94 lines
3.4 KiB
TypeScript
94 lines
3.4 KiB
TypeScript
///<reference path="./Polygon.ts" />
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module es {
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/**
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* 多边形的特殊情况。在进行SAT碰撞检查时，我们只需要检查2个轴而不是8个轴
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*/
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export class Box extends Polygon {
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public width: number;
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public height: number;
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constructor(width: number, height: number) {
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super(Box.buildBox(width, height), true);
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this.width = width;
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this.height = height;
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}
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/**
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* 在一个盒子的形状中建立多边形需要的点的帮助方法
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* @param width
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* @param height
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*/
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private static buildBox(width: number, height: number): Vector2[] {
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// 我们在(0,0)的中心周围创建点
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let halfWidth = width / 2;
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let halfHeight = height / 2;
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let verts = new Array(4);
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verts[0] = new Vector2(-halfWidth, -halfHeight);
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verts[1] = new Vector2(halfWidth, -halfHeight);
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verts[2] = new Vector2(halfWidth, halfHeight);
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verts[3] = new Vector2(-halfWidth, halfHeight);
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return verts;
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}
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/**
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* 更新框点，重新计算中心，设置宽度/高度
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* @param width
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* @param height
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*/
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public updateBox(width: number, height: number) {
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this.width = width;
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this.height = height;
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// 我们在(0,0)的中心周围创建点
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let halfWidth = width / 2;
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let halfHeight = height / 2;
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this.points[0] = new Vector2(-halfWidth, -halfHeight);
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this.points[1] = new Vector2(halfWidth, -halfHeight);
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this.points[2] = new Vector2(halfWidth, halfHeight);
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this.points[3] = new Vector2(-halfWidth, halfHeight);
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for (let i = 0; i < this.points.length; i++)
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this._originalPoints[i] = this.points[i];
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}
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public overlaps(other: Shape) {
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// 特殊情况，这一个高性能方式实现，其他情况则使用polygon方法检测
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if (this.isUnrotated) {
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if (other instanceof Box && other.isUnrotated)
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return this.bounds.intersects(other.bounds);
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if (other instanceof Circle)
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return Collisions.rectToCircle(this.bounds, other.position, other.radius);
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}
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return super.overlaps(other);
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}
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public collidesWithShape(other: Shape, result: CollisionResult): boolean {
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// 特殊情况，这一个高性能方式实现，其他情况则使用polygon方法检测
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if (other instanceof Box && (other as Box).isUnrotated) {
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return ShapeCollisionsBox.boxToBox(this, other, result);
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}
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// TODO: 让 minkowski 运行于 cricleToBox
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return super.collidesWithShape(other, result);
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}
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public containsPoint(point: Vector2) {
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if (this.isUnrotated)
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return this.bounds.contains(point.x, point.y);
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return super.containsPoint(point);
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}
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public pointCollidesWithShape(point: es.Vector2, result: es.CollisionResult): boolean {
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if (this.isUnrotated)
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return ShapeCollisionsPoint.pointToBox(point, this, result);
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return super.pointCollidesWithShape(point, result);
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}
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}
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} |