如何随机设定PathModifier的坐标LoopEntityModifier的开端？ [英] How to set PathModifier's coordinates randomly in start of LoopEntityModifier?

问题描述

我创建使用AndEngine库动态壁纸的服务。在屏幕上出现的是，从左边飞多次到右鸟雪碧。我使用LoopEntityModifier和PathModifier的解决方案。鸟是codeD随机开始Y位置每次它从左边的屏幕上显示出来。

I created a live wallpaper service using AndEngine library. On screen there is a bird Sprite that flying repeatedly from the left to right. I'm using LoopEntityModifier and PathModifier for the solution. The bird is coded to start randomly on Y-position everytime it shows up from the left screen.

在code是这样的：

public class MyLiveWallpaperService extends BaseLiveWallpaperService {
    private AnimatedSprite birdSprite;
    ...

    public Scene onLoadScene() {
        ...
        float[] coordY = generateRandomCoordY();  // my custom function to generate random array of Y-coordinates
        Path path = new Path(coordX, coordY);  // set the coordinate to Path object

        // register the modifiers (for the one who is curious, 1st argument of PathModifier is the duration, 
        // but it has nothing to do with the question)

        birdSprite.registerEntityModifier(new LoopEntityModifier(new PathModifier(10, path)));
        ...
    }
}

问题是路径的Y坐标值不能再更改时LoopEntityModifier＆放大器; PathModifier已运行。我想每次循环开始，我可以重新设置新路径的Y坐标值。

The problem is the Path's Y-coordinates value cannot be changed anymore when the LoopEntityModifier & PathModifier has run. I want everytime the loop started, I can set the new Path's Y-coordinate value again.

推荐答案

我觉得你可以通过覆盖onModifierFinished（）和创造与改变的路径中的新PathModifier解决这个问题。它看起来是这样的：

I think you can get around this problem by overriding onModifierFinished() and creating a new PathModifier with the changed path. It would look something like this:

public LoopEntityModifier createModifier(Path path) {
    return new LoopEntityModifier(new PathModifier(path)) {
        @Override
        public void onModifierFinished(final IModifier<IEntity> pEntityModifier, final IEntity pEntity) {
            birdSprite.registerEntityModifier(createModifier(path));
        }
    }
}

birdSprite.registerEntityModifier(createModifier());

此仅当onModifierFinished作品（）称为在每个循环结束时

This only works if onModifierFinished() is called at the end of every loop.

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