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请帮助旋转 2 面图像(如硬币) - 换面动画,当第一个图像可见时,第二个不可见。当我旋转图像时,直到旋转角度小于 90 度,我显示第一张图像,否则显示第二张图像。

现在,它在 Y 轴 (A) 上旋转,但我需要在轴上旋转图像 - 旋转图像的中心 (B)。

转换:

long aniAngle = (System.currentTimeMillis() - animationStart)*180/ANIMATION_TIME;
     aniCamera.save();

            if(aniAngle <= 90)
            {                   
                aniCamera.rotateY(aniAngle); // angle of current rotation
                aniCamera.getMatrix(aniMatrix);
                                    aniCamera.restore();

                int centerX = x + image.getWidth()/2;
                int centerY = y + iamge.getHeight()/2;              

                aniMatrix.preTranslate(-centerX, -centerY);
                aniMatrix.postTranslate(centerX, centerY);
                                    canvas.save();
                                    canvas.concat(aniMatrix);
  Bitmap image = angle < 90 ? image1 : image2;
 if(image == image2)
    angle = 180 - angle; // second image goes from rotated state to normal - degrees of rotation should decrease during animation

c.translate(x + image.getWidth()/2, y + cover.getHeight()/2); // 图像左上角坐标 (x,y)

        c.rotate(angle); // angle of rotation non animated image        

        c.drawBitmap(image, -image.getWidth()/2, -image.getHeight()/2, null);

http://i.stack.imgur.com/TCRde.png

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