> > I am trying to programatically zoom into an area which i know the
absolute
> > coordinates of.
> > I searched for a way to do that, and only found this:
> >
> > AffineTransform at = new AffineTransform();
> > at.scale(scale, scale);
> > at.translate(-xStart, -yStart);
> >
> > at.concatenate(canvas.getRenderingTransform());
> > canvas.setRenderingTransform(at);
> >
> > but this does not really help me since i know the exact coordinates
(x1,y1,
> > x2,y2) of the area i want to zoom in to.
>
> That's exactly AffineTransform do. What you need is to calculate the
> current view transform compare with the exact coordinate you want to
> zoom. Then just transform scale and transform translate.
>
I don't seem to be able to do it right. after the transfor, i get a white
page with nothing in it. it seems it zooms to an area that is different than
what i want.
If you have an example of doing it the right way, I appreciate it if you can
please post here.
or if you can look at the code below, and tell me where did i go wrong...
in this code, i tried to follow what is done in
org.apache.batik.swing.gvt.AbstractZoomInteractor.mouseReleased
double x1= my value
double y1= my value
double x2= my value
double y2= my value
double xCurrent = x2;
double yCurrent = y2;
double xStart = x1;
double yStart = y1;
if ((xCurrent - xStart) != 0 &&
(yCurrent - yStart) != 0) {
int dx = xCurrent - xStart;
int dy = yCurrent - yStart;
if (dx < 0) {
dx = -dx;
xStart = xCurrent;
}
if (dy < 0) {
dy = -dy;
yStart = yCurrent;
}
Dimension size = c.getSize();
// Zoom factor
float scaleX = size.width / (float)dx;
float scaleY = size.height / (float)dy;
float scale = (scaleX < scaleY) ? scaleX : scaleY;
// Zoom translate
AffineTransform at = new AffineTransform();
at.scale(scale, scale);
at.translate(-xStart, -yStart);
at.concatenate(c.getRenderingTransform());
c.setRenderingTransform(at);
thanks
hilz
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