Hello,
I'm developing a small image editor. Basically, the user can insert
some images in a canvas, and through interaction with the fingers
moving them around. I'm having some trouble with the Zooming. I have
followed the idea of this tutorial (http://blogs.sonyericsson.com/wp/
2010/05/18/android-one-finger-zoom-tutorial-part-1) to use a bitmap,
and to apply transformations to two rectangles. Afterwards, if we draw
the bitmap over the canvas with
`android.graphics.Canvas.drawBitmap(Bitmap bitmap, Rect src, Rect dst,
Paint paint)`, the transformation is applied. So far, is not working
for me.
I store all the images in an array of images, `ColorBall`. When I
detect there is a zoom gesture, and only if it was over a certain
image (this works so far), I apply over that image the transformations
(the values are dummy, just wanted to check if it works):
colorballs.get(balID-1).getmRectDst().left = getLeft();
colorballs.get(balID-1).getmRectDst().top = getTop();
colorballs.get(balID-1).getmRectDst().right = getRight();
colorballs.get(balID-1).getmRectDst().bottom = getBottom();
colorballs.get(balID-1).getmRectSrc().left += 10;
colorballs.get(balID-1).getmRectSrc().top += 10;
colorballs.get(balID-1).getmRectSrc().right += 10;
colorballs.get(balID-1).getmRectSrc().bottom += 10;
On the OnDraw event, for all the pictures in the array I locate them,
and then I scale them using the rectangles. So far, the part of
scaling is not working:
//draw the balls on the canvas
for (ColorBall ball : colorballs) {
canvas.drawBitmap(ball.getBitmap(), ball.getX(), ball.getY(),
null);
canvas.drawBitmap(ball.getBitmap(), ball.getmRectSrc(),
ball.getmRectDst(), mPaintBalls);
}
Any suggestion of what can I be missing here? Thanks in advance!
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