How to scale (zoom and move) to x,y coordinates of Bitmap in PhotoVIew?

At start I have Bitmap and x,y point on the Bitmap.

How to scale, zoom and move image to x,y coordinates of the bitmap?

    int bitmapWidth = bitmap.getWidth();//2418
    int bitmapHeight = bitmap.getHeight();//1889
    float x = 1209f;
    float y = 944f;

    float targetScale = 4f;    
    attacher.setScale(targetScale, x,y, false);//it doesnt work

[antoineFrau]

Ok so I finally understand and make it work. That doesn’t work because I used the animation on the setScale, which was call in an other thread.

mImageView.post(new AnimatedZoomRunnable(getScale(), scale, focalX, focalY));

And in the same time I tried to simulate the movement to re-center the point int the center of the screen.

var event = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, focalX, focalY, 0)
mPhotoView.dispatchTouchEvent(event)

val centerImageX = showResultCoinDetectionPhotoView.displayRect.centerX()
val centerImageY = showResultCoinDetectionPhotoView.displayRect.centerY()

var event = event = MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_MOVE, centerImageX, centerImageY, 0)
mPhotoView.dispatchTouchEvent(event)

But when this part of the code get executed the scale isn’t finished, so the movement can’t happened cause the image is full sized and we can’t drag a full size image.

So to resolve that I remove the animation.

mPhotoView.setScale(5f, focalX, focalY, false)

An other solution could be use a callback or coroutine for the scaling and in the same time do the move, cause we will be in a sequential code part. But the AnimatedZoomRunnable is in another thread so we will go till the :

if (animate) {
       mImageView.post(new AnimatedZoomRunnable(getScale(), scale, focalX, focalY));
}

And go back to the next line of the coroutine.

So actually I don’t have more option to do that. Maybe place a button to be able to center the point in the middle of the screen like in GoogleMap and execute the “simulating drag” when user click ?

Or does there is a way to get notify when AnimatedZoomRunnable is finished ?

Let me know if you found something interesting. Thanks.

[aslansari]

@Kolyall try this, you need to calculate focal points

    int bitmapWidth = bitmap.getWidth();//2418
    int bitmapHeight = bitmap.getHeight();//1889
    float x = 1209f;
    float y = 944f;

    float focalX = x*photoView.getRight()/bitmap.getWidth();
    float focalY = y*photoView.getBottom()/bitmap.getHeight();

    float targetScale = 4f;    
    attacher.setScale(targetScale, focalX, focalY, false);