
self._gl_initialize()
self.env['fbo'] = args[0]
gl.glBindFramebuffer(gl.GL_FRAMEBUFFER, args[0])
elif cmd == 'FU... |
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def parse(self, commands):
""" Parse a list of commands. """ |
# Get rid of dummy objects that represented deleted objects in
# the last parsing round.
to_delete = []
for id_, val in self._objects.items():
if val == JUST_DELETED:
to_delete.append(id_)
for id_ in to_delete:
self._objects.pop(id_)
... |
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def _gl_initialize(self):
""" Deal with compatibility; desktop does not have sprites enabled by default. ES has. """ |
if '.es' in gl.current_backend.__name__:
pass # ES2: no action required
else:
# Desktop, enable sprites
GL_VERTEX_PROGRAM_POINT_SIZE = 34370
GL_POINT_SPRITE = 34913
gl.glEnable(GL_VERTEX_PROGRAM_POINT_SIZE)
gl.glEnable(GL_POINT_SP... |
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def set_shaders(self, vert, frag):
""" This function takes care of setting the shading code and compiling+linking it into a working program object that is ready ... |
self._linked = False
# Create temporary shader objects
vert_handle = gl.glCreateShader(gl.GL_VERTEX_SHADER)
frag_handle = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
# For both vertex and fragment shader: set source, compile, check
for code, handle, type_ in [(vert, vert_ha... |
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def _parse_error(self, error):
""" Parses a single GLSL error and extracts the linenr and description Other GLIR implementations may omit this. """ |
error = str(error)
# Nvidia
# 0(7): error C1008: undefined variable "MV"
m = re.match(r'(\d+)\((\d+)\)\s*:\s(.*)', error)
if m:
return int(m.group(2)), m.group(3)
# ATI / Intel
# ERROR: 0:131: '{' : syntax error parse error
m = re.match(r'ERRO... |
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def _get_error(self, code, errors, indentation=0):
"""Get error and show the faulty line + some context Other GLIR implementations may omit this. """ |
# Init
results = []
lines = None
if code is not None:
lines = [line.strip() for line in code.split('\n')]
for error in errors.split('\n'):
# Strip; skip empy lines
error = error.strip()
if not error:
continue
... |
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def set_texture(self, name, value):
""" Set a texture sampler. Value is the id of the texture to link. """ |
if not self._linked:
raise RuntimeError('Cannot set uniform when program has no code')
# Get handle for the uniform, first try cache
handle = self._handles.get(name, -1)
if handle < 0:
if name in self._known_invalid:
return
handle = gl... |
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def set_uniform(self, name, type_, value):
""" Set a uniform value. Value is assumed to have been checked. """ |
if not self._linked:
raise RuntimeError('Cannot set uniform when program has no code')
# Get handle for the uniform, first try cache
handle = self._handles.get(name, -1)
count = 1
if handle < 0:
if name in self._known_invalid:
return
... |
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def set_attribute(self, name, type_, value):
""" Set an attribute value. Value is assumed to have been checked. """ |
if not self._linked:
raise RuntimeError('Cannot set attribute when program has no code')
# Get handle for the attribute, first try cache
handle = self._handles.get(name, -1)
if handle < 0:
if name in self._known_invalid:
return
handle ... |
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def as_matrix_transform(transform):
""" Simplify a transform to a single matrix transform, which makes it a lot faster to compute transformations. Raises a TypeE... |
if isinstance(transform, ChainTransform):
matrix = np.identity(4)
for tr in transform.transforms:
# We need to do the matrix multiplication manually because VisPy
# somehow doesn't mutliply matrices if there is a perspective
# component. The equation below looks ... |
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def circular(adjacency_mat, directed=False):
"""Places all nodes on a single circle. Parameters adjacency_mat : matrix or sparse The graph adjacency matrix direc... |
if issparse(adjacency_mat):
adjacency_mat = adjacency_mat.tocoo()
num_nodes = adjacency_mat.shape[0]
t = np.linspace(0, 2 * np.pi, num_nodes, endpoint=False, dtype=np.float32)
# Visual coordinate system is between 0 and 1, so generate a circle with
# radius 0.5 and center it at the poin... |
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def set_data(self, pos=None, symbol='o', size=10., edge_width=1., edge_width_rel=None, edge_color='black', face_color='white', scaling=False):
""" Set the data u... |
assert (isinstance(pos, np.ndarray) and
pos.ndim == 2 and pos.shape[1] in (2, 3))
if (edge_width is not None) + (edge_width_rel is not None) != 1:
raise ValueError('exactly one of edge_width and edge_width_rel '
'must be non-None')
if edg... |
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def hook_changed(self, hook_name, widget, new_data):
"""Handle a hook upate.""" |
if hook_name == 'song':
self.song_changed(widget, new_data)
elif hook_name == 'state':
self.state_changed(widget, new_data)
elif hook_name == 'elapsed_and_total':
elapsed, total = new_data
self.time_changed(widget, elapsed, total) |
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| def update(self, func, **kw):
"Update the signature of func with the data in self"
func.__name__ = self.name
func.__doc__ = getattr(self, 'doc', None)
func.__dict__ = getattr(self, 'dict', {})
func.__defaults__ = getattr(self, 'defaults', ())
func.__kwdefaults__ = getattr... |
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| def make(self, src_templ, evaldict=None, addsource=False, **attrs):
"Make a new function from a given template and update the signature"
src = src_templ % vars(self) # expand name and signature
evaldict = evaldict or {}
mo = DEF.match(src)
if mo is None:
raise SyntaxE... |
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def get_scene_bounds(self, dim=None):
"""Get the total bounds based on the visuals present in the scene Parameters dim : int | None Dimension to return. Returns ... |
# todo: handle sub-children
# todo: handle transformations
# Init
bounds = [(np.inf, -np.inf), (np.inf, -np.inf), (np.inf, -np.inf)]
# Get bounds of all children
for ob in self.scene.children:
if hasattr(ob, 'bounds'):
for axis in (0, 1, 2):
... |
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def _array_clip_val(val):
"""Helper to turn val into array and clip between 0 and 1""" |
val = np.array(val)
if val.max() > 1 or val.min() < 0:
logger.warning('value will be clipped between 0 and 1')
val[...] = np.clip(val, 0, 1)
return val |
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def extend(self, colors):
"""Extend a ColorArray with new colors Parameters colors : instance of ColorArray The new colors. """ |
colors = ColorArray(colors)
self._rgba = np.vstack((self._rgba, colors._rgba))
return self |
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def rgba(self, val):
"""Set the color using an Nx4 array of RGBA floats""" |
# Note: all other attribute sets get routed here!
# This method is meant to do the heavy lifting of setting data
rgba = _user_to_rgba(val, expand=False)
if self._rgba is None:
self._rgba = rgba # only on init
else:
self._rgba[:, :rgba.shape[1]] = rgba |
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Description:
def RGBA(self, val):
"""Set the color using an Nx4 array of RGBA uint8 values""" |
# need to convert to normalized float
val = np.atleast_1d(val).astype(np.float32) / 255
self.rgba = val |
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def RGB(self, val):
"""Set the color using an Nx3 array of RGB uint8 values""" |
# need to convert to normalized float
val = np.atleast_1d(val).astype(np.float32) / 255.
self.rgba = val |
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Description:
def viewbox_mouse_event(self, event):
""" The ViewBox received a mouse event; update transform accordingly. Default implementation adjusts scale factor when scol... |
BaseCamera.viewbox_mouse_event(self, event)
if event.type == 'mouse_wheel':
s = 1.1 ** - event.delta[1]
self._scale_factor *= s
if self._distance is not None:
self._distance *= s
self.view_changed() |
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def _set_range(self, init):
""" Reset the camera view using the known limits. """ |
if init and (self._scale_factor is not None):
return # We don't have to set our scale factor
# Get window size (and store factor now to sync with resizing)
w, h = self._viewbox.size
w, h = float(w), float(h)
# Get range and translation for x and y
x1, y1,... |
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def viewbox_mouse_event(self, event):
""" The viewbox received a mouse event; update transform accordingly. Parameters event : instance of Event The event. """ |
if event.handled or not self.interactive:
return
PerspectiveCamera.viewbox_mouse_event(self, event)
if event.type == 'mouse_release':
self._event_value = None # Reset
elif event.type == 'mouse_press':
event.handled = True
elif event.type ==... |
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def _update_camera_pos(self):
""" Set the camera position and orientation""" |
# transform will be updated several times; do not update camera
# transform until we are done.
ch_em = self.events.transform_change
with ch_em.blocker(self._update_transform):
tr = self.transform
tr.reset()
up, forward, right = self._get_dim_vectors... |
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def is_interactive(self):
""" Determine if the user requested interactive mode. """ |
# The Python interpreter sets sys.flags correctly, so use them!
if sys.flags.interactive:
return True
# IPython does not set sys.flags when -i is specified, so first
# check it if it is already imported.
if '__IPYTHON__' not in dir(six.moves.builtins):
r... |
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def run(self, allow_interactive=True):
""" Enter the native GUI event loop. Parameters allow_interactive : bool Is the application allowed to handle interactive ... |
if allow_interactive and self.is_interactive():
inputhook.set_interactive(enabled=True, app=self)
else:
return self._backend._vispy_run() |
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def _use(self, backend_name=None):
"""Select a backend by name. See class docstring for details. """ |
# See if we're in a specific testing mode, if so DONT check to see
# if it's a valid backend. If it isn't, it's a good thing we
# get an error later because we should have decorated our test
# with requires_application()
test_name = os.getenv('_VISPY_TESTING_APP', None)
... |
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def _get_mods(evt):
"""Helper to extract list of mods from event""" |
mods = []
mods += [keys.CONTROL] if evt.ControlDown() else []
mods += [keys.ALT] if evt.AltDown() else []
mods += [keys.SHIFT] if evt.ShiftDown() else []
mods += [keys.META] if evt.MetaDown() else []
return mods |
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def _process_key(evt):
"""Helper to convert from wx keycode to vispy keycode""" |
key = evt.GetKeyCode()
if key in KEYMAP:
return KEYMAP[key], ''
if 97 <= key <= 122:
key -= 32
if key >= 32 and key <= 127:
return keys.Key(chr(key)), chr(key)
else:
return None, None |
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def is_child(self, node):
"""Check if a node is a child of the current node Parameters node : instance of Node The potential child. Returns ------- child : bool ... |
if node in self.children:
return True
for c in self.children:
if c.is_child(node):
return True
return False |
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def scene_node(self):
"""The first ancestor of this node that is a SubScene instance, or self if no such node exists. """ |
if self._scene_node is None:
from .subscene import SubScene
p = self.parent
while True:
if isinstance(p, SubScene) or p is None:
self._scene_node = p
break
p = p.parent
if self._scene_node is... |
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def update(self):
""" Emit an event to inform listeners that properties of this Node have changed. Also request a canvas update. """ |
self.events.update()
c = getattr(self, 'canvas', None)
if c is not None:
c.update(node=self) |
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def parent_chain(self):
""" Return the list of parents starting from this node. The chain ends at the first node with no parents. """ |
chain = [self]
while True:
try:
parent = chain[-1].parent
except Exception:
break
if parent is None:
break
chain.append(parent)
return chain |
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def _describe_tree(self, prefix, with_transform):
"""Helper function to actuall construct the tree""" |
extra = ': "%s"' % self.name if self.name is not None else ''
if with_transform:
extra += (' [%s]' % self.transform.__class__.__name__)
output = ''
if len(prefix) > 0:
output += prefix[:-3]
output += ' +--'
output += '%s%s\n' % (self.__class_... |
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def common_parent(self, node):
""" Return the common parent of two entities If the entities have no common parent, return None. Parameters node : instance of Nod... |
p1 = self.parent_chain()
p2 = node.parent_chain()
for p in p1:
if p in p2:
return p
return None |
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def node_path_to_child(self, node):
"""Return a list describing the path from this node to a child node If *node* is not a (grand)child of this node, then raise ... |
if node is self:
return []
