/** * @file Drawing_1.cpp * @brief Simple geometric drawing * @author OpenCV team */ #include #include #include #define w 400 using namespace cv; /// Function headers void MyEllipse( Mat img, double angle ); void MyFilledCircle( Mat img, Point center ); void MyPolygon( Mat img ); void MyLine( Mat img, Point start, Point end ); /** * @function main * @brief Main function */ int main( void ){ //![create_images] /// Windows names char atom_window[] = "Drawing 1: Atom"; char rook_window[] = "Drawing 2: Rook"; /// Create black empty images Mat atom_image = Mat::zeros( w, w, CV_8UC3 ); Mat rook_image = Mat::zeros( w, w, CV_8UC3 ); //![create_images] /// 1. Draw a simple atom: /// ----------------------- //![draw_atom] /// 1.a. Creating ellipses MyEllipse( atom_image, 90 ); MyEllipse( atom_image, 0 ); MyEllipse( atom_image, 45 ); MyEllipse( atom_image, -45 ); /// 1.b. Creating circles MyFilledCircle( atom_image, Point( w/2, w/2) ); //![draw_atom] /// 2. Draw a rook /// ------------------ //![draw_rook] /// 2.a. Create a convex polygon MyPolygon( rook_image ); //![rectangle] /// 2.b. Creating rectangles rectangle( rook_image, Point( 0, 7*w/8 ), Point( w, w), Scalar( 0, 255, 255 ), FILLED, LINE_8 ); //![rectangle] /// 2.c. Create a few lines MyLine( rook_image, Point( 0, 15*w/16 ), Point( w, 15*w/16 ) ); MyLine( rook_image, Point( w/4, 7*w/8 ), Point( w/4, w ) ); MyLine( rook_image, Point( w/2, 7*w/8 ), Point( w/2, w ) ); MyLine( rook_image, Point( 3*w/4, 7*w/8 ), Point( 3*w/4, w ) ); //![draw_rook] /// 3. Display your stuff! imshow( atom_window, atom_image ); moveWindow( atom_window, 0, 200 ); imshow( rook_window, rook_image ); moveWindow( rook_window, w, 200 ); waitKey( 0 ); return(0); } /// Function Declaration /** * @function MyEllipse * @brief Draw a fixed-size ellipse with different angles */ //![my_ellipse] void MyEllipse( Mat img, double angle ) { int thickness = 2; int lineType = 8; ellipse( img, Point( w/2, w/2 ), Size( w/4, w/16 ), angle, 0, 360, Scalar( 255, 0, 0 ), thickness, lineType ); } //![my_ellipse] /** * @function MyFilledCircle * @brief Draw a fixed-size filled circle */ //![my_filled_circle] void MyFilledCircle( Mat img, Point center ) { circle( img, center, w/32, Scalar( 0, 0, 255 ), FILLED, LINE_8 ); } //![my_filled_circle] /** * @function MyPolygon * @brief Draw a simple concave polygon (rook) */ //![my_polygon] void MyPolygon( Mat img ) { int lineType = LINE_8; /** Create some points */ Point rook_points[1][20]; rook_points[0][0] = Point( w/4, 7*w/8 ); rook_points[0][1] = Point( 3*w/4, 7*w/8 ); rook_points[0][2] = Point( 3*w/4, 13*w/16 ); rook_points[0][3] = Point( 11*w/16, 13*w/16 ); rook_points[0][4] = Point( 19*w/32, 3*w/8 ); rook_points[0][5] = Point( 3*w/4, 3*w/8 ); rook_points[0][6] = Point( 3*w/4, w/8 ); rook_points[0][7] = Point( 26*w/40, w/8 ); rook_points[0][8] = Point( 26*w/40, w/4 ); rook_points[0][9] = Point( 22*w/40, w/4 ); rook_points[0][10] = Point( 22*w/40, w/8 ); rook_points[0][11] = Point( 18*w/40, w/8 ); rook_points[0][12] = Point( 18*w/40, w/4 ); rook_points[0][13] = Point( 14*w/40, w/4 ); rook_points[0][14] = Point( 14*w/40, w/8 ); rook_points[0][15] = Point( w/4, w/8 ); rook_points[0][16] = Point( w/4, 3*w/8 ); rook_points[0][17] = Point( 13*w/32, 3*w/8 ); rook_points[0][18] = Point( 5*w/16, 13*w/16 ); rook_points[0][19] = Point( w/4, 13*w/16 ); const Point* ppt[1] = { rook_points[0] }; int npt[] = { 20 }; fillPoly( img, ppt, npt, 1, Scalar( 255, 255, 255 ), lineType ); } //![my_polygon] /** * @function MyLine * @brief Draw a simple line */ //![my_line] void MyLine( Mat img, Point start, Point end ) { int thickness = 2; int lineType = LINE_8; line( img, start, end, Scalar( 0, 0, 0 ), thickness, lineType ); } //![my_line]