YHH
351 lines
13 KiB
TypeScript
351 lines
13 KiB
TypeScript
module es {
|
|
export class SpatialHash {
|
|
public gridBounds: Rectangle = new Rectangle();
|
|
|
|
public _raycastParser: RaycastResultParser;
|
|
/**
|
|
* 散列中每个单元格的大小
|
|
*/
|
|
public _cellSize: number;
|
|
/**
|
|
* 1除以单元格大小。缓存结果，因为它被大量使用。
|
|
*/
|
|
public _inverseCellSize: number;
|
|
/**
|
|
* 缓存的循环用于重叠检查
|
|
*/
|
|
public _overlapTestCircle: Circle = new Circle(0);
|
|
/**
|
|
* 保存所有数据的字典
|
|
*/
|
|
public _cellDict: NumberDictionary = new NumberDictionary();
|
|
/**
|
|
* 用于返回冲突信息的共享HashSet
|
|
*/
|
|
public _tempHashSet: Collider[] = [];
|
|
|
|
constructor(cellSize: number = 100) {
|
|
this._cellSize = cellSize;
|
|
this._inverseCellSize = 1 / this._cellSize;
|
|
this._raycastParser = new RaycastResultParser();
|
|
}
|
|
|
|
/**
|
|
* 将对象添加到SpatialHash
|
|
* @param collider
|
|
*/
|
|
public register(collider: Collider) {
|
|
let bounds = collider.bounds;
|
|
collider.registeredPhysicsBounds = bounds;
|
|
let p1 = this.cellCoords(bounds.x, bounds.y);
|
|
let p2 = this.cellCoords(bounds.right, bounds.bottom);
|
|
|
|
// 更新边界以跟踪网格大小
|
|
if (!this.gridBounds.contains(p1.x, p1.y)) {
|
|
this.gridBounds = RectangleExt.union(this.gridBounds, p1);
|
|
}
|
|
|
|
if (!this.gridBounds.contains(p2.x, p2.y)) {
|
|
this.gridBounds = RectangleExt.union(this.gridBounds, p2);
|
|
}
|
|
|
|
for (let x = p1.x; x <= p2.x; x++) {
|
|
for (let y = p1.y; y <= p2.y; y++) {
|
|
// 如果没有单元格，我们需要创建它
|
|
let c: Collider[] = this.cellAtPosition(x, y, true);
|
|
if (!c.firstOrDefault(c => c.hashCode == collider.hashCode))
|
|
c.push(collider);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 从SpatialHash中删除对象
|
|
* @param collider
|
|
*/
|
|
public remove(collider: Collider) {
|
|
let bounds = collider.registeredPhysicsBounds;
|
|
let p1 = this.cellCoords(bounds.x, bounds.y);
|
|
let p2 = this.cellCoords(bounds.right, bounds.bottom);
|
|
|
|
for (let x = p1.x; x <= p2.x; x++) {
|
|
for (let y = p1.y; y <= p2.y; y++) {
|
|
// 单元格应该始终存在，因为这个碰撞器应该在所有查询的单元格中
|
|
let cell = this.cellAtPosition(x, y);
|
|
if (!cell)
|
|
console.log(`从不存在碰撞器的单元格中移除碰撞器: [${collider}]`);
|
|
else
|
|
cell.remove(collider);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 使用蛮力方法从SpatialHash中删除对象
|
|
* @param obj
|
|
*/
|
|
public removeWithBruteForce(obj: Collider) {
|
|
this._cellDict.remove(obj);
|
|
}
|
|
|
|
public clear() {
|
|
this._cellDict.clear();
|
|
}
|
|
|
|
/**
|
|
* debug绘制空间散列的内容
|
|
* @param secondsToDisplay
|
|
* @param textScale
|
|
*/
|
|
public debugDraw(secondsToDisplay: number, textScale: number = 1) {
|
|
for (let x = this.gridBounds.x; x <= this.gridBounds.right; x++) {
|
|
for (let y = this.gridBounds.y; y <= this.gridBounds.bottom; y++) {
|
|
let cell = this.cellAtPosition(x, y);
|
|
if (cell && cell.length > 0)
|
|
this.debugDrawCellDetails(x, y, cell.length, secondsToDisplay, textScale);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 返回边框与单元格相交的所有对象
|
|
* @param bounds
|
|
* @param excludeCollider
|
|
* @param layerMask
|
|
*/
|
|
public aabbBroadphase(bounds: Rectangle, excludeCollider: Collider, layerMask: number): Collider[] {
|
|
this._tempHashSet.length = 0;
