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151 lines
3.9 KiB
C++
151 lines
3.9 KiB
C++
#include <opencv2/imgproc/imgproc.hpp>
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#include <opencv2/highgui/highgui.hpp>
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#include <iostream>
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using namespace cv;
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using namespace std;
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static void help()
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{
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cout << "\nThis program demostrates iterative construction of\n"
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"delaunay triangulation and voronoi tesselation.\n"
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"It draws a random set of points in an image and then delaunay triangulates them.\n"
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"Usage: \n"
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"./delaunay \n"
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"\nThis program builds the traingulation interactively, you may stop this process by\n"
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"hitting any key.\n";
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}
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static void draw_subdiv_point( Mat& img, Point2f fp, Scalar color )
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{
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circle( img, fp, 3, color, CV_FILLED, 8, 0 );
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}
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static void draw_subdiv( Mat& img, Subdiv2D& subdiv, Scalar delaunay_color )
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{
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#if 1
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vector<Vec6f> triangleList;
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subdiv.getTriangleList(triangleList);
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vector<Point> pt(3);
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for( size_t i = 0; i < triangleList.size(); i++ )
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{
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Vec6f t = triangleList[i];
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pt[0] = Point(cvRound(t[0]), cvRound(t[1]));
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pt[1] = Point(cvRound(t[2]), cvRound(t[3]));
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pt[2] = Point(cvRound(t[4]), cvRound(t[5]));
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line(img, pt[0], pt[1], delaunay_color, 1, CV_AA, 0);
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line(img, pt[1], pt[2], delaunay_color, 1, CV_AA, 0);
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line(img, pt[2], pt[0], delaunay_color, 1, CV_AA, 0);
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}
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#else
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vector<Vec4f> edgeList;
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subdiv.getEdgeList(edgeList);
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for( size_t i = 0; i < edgeList.size(); i++ )
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{
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Vec4f e = edgeList[i];
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Point pt0 = Point(cvRound(e[0]), cvRound(e[1]));
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Point pt1 = Point(cvRound(e[2]), cvRound(e[3]));
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line(img, pt0, pt1, delaunay_color, 1, CV_AA, 0);
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}
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#endif
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}
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static void locate_point( Mat& img, Subdiv2D& subdiv, Point2f fp, Scalar active_color )
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{
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int e0=0, vertex=0;
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CvSubdiv2DEdge e00;
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subdiv.locate(fp, e0, vertex);
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if( e0 > 0 )
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{
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int e = e0;
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do
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{
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Point2f org, dst;
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if( subdiv.edgeOrg(e, &org) > 0 && subdiv.edgeDst(e, &dst) > 0 )
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line( img, org, dst, active_color, 3, CV_AA, 0 );
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e = subdiv.getEdge(e, Subdiv2D::NEXT_AROUND_LEFT);
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}
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while( e != e0 );
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}
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draw_subdiv_point( img, fp, active_color );
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}
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void paint_voronoi( Mat& img, Subdiv2D& subdiv )
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{
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vector<vector<Point2f> > facets;
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vector<Point2f> centers;
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subdiv.getVoronoiFacetList(vector<int>(), facets, centers);
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vector<Point> ifacet;
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vector<vector<Point> > ifacets(1);
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for( size_t i = 0; i < facets.size(); i++ )
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{
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ifacet.resize(facets[i].size());
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for( size_t j = 0; j < facets[i].size(); j++ )
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ifacet[j] = facets[i][j];
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Scalar color;
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color[0] = rand() & 255;
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color[1] = rand() & 255;
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color[2] = rand() & 255;
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fillConvexPoly(img, ifacet, color, 8, 0);
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ifacets[0] = ifacet;
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polylines(img, ifacets, true, Scalar(), 1, CV_AA, 0);
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circle(img, centers[i], 3, Scalar(), -1, CV_AA, 0);
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}
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}
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int main( int, char** )
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{
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help();
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Scalar active_facet_color(0, 0, 255), delaunay_color(255,255,255);
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Rect rect(0, 0, 600, 600);
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Subdiv2D subdiv(rect);
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Mat img(rect.size(), CV_8UC3);
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img = Scalar::all(0);
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string win = "Delaunay Demo";
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imshow(win, img);
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for( int i = 0; i < 200; i++ )
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{
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Point2f fp( (float)(rand()%(rect.width-10)+5),
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(float)(rand()%(rect.height-10)+5));
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locate_point( img, subdiv, fp, active_facet_color );
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imshow( win, img );
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if( waitKey( 100 ) >= 0 )
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break;
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subdiv.insert(fp);
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img = Scalar::all(0);
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draw_subdiv( img, subdiv, delaunay_color );
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imshow( win, img );
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if( waitKey( 100 ) >= 0 )
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break;
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}
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img = Scalar::all(0);
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paint_voronoi( img, subdiv );
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imshow( win, img );
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waitKey(0);
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return 0;
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}
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