Matrix 旋转图片,该怎么解决

Matrix 旋转图片

Java code

Matrix xMatrix = new Matrix();        xMatrix.set(mBaseMatrix);        xMatrix.setRotate(-90);        setImageMatrix(xMatrix);        float v[] = new float[9];        xMatrix.getValues(v);        mBaseMatrix.setValues(v);

Java code

public class BeadplateMiddle extends View {      private Bitmap mBitmap = null;//声明Bitmap对象      private int x  = 300;      private int y = 100;      //private float angleA = 0.0f;//声明轴心A转动      private float angleB = 0.0f;//声明轴心B转动角度      private Matrix mMatrix = new Matrix();//构建矩阵Matrix对象      public BeadplateMiddle(Context context) {          super(context);          //装载资源          mBitmap =((BitmapDrawable) getResources().getDrawable(R.drawable.bedplate)).getBitmap();              //开启线程          new Thread(new DrawThread()).start();      }      //系统IOC开始绘制      @Override      protected void onDraw(Canvas canvas) {          super.onDraw(canvas);          Paint mPaint = new Paint();          mPaint.setColor(Color.RED);          mPaint.setAntiAlias(true);          canvas.drawCircle(x, y, 12, mPaint);          mMatrix = getMyMatrix(mMatrix,angleB, x, y);          canvas.drawBitmap(mBitmap, mMatrix, null);      }      /**     * 动态构建旋转矩阵Matrix对象     * @param matrix  需要计算的矩阵     * @param canvas  画布     * @param degrees 图片旋转的角度，正值为顺时针，负值为逆时针     * @param pivotX  轴心的X坐标     * @param pivotY  轴心的Y坐标     */      private Matrix getMyMatrix(Matrix matrix ,float degrees,int pivotX , int pivotY ){          //重置Matrix          matrix.reset();          float cosValue = (float) Math.cos(Math.PI/(180/degrees));            float sinValue = (float) Math.sin(Math.PI/(180/degrees));            //设置旋转矩阵值          matrix.setValues(                    new float[]{                            cosValue, -sinValue, pivotX,                            sinValue, cosValue, pivotY,                            0, 0, 1});          return matrix;      }      @Override      public boolean onKeyDown(int keyCode, KeyEvent event) {          if(keyCode == KeyEvent.KEYCODE_DPAD_LEFT){              x --;          }else if(keyCode == KeyEvent.KEYCODE_DPAD_RIGHT){              x ++;          }else if(keyCode == KeyEvent.KEYCODE_DPAD_UP){              y --;          }else if(keyCode == KeyEvent.KEYCODE_DPAD_DOWN){              y ++;          }else if(keyCode == KeyEvent.KEYCODE_DPAD_CENTER){              angleB ++;          }          return true;      }      private class DrawThread implements Runnable{          @Override          public void run() {              while(!Thread.currentThread().isInterrupted()){                  try {                      Thread.sleep(500);                  } catch (Exception e) {                      Thread.currentThread().interrupt();                  }                  //使用PostInvalidate可以直接在线程中更新视图                  postInvalidate();              }          }      }  }
[解决办法]
#4楼的意思是是像这样

Java code
Matrix xMatrix = new Matrix();while(true){        xMatrix.set(mBaseMatrix);        xMatrix.setRotate(-90);        setImageMatrix(xMatrix);        float v[] = new float[9];        xMatrix.getValues(v);        mBaseMatrix.setValues(v);}