|
|
|
|
let p1 = this.cellCoords(bounds.x, bounds.y);
|
|
let p2 = this.cellCoords(bounds.right, bounds.bottom);
|
|
|
|
for (let x = p1.x; x <= p2.x; x++) {
|
|
for (let y = p1.y; y <= p2.y; y++) {
|
|
let cell = this.cellAtPosition(x, y);
|
|
if (!cell)
|
|
continue;
|
|
|
|
// 当cell不为空。循环并取回所有碰撞器
|
|
for (let i = 0; i < cell.length; i++) {
|
|
let collider = cell[i];
|
|
|
|
// 如果它是自身或者如果它不匹配我们的层掩码 跳过这个碰撞器
|
|
if (collider == excludeCollider || !Flags.isFlagSet(layerMask, collider.physicsLayer))
|
|
continue;
|
|
|
|
if (bounds.intersects(collider.bounds)) {
|
|
if (!this._tempHashSet.firstOrDefault(c => c.hashCode == collider.hashCode))
|
|
this._tempHashSet.push(collider);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return this._tempHashSet;
|
|
}
|
|
|
|
/**
|
|
* 获取位于指定圆内的所有碰撞器
|
|
* @param circleCenter
|
|
* @param radius
|
|
* @param results
|
|
* @param layerMask
|
|
*/
|
|
public overlapCircle(circleCenter: Vector2, radius: number, results: Collider[], layerMask): number {
|
|
let bounds = new Rectangle(circleCenter.x - radius, circleCenter.y - radius, radius * 2, radius * 2);
|
|
|
|
this._overlapTestCircle.radius = radius;
|
|
this._overlapTestCircle.position = circleCenter;
|
|
|
|
let resultCounter = 0;
|
|
let potentials = this.aabbBroadphase(bounds, null, layerMask);
|
|
for (let i = 0; i < potentials.length; i++) {
|
|
let collider = potentials[i];
|
|
if (collider instanceof BoxCollider) {
|
|
results[resultCounter] = collider;
|
|
resultCounter++;
|
|
} else if (collider instanceof CircleCollider) {
|
|
if (collider.shape.overlaps(this._overlapTestCircle)) {
|
|
results[resultCounter] = collider;
|
|
resultCounter++;
|
|
}
|
|
} else if (collider instanceof PolygonCollider) {
|
|
if (collider.shape.overlaps(this._overlapTestCircle)) {
|
|
results[resultCounter] = collider;
|
|
resultCounter++;
|
|
}
|
|
} else {
|
|
throw new Error("overlapCircle against this collider type is not implemented!");
|
|
}
|
|
|
|
// 如果我们所有的结果数据有了则返回
|
|
if (resultCounter == results.length)
|
|
return resultCounter;
|
|
}
|
|
|
|
return resultCounter;
|
|
}
|
|
|
|
/**
|
|
* 获取单元格的x,y值作为世界空间的x,y值
|
|
* @param x
|
|
* @param y
|
|
*/
|
|
private cellCoords(x: number, y: number): Vector2 {
|
|
return new Vector2(Math.floor(x * this._inverseCellSize), Math.floor(y * this._inverseCellSize));
|
|
}
|
|
|
|
/**
|
|
* 获取世界空间x,y值的单元格。
|
|
* 如果单元格为空且createCellIfEmpty为true，则会创建一个新的单元格
|
|
* @param x
|
|
* @param y
|
|
* @param createCellIfEmpty
|
|
*/
|
|
private cellAtPosition(x: number, y: number, createCellIfEmpty: boolean = false): Collider[] {
|
|
let cell: Collider[] = this._cellDict.tryGetValue(x, y);
|
|
if (!cell) {
|
|
if (createCellIfEmpty) {
|
|
cell = [];
|
|
this._cellDict.add(x, y, cell);
|
|
}
|
|
}
|
|
return cell;
|
|
}
|
|
|
|
private debugDrawCellDetails(x: number, y: number, cellCount: number, secondsToDisplay = 0.5, textScale = 1) {
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 包装一个Unit32，列表碰撞器字典
|
|
* 它的主要目的是将int、int x、y坐标散列到单个Uint32键中，使用O(1)查找。
|
|
*/
|
|
export class NumberDictionary {
|
|
public _store: Map<string, Collider[]> = new Map<string, Collider[]>();
|
|
|
|
