In perspective mode, the color legend is malproportioned and the legend axis is displayed at an angle, crossing through the gradient. Tested with QwtPlot3D 0.2.7 and Qt 4.3.3.
Probably the easiest way to reproduce this is to patch the simpleplot demo:
--- /usr/share/doc/qwtplot3d-0.2.7/examples/simpleplot/simpleplot.cpp 2008-02-27 13:51:37.000000000 +0100
+++ simpleplot.cpp 2008-03-05 13:39:07.000000000 +0100
@@ -66,6 +66,9 @@
setCoordinateStyle(BOX);
+ setOrtho(false);
+ showColorLegend(true);
+
updateData();
updateGL();
}
Screenshot of patched simplot demo