esengine/source/src/ECS/Components/Physics/Colliders/CircleCollider.ts

module es {
    export class CircleCollider extends Collider {
        /**
         * 创建一个具有半径的CircleCollider。
         * 请注意，当指定半径时，如果在实体上使用RenderableComponent，您将需要设置原点来对齐CircleCollider。
         * 例如，如果RenderableComponent有一个0,0的原点，并且创建了一个半径为1.5f * renderable.width的CircleCollider，你可以通过设置originNormalied为中心除以缩放尺寸来偏移原点
         *
         * @param radius
         */
        constructor(radius: number = 1) {
            super();

            this.shape = new Circle(radius);
            if (radius == 1) {
                this._colliderRequiresAutoSizing = true;
            }
        }

        public get radius(): number {
            return (this.shape as Circle).radius;
        }

        public set radius(value: number) {
            this.setRadius(value);
        }

        /**
         * 设置圆的半径
         * @param radius
         */
        public setRadius(radius: number): CircleCollider {
            this._colliderRequiresAutoSizing = false;
            let circle = this.shape as Circle;
            if (radius != circle.radius) {
                circle.radius = radius;
                circle._originalRadius = radius;
                this._isPositionDirty = true;

                if (this.entity != null && this._isParentEntityAddedToScene)
                    Physics.updateCollider(this);
            }

            return this;
        }

        public debugRender(batcher: IBatcher) {
            batcher.drawHollowRect(this.bounds.x, this.bounds.y, this.bounds.width, this.bounds.height, new Color(76, 76, 76, 76), 2);
            batcher.end();
            batcher.drawCircle(this.shape.position, this.radius, new Color(139, 0, 0), 2);
            batcher.end();
            batcher.drawPixel(this.entity.transform.position, new Color(255, 255, 0), 4);
            batcher.end();
            batcher.drawPixel(this.shape.position, new Color(255, 0, 0), 2);
            batcher.end();
        }

        public toString() {
            return `[CircleCollider: bounds: ${this.bounds}, radius: ${(this.shape as Circle).radius}]`
        }
    }
}