英文:
One time thread in libgdx after render loop starts
问题
有没有可能在渲染方法后立即运行一个线程，只在渲染循环调用它一次，因为渲染循环会在每次迭代中调用它。这是我的线程：
new Thread(new Runnable() {float time=0;@Overridepublic void run() {while(redPos<10) {time += Gdx.graphics.getDeltaTime();redPos+=(int)time;}}}).start();
我对线程不是很熟悉，所以不知道正确的做法。如果我做错了，请纠正我。
更新：我通过将 redPos 增量移动到渲染方法中使其正常工作，如下所示：
float time = 0;void render(){if(redPos<10){time += Gdx.graphics.getDeltaTime();redPos+=(int)time;}batch.begin();batch.draw(ball, redPos, 5);batch.end();}
为精灵使用线程来进行动画处理是一个不好的主意，因为它会与渲染线程不同步。
英文:
Is it possible to run a thread just after render method only once since render loop will call it in every iteration. This is my thread:
new Thread(new Runnable() {float time=0;@Overridepublic void run() {while(redPos<10) {time += Gdx.graphics.getDeltaTime();redPos+=(int)time;}}}).start();
I am not very much acquainted with threads so dont know proper way of doing it.
Please correct me if I am going wrong
Update: I got it working by shifting redPos increment to render method like this-
float time = 0;void render(){if(redPos<10){time += Gdx.graphics.getDeltaTime();redPos+=(int)time;}batch.begin();batch.draw(ball, redPos, 5);batch.end();}
Using Thread for animating sprite was a bad idea as it will be desynced with render thread.
答案1
得分: 0
你可能希望避免在这个任务中使用线程。您可以创建一个继承自Sprite的类，并编写一些代码，以在draw方法中逐渐改变Sprite的缩放。
public class MySprite extends Sprite {private boolean doScale;private float scaleBy;private float scaleTime;private float timeElapsed;private float progress;private float lastProgress;public MySprite(Texture texture) {super(texture);}public void scaleTo(float scaleTo, float time){scaleBy(scaleTo - getScaleX(), time);}public void scaleBy(float scaleBy, float time){this.scaleBy = scaleBy;doScale = true;scaleTime = time;timeElapsed = 0;lastProgress = 0;setOriginCenter();}@Overridepublic void draw(Batch batch) {if (doScale) {timeElapsed += Gdx.graphics.getDeltaTime();progress = timeElapsed / scaleTime;progress = progress > 1 ? 1 : progress;float progressDelta = progress - lastProgress;float scaleBy = this.scaleBy * progressDelta;setScale(getScaleX() + scaleBy, getScaleY() + scaleBy);lastProgress = progress;if (progress == 1)doScale = false;}super.draw(batch);}}
然后在MySprite中使用scaleTo()或scaleBy()方法...
@Overridepublic void create() {.........mySprite = new MySprite(texture);mySprite.scaleTo(2, 1); // 在1秒内缩放到200％}
虽然libGDX已经为此提供了Actions，但您可能要考虑使用Actor
@Overridepublic void create() {.........imageActor = new Image(texture);imageActor.addAction(Actions.scaleTo(2, 2, 1)); // 在1秒内缩放到200％}
英文:
You may wan't to avoid threads for this task. You can create a class that extends Sprite and write some code that changes the scale of the Sprite progressively in the draw method.
public class MySprite extends Sprite {private boolean doScale;private float scaleBy;private float scaleTime;private float timeElapsed;private float progress;private float lastProgress;public MySprite(Texture texture) {super(texture);}public void scaleTo(float scaleTo, float time){scaleBy(scaleTo - getScaleX(),time);}public void scaleBy(float scaleBy, float time){this.scaleBy = scaleBy;doScale = true;scaleTime = time;timeElapsed = 0;lastProgress = 0;setOriginCenter();}@Overridepublic void draw(Batch batch) {if(doScale){timeElapsed += Gdx.graphics.getDeltaTime();progress = timeElapsed/scaleTime;progress = progress > 1?1: progress;float progressDelta = progress - lastProgress;float scaleBy = this.scaleBy *progressDelta;setScale(getScaleX()+scaleBy,getScaleY()+scaleBy);lastProgress = progress;if(progress == 1)doScale = false;}super.draw(batch);}}
Then use the method scaleTo() or scaleBy() in MySprite...
@Overridepublic void create () {.........mySprite = new MySprite(texture);mySprite.scaleTo(2,1);//Scale to 200% in 1 seconds}
Although libGdx already provide Actions for this, you may want to consider the use of an Actor
@Overridepublic void create () {.........imageActor = new Image(texture);imageActor.addAction(Actions.scaleTo(2,2,1));//Scale to 200% in 1 seconds}
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