修复捏缩放的边缘 [英] fix the edge of pinch zoom

问题描述

我有一个pinch zoom的源代码，它工作正常!!但我只是有一些问题..我想将imageView固定在手机的边缘..所以当我显示原始图像时，我希望它不能从我的手机边缘滚动..喜欢限制我的缩放..这是我的代码Java：

I have a source code of pinch zoom and it work fine !! But I just have some problem .. I want the imageView to be fixed on the edge of my phone .. so when i show the original image i want it to be not scrollable out of my edge of phone.. like to limite my zoom .. here is my code Java :

public class MainActivity extends Activity implements OnTouchListener {

private static final String TAG = "Touch" ;
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
PointF start = new  PointF();
public static PointF mid = new PointF();

// We can be in one of these 3 states
public static final int NONE = 0;
public static final int DRAG = 1;
public static final int ZOOM = 2;
public static int mode = NONE;

float oldDist;

private float[] matrixValues = new float[9];

@Override
public void onCreate(Bundle savedInstanceState){

  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  ImageView view = (ImageView) findViewById(R.id.imageView);
  view.setOnTouchListener(this);

  //SVG

  ImageView imageView = (ImageView)findViewById(R.id.imageView);
  //Parse the SVG file from the resource
  SVG svg = SVGParser.getSVGFromResource(getResources(), R.raw.caaa);
  //Get a drawable from the parsed SVG and apply to ImageView
  imageView.setImageDrawable(svg.createPictureDrawable());

  //SVG 
}

@Override
public boolean onTouch(View v, MotionEvent event) {

  ImageView view = (ImageView) v;

  switch (event.getAction() & MotionEvent.ACTION_MASK) {

  case MotionEvent.ACTION_DOWN:

      savedMatrix.set(matrix);
      start.set(event.getX(), event.getY());
      Log.d(TAG, "mode=DRAG" );
      mode = DRAG;
      break;

  case MotionEvent.ACTION_POINTER_DOWN:

      oldDist = spacing(event);
      Log.d(TAG, "oldDist=" + oldDist);
      if (oldDist > 10f) {
          savedMatrix.set(matrix);
          midPoint(mid, event);
            mode = ZOOM;
            Log.d(TAG, "mode=ZOOM" );
        }
        break;

  case MotionEvent.ACTION_MOVE:

        if (mode == DRAG) {

            matrix.set(savedMatrix);
            matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
        }
        else if (mode == ZOOM) {

            float newDist = spacing(event);
            Log.d(TAG, "newDist=" + newDist);
            if (newDist > 10f) {

                matrix.set(savedMatrix);
                float scale = newDist / oldDist;
                matrix.postScale(scale, scale, mid.x, mid.y);
            }
        }
        break;

  case MotionEvent.ACTION_UP:
  case MotionEvent.ACTION_POINTER_UP:

        mode = NONE;
        Log.d(TAG, "mode=NONE" );
        break;
    }

    // Perform the transformation
    view.setImageMatrix(matrix);

    return true; // indicate event was handled
  }

  private float spacing(MotionEvent event) {
    float x = event.getX(0) - event.getX(1);
    float y = event.getY(0) - event.getY(1);
    return FloatMath.sqrt(x * x + y * y);
  }

  private void midPoint(PointF point, MotionEvent event) {

    float x = event.getX(0) + event.getX(1);
    float y = event.getY(0) + event.getY(1);
    point.set(x / 2, y / 2);
  }

}

thnx这么多你的帮助很快^ w ^

thnx so much for ur soon help ^w^

推荐答案

这篇关于修复捏缩放的边缘的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！