public add(x: number, y: number, list: Collider[]) {
|
|
this._store.set(this.getKey(x, y), list);
|
|
}
|
|
|
|
/**
|
|
* 使用蛮力方法从字典存储列表中移除碰撞器
|
|
* @param obj
|
|
*/
|
|
public remove(obj: Collider) {
|
|
this._store.forEach(list => {
|
|
if (list.contains(obj))
|
|
list.remove(obj);
|
|
})
|
|
}
|
|
|
|
public tryGetValue(x: number, y: number): Collider[] {
|
|
return this._store.get(this.getKey(x, y));
|
|
}
|
|
|
|
/**
|
|
* 清除字典数据
|
|
*/
|
|
public clear() {
|
|
this._store.clear();
|
|
}
|
|
|
|
/**
|
|
* 根据x和y值计算并返回散列键
|
|
* @param x
|
|
* @param y
|
|
*/
|
|
private getKey(x: number, y: number): string {
|
|
return Long.fromNumber(x).shiftLeft(32).or(Long.fromNumber(y, true)).toString();
|
|
}
|
|
}
|
|
|
|
export class RaycastResultParser {
|
|
public hitCounter: number;
|
|
public static compareRaycastHits = (a: RaycastHit, b: RaycastHit) => {
|
|
return a.distance - b.distance;
|
|
};
|
|
|
|
public _hits: RaycastHit[];
|
|
public _tempHit: RaycastHit;
|
|
public _checkedColliders: Collider[] = [];
|
|
public _cellHits: RaycastHit[] = [];
|
|
public _ray: Ray2D;
|
|
public _layerMask: number;
|
|
|
|
public start(ray: Ray2D, hits: RaycastHit[], layerMask: number) {
|
|
this._ray = ray;
|
|
this._hits = hits;
|
|
this._layerMask = layerMask;
|
|
this.hitCounter = 0;
|
|
}
|
|
|
|
/**
|
|
* 如果hits数组被填充，返回true。单元格不能为空!
|
|
* @param cellX
|
|
* @param cellY
|
|
* @param cell
|
|
*/
|
|
public checkRayIntersection(cellX: number, cellY: number, cell: Collider[]): boolean {
|
|
let fraction: number = 0;
|
|
for (let i = 0; i < cell.length; i++) {
|
|
let potential = cell[i];
|
|
|
|
// 管理我们已经处理过的碰撞器
|
|
if (this._checkedColliders.contains(potential))
|
|
continue;
|
|
|
|
this._checkedColliders.push(potential);
|
|
// 只有当我们被设置为这样做时才会点击触发器
|
|
if (potential.isTrigger && !Physics.raycastsHitTriggers)
|
|
continue;
|
|
|
|
// 确保碰撞器在图层蒙版上
|
|
if (!Flags.isFlagSet(this._layerMask, potential.physicsLayer))
|
|
continue;
|
|
|
|
// TODO: rayIntersects的性能够吗?需要测试它。Collisions.rectToLine可能更快
|
|
// TODO: 如果边界检查返回更多数据，我们就不需要为BoxCollider检查做任何事情
|
|
// 在做形状测试之前先做一个边界检查
|
|
let colliderBounds = potential.bounds;
|
|
let fraction = colliderBounds.rayIntersects(this._ray);
|
|
if (fraction <= 1) {
|
|
if (potential.shape.collidesWithLine(this._ray.start, this._ray.end, this._tempHit)) {
|
|
// 检查一下，我们应该排除这些射线，射线cast是否在碰撞器中开始
|
|
if (!Physics.raycastsStartInColliders && potential.shape.containsPoint(this._ray.start))
|
|
continue;
|
|
|
|
// TODO: 确保碰撞点在当前单元格中，如果它没有保存它以供以后计算
|
|
|
|
this._tempHit.collider = potential;
|
|
this._cellHits.push(this._tempHit);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (this._cellHits.length == 0)
|
|
return false;
|
|
|
|
// 所有处理单元完成。对结果进行排序并将命中结果打包到结果数组中
|
|
this._cellHits.sort(RaycastResultParser.compareRaycastHits);
|
|
for (let i = 0; i < this._cellHits.length; i ++){
|
|
this._hits[this.hitCounter] = this._cellHits[i];
|
|
|
|
// 增加命中计数器，如果它已经达到数组大小的限制，我们就完成了
|
|
this.hitCounter ++;
|
|
if (this.hitCounter == this._hits.length)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public reset(){
|
|
this._hits = null;
|
|
this._checkedColliders.length = 0;
|
|
this._cellHits.length = 0;
|
|
}
|
|
}
|
|
}
|