Added GLBarGraphItem

pyqtgraph/opengl/items/GLBarGraphItem.py

@@ -0,0 +1,29 @@
+from .GLMeshItem import GLMeshItem
+from ..MeshData import MeshData
+import numpy as np
+
+class GLBarGraphItem(GLMeshItem):
+    def __init__(self, pos, size):
+        """
+        pos is (...,3) array of the bar positions (the corner of each bar)
+        size is (...,3) array of the sizes of each bar
+        """
+        nCubes = reduce(lambda a,b: a*b, pos.shape[:-1])
+        cubeVerts = np.mgrid[0:2,0:2,0:2].reshape(3,8).transpose().reshape(1,8,3)
+        cubeFaces = np.array([
+            [0,1,2], [3,2,1],
+            [4,5,6], [7,6,5],
+            [0,1,4], [5,4,1],
+            [2,3,6], [7,6,3],
+            [0,2,4], [6,4,2],
+            [1,3,5], [7,5,3]]).reshape(1,12,3)
+        size = size.reshape((nCubes, 1, 3))
+        pos = pos.reshape((nCubes, 1, 3))
+        verts = cubeVerts * size + pos
+        faces = cubeFaces + (np.arange(nCubes) * 8).reshape(nCubes,1,1)
+        md = MeshData(verts.reshape(nCubes*8,3), faces.reshape(nCubes*12,3))
+        
+        GLMeshItem.__init__(self, meshdata=md, shader='shaded', smooth=False)
+
+        
+