KCircle2d interface

KCircle2d类代表着二维空间中的一个圆。

The KCircle2d class represents a circle in 2d space.

Signature:

export interface KCircle2d extends KCurve2d 

Links: export interface KCircle2d extends KCurve2d

Extends: KCurve2d

Properties

Property	Modifiers	Type	Description
center	readonly	KPoint2d	获取圆心。 Get center of the circle.
radius	readonly	number	获取圆的半径。 Get radius of the circle.

Methods

Method	Description
getTangent(point)	获取圆上一点的法向量。 注意：传入点需要确保落在圆上。 Get circle's tangent vector of a point on the circle. NOTE: the caller need to make sure the point is on the circle.
transform(matrix)	对当前圆进行变换。 注意：如果变换之后的几何不是一个圆，则会抛出error, 本操作仅支持旋转和平移。 Transform this circle to a new one. NOTE: If the new one is not a circle, it will throw error. Only support for rotate and move translation now.