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Floor plan renderer — render a FloorPlan schema to SVG and/or PIL Image.
Two rendering paths:
1. SVG string output (always available, for file export / browser display)
2. PIL Image output (rasterizes via PIL ImageDraw — no system deps needed)
"""
from __future__ import annotations
import io
import math
from typing import Optional
import numpy as np
from PIL import Image, ImageDraw, ImageFont
from shapely.geometry import Polygon, MultiPolygon
from .schema import FloorPlan, Wall, Opening, OpeningType, Room, RoomLabel
from .geometry import (
wall_to_polygon,
wall_polygon_with_openings,
detect_rooms_from_walls,
interpolate_along_centerline,
normal_at_distance,
compute_centerline_length,
)
# ── Color scheme ──
ROOM_COLORS: dict[RoomLabel, str] = {
RoomLabel.BEDROOM: "#81C784",
RoomLabel.BATHROOM: "#64B5F6",
RoomLabel.KITCHEN: "#FFB74D",
RoomLabel.LIVING_ROOM: "#CE93D8",
RoomLabel.DINING_ROOM: "#F48FB1",
RoomLabel.HALLWAY: "#E0E0E0",
RoomLabel.CLOSET: "#BCAAA4",
RoomLabel.LAUNDRY: "#80CBC4",
RoomLabel.GARAGE: "#B0BEC5",
RoomLabel.BALCONY: "#A5D6A7",
RoomLabel.OFFICE: "#90CAF9",
RoomLabel.STORAGE: "#D7CCC8",
RoomLabel.ENTRANCE: "#FFF59D",
RoomLabel.OTHER: "#CFD8DC",
RoomLabel.UNKNOWN: "#E8EAF6",
}
WALL_COLOR = "#37474F"
WALL_STROKE = "#263238"
DOOR_COLOR = "#FF7043"
WINDOW_COLOR = "#29B6F6"
ROOM_LABEL_COLOR = "#212121"
def _hex_to_rgba(hex_color: str, alpha: int = 255) -> tuple[int, int, int, int]:
h = hex_color.lstrip("#")
r, g, b = int(h[0:2], 16), int(h[2:4], 16), int(h[4:6], 16)
return (r, g, b, alpha)
def _shapely_poly_to_xy(poly: Polygon) -> list[tuple[float, float]]:
return list(poly.exterior.coords)
# ──────────────────────────────────────────────
# SVG Renderer
# ──────────────────────────────────────────────
def render_floorplan_svg(
floorplan: FloorPlan,
width: int = 1024, height: int = 1024, padding: float = 0.5,
show_rooms: bool = True, show_openings: bool = True, show_labels: bool = True,
wall_opacity: float = 0.85, room_opacity: float = 0.3,
room_polygons: Optional[list[Polygon]] = None,
) -> str:
"""Render a FloorPlan to an SVG string."""
if not floorplan.walls:
return f'<svg width="{width}" height="{height}" xmlns="http://www.w3.org/2000/svg"></svg>'
bbox = _compute_bbox(floorplan, padding)
scale, tx, ty = _compute_transform(bbox, width, height)
parts = [
f'<svg width="{width}" height="{height}" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 {width} {height}">',
f' <rect width="{width}" height="{height}" fill="white" />',
]
if show_rooms:
if room_polygons is None:
room_polygons = detect_rooms_from_walls(floorplan.walls)
for i, rpoly in enumerate(room_polygons):
label = RoomLabel.UNKNOWN
if i < len(floorplan.rooms):
label = floorplan.rooms[i].label or RoomLabel.UNKNOWN
color = ROOM_COLORS.get(label, ROOM_COLORS[RoomLabel.UNKNOWN])
coords = [(tx(x), ty(y)) for x, y in rpoly.exterior.coords]
d = "M " + " L ".join(f"{x:.1f} {y:.1f}" for x, y in coords) + " Z"
parts.append(f' <path d="{d}" fill="{color}" opacity="{room_opacity}" />')
if show_labels:
cx, cy = tx(rpoly.centroid.x), ty(rpoly.centroid.y)
lt = label.value.replace("_", " ").title() if label != RoomLabel.UNKNOWN else "?"
