C++|C++ OpenCV绘制几何图形 C++OpenCV绘制几何图形

本文实例为大家分享了C++ OpenCV绘制几何图形的具体代码，供大家参考，具体内容如下
绘制几何图形

直线
矩形
多边形
圆形
椭圆
文字

API
直线

CV_EXPORTS_W void line(InputOutputArray img, Point pt1, Point pt2, const Scalar& color,int thickness = 1, int lineType = LINE_8, int shift = 0);

矩形

CV_EXPORTS_W void rectangle(InputOutputArray img, Point pt1, Point pt2,const Scalar& color, int thickness = 1,int lineType = LINE_8, int shift = 0);

上方函数通过两点确定矩形的位置和大小，下方函数则是通过矩形对象 Rect 来确定。

CV_EXPORTS_W void rectangle(InputOutputArray img, Rect rec,const Scalar& color, int thickness = 1,int lineType = LINE_8, int shift = 0);

多边形

CV_EXPORTS void polylines(InputOutputArray img, const Point* const* pts, const int* npts,int ncontours, bool isClosed, const Scalar& color,int thickness = 1, int lineType = LINE_8, int shift = 0 );

CV_EXPORTS_W void polylines(InputOutputArray img, InputArrayOfArrays pts,bool isClosed, const Scalar& color,int thