camera.transformPxToGu(...) not working

[Mihai Andries <mihai.andries AT inria.fr>]

Hi everyone,

I am trying to color a polygon located between several nodes of a graph.
The nodes of the graph have fixed coordinates.
I have only the real-world coordinates of the polygon that must be colored.
As the graph is displayed in a different spatial reference system, I have to apply a transformation to the coordinates of the vertices of this polygon.

I am doing it by calling:
Point3 point3 =
 displayedView
.getCamera()
.transformPxToGu
(
camera.getMetrics().viewport[0] + xpoints[0],
        camera.getMetrics().viewport[1] + ypoints[0]
);

Strangely, this results in an exception (the line with .transformPxToGu(...)), even though the displayedView.getCamera() is not null:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at org.graphstream.ui.swingViewer.util.DefaultCamera.transformPxToGu(DefaultCamera.java:301)

Am I doing something wrong?
Thank you in advance.

Best regards,
Mihai

-----------------------------------------------
Mihai ANDRIES
Doctorant, Équipe MAIA
Inria Nancy - Grand Est, bâtiment C
615 rue du Jardin Botanique
54600 Villers-lès-Nancy, France
Tél. : +33 (0)3 54 95 85 96
http://mihai.andries.eu/
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