I have made a simple application that draws a map in a jframe. The problem is that the map becomes blank when the frame is resized or minimized.
The code: public void interFace(Geometry[] kartData) throws Exception
{
// feature attributes creation
AttributeType[] types = new AttributeType[1];
types[0] =
AttributeTypeFactory.newAttributeType("centre", MultiLineString.class);
// feature type creation
FeatureType pointType =
FeatureTypeFactory.newFeatureType(types, "linefeature");
FeatureCollection aFeatureCollection =
FeatureCollections.newCollection();
for(int i = 0; i < kartData.length; i++)
{
aFeatureCollection.add(pointType.create(new
Object[]{(MultiLineString)kartData[i]}));
}
// Prepare styles
StyleBuilder sb = new StyleBuilder();
// Create line symbolizer
LineSymbolizer lineSymb =
(LineSymbolizer)
sb.createLineSymbolizer(Color.RED, 1);
Style aStyle = sb.createStyle(lineSymb);
MapContext map = new DefaultMapContext();
map.addLayer(aFeatureCollection, aStyle);
renderer = new StreamingRenderer();
renderer.setContext(map);
double scaleX =
p.getBounds().getWidth()
/
aFeatureCollection.getBounds().getWidth();
double scaleY =
p.getBounds().getHeight()
/
aFeatureCollection.getBounds().getHeight();
double scale = scaleX < scaleY ? scaleX :
scaleY;
transform = new AffineTransform();
transform.translate(0,
p.getBounds().getHeight());
transform.scale(scale, -scale);
transform.translate(
-aFeatureCollection.getBounds().getMinX(),
-aFeatureCollection.getBounds().getMinY());
//
p.getGraphics().clearRect(0,0,(int)p.getBounds().getWidth(),(int)p.getBounds().getHeight());
//p.setBackground(Color.black);
System.out.println(p.getGraphics());
System.out.println(p.getBounds());
System.out.println(transform);
renderer.paint((Graphics2D) p.getGraphics(),
p.getBounds(),
transform);
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent
e) {
e.getWindow().dispose();
}
public void windowActivated(
WindowEvent e )
{
p.repaint();
}
public void windowClosed( WindowEvent e
)
{
p.repaint();
}
public void windowDeactivated(
WindowEvent e )
{
p.repaint();
}
public void windowOpened( WindowEvent e
)
{
p.repaint();
}
public void windowIconfield(
WindowEvent e )
{
p.repaint();
}
public void windowIconified(
WindowEvent e )
{
p.repaint();
}
public void windowDeiconified(
WindowEvent e ) {
p.repaint();
}
public void windowStateChanged(
WindowEvent e ) {
p.repaint();
}
});
What am i doing wrong??
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