Update to 2.0.0 tree from current Fremantle build

[opencv] / samples / swig_python / convexhull.py

diff --git a/samples/swig_python/convexhull.py b/samples/swig_python/convexhull.py
new file mode 100755 (executable)
index 0000000..85fad65
--- /dev/null
+++ b/samples/swig_python/convexhull.py
@@ -0,0 +1,78 @@
+#! /usr/bin/env python
+
+print "OpenCV Python version of convexhull"
+
+# import the necessary things for OpenCV
+from opencv import cv
+from opencv import highgui
+
+# to generate random values
+import random
+
+# how many points we want at max
+_MAX_POINTS = 100
+
+if __name__ == '__main__':
+
+    # main object to get random values from
+    my_random = random.Random ()
+
+    # create the image where we want to display results
+    image = cv.cvCreateImage (cv.cvSize (500, 500), 8, 3)
+
+    # create the window to put the image in
+    highgui.cvNamedWindow ('hull', highgui.CV_WINDOW_AUTOSIZE)
+
+    while True:
+        # do forever
+
+        # get a random number of points
+        count = my_random.randrange (0, _MAX_POINTS) + 1
+
+        # initialisations
+        points = []
+        
+        for i in range (count):
+            # generate a random point
+            points.append (cv.cvPoint (
+                my_random.randrange (0, image.width / 2) + image.width / 4,
+                my_random.randrange (0, image.width / 2) + image.width / 4
+                ))
+
+        # compute the convex hull
+        hull = cv.cvConvexHull2 (points, cv.CV_CLOCKWISE, 0)
+
+        # start with an empty image
+        cv.cvSetZero (image)
+
+        for i in range (count):
+            # draw all the points
+            cv.cvCircle (image, points [i], 2,
+                         cv.cvScalar (0, 0, 255, 0),
+                         cv.CV_FILLED, cv.CV_AA, 0)
+
+        # start the line from the last point
+        pt0 = points [hull [-1]]
+        
+        for point_index in hull:
+            # connect the previous point to the current one
+
+            # get the current one
+            pt1 = points [point_index]
+
+            # draw
+            cv.cvLine (image, pt0, pt1,
+                       cv.cvScalar (0, 255, 0, 0),
+                       1, cv.CV_AA, 0)
+
+            # now, current one will be the previous one for the next iteration
+            pt0 = pt1
+
+        # display the final image
+        highgui.cvShowImage ('hull', image)
+
+        # handle events, and wait a key pressed
+        k = highgui.cvWaitKey (0)
+        if k == '\x1b':
+            # user has press the ESC key, so exit
+            break