adding inner and outer offsets

Author: romanarust

docs/examples/straight_skeleton_offset.py

@@ -0,0 +1,36 @@
+from compas.datastructures import Graph
+from compas.geometry import Polygon
+from compas_cgal.straight_skeleton_2 import create_offset_polygons_2
+from compas_viewer import Viewer
+
+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)
+offset = 1.5
+
+offset_polygons_inner = create_offset_polygons_2(points, offset)
+offset_polygons_outer = create_offset_polygons_2(points, -offset)
+
+# ==============================================================================
+# Viz
+# ==============================================================================
+
+viewer = Viewer(width=1600, height=900)
+viewer.scene.add(polygon)
+
+for opolygon in offset_polygons_inner:
+    viewer.scene.add(opolygon, linecolor=(1.0, 0.0, 0.0))
+for opolygon in offset_polygons_outer:
+    viewer.scene.add(opolygon, linecolor=(0.0, 0.0, 1.0))
+
+viewer.show()