RoundedPolygon.star constructor

RoundedPolygon.star({ required int numVerticesPerRadius, double radius = 1.0, double innerRadius = 0.5, CornerRounding rounding = .unrounded, CornerRounding? innerRounding, List<CornerRounding>? perVertexRounding, double centerX = 0.0, double centerY = 0.0, })

Implementation

factory RoundedPolygon.star({
  required int numVerticesPerRadius,
  double radius = 1.0,
  double innerRadius = 0.5,
  CornerRounding rounding = .unrounded,
  CornerRounding? innerRounding,
  List<CornerRounding>? perVertexRounding,
  double centerX = 0.0,
  double centerY = 0.0,
}) {
  if (radius <= 0.0) {
    throw ArgumentError.value(
      radius,
      "radius",
      "Star radii must both be greater than 0.",
    );
  }
  if (innerRadius <= 0.0) {
    throw ArgumentError.value(
      innerRadius,
      "innerRadius",
      "Star radii must both be greater than 0.",
    );
  }
  if (innerRadius >= radius) {
    throw ArgumentError("innerRadius must be less than radius");
  }

  var pvRounding = perVertexRounding;
  // If no per-vertex rounding supplied and caller asked for inner rounding,
  // create per-vertex rounding list based on supplied outer/inner rounding parameters
  if (pvRounding == null && innerRounding != null) {
    // TODO: consider reverting back to the original flattening implementation
    pvRounding = .generate(
      numVerticesPerRadius * 2,
      (index) => index.isEven ? rounding : innerRounding,
    );
  }

  // Star polygon is just a polygon with all vertices supplied (where we generate
  // those vertices to be on the inner/outer radii)
  return .fromVertices(
    vertices: _starVerticesFromNumVerts(
      numVerticesPerRadius,
      radius,
      innerRadius,
      centerX,
      centerY,
    ),
    rounding: rounding,
    perVertexRounding: pvRounding,
    centerX: centerX,
    centerY: centerY,
  );
}