Michael, I have some problem about my function. when I try to getScaleX() i
have an error java.lang.NullPointerException
I try to make zoom in function right after i set my style.
am I wrong about that? or is there any other way to getScaleX??
I change the function where I found in ZoomInTool.java so I don't need to
click the mouse to zoom in
public void finalizestyle(){
Rule otherRule = createRule(LINE_COLOUR, FILL_COLOUR,false);
otherRule.setElseFilter(true);
fixfts.rules().add(otherRule);
stylefinal.featureTypeStyles().add(fixfts);
mapFrame.getMapContext().getLayer(0).setStyle(stylefinal);
mapFrame.getMapPane().repaint();
Rectangle paneArea = mapFrame.getMapPane().getVisibleRect();
double scale =
mapFrame.getMapPane().getWorldToScreenTransform().getScaleX();
double newScale = scale * 5;
DirectPosition2D corner = new DirectPosition2D(
posisix[0] - 0.5d * paneArea.getWidth() / newScale,
posisiy[0] + 0.5d * paneArea.getHeight() / newScale);
DirectPosition2D mapPos = null;
mapPos.x=posisix[0];
mapPos.y=posisiy[0];
Envelope2D newMapArea = new Envelope2D();
newMapArea.setFrameFromCenter(mapPos, corner);
mapFrame.getMapPane().setDisplayArea(newMapArea);
}
Darmawan
mbedward wrote:
>
> Hi Darmawan,
>
> Really all that happens with the zoom in and zoom out cursor tools is
> that they work out the new map bounds (as a ReferencedEnvelope) and
> then call JMapPane.setDisplayArea.
>
> Perhaps the easiest thing for you to do is look at the source code for
> ZoomInTool, ZoomOutTool, and their base class AbstractZoomTool. You
> can find them all here...
>
> http://svn.osgeo.org/geotools/tags/2.6.0/modules/unsupported/swing/src/main/java/org/geotools/swing/tool/
>
> When using ZoomInTool you can draw a box on the map pane with the
> mouse to define the area to zoom in to. The code that draws the box is
> part of the JMapPane class so you don't need to implement that
> yourself.
>
> Michael
>
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