Frist working copy of RAG draw

doc/examples/plot_rag_draw.py

@@ -0,0 +1,21 @@
+from skimage import graph, data, io, segmentation, color
+from matplotlib import pyplot as plt
+
+
+img = data.coffee()
+
+labels = segmentation.slic(img, compactness=30, n_segments=400)
+
+g = graph.rag_mean_color(img, labels)
+
+out = graph.rag.rag_draw(labels, g, img)
+plt.figure()
+plt.title("RAG with all edges shown in green.")
+plt.imshow(out)
+
+out = graph.rag.rag_draw(labels, g, img, high_color=(1,0,0), thresh=30)
+plt.figure()
+plt.title("RAG with edge weights less than 30, color mapped between green and red.")
+plt.imshow(out)
+
+plt.show()