constructor (center: Coords2d, radius: number) { super(); this.center = center.copy(); this.radius = radius; }
constructor (start: Coords2d, end: Coords2d) { super(); this.start = start.copy(); this.end = end.copy(); this.lineDash = null; }
set apex (apex: Coords2d) { this._apex = apex.copy(); this._needsRedraw = true; }