[Jung-support] [Open Discussion] Zoom / Layout problem

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The following forum message was posted by philit at http://sourceforge.net/projects/jung/forums/forum/252062/topic/5051386:

Hello,

i work on a graph editor. I use the VisualizationViewer to show the graph and
a DefaultModalGraphMouse.

When i add a vertex at layout position (0,0), why is the location on the
VisualizationViewer not at (0,0)? The position of the vertex at the
VisualizationViewer is   rather (30,30).

With the TRANSFORMING mode of the DefaultModalGraphMouse, the origin of the
layout is transformed. But why returns the function layout.transform(Vertex(0,0))
always the same coordinates?

My problem is, that i want to draw a grid, for a better user placement of the
vertices. But after zooming and transforming i must adapt that grid to the zoom
factor and the transformation. Therefore i need the screen coordinates of the
layout origin.