65 lines
1.7 KiB
Python
Executable File
65 lines
1.7 KiB
Python
Executable File
#! /usr/bin/env python
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print "OpenCV Python version of convexhull"
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# import the necessary things for OpenCV
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import cv
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# to generate random values
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import random
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# how many points we want at max
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_MAX_POINTS = 100
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if __name__ == '__main__':
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# main object to get random values from
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my_random = random.Random ()
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# create the image where we want to display results
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image = cv.CreateImage ( (500, 500), 8, 3)
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# create the window to put the image in
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cv.NamedWindow ('hull', cv.CV_WINDOW_AUTOSIZE)
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while True:
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# do forever
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# get a random number of points
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count = my_random.randrange (0, _MAX_POINTS) + 1
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# initialisations
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points = []
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for i in range (count):
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# generate a random point
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points.append ( (
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my_random.randrange (0, image.width / 2) + image.width / 4,
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my_random.randrange (0, image.width / 2) + image.width / 4
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))
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# compute the convex hull
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storage = cv.CreateMemStorage(0)
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hull = cv.ConvexHull2 (points, storage, cv.CV_CLOCKWISE, 1)
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# start with an empty image
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cv.SetZero (image)
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# draw all the points as circles in red
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for i in range (count):
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cv.Circle (image, points [i], 2,
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(0, 0, 255, 0),
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cv.CV_FILLED, cv.CV_AA, 0)
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# Draw the convex hull as a closed polyline in green
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cv.PolyLine(image, [hull], 1, cv.RGB(0,255,0), 1, cv.CV_AA)
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# display the final image
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cv.ShowImage ('hull', image)
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# handle events, and wait a key pressed
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k = cv.WaitKey (0) % 0x100
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if k == 27:
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# user has press the ESC key, so exit
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break
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