Question

我对Parallax的（非常基本和粗略的）实现有点问题。基本上我有一个图像应该以与背景略有不同的速率在屏幕上移动。它这样做 - 直到它到达图像的末尾。它似乎循环回到图像的开头 - 但是当它到达图像的末尾时，似乎将位图拉伸到整个屏幕的长度，直到它完全展开 - 然后它自己重置。我无法附上截图（代码不够），但这里是代码。

Init方法：

private void init(Context context) {
    screenSize = new Point();
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    wm.getDefaultDisplay().getSize(screenSize);
    backGroundViewPort = new Rect();
    cityscapeRect = new Rect();
    backGroundViewPort.set(0, 0, 400, 300);

    GGRAssetManager ggrAssetManager = new GGRAssetManager(context);
    background = ggrAssetManager.loadImage("background.jpg");
    cityscape = ggrAssetManager.loadImage("cityscape3.png");
    clouds = ggrAssetManager.loadImage("clouds.png");
    backGroundViewPort.set(0, 0, 400, 300);
}

DoUpdate方法：

     public void doUpdate() {

    Game.getInstance().viewport.set(Math.max(0, (int) (game.getPlayer().getxPos() - screenSize.x / 2)),
            0,
            (int) (game.getPlayer().getxPos() + (screenSize.x / 2)),
            screenSize.y);

    if (backGroundViewPort.right + 1 >= background.getWidth()) {
        backGroundViewPort.left = 0;
        backGroundViewPort.right = 400;
    } else {
        backGroundViewPort.right += 1;
        backGroundViewPort.left += 1;
    }

    if (cityscapeRect.right + 1 >= cityscape.getWidth()) {
        cityscapeRect.left = cityscape.getWidth() - screenSize.x;
        cityscapeRect.right = 0;
    } else {
        cityscapeRect.right += 1;
        cityscapeRect.left += 1;
    }

}

DoDraw方法：

     public void doDraw(Canvas canvas) {
    //PARALLAX
    backGroundRect.set(0, 0, screenSize.x, screenSize.y);
    canvas.drawBitmap(background, backGroundViewPort, backGroundRect, null);
    cityscapeRect.set(0, screenSize.y/2, (screenSize.x), screenSize.y);
    Paint paint = new Paint();
    paint.setAlpha(150);
    canvas.drawBitmap(cityscape, backGroundViewPort, cityscapeRect, paint);
    }

我确定它与矩形有关，但我不知道如何解决它。非常感谢帮助。

转换位图 - Android

0 个答案: