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140 lines
3.7 KiB
Python
Executable File
140 lines
3.7 KiB
Python
Executable File
#!/usr/bin/python
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"""
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the script demostrates iterative construction of
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delaunay triangulation and voronoi tesselation
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Original Author (C version): ?
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Converted to Python by: Roman Stanchak
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"""
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import cv2.cv as cv
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import random
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def draw_subdiv_point( img, fp, color ):
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cv.Circle( img, (cv.Round(fp[0]), cv.Round(fp[1])), 3, color, cv.CV_FILLED, 8, 0 );
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def draw_subdiv_edge( img, edge, color ):
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org_pt = cv.Subdiv2DEdgeOrg(edge);
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dst_pt = cv.Subdiv2DEdgeDst(edge);
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if org_pt and dst_pt :
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org = org_pt.pt;
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dst = dst_pt.pt;
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iorg = ( cv.Round( org[0] ), cv.Round( org[1] ));
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idst = ( cv.Round( dst[0] ), cv.Round( dst[1] ));
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cv.Line( img, iorg, idst, color, 1, cv.CV_AA, 0 );
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def draw_subdiv( img, subdiv, delaunay_color, voronoi_color ):
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for edge in subdiv.edges:
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edge_rot = cv.Subdiv2DRotateEdge( edge, 1 )
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draw_subdiv_edge( img, edge_rot, voronoi_color );
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draw_subdiv_edge( img, edge, delaunay_color );
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def locate_point( subdiv, fp, img, active_color ):
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(res, e0) = cv.Subdiv2DLocate( subdiv, fp );
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if res in [ cv.CV_PTLOC_INSIDE, cv.CV_PTLOC_ON_EDGE ]:
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e = e0
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while True:
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draw_subdiv_edge( img, e, active_color );
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e = cv.Subdiv2DGetEdge(e, cv.CV_NEXT_AROUND_LEFT);
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if e == e0:
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break
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draw_subdiv_point( img, fp, active_color );
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def draw_subdiv_facet( img, edge ):
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t = edge;
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count = 0;
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# count number of edges in facet
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while count == 0 or t != edge:
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count+=1
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t = cv.Subdiv2DGetEdge( t, cv.CV_NEXT_AROUND_LEFT );
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buf = []
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# gather points
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t = edge;
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for i in range(count):
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assert t>4
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pt = cv.Subdiv2DEdgeOrg( t );
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if not pt:
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break;
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buf.append( ( cv.Round(pt.pt[0]), cv.Round(pt.pt[1]) ) );
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t = cv.Subdiv2DGetEdge( t, cv.CV_NEXT_AROUND_LEFT );
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if( len(buf)==count ):
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pt = cv.Subdiv2DEdgeDst( cv.Subdiv2DRotateEdge( edge, 1 ));
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cv.FillConvexPoly( img, buf, cv.RGB(random.randrange(256),random.randrange(256),random.randrange(256)), cv.CV_AA, 0 );
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cv.PolyLine( img, [buf], 1, cv.RGB(0,0,0), 1, cv.CV_AA, 0);
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draw_subdiv_point( img, pt.pt, cv.RGB(0,0,0));
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def paint_voronoi( subdiv, img ):
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cv.CalcSubdivVoronoi2D( subdiv );
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for edge in subdiv.edges:
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# left
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draw_subdiv_facet( img, cv.Subdiv2DRotateEdge( edge, 1 ));
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# right
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draw_subdiv_facet( img, cv.Subdiv2DRotateEdge( edge, 3 ));
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if __name__ == '__main__':
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win = "source";
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rect = ( 0, 0, 600, 600 );
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active_facet_color = cv.RGB( 255, 0, 0 );
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delaunay_color = cv.RGB( 0,0,0);
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voronoi_color = cv.RGB(0, 180, 0);
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bkgnd_color = cv.RGB(255,255,255);
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img = cv.CreateImage( (rect[2],rect[3]), 8, 3 );
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cv.Set( img, bkgnd_color );
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cv.NamedWindow( win, 1 );
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storage = cv.CreateMemStorage(0);
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subdiv = cv.CreateSubdivDelaunay2D( rect, storage );
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print "Delaunay triangulation will be build now interactively."
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print "To stop the process, press any key\n";
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for i in range(200):
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fp = ( random.random()*(rect[2]-10)+5, random.random()*(rect[3]-10)+5 )
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locate_point( subdiv, fp, img, active_facet_color );
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cv.ShowImage( win, img );
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if( cv.WaitKey( 100 ) >= 0 ):
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break;
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cv.SubdivDelaunay2DInsert( subdiv, fp );
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cv.CalcSubdivVoronoi2D( subdiv );
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cv.Set( img, bkgnd_color );
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draw_subdiv( img, subdiv, delaunay_color, voronoi_color );
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cv.ShowImage( win, img );
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if( cv.WaitKey( 100 ) >= 0 ):
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break;
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cv.Set( img, bkgnd_color );
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paint_voronoi( subdiv, img );
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cv.ShowImage( win, img );
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cv.WaitKey(0);
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cv.DestroyWindow( win );
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