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androidandroid-canvasandroid-bitmapandroid-photoview

Android PhotoView - zoom to previous position (x y coordinates and scale)

I'm using https://github.com/chrisbanes/PhotoView so user can zoom the image and then draw some point.

There is also a function to delete this point. In this case I redraw whole bitmap:

matrix = new Matrix();
canvas.drawBitmap(bmp, matrix, paint);
setImageBitmap(bmp);

But now I want to zoom image to previous position/coordinates.

This should work:

setScale(scale, focalX, focalY, false);

I know the scale but I need focalX, focalY.

How can I get it? Maybe I should somehow calculate it from the

getSuppMatrix(matrix);

But I'm not sure if it's possible and how.

Do you have some tips? Help?

Solution

  • Solved by getting matrix

    getSuppMatrix(matrix);

    before setting new bitmap

    setImageBitmap(bmp);

    And then setting previous matrix

    setSuppMatrix(matrix);