在Android中旋转视图时调整视图大小

Question

我正在开发一个示例应用程序，它允许调整拖动视图的大小 选择旋钮。在不旋转视图时，调整大小可以正常工作。当。。。的时候 视图旋转，如果我们调整视图大小，它会偏移一定量。一世 需要使视图的对角保持在原始位置 而视图正在调整大小。任何人都可以帮助我理解这是怎么回事 在android中实现。调整大小的代码段如下：

public void resize(float dx, float dy, SelectionView.KnobTypes selectedKnob) {
    float newDx = dx;
    float newDy = dy;
    FrameLayout.LayoutParams params;
    float viewWidth, viewHeight, ratio, newWidth, newHeight;
    viewWidth = getWidth();
    viewHeight = getHeight();
    ratio = 1;
    switch (selectedKnob) {
        case eLeftTop:
            newWidth = viewWidth - dx;
            newHeight = viewHeight - dy;

            if (newWidth <= mKnobRadius * 4 || newHeight <= mKnobRadius * 4) {
                break;
            }

            if (viewWidth > viewHeight) {
                if (viewHeight != 0) {
                    ratio = viewWidth / viewHeight;
                }
                newWidth = newHeight * ratio;
            } else {
                if (viewWidth != 0) {
                    ratio = viewHeight / viewWidth;
                }
                newHeight = newWidth * ratio;
            }
            params = new FrameLayout.LayoutParams(Math.round(newWidth),
                    Math.round(newHeight));
            setLayoutParams(params);


            newDx = Math.round(newWidth) - Math.round(viewWidth);
            newDy = Math.round(newHeight) - Math.round(viewHeight);

            setTranslationX(getTranslationX() - newDx);
            setTranslationY(getTranslationY() - newDy);
            break;

        case eTopRight:
            newWidth = viewWidth + dx;
            newHeight = viewHeight - dy;

            if (newWidth <= mKnobRadius * 4 || newHeight <= mKnobRadius * 4) {
                break;
            }

            if (viewWidth > viewHeight) {
                if (viewHeight != 0) {
                    ratio = viewWidth / viewHeight;
                }
                newWidth = newHeight * ratio;
            } else {
                if (viewWidth != 0) {
                    ratio = viewHeight / viewWidth;
                }
                newHeight = newWidth * ratio;
            }
            params = new FrameLayout.LayoutParams(Math.round(newWidth),
                    Math.round(newHeight));
            setLayoutParams(params);
            newDx = Math.round(newWidth) - Math.round(viewWidth);
            newDy = Math.round(newHeight) - Math.round(viewHeight);
            setTranslationY(getTranslationY() - newDy);
            break;

        case eRightBottom:
            newWidth = viewWidth + dx;
            newHeight = viewHeight + dy;

            if (newWidth <= mKnobRadius * 4 || newHeight <= mKnobRadius * 4) {
                break;
            }

            if (viewWidth > viewHeight) {
                if (viewHeight != 0) {
                    ratio = viewWidth / viewHeight;
                }
                newWidth = newHeight * ratio;
            } else {
                if (viewWidth != 0) {
                    ratio = viewHeight / viewWidth;
                }
                newHeight = newWidth * ratio;
            }
            params = new FrameLayout.LayoutParams(Math.round(newWidth),
                    Math.round(newHeight));
            setLayoutParams(params);
            break;

        case eLeftBottom:
            newWidth = viewWidth - dx;
            newHeight = viewHeight + dy;

            if (newWidth <= mKnobRadius * 4 || newHeight <= mKnobRadius * 4) {
                break;
            }

            if (viewWidth > viewHeight) {
                if (viewHeight != 0) {
                    ratio = viewWidth / viewHeight;
                }
                newWidth = newHeight * ratio;
            } else {
                if (viewWidth != 0) {
                    ratio = viewHeight / viewWidth;
                }
                newHeight = newWidth * ratio;
            }
            params = new FrameLayout.LayoutParams(Math.round(newWidth),
                    Math.round(newHeight));
            setLayoutParams(params);
            newDx = Math.round(newWidth) - Math.round(viewWidth);
            newDy = Math.round(newHeight) - Math.round(viewHeight);

            setTranslationX(getTranslationX() - newDx);
            break;

        default:
            break;
    }
}

dx和dy是鼠标移动的偏移量，选中的旋钮是当前被拖动的旋钮。

将工作样本上传到此github仓库： https://github.com/vivekrk/resizesample.git