Clean up center on graph

Author: mbastian

modules/opengl-commons/src/main/java/org/gephi/viz/engine/util/actions/InputActionsProcessor.java

@@ -123,10 +123,6 @@ public void processZoomEvent(double zoomQuantity, int x, int y) {
     }
 
     public void processCenterOnGraphEvent() {
-        final GraphIndex index = engine.getLookup().lookup(GraphIndex.class);
-        final Rect2D visibleGraphBoundaries = index.getGraphBoundaries();
-
-        final float[] center = visibleGraphBoundaries.center();
-        engine.centerOn(new Vector2f(center[0], center[1]), visibleGraphBoundaries.width(), visibleGraphBoundaries.height());
+        engine.centerOnGraph();
     }
 }