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PORestrict Bitmap should not cross out particular region from imageview
 

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  1. PORestrict Bitmap should not cross out particular region from imageview
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    <p>I have set bitmap in imageview and doing operation rotating and dragging bitmap on touch mutiple times. I want bitmap set in imageview should not go outside from particular region in imageview. </p> <p>Is there any way to achieve this.</p> <p>Please help me for this..</p> <pre><code>@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.save(); scaleCount=scaleCount+scale; angleCount = addAngle(angleCount, Math.toDegrees(angle)); if (!isInitialized) { int w = getWidth(); int h = getHeight(); position.set(w / 2, h / 2); isInitialized = true; } Paint paint = new Paint(); paint.setFilterBitmap(true); //Log.v("Height and Width", "Height: "+ getHeight() + "Width: "+ getWidth()); transform.reset(); transform.postTranslate(-width / 2.0f, -height / 2.0f); transform.postRotate((float) Math.toDegrees(angle)); transform.postScale(scale, scale); transform.postTranslate(position.getX(), position.getY()); rectangleF = new RectF(); transform.mapRect(rectangleF); //Log.v("VM", "Rect " + rectangleF.left + " " + rectangleF.top + " " + rectangleF.right + " " + rectangleF.bottom); canvas.drawBitmap(bitmap, transform, paint); canvas.restore(); BitmapWidth=BitmapWidth+bitmap.getScaledWidth(canvas); BitmapHeight=BitmapHeight+bitmap.getScaledHeight(canvas); } @Override public boolean onTouch(View v, MotionEvent event) { vca = null; vcb = null; vpa = null; vpb = null; x = event.getX(); y = event.getY(); try { touchManager.update(event); if (touchManager.getPressCount() == 1) { vca = touchManager.getPoint(0); vpa = touchManager.getPreviousPoint(0); position.add(touchManager.moveDelta(0)); } else { if (touchManager.getPressCount() == 2) { vca = touchManager.getPoint(0); vpa = touchManager.getPreviousPoint(0); vcb = touchManager.getPoint(1); vpb = touchManager.getPreviousPoint(1); VMVector2D current = touchManager.getVector(0, 1); VMVector2D previous = touchManager.getPreviousVector(0, 1); float currentDistance = current.getLength(); float previousDistance = previous.getLength(); if (currentDistance-previousDistance != 0) { scale *= currentDistance / previousDistance; } angle -= VMVector2D.getSignedAngleBetween(current, previous); /*angleCount=angleCount+angle;*/ } } invalidate(); } catch(Exception exception) { // Log.d("VM", exception.getMessage()); } return true; } </code></pre>
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