delaunay2.cpp 3.81 KB
Newer Older
a  
Kai Westerkamp committed
1 2
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
wester committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
#include <iostream>

using namespace cv;
using namespace std;

static void help()
{
    cout << "\nThis program demostrates iterative construction of\n"
           "delaunay triangulation and voronoi tesselation.\n"
           "It draws a random set of points in an image and then delaunay triangulates them.\n"
           "Usage: \n"
           "./delaunay \n"
           "\nThis program builds the traingulation interactively, you may stop this process by\n"
           "hitting any key.\n";
}

static void draw_subdiv_point( Mat& img, Point2f fp, Scalar color )
{
wester committed
21
    circle( img, fp, 3, color, CV_FILLED, 8, 0 );
wester committed
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
}

static void draw_subdiv( Mat& img, Subdiv2D& subdiv, Scalar delaunay_color )
{
#if 1
    vector<Vec6f> triangleList;
    subdiv.getTriangleList(triangleList);
    vector<Point> pt(3);

    for( size_t i = 0; i < triangleList.size(); i++ )
    {
        Vec6f t = triangleList[i];
        pt[0] = Point(cvRound(t[0]), cvRound(t[1]));
        pt[1] = Point(cvRound(t[2]), cvRound(t[3]));
        pt[2] = Point(cvRound(t[4]), cvRound(t[5]));
wester committed
37 38 39
        line(img, pt[0], pt[1], delaunay_color, 1, CV_AA, 0);
        line(img, pt[1], pt[2], delaunay_color, 1, CV_AA, 0);
        line(img, pt[2], pt[0], delaunay_color, 1, CV_AA, 0);
wester committed
40 41 42 43 44 45 46 47 48
    }
#else
    vector<Vec4f> edgeList;
    subdiv.getEdgeList(edgeList);
    for( size_t i = 0; i < edgeList.size(); i++ )
    {
        Vec4f e = edgeList[i];
        Point pt0 = Point(cvRound(e[0]), cvRound(e[1]));
        Point pt1 = Point(cvRound(e[2]), cvRound(e[3]));
wester committed
49
        line(img, pt0, pt1, delaunay_color, 1, CV_AA, 0);
wester committed
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
    }
#endif
}

static void locate_point( Mat& img, Subdiv2D& subdiv, Point2f fp, Scalar active_color )
{
    int e0=0, vertex=0;

    subdiv.locate(fp, e0, vertex);

    if( e0 > 0 )
    {
        int e = e0;
        do
        {
            Point2f org, dst;
            if( subdiv.edgeOrg(e, &org) > 0 && subdiv.edgeDst(e, &dst) > 0 )
wester committed
67
                line( img, org, dst, active_color, 3, CV_AA, 0 );
wester committed
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

            e = subdiv.getEdge(e, Subdiv2D::NEXT_AROUND_LEFT);
        }
        while( e != e0 );
    }

    draw_subdiv_point( img, fp, active_color );
}


static void paint_voronoi( Mat& img, Subdiv2D& subdiv )
{
    vector<vector<Point2f> > facets;
    vector<Point2f> centers;
    subdiv.getVoronoiFacetList(vector<int>(), facets, centers);

    vector<Point> ifacet;
    vector<vector<Point> > ifacets(1);

    for( size_t i = 0; i < facets.size(); i++ )
    {
        ifacet.resize(facets[i].size());
        for( size_t j = 0; j < facets[i].size(); j++ )
            ifacet[j] = facets[i][j];

        Scalar color;
        color[0] = rand() & 255;
        color[1] = rand() & 255;
        color[2] = rand() & 255;
        fillConvexPoly(img, ifacet, color, 8, 0);

        ifacets[0] = ifacet;
wester committed
100 101
        polylines(img, ifacets, true, Scalar(), 1, CV_AA, 0);
        circle(img, centers[i], 3, Scalar(), CV_FILLED, CV_AA, 0);
wester committed
102 103 104 105
    }
}


wester committed
106
int main( int, char** )
wester committed
107
{
wester committed
108
    help();
wester committed
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148

    Scalar active_facet_color(0, 0, 255), delaunay_color(255,255,255);
    Rect rect(0, 0, 600, 600);

    Subdiv2D subdiv(rect);
    Mat img(rect.size(), CV_8UC3);

    img = Scalar::all(0);
    string win = "Delaunay Demo";
    imshow(win, img);

    for( int i = 0; i < 200; i++ )
    {
        Point2f fp( (float)(rand()%(rect.width-10)+5),
                    (float)(rand()%(rect.height-10)+5));

        locate_point( img, subdiv, fp, active_facet_color );
        imshow( win, img );

        if( waitKey( 100 ) >= 0 )
            break;

        subdiv.insert(fp);

        img = Scalar::all(0);
        draw_subdiv( img, subdiv, delaunay_color );
        imshow( win, img );

        if( waitKey( 100 ) >= 0 )
            break;
    }

    img = Scalar::all(0);
    paint_voronoi( img, subdiv );
    imshow( win, img );

    waitKey(0);

    return 0;
}