Hi,
I have associated my JMapPane to a MouseMotionListener with the
mouseDragged method. In fact, a want to extend the Pan tool to allow
the user the drag map View.
In the method mouseDragged, i catch the JmapPane and i verify the tools
used is the Pan. In this method I would like to repaint the mapArea as
the user drag the mouse in the view.
I have some problem to understand how i can do that. I have used to
method Pan (in the JmapPane class) to test and try to modify it to
repaint just a little displacment :
public void mouseDragged(MouseEvent e){
JMapPane mapPane = (JMapPane)e.getSource();
if(mapPane.getState() == JMapPane.Pan){
Rectangle bounds = mapPane.getBounds();
double x = e.getX();
double y = e.getY();
double width = mapPane.getMapArea().getWidth();
double height = mapPane.getMapArea().getHeight();
double width2 = mapPane.getMapArea().getWidth() / 2D;
double height2 = mapPane.getMapArea().getHeight() / 2D;
double mapX = (x * width) / (double)bounds.width +
mapPane.getMapArea().getMinX();
double mapY = ((bounds.getHeight() - y) * height) /
(double)bounds.height + mapPane.getMapArea().getMinY();
double zlevel = 1.0D;
Coordinate ll = new Coordinate(mapX - width2 / zlevel, mapY
- height2 / zlevel);
//System.out.println("ll : minX : "+(mapX - width2 /
zlevel)+" minY : "+(mapY - height2 / zlevel));
Coordinate ur = new Coordinate(mapX + width2 / zlevel, mapY
+ height2 / zlevel);
//System.out.println("ll : minX : "+(mapX + width2 /
zlevel)+" minY : "+(mapY + height2 / zlevel));
mapPane.setMapArea(new Envelope(ll, ur));
mapPane.repaint();
}
}
But when I do that (modifications), the result is horrible (map
discplacements are huge)!! If someone knows what must be modify to
answer my need i will help me great.
Thanks
manu
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