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#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
static void help(char** argv)
{
cout << "\nThis program demonstrates iterative construction of\n"
"delaunay triangulation and voronoi tessellation.\n"
"It draws a random set of points in an image and then delaunay triangulates them.\n"
"Usage: \n";
cout << argv[0];
cout << "\n\nThis program builds the triangulation interactively, you may stop this process by\n"
"hitting any key.\n";
}
static void draw_subdiv_point( Mat& img, Point2f fp, Scalar color )
{
circle( img, fp, 3, color, FILLED, LINE_8, 0 );
}
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]));
line(img, pt[0], pt[1], delaunay_color, 1, LINE_AA, 0);
line(img, pt[1], pt[2], delaunay_color, 1, LINE_AA, 0);
line(img, pt[2], pt[0], delaunay_color, 1, LINE_AA, 0);
}
#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]));
line(img, pt0, pt1, delaunay_color, 1, LINE_AA, 0);
}
#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 )
line( img, org, dst, active_color, 3, LINE_AA, 0 );
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;
polylines(img, ifacets, true, Scalar(), 1, LINE_AA, 0);
circle(img, centers[i], 3, Scalar(), FILLED, LINE_AA, 0);
}
}
int main( int argc, char** argv )
{
cv::CommandLineParser parser(argc, argv, "{help h||}");
if (parser.has("help"))
{
help(argv);
return 0;
}
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;
}
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