“远古帝国2”的片头图片抖动代码

public static final void drawEffect(Graphics g, int current,
                                    int sum, int type, Image img, int x, int y,
                                    int t) {
    int width;
    int height;
    if (type == 0) {
        width = img.getWidth();
        height = img.getHeight();
    } else {
        height = img.getHeight();
        width = img.getWidth();
    }
    int halfWidth = width / 2;
    int wholeHeight = height / 1;
    int currentWidth = (width * current) / sum;
    int l3 = (width * (sum - current)) / (sum * 4); //每改变一个记数点x的改变量，
    //举例，在LOGO的变化中为 width*current
    int currentAngle = (360 * current) / sum;
    //每增加一行的像素，角度增加量,t 决定了有几个弧形循环
    int angle = (360 * t) / wholeHeight;
    for (int i = 0; i < wholeHeight; i++) {
        int moveX = l3 * cos(currentAngle) >> 10;
        if (type == 0) {
            g.setClip(((x + halfWidth) - currentWidth / 2) + moveX, y + i * 1,
                      currentWidth, 1);
            g.drawImage(img, x + moveX, y, 20);
        } else {
            g.setClip(x + i * 1, ((y + halfWidth) - currentWidth / 2) + moveX,
                      1, currentWidth);
            g.drawImage(img, x, y + movex, 20);
        }
        currentAngle += angle;
    }
}