# Go up from the child node as far as we can
path1 = [node]
child = node
while child.parent is not None:
child = child.parent
path1.append(child)
# Early exit
if child is self:
... |
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def node_path(self, node):
"""Return two lists describing the path from this node to another Parameters node : instance of Node The other node. Returns ------- p... |
p1 = self.parent_chain()
p2 = node.parent_chain()
cp = None
for p in p1:
if p in p2:
cp = p
break
if cp is None:
raise RuntimeError("No single-path common parent between nodes %s "
"and %s." %... |
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def node_path_transforms(self, node):
"""Return the list of transforms along the path to another node. The transforms are listed in reverse order, such that the ... |
a, b = self.node_path(node)
return ([n.transform for n in a[:-1]] +
[n.transform.inverse for n in b])[::-1] |
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def readLine(self):
""" The method that reads a line and processes it. """ |
# Read line
line = self._f.readline().decode('ascii', 'ignore')
if not line:
raise EOFError()
line = line.strip()
if line.startswith('v '):
# self._vertices.append( *self.readTuple(line) )
self._v.append(self.readTuple(line))
elif li... |
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def finish(self):
""" Converts gathere lists to numpy arrays and creates BaseMesh instance. """ |
self._vertices = np.array(self._vertices, 'float32')
if self._faces:
self._faces = np.array(self._faces, 'uint32')
else:
# Use vertices only
self._vertices = np.array(self._v, 'float32')
self._faces = None
if self._normals:
sel... |
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def write(cls, fname, vertices, faces, normals, texcoords, name='', reshape_faces=True):
""" This classmethod is the entry point for writing mesh data to OBJ. Pa... |
# Open file
fmt = op.splitext(fname)[1].lower()
if fmt not in ('.obj', '.gz'):
raise ValueError('Filename must end with .obj or .gz, not "%s"'
% (fmt,))
opener = open if fmt == '.obj' else gzip_open
f = opener(fname, 'wb')
try:
... |
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def writeFace(self, val, what='f'):
""" Write the face info to the net line. """ |
# OBJ counts from 1
val = [v + 1 for v in val]
# Make string
if self._hasValues and self._hasNormals:
val = ' '.join(['%i/%i/%i' % (v, v, v) for v in val])
elif self._hasNormals:
val = ' '.join(['%i//%i' % (v, v) for v in val])
elif self._hasValue... |
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def writeMesh(self, vertices, faces, normals, values, name='', reshape_faces=True):
""" Write the given mesh instance. """ |
# Store properties
self._hasNormals = normals is not None
self._hasValues = values is not None
self._hasFaces = faces is not None
# Get faces and number of vertices
if faces is None:
faces = np.arange(len(vertices))
reshape_faces = True
... |
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def _fast_cross_3d(x, y):
"""Compute cross product between list of 3D vectors Much faster than np.cross() when the number of cross products becomes large (>500).... |
assert x.ndim == 2
assert y.ndim == 2
assert x.shape[1] == 3
assert y.shape[1] == 3
assert (x.shape[0] == 1 or y.shape[0] == 1) or x.shape[0] == y.shape[0]
if max([x.shape[0], y.shape[0]]) >= 500:
return np.c_[x[:, 1] * y[:, 2] - x[:, 2] * y[:, 1],
x[:, 2] * y[:, 0]... |
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def _calculate_normals(rr, tris):
"""Efficiently compute vertex normals for triangulated surface""" |
# ensure highest precision for our summation/vectorization "trick"
rr = rr.astype(np.float64)
# first, compute triangle normals
r1 = rr[tris[:, 0], :]
r2 = rr[tris[:, 1], :]
r3 = rr[tris[:, 2], :]
tri_nn = _fast_cross_3d((r2 - r1), (r3 - r1))
# Triangle normals and areas
size = n... |
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def parse(self):
"""Parse the lines, and fill self.line_fields accordingly.""" |
for line in self.lines:
# Parse the line
field_defs = self.parse_line(line)
fields = []
# Convert field parameters into Field objects
for (kind, options) in field_defs:
logger.debug("Creating field %s(%r)", kind, options)
... |
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def compute_positions(cls, screen_width, line):
"""Compute the relative position of the fields on a given line. Args: screen_width (int):
