52 lines
1.9 KiB
TypeScript
52 lines
1.9 KiB
TypeScript
module es {
|
||
/** 提供帧定时信息 */
|
||
export class Time {
|
||
/** 游戏运行的总时间 */
|
||
public static totalTime: number = 0;
|
||
/** deltaTime的未缩放版本。不受时间尺度的影响 */
|
||
public static unscaledDeltaTime: number = 0;
|
||
/** 前一帧到当前帧的时间增量，按时间刻度进行缩放 */
|
||
public static deltaTime: number = 0;
|
||
/** 时间刻度缩放 */
|
||
public static timeScale = 1;
|
||
/** DeltaTime可以为的最大值 */
|
||
public static maxDeltaTime = Number.MAX_VALUE;
|
||
/** 已传递的帧总数 */
|
||
public static frameCount = 0;
|
||
/** 自场景加载以来的总时间 */
|
||
public static timeSinceSceneLoad: number = 0;
|
||
private static _lastTime = -1;
|
||
|
||
public static update(currentTime: number) {
|
||
if (currentTime == -1)
|
||
currentTime = Date.now();
|
||
if (this._lastTime == -1)
|
||
this._lastTime = currentTime;
|
||
|
||
let dt = (currentTime - this._lastTime) / 1000;
|
||
if (dt > this.maxDeltaTime)
|
||
dt = this.maxDeltaTime;
|
||
this.totalTime += dt;
|
||
this.deltaTime = dt * this.timeScale;
|
||
this.unscaledDeltaTime = dt;
|
||
this.timeSinceSceneLoad += dt;
|
||
this.frameCount++;
|
||
|
||
this._lastTime = currentTime;
|
||
}
|
||
|
||
public static sceneChanged() {
|
||
this.timeSinceSceneLoad = 0;
|
||
}
|
||
|
||
/**
|
||
* 允许在间隔检查。只应该使用高于delta的间隔值，否则它将始终返回true。
|
||
* @param interval
|
||
*/
|
||
public static checkEvery(interval: number) {
|
||
// 我们减去了delta，因为timeSinceSceneLoad已经包含了这个update ticks delta
|
||
return this.timeSinceSceneLoad / interval > (this.timeSinceSceneLoad - this.deltaTime) / interval;
|
||
}
|
||
}
|
||
}
|