Zooming out to last Zoomedin-Status

[Manuel Brnjic <ma...@gmail.com>]

Hello,

I am zooming into a choosen Rect in a SVG-Map:

// Zoom translate
AffineTransform at = new AffineTransform();
at.scale(scale, scale);
at.translate(-xStart, -yStart);

at.concatenate(svgCanvas.getRenderingTransform());
svgCanvas.setRenderingTransform(at);


So now if i zoom a few times in, i want to zoom out. I want to zoom out back
to the last zoomed-in status. I tried it like this:

//width & height of the last choosen rect (choosen area for zooming in)
int dx = releasedX - pressedX;
int dy = releasedY - pressedY;

//Zoom-out
AffineTransform at = new AffineTransform();

at.translate(pressedX+dx/2, pressedY+dy/2);
at.scale(zoomScale.getLast(), zoomScale.getLast()); //zoomScale is a
LinkedList where the Scalings of the last zoom-in actions are being saved
at.translate(-pressedX-dx/2, -pressedY-dy/2);

svgCanvas.setRenderingTransform(at);

//removing the last zoomScale
zoomTimes.removeLast();


So my problem is: when i zoom in, it works very well.
But when i try to zoomout (back to the last zoomed-in status), it doesent
zoomes me exactly to that area back!
It's zooming a little bit to much down and to the left side
instead of the exact choosen area from the last zoomed-in status.

Can anybody help me? Has anyone coded something like that? Maybe i can use
some code samples from yours..

greetings, Manuel