the width of the scree... |
# First index
left = 1
# Last index
right = screen_width + 1
# Current 'flexible' field
flexible = None
# Compute the space to the left and to the right of the (optional)
# flexible field.
for field in line:
if field.is_flexible():
... |
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def add_to_screen(self, screen_width, screen):
"""Add the pattern to a screen. Also fills self.widgets. Args: screen_width (int):
the width of the screen screen... |
for lineno, fields in enumerate(self.line_fields):
for left, field in self.compute_positions(screen_width, fields):
logger.debug(
"Adding field %s to screen %s at x=%d->%d, y=%d",
field, screen.ref, left, left + field.width - 1, 1 + lineno,
... |
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def register_hooks(self, field):
"""Register a field on its target hooks.""" |
for hook, subhooks in field.register_hooks():
self.hooks[hook].append(field)
self.subhooks[hook] |= set(subhooks) |
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def hook_changed(self, hook, new_data):
"""Called whenever the data for a hook changed.""" |
for field in self.hooks[hook]:
widget = self.widgets[field]
field.hook_changed(hook, widget, new_data) |
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def add(self, pattern_txt):
"""Add a pattern to the list. Args: pattern_txt (str list):
the pattern, as a list of lines. """ |
self.patterns[len(pattern_txt)] = pattern_txt
low = 0
high = len(pattern_txt) - 1
while not pattern_txt[low]:
low += 1
while not pattern_txt[high]:
high -= 1
min_pattern = pattern_txt[low:high + 1]
self.min_patterns[len(min_pattern)] =... |
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def _arcball(xy, wh):
"""Convert x,y coordinates to w,x,y,z Quaternion parameters Adapted from: linalg library Copyright (c) 2010-2015, Renaud Blanch <rndblnch a... |
x, y = xy
w, h = wh
r = (w + h) / 2.
x, y = -(2. * x - w) / r, (2. * y - h) / r
h = np.sqrt(x*x + y*y)
return (0., x/h, y/h, 0.) if h > 1. else (0., x, y, np.sqrt(1. - h*h)) |
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def arg_to_array(func):
""" Decorator to convert argument to array. Parameters func : function The function to decorate. Returns ------- func : function The deco... |
def fn(self, arg, *args, **kwargs):
"""Function
Parameters
----------
arg : array-like
Argument to convert.
*args : tuple
Arguments.
**kwargs : dict
Keyword arguments.
Returns
-------
value : object
... |
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def arg_to_vec4(func, self_, arg, *args, **kwargs):
""" Decorator for converting argument to vec4 format suitable for 4x4 matrix multiplication. [x, y] => [[x, y... |
if isinstance(arg, (tuple, list, np.ndarray)):
arg = np.array(arg)
flatten = arg.ndim == 1
arg = as_vec4(arg)
ret = func(self_, arg, *args, **kwargs)
if flatten and ret is not None:
return ret.flatten()
return ret
elif hasattr(arg, '_transform_in'):
... |
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def roll(self):
""" Increase the age of all items in the cache by 1. Items whose age is greater than self.max_age will be removed from the cache. """ |
rem = []
for key, item in self._cache.items():
if item[0] > self.max_age:
rem.append(key)
item[0] += 1
for key in rem:
logger.debug("TransformCache remove: %s", key)
del self._cache[key] |
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def histogram(self, data, bins=10, color='w', orientation='h'):
"""Calculate and show a histogram of data Parameters data : array-like Data to histogram. Current... |
self._configure_2d()
hist = scene.Histogram(data, bins, color, orientation)
self.view.add(hist)
self.view.camera.set_range()
return hist |
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def image(self, data, cmap='cubehelix', clim='auto', fg_color=None):
"""Show an image Parameters data : ndarray Should have shape (N, M), (N, M, 3) or (N, M, 4).... |
self._configure_2d(fg_color)
image = scene.Image(data, cmap=cmap, clim=clim)
self.view.add(image)
self.view.camera.aspect = 1
self.view.camera.set_range()
return image |
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def mesh(self, vertices=None, faces=None, vertex_colors=None, face_colors=None, color=(0.5, 0.5, 1.), fname=None, meshdata=None):
"""Show a 3D mesh Parameters ve... |
self._configure_3d()
if fname is not None:
if not all(x is None for x in (vertices, faces, meshdata)):
raise ValueError('vertices, faces, and meshdata must be None '
'if fname is not None')
vertices, faces = read_mesh(fname)[:2]
... |
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def plot(self, data, color='k', symbol=None, line_kind='-', width=1., marker_size=10., edge_color='k', face_color='b', edge_width=1., title=None, xlabel=None, yla... |
self._configure_2d()
line = scene.LinePlot(data, connect='strip', color=color,
symbol=symbol, line_kind=line_kind,
width=width, marker_size=marker_size,
edge_color=edge_color,
face_co... |
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def spectrogram(self, x, n_fft=256, step=None, fs=1., window='hann', color_scale='log', cmap='cubehelix', clim='auto'):
"""Calculate and show a spectrogram Param... |
self._configure_2d()
# XXX once we have axes, we should use "fft_freqs", too
spec = scene.Spectrogram(x, n_fft, step, fs, window,
color_scale, cmap, clim)
self.view.add(spec)
self.view.camera.set_range()
return spec |
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def volume(self, vol, clim=None, method='mip', threshold=None, cmap='grays'):
"""Show a 3D volume Parameters vol : ndarray Volume to render. clim : tuple of two ... |
self._configure_3d()
volume = scene.Volume(vol, clim, method, threshold, cmap=cmap)
self.view.add(volume)
self.view.camera.set_range()
return volume |
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def surface(self, zdata, **kwargs):
"""Show a 3D surface plot. Extra keyword arguments are passed to `SurfacePlot()`. Parameters zdata : array-like A 2D array of... |
self._configure_3d()
surf = scene.SurfacePlot(z=zdata, **kwargs)
self.view.add(surf)
self.view.camera.set_range()
return surf |
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def colorbar(self, cmap, position="right", label="", clim=("", ""), border_width=0.0, border_color="black", **kwargs):
"""Show a ColorBar Parameters cmap : str |... |
self._configure_2d()
cbar = scene.ColorBarWidget(orientation=position,
label_str=label,
cmap=cmap,
clim=clim,
border_width=border_width,
... |
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def redraw(self):
""" Redraw the Vispy canvas """ |
if self._multiscat is not None:
self._multiscat._update()
self.vispy_widget.canvas.update() |
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def remove(self):
""" Remove the layer artist from the visualization """ |
if self._multiscat is None:
return
self._multiscat.deallocate(self.id)
self._multiscat = None
self._viewer_state.remove_global_callback(self._update_scatter)
self.state.remove_global_callback(self._update_scatter) |
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def _check_valid(key, val, valid):
"""Helper to check valid options""" |
if val not in valid:
raise ValueError('%s must be one of %s, not "%s"'
% (key, valid, val)) |
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def _to_args(x):
"""Convert to args representation""" |
if not isinstance(x, (list, tuple, np.ndarray)):
x = [x]
return x |
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def _check_conversion(key, valid_dict):
"""Check for existence of key in dict, return value or raise error""" |
if key not in valid_dict and key not in valid_dict.values():
# Only show users the nice string values
keys = [v for v in valid_dict.keys() if isinstance(v, string_types)]
raise ValueError('value must be one of %s, not %s' % (keys, key))
return valid_dict[key] if key in valid_dict else k... |
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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
def read_pixels(viewport=None, alpha=True, out_type='unsigned_byte'):
"""Read pixels from the currently selected buffer. Under most circumstances, this function ... |
# Check whether the GL context is direct or remote
context = get_current_canvas().context
if context.shared.parser.is_remote():
raise RuntimeError('Cannot use read_pixels() with remote GLIR parser')
finish() # noqa - finish first, also flushes GLIR commands
type_dict = {'unsigned_byte... |
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