75 lines
1.7 KiB
Mathematica
75 lines
1.7 KiB
Mathematica
#! /usr/bin/env octave
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printf("OpenCV Octave version of convexhull\n");
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## import the necessary things for OpenCV
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cv;
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highgui;
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## how many points we want at max
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_MAX_POINTS = 100;
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## create the image where we want to display results
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image = cv.cvCreateImage (cv.cvSize (500, 500), 8, 3);
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## create the window to put the image in
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highgui.cvNamedWindow ('hull', highgui.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 = int32(rand()*_MAX_POINTS)+1
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## initialisations
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points = {};
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for i=1:count,
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## generate a random point
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points{i} = cv.cvPoint \
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(int32(rand() * (image.width / 2) + image.width / 4), \
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int32(rand() * (image.height / 2) + image.height / 4)); \
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endfor
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## compute the convex hull
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hull = cv.cvConvexHull2 (points, cv.CV_CLOCKWISE, 0);
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## start with an empty image
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cv.cvSetZero (image);
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for i=1:count,
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## draw all the points
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cv.cvCircle (image, points {i}, 2, \
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cv.cvScalar (0, 0, 255, 0), \
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cv.CV_FILLED, cv.CV_AA, 0);
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endfor
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## start the line from the last point
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pt0 = points {hull [-1]};
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for point_index = 1:hull.rows,
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## connect the previous point to the current one
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## get the current one
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pt1 = points {point_index};
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## draw
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cv.cvLine (image, pt0, pt1, \
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cv.cvScalar (0, 255, 0, 0), \
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1, cv.CV_AA, 0);
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## now, current one will be the previous one for the next iteration
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pt0 = pt1;
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endfor
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## display the final image
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highgui.cvShowImage ('hull', image);
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## handle events, and wait a key pressed
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k = highgui.cvWaitKey (0);
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if (k == '\x1b')
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## user has press the ESC key, so exit
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break
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endif
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endwhile
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