83 lines
3.6 KiB
TypeScript
83 lines
3.6 KiB
TypeScript
///<reference path="./Shape.ts" />
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module es {
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export class Circle extends Shape {
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public radius: number;
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public _originalRadius: number;
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constructor(radius: number) {
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super();
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this.radius = radius;
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this._originalRadius = radius;
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}
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public recalculateBounds(collider: es.Collider) {
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// 如果我们没有旋转或不关心TRS我们使用localOffset作为中心
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this.center = collider.localOffset;
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if (collider.shouldColliderScaleAndRotateWithTransform) {
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// 我们只将直线缩放为一个圆，所以我们将使用最大值
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let scale = collider.entity.transform.scale;
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let hasUnitScale = scale.x == 1 && scale.y == 1;
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let maxScale = Math.max(scale.x, scale.y);
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this.radius = this._originalRadius * maxScale;
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if (collider.entity.transform.rotation != 0) {
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// 为了处理偏移原点的旋转，我们只需要将圆心围绕(0,0)在一个圆上移动，我们的偏移量就是0角
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let offsetAngle = Math.atan2(collider.localOffset.y, collider.localOffset.x) * MathHelper.Rad2Deg;
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let offsetLength = hasUnitScale ? collider._localOffsetLength : Vector2.multiply(collider.localOffset, collider.entity.transform.scale).length();
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this.center = MathHelper.pointOnCirlce(Vector2.zero, offsetLength, collider.entity.transform.rotation + offsetAngle);
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}
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}
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this.position = Vector2.add(collider.transform.position, this.center);
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this.bounds = new Rectangle(this.position.x - this.radius, this.position.y - this.radius, this.radius * 2, this.radius * 2);
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}
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public overlaps(other: Shape) {
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let result: CollisionResult = new CollisionResult();
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if (other instanceof Box && (other as Box).isUnrotated)
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return Collisions.isRectToCircle(other.bounds, this.position, this.radius);
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if (other instanceof Circle)
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return Collisions.isCircleToCircle(this.position, this.radius, other.position, (other as Circle).radius);
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if (other instanceof Polygon)
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return ShapeCollisions.circleToPolygon(this, other, result);
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throw new Error(`overlaps of circle to ${other} are not supported`);
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}
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public collidesWithShape(other: Shape, result: CollisionResult): boolean {
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if (other instanceof Box && (other as Box).isUnrotated) {
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return ShapeCollisions.circleToBox(this, other, result);
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}
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if (other instanceof Circle) {
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return ShapeCollisions.circleToCircle(this, other, result);
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}
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if (other instanceof Polygon) {
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return ShapeCollisions.circleToPolygon(this, other, result);
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}
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throw new Error(`Collisions of Circle to ${other} are not supported`);
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}
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public collidesWithLine(start: es.Vector2, end: es.Vector2, hit: es.RaycastHit): boolean {
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return ShapeCollisions.lineToCircle(start, end, this, hit);
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}
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/**
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* 获取所提供的点是否在此范围内
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* @param point
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*/
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public containsPoint(point: es.Vector2) {
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return (Vector2.subtract(point, this.position)).lengthSquared() <= this.radius * this.radius;
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}
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public pointCollidesWithShape(point: Vector2, result: CollisionResult): boolean {
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return ShapeCollisions.pointToCircle(point, this, result);
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}
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}
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}
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