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POoffset of HitArea after zooming and scrolling
 

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    <p>What will be the offset of the getHitRect after zooming and scrolling. Offset of the hit area after zoom can be calculated - (event.getX() / ZoomLayout.mScaleFactor + ZoomLayout.mClipBound.left) But i have not still figured out the offset of hit area after zooming and scrolling.</p> <pre><code>public class ZoomLayout extends RelativeLayout implements OnDoubleTapListener, OnGestureListener{ //ScalingFactor i.e. Amount of Zoom static float mScaleFactor = 1.0f; // Maximum and Minimum Zoom private static float MIN_ZOOM = 1.0f; private static float MAX_ZOOM = 2.0f; //Different Operation to be used private final int NONE_OPERATION=0; private final int DRAG_OPERATION=1; private final int ZOOM_OPERATION=2; private float mWidth= 1280; private float mHeight=800; // Mode to select the operation private int mode; //Track X and Y coordinate of the finger when it first touches the screen private float mInitialX = 0f; private float mInitialY = 0f; // Track the Bound of the Image after zoom to calculate the offset static Rect mClipBound; // mDetector to detect the scaleGesture for the pinch Zoom private ScaleGestureDetector mDetector; // mDoubleTapDetector to detect the double tap private GestureDetector mDoubleTapDetector; //Pivot point for Scaling static float gx=0,gy=0; boolean mdrag=false,mZoom=false; public ZoomLayout(Context context, AttributeSet attrs) { super(context, attrs); setWillNotDraw(false); mClipBound = new Rect(); // Intialize ScaleGestureDetector mDetector = new ScaleGestureDetector(getContext(), new ZoomListener()); mDoubleTapDetector = new GestureDetector(context,this); mDoubleTapDetector.setOnDoubleTapListener(this); } public ZoomLayout(Context context) { super(context); setWillNotDraw(false); mClipBound = new Rect(); // Intialize ScaleGestureDetector mDetector = new ScaleGestureDetector(getContext(), new ZoomListener()); mDoubleTapDetector = new GestureDetector(context,this); mDoubleTapDetector.setOnDoubleTapListener(this); } @Override public boolean onTouchEvent(MotionEvent event) { // Handles all type of motion-events possible switch(event.getAction() ) { case MotionEvent.ACTION_DOWN: // Event occurs when the first finger is pressed on the Screen Log.d("ZoomPrint", "Event: Action_Down " ); mInitialX = event.getX(); mInitialY = event.getY(); break; case MotionEvent.ACTION_POINTER_DOWN: //Event occurs when the second finger is pressed down Log.d("ZoomPrint", "Event: Action_Pointer_Down " ); // If second finger is pressed on the screen with the first set the Mode to Zoom operation mode=ZOOM_OPERATION; break; case MotionEvent.ACTION_POINTER_UP: Log.d("ZoomPrint", "Event: Action_Pointer_UP " ); mdrag=true; case MotionEvent.ACTION_UP: //Event occurs when all the finger are taken of the screen Log.d("ZoomPrint", "Event: Action_UP " ); //If all the fingers are taken up there will be no operation mode = NONE_OPERATION; mdrag=false; break; } // give the event to the mDetector to get the scaling Factor mDetector.onTouchEvent(event); // give the event to the mDoubleTapDetector for the doubleTap mDoubleTapDetector.onTouchEvent(event); if(!mdrag) invalidate(); return true; } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { onTouchEvent(ev); return super.onInterceptTouchEvent(ev); // return true; } @Override public ViewParent invalidateChildInParent(int[] location, Rect dirty) { return super.invalidateChildInParent(location, dirty); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int count = getChildCount(); for(int i=0;i&lt;count;i++){ View child = getChildAt(i); if(child.getVisibility()!=GONE){ RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)child.getLayoutParams(); child.layout( (int)(params.leftMargin ), (int)(params.topMargin ), (int)((params.leftMargin + child.getMeasuredWidth()) ), (int)((params.topMargin + child.getMeasuredHeight())) ); } } } @Override protected void dispatchDraw(Canvas canvas) { //Save the canvas to set the scaling factor returned from detector canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.scale(mScaleFactor, mScaleFactor,gx,gy); super.dispatchDraw(canvas); mClipBound = canvas.getClipBounds(); canvas.restore(); } private class ZoomListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { @Override public boolean onScale(ScaleGestureDetector detector) { // getting the scaleFactor from the detector mScaleFactor *= detector.getScaleFactor(); // gives the scaling factor from the previous scaling to the current // Log.d("ZoomPrint", "detector scaling Factor" + mScaleFactor); gx = detector.getFocusX(); gy = detector.getFocusY(); // Limit the scale factor in the MIN and MAX bound mScaleFactor= Math.max(Math.min(mScaleFactor, MAX_ZOOM),MIN_ZOOM); // Log.d("ZoomPrint", "Bounded scaling Factor" + mScaleFactor); /*//Force canvas to redraw itself only if the one event is to happen (say Zooming only ) else do not invalidate here for multi operations As what we de for scrolling or panning will not reflect here. So we will add this in onDraw method invalidate();*/ // Here we are only zooming so invalidate has to be done // invalidate(); // requestLayout(); // we have handle the onScale return true; } } @Override public boolean onDoubleTap(MotionEvent e) { // Make the mScaleFactor to its normal value if(mScaleFactor&gt;1.0f) { mScaleFactor=1.0f; } // Force the canvas to redraw itself again as the changes has been occured. invalidate(); requestLayout(); return false; } @Override public boolean onDoubleTapEvent(MotionEvent e) { // Log.d("ZoomPrint", "OnDoubleTapEvent"); return false; } @Override public boolean onSingleTapConfirmed(MotionEvent e) { // Log.d("ZoomPrint", "OnSingleTap"); return false; } @Override public boolean onDown(MotionEvent e) { // TODO Auto-generated method stub return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { return false; } @Override public void onLongPress(MotionEvent e) { } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { int distX= (int) distanceX, distY =(int) distanceY; //Log.d("Print"," X " + this.mClipBound.left +" Y " + this.mClipBound.right + " b "+ this.mClipBound.bottom + " g" + this.mClipBound.top) ; Log.d("Print", "Scroll X " + distanceX + " Y " + distanceY); if(this.mClipBound.left&lt;=0) this.scrollTo(-280, 0); else if(this.mClipBound.top&lt;=0) this.scrollTo(0, -250); else if (this.mClipBound.right&gt;=1047) this.scrollTo(280, 0); else if (this.mClipBound.bottom&gt;=800) this.scrollTo(0, 250); else this.scrollBy((int)distanceX,(int)distanceY); return true; } @Override public void onShowPress(MotionEvent e) { } @Override public boolean onSingleTapUp(MotionEvent e) { return false; } </code></pre>
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