Weighted Polygon Offsetting

This example demonstrates how to create weighted offset polygons using COMPAS CGAL.

Key Features:

• Creating weighted polygon offsets
• Specifying different weights for each edge
• Visualization of original and weighted offset polygons

from compas.geometry import Polygon
from compas_viewer import Viewer

from compas_cgal.straight_skeleton_2 import weighted_offset_polygon

points = [
    (-1.91, 3.59, 0.0),
    (-5.53, -5.22, 0.0),
    (-0.39, -1.98, 0.0),
    (2.98, -5.51, 0.0),
    (4.83, -2.02, 0.0),
    (9.70, -3.63, 0.0),
    (12.23, 1.25, 0.0),
    (3.42, 0.66, 0.0),
    (2.92, 4.03, 0.0),
    (-1.91, 3.59, 0.0),
]
polygon = Polygon(points)

distances = [0.1, 0.3, 0.6, 0.1, 0.7, 0.5, 0.2, 0.4, 0.8, 0.2]
weights = [1.0 / d for d in distances]
offset = 1.0
offset_polygons_outer = weighted_offset_polygon(points, -offset, weights)

# ==============================================================================
# Visualize
# ==============================================================================

viewer = Viewer()
viewer.scene.add(polygon)
viewer.config.renderer.show_grid = False

for opolygon in offset_polygons_outer:
    viewer.scene.add(opolygon, linecolor=(0.0, 0.0, 1.0), facecolor=(1.0, 1.0, 1.0, 0.0))

viewer.show()