VertexLoop

A sequence of vertices forming an open or closed loop

Provides utilities for geometric operations like centroid, area, and bounds. Can be subclassed for specific geometric primitives.

Constructor

VertexLoop(vertices: Points2D, closed: bool = True)

Initialize a vertex loop

area()

Calculate the signed area of the loop

bounds()

Calculate bounding box (min_x, min_y, max_x, max_y)

centroid()

Calculate the centroid (geometric center) of the vertices

is_clockwise()

Check if the loop has clockwise winding (negative area)

reverse()

Return a new VertexLoop with reversed vertex order

rotate(
    angle_degrees: float,
    center: Optional[Point2D] = None
) -> VertexLoop

Rotate vertices in-place by angle_degrees around center

angle_degrees: Rotation angle in degrees (positive = counter-clockwise)
center: Center of rotation (default is origin) Returns self for method chaining.

scale(sx: float, sy: Optional[float] = None) -> VertexLoop

Scale vertices in-place by (sx, sy)

translate(dx: float, dy: float) -> VertexLoop

Translate vertices in-place by (dx, dy)