android旋转图像

android旋转图像,android,image,spinning,Android,Image,Spinning,我试图创建两个旋转的轮子,就像在滑轮中一样,所以每次连接的绳子移动时,两个滑轮都会旋转。我尝试了两种方法: 1) 在View类的onDraw()方法中使用Matrix.postRotate,该方法调用以下内容: private void drawSpinningWheel(Canvas canvas) { try { canvas.save(); Bitmap bitmapOrg = null; int iDrawabl

我试图创建两个旋转的轮子,就像在滑轮中一样,所以每次连接的绳子移动时,两个滑轮都会旋转。我尝试了两种方法:

1) 在View类的onDraw()方法中使用Matrix.postRotate,该方法调用以下内容:

private void drawSpinningWheel(Canvas canvas)
{
    try
    {
        canvas.save();

            Bitmap bitmapOrg = null;

        int iDrawable = R.drawable.spinning_button;

        bitmapOrg = BitmapFactory.decodeResource(getResources(), iDrawable);

        if(bitmapOrg != null)
        {
            int width = bitmapOrg.getWidth(); 
            int height = bitmapOrg.getHeight(); 
            int newWidth = 24; 
            int newHeight = 24; 

            // calculate the scale - in this case = 0.4f 
            float scaleWidth = ((float) newWidth) / width; 
            float scaleHeight = ((float) newHeight) / height; 

            // createa matrix for the manipulation 
            Matrix matrix = new Matrix(); 
            // resize the bit map 
            matrix.postScale(scaleWidth, scaleHeight); 
            matrix.postRotate((float) mDegrees++);

            Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, 
                    width, height, matrix, true); 

            canvas.drawBitmap(resizedBitmap, matrix, null);

        }

        canvas.restore();
    }
    catch(Exception e)
    {
        Log.e(TAG + "drawSpinningWheel", e.getMessage());
    }

}
但看起来图像不仅会旋转,还会绕另一个轴旋转

2) 使用SurfaceView和一个单独的线程,在run()中调用:

    private void doDraw(Canvas canvas) {
        // Draw the background image. Operations on the Canvas accumulate
        // so this is like clearing the screen.
        canvas.drawBitmap(mBackgroundImage, 0, 0, null);

        int yTop = mCanvasHeight - ((int) mY + mSpinningWheelImageHeight / 2);
        int xLeft = (int) mX - mSpinningWheelImageWidth / 2;

我让纺车运转起来,但我不能再加一个纺车。我甚至试图为第二个纺车创建另一条线,但只显示了一条。有人能给我指出正确的方向吗?谢谢

3) 好的,现在我也尝试了旋转动画:

公共类GraphicsView扩展视图 { 私有静态最终字符串引号= “再也没有人使用Java了。它是一个巨大的重量级游戏。”

}


但结果与画布相似。旋转,我能够使第一个图像旋转良好,但第二个图像将简单地围绕第一个图像旋转,尽管我注意到第二个图像实际上也在旋转。看起来第二张图片我需要一个单独的视图,我希望避免这种情况,因为我不确定如何使轮子旋转,但连接的绳子不旋转。

你尝试过旋转动画吗?

你尝试过旋转动画吗?查看我的问题和答案,我想这就是你(和我)的想法你在找。。。


我放了三个动画,我的标志文字和我的标志图标。然后我在文本上做了一个负旋转,在图标上做了一个正旋转。它很简单但很酷。我的问题的答案有代码清单。

查看我的问题及其答案,我想这就是你(和我)正在寻找的。。。


我放了三个动画,我的标志文字和我的标志图标。然后我在文本上做了一个负旋转,在图标上做了一个正旋转。它很简单但很酷。我问题的答案有代码清单。

我有,它只围绕左上角旋转。我找不到设置,无法使其围绕我的可绘图设备的中心旋转(旋转)。你能提供一些细节吗?我提供了,它只围绕左上角旋转。我找不到设置,无法使其围绕我的可绘图设备的中心旋转(旋转)。你能提供一些细节吗?
        // Draw the ship with its current rotation
        canvas.save();
        canvas.rotate((float) mHeading++, (float) mX, mCanvasHeight
                - (float) mY);

            mSpinningWheelImage.setBounds(xLeft, yTop, xLeft + mSpinningWheelImageWidth, yTop
                    + mSpinningWheelImageHeight);
            mSpinningWheelImage.draw(canvas);


        canvas.restore();
    }
private Animation anim;
private Animation anim2;

private Bitmap jobs;
private Bitmap wheel;

private int jobsXOffset;        
private int jobsYOffset;

private int wheelXOffset;        
private int wheelYOffset;

public GraphicsView(Context context) 
{
    super(context);
    jobs = BitmapFactory
    .decodeResource(getResources(), R.drawable.spinning_button);

    jobsXOffset = jobs.getWidth() / 2;
    jobsYOffset = jobs.getHeight() / 2;

    wheel = BitmapFactory
    .decodeResource(getResources(), R.drawable.wheel);

    wheelXOffset = jobs.getWidth() / 2;
    wheelYOffset = jobs.getHeight() / 2;


}

private void createAnim(Canvas canvas) 
{
    anim = new RotateAnimation(0, 360, canvas.getWidth() / 2, canvas
            .getHeight() / 2);
    anim.setRepeatMode(Animation.INFINITE);
    anim.setRepeatCount(Animation.INFINITE);
    anim.setDuration(10000L);
    anim.setInterpolator(new AccelerateDecelerateInterpolator());

    startAnimation(anim);
}

private void createAnim2(Canvas canvas) 
{
    anim2 = new RotateAnimation(0, 360, canvas.getWidth() / 2+30, canvas
            .getHeight() / 2);
    anim2.setRepeatMode(Animation.INFINITE);
    anim2.setRepeatCount(Animation.INFINITE);
    anim2.setDuration(10000L);
    anim2.setInterpolator(new AccelerateDecelerateInterpolator());

    startAnimation(anim);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    // creates the animation the first time
    if (anim == null) {
        createAnim(canvas);
    }

    int centerX = canvas.getWidth() / 2;
    int centerY = canvas.getHeight() / 2;

    canvas.drawBitmap(jobs, centerX - jobsXOffset,
            centerY - jobsYOffset, null);

    canvas.drawBitmap(wheel, centerX - wheelXOffset + 30,
            centerY - wheelYOffset, null);

}