Question

我正在开发一个关于Libgdx的游戏。我游戏的背景只是Gl.clear颜色。如果分数大于5，我想要平滑地改变背景。那么我怎么能用Gl.clearColor来做。或者我需要尝试其他的东西？

Answer 1

您可以查看ColorAction获取灵感，也可以直接使用它：

Color color = new Color(Color.WHITE);
ColorAction colorAction = new ColorAction();

public MyGame() {
    colorAction.setColor(color);
    colorAction.setDuration(2);
    colorAction.setEndColor(Color.RED);
}

public void render(float delta) {
    Gdx.gl.glClearColor(color.r, color.g, color.b, color.a);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    colorAction.act(delta);
}

如果要更改背景颜色，只需使用：

colorAction.reset();
colorAction.setEndColor(Color.BLUE);

Answer 2

这是使用插值的一种方法。应该是不言自明的。

private final Color clearColor = new Color();
private final Color startingClearColor = new Color();
private final Color targetClearColor = new Color();
private float elapsedClearColorChangeTime;
private float clearChangeDuration;

private void changeClearColor(int colorHex, float duration){ //for example 0xff0000ff for Red
    targetClearColor.set(colorHex);
    startingClearColor.set(clearColor);
    elapsedClearColorChangeTime = 0;
    clearChangeDuration = duration;
}

private void updateClearColor(float deltaTime){
    if (elapsedClearColorChangeTime < clearChangeDuration){
        elapsedClearColorChangeTime = Math.min(elapsedClearColorChangeTime + deltaTime, clearChangeDuration);
        clearColor.set(startingClearColor).lerp(targetClearColor, 
            Interpolation.fade.apply(elapsedClearColorChangeTime / clearChangeDuration));
    }
    Gdx.gl.glClearColor(clearColor.r, clearColor.g, clearColor.b, clearColor.a);
}

public void render(float deltaTime){
    updateClearColor(deltaTime);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    //...
}

LibGdx平滑的背景颜色变化

2 个答案: