/**
 * 变换操作
 */
public class TransformView extends View {

    private Paint mPaint;

    public TransformView(Context context) {
        this(context, null);
    }

    public TransformView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public TransformView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mP