Add really basic GLGraphItem example

examples/GLGraphItem.py

@@ -0,0 +1,47 @@
+"""
+Demonstrates use of GLGraphItem
+
+"""
+
+## Add path to library (just for examples; you do not need this)
+import initExample
+
+import pyqtgraph as pg
+import pyqtgraph.opengl as gl
+import numpy as np
+
+app = pg.mkQApp("GLGraphItem Example")
+w = gl.GLViewWidget()
+w.setCameraPosition(distance=20)
+w.show()
+
+edges = np.array([
+    [0, 2],
+    [0, 3],
+    [1, 2],
+    [1, 3],
+    [2, 3]
+])
+
+nodes = np.array(
+    [
+        [0, 0, 0],
+        [1, 0, 0],
+        [0, 1, 0],
+        [1, 1, 1]
+    ]
+)
+
+edgeColor=pg.glColor("w")
+
+gi = gl.GLGraphItem(
+    edges=edges,
+    nodePositions=nodes,
+    edgeWidth=1.,
+    nodeSize=10.
+)
+
+w.addItem(gi)
+
+if __name__ == "__main__":
+    pg.exec()