fs = max(10, scale * 0.25)
parts.append(f' <text x="{cx:.0f}" y="{cy:.0f}" text-anchor="middle" dominant-baseline="central" font-family="sans-serif" font-size="{fs:.0f}" fill="{ROOM_LABEL_COLOR}" font-weight="bold">{lt}</text>')
parts.append(f' <text x="{cx:.0f}" y="{cy + fs * 1.2:.0f}" text-anchor="middle" dominant-baseline="central" font-family="sans-serif" font-size="{fs * 0.7:.0f}" fill="{ROOM_LABEL_COLOR}" opacity="0.6">{rpoly.area:.1f} m\u00b2</text>')
for wall in floorplan.walls:
geom = wall_polygon_with_openings(wall) if (wall.openings and show_openings) else wall_to_polygon(wall)
polys = [geom] if isinstance(geom, Polygon) else list(geom.geoms) if isinstance(geom, MultiPolygon) else []
for poly in polys:
coords = [(tx(x), ty(y)) for x, y in poly.exterior.coords]
d = "M " + " L ".join(f"{x:.1f} {y:.1f}" for x, y in coords) + " Z"
for interior in poly.interiors:
hc = [(tx(x), ty(y)) for x, y in interior.coords]
d += " M " + " L ".join(f"{x:.1f} {y:.1f}" for x, y in hc) + " Z"
parts.append(f' <path d="{d}" fill="{WALL_COLOR}" opacity="{wall_opacity}" stroke="{WALL_STROKE}" stroke-width="0.5" fill-rule="evenodd" />')
if show_openings:
for wall in floorplan.walls:
for opening in wall.openings:
coords = wall.centerline_coords
half_t = wall.thickness / 2.0
s = interpolate_along_centerline(coords, opening.start)
e = interpolate_along_centerline(coords, opening.start + opening.length)
n = normal_at_distance(coords, opening.start + opening.length / 2)
color = DOOR_COLOR if opening.type == OpeningType.DOOR else WINDOW_COLOR
sw = max(1.5, wall.thickness * scale * 0.25)
sx, sy, ex, ey = tx(s[0]), ty(s[1]), tx(e[0]), ty(e[1])
parts.append(f' <line x1="{sx:.1f}" y1="{sy:.1f}" x2="{ex:.1f}" y2="{ey:.1f}" stroke="{color}" stroke-width="{sw:.1f}" stroke-linecap="round" />')
if opening.type == OpeningType.WINDOW:
off = half_t * 0.4
for sign in [-1, 1]:
parts.append(f' <line x1="{tx(s[0]+n[0]*off*sign):.1f}" y1="{ty(s[1]+n[1]*off*sign):.1f}" x2="{tx(e[0]+n[0]*off*sign):.1f}" y2="{ty(e[1]+n[1]*off*sign):.1f}" stroke="{WINDOW_COLOR}" stroke-width="{sw*0.3:.1f}" opacity="0.7" />')
if opening.type == OpeningType.DOOR:
tick = half_t * 0.8
for pt in [s, e]:
parts.append(f' <line x1="{tx(pt[0]+n[0]*tick):.1f}" y1="{ty(pt[1]+n[1]*tick):.1f}" x2="{tx(pt[0]-n[0]*tick):.1f}" y2="{ty(pt[1]-n[1]*tick):.1f}" stroke="{color}" stroke-width="{sw*0.5:.1f}" />')
parts.append('</svg>')
return "\n".join(parts)
# ──────────────────────────────────────────────
# PIL Renderer
# ──────────────────────────────────────────────
def render_to_image(
floorplan: FloorPlan,
width: int = 1024, height: int = 1024, padding: float = 0.5,
show_rooms: bool = True, show_openings: bool = True, show_labels: bool = True,
wall_opacity: float = 0.85, room_opacity: float = 0.3,
room_polygons: Optional[list[Polygon]] = None, background: str = "white",
) -> Image.Image:
"""Render floor plan to a PIL RGBA Image using ImageDraw."""
if not floorplan.walls:
return Image.new("RGBA", (width, height), background)
bbox = _compute_bbox(floorplan, padding)
scale, tx, ty = _compute_transform(bbox, width, height)
img = Image.new("RGBA", (width, height), (255, 255, 255, 255))
if show_rooms:
if room_polygons is None:
room_polygons = detect_rooms_from_walls(floorplan.walls)
room_layer = Image.new("RGBA", (width, height), (0, 0, 0, 0))
room_draw = ImageDraw.Draw(room_layer)
for i, rpoly in enumerate(room_polygons):
label = RoomLabel.UNKNOWN
if i < len(floorplan.rooms):
label = floorplan.rooms[i].label or RoomLabel.UNKNOWN
color = ROOM_COLORS.get(label, ROOM_COLORS[RoomLabel.UNKNOWN])
rgba = _hex_to_rgba(color, int(255 * room_opacity))
coords = [(tx(x), ty(y)) for x, y in rpoly.exterior.coords]
room_draw.polygon(coords, fill=rgba)
img = Image.alpha_composite(img, room_layer)
wall_layer = Image.new("RGBA", (width, height), (0, 0, 0, 0))
wall_draw = ImageDraw.Draw(wall_layer)
wall_rgba = _hex_to_rgba(WALL_COLOR, int(255 * wall_opacity))
wall_stroke_rgba = _hex_to_rgba(WALL_STROKE, int(255 * wall_opacity))
for wall in floorplan.walls:
geom = wall_polygon_with_openings(wall) if (wall.openings and show_openings) else wall_to_polygon(wall)
polys = [geom] if isinstance(geom, Polygon) else list(geom.geoms) if isinstance(geom, MultiPolygon) else []
for poly in polys:
coords = [(tx(x), ty(y)) for x, y in poly.exterior.coords]
wall_draw.polygon(coords, fill=wall_rgba, outline=wall_stroke_rgba)
img = Image.alpha_composite(img, wall_layer)
if show_openings:
opening_layer = Image.new("RGBA", (width, height), (0, 0, 0, 0))
opening_draw = ImageDraw.Draw(opening_layer)
for wall in floorplan.walls:
for opening in wall.openings:
coords = wall.centerline_coords
half_t = wall.thickness / 2.0
s = interpolate_along_centerline(coords, opening.start)
e = interpolate_along_centerline(coords, opening.start + opening.length)
n = normal_at_distance(coords, opening.start + opening.length / 2)
color = DOOR_COLOR if opening.type == OpeningType.DOOR else WINDOW_COLOR
rgba = _hex_to_rgba(color, 230)
lw = max(2, int(wall.thickness * scale * 0.25))
sx, sy, ex, ey = tx(s[0]), ty(s[1]), tx(e[0]), ty(e[1])
opening_draw.line([(sx, sy), (ex, ey)], fill=rgba, width=lw)
if opening.type == OpeningType.WINDOW:
off = half_t * 0.4
win_rgba = _hex_to_rgba(WINDOW_COLOR, 180)
for sign in [-1, 1]:
opening_draw.line(
[(tx(s[0]+n[0]*off*sign), ty(s[1]+n[1]*off*sign)),
(tx(e[0]+n[0]*off*sign), ty(e[1]+n[1]*off*sign))],
fill=win_rgba, width=max(1, lw // 3))
if opening.type == OpeningType.DOOR:
tick = half_t * 0.8
for pt in [s, e]:
opening_draw.line(
[(tx(pt[0]+n[0]*tick), ty(pt[1]+n[1]*tick)),
(tx(pt[0]-n[0]*tick), ty(pt[1]-n[1]*tick))],
fill=rgba, width=max(1, lw // 2))
img = Image.alpha_composite(img, opening_layer)
if show_labels:
label_draw = ImageDraw.Draw(img)
try:
font_large = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", max(10, int(scale * 0.25)))
font_small = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", max(8, int(scale * 0.18)))
font_tiny = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", max(7, int(scale * 0.12)))
except (OSError, IOError):
font_large = ImageFont.load_default()
font_small = font_large
font_tiny = font_large
if show_rooms and room_polygons:
for i, rpoly in enumerate(room_polygons):
label = RoomLabel.UNKNOWN
if i < len(floorplan.rooms):
label = floorplan.rooms[i].label or RoomLabel.UNKNOWN
lt = label.value.replace("_", " ").title() if label != RoomLabel.UNKNOWN else "?"
cx, cy = tx(rpoly.centroid.x), ty(rpoly.centroid.y)
label_draw.text((cx, cy), lt, fill=ROOM_LABEL_COLOR, font=font_large, anchor="mm")
label_draw.text((cx, cy + scale * 0.35), f"{rpoly.area:.1f} m\u00b2", fill=(33, 33, 33, 150), font=font_small, anchor="mm")
for wall in floorplan.walls:
cl = wall.centerline_coords
mid_d = compute_centerline_length(cl) / 2
mid_pt = interpolate_along_centerline(cl, mid_d)
n = normal_at_distance(cl, mid_d)
off = wall.thickness * 0.8 + 0.15
lx, ly = tx(mid_pt[0] + n[0] * off), ty(mid_pt[1] + n[1] * off)
label_draw.text((lx, ly), wall.id, fill=(120, 144, 156, 180), font=font_tiny, anchor="mm")
if show_openings:
for wall in floorplan.walls:
for opening in wall.openings:
coords = wall.centerline_coords
s = interpolate_along_centerline(coords, opening.start)
e = interpolate_along_centerline(coords, opening.start + opening.length)
n = normal_at_distance(coords, opening.start + opening.length / 2)
mx = (tx(s[0]) + tx(e[0])) / 2
my = (ty(s[1]) + ty(e[1])) / 2
off = wall.thickness * scale * 0.6
color = DOOR_COLOR if opening.type == OpeningType.DOOR else WINDOW_COLOR
label_draw.text((mx + n[0]*off, my + n[1]*off), opening.id, fill=color, font=font_tiny, anchor="mm")
return img
def overlay_on_image(
floorplan: FloorPlan,
original_image: Image.Image | str,
schema_opacity: float = 0.55,
original_opacity: float = 0.7,
room_polygons: Optional[list[Polygon]] = None,
**kwargs,
) -> Image.Image:
"""Render the floor plan schema and overlay it on the original image."""
if isinstance(original_image, str):
original_image = Image.open(original_image)
original_image = original_image.convert("RGBA")
w, h = original_image.size
rendered = render_to_image(floorplan, width=w, height=h, room_opacity=0.2, wall_opacity=0.7, room_polygons=room_polygons, **kwargs)
r, g, b, a = rendered.split()
a_array = np.array(a).astype(float)
a_array = (a_array * schema_opacity).clip(0, 255).astype(np.uint8)
rendered.putalpha(Image.fromarray(a_array))
r_o, g_o, b_o, a_o = original_image.split()
a_o_array = np.array(a_o).astype(float)
a_o_array = (a_o_array * original_opacity).clip(0, 255).astype(np.uint8)
original_dim = original_image.copy()
original_dim.putalpha(Image.fromarray(a_o_array))
result = Image.new("RGBA", (w, h), (255, 255, 255, 255))
result = Image.alpha_composite(result, original_dim)
result = Image.alpha_composite(result, rendered)
return result
# ──────────────────────────────────────────────
# Shared helpers
# ──────────────────────────────────────────────
def _compute_bbox(floorplan: FloorPlan, padding: float) -> tuple[float, float, float, float]:
all_coords = []
for wall in floorplan.walls:
poly = wall_to_polygon(wall)
all_coords.extend(poly.exterior.coords)
xs = [c[0] for c in all_coords]
ys = [c[1] for c in all_coords]
return (min(xs) - padding, min(ys) - padding, max(xs) + padding, max(ys) + padding)
def _compute_transform(bbox, width, height):
min_x, min_y, max_x, max_y = bbox
span_x = max_x - min_x
span_y = max_y - min_y
scale = min(width / span_x, height / span_y)
used_w = span_x * scale
used_h = span_y * scale
offset_x = (width - used_w) / 2
offset_y = (height - used_h) / 2
def tx(x): return (x - min_x) * scale + offset_x
def ty(y): return (y - min_y) * scale + offset_y
return scale, tx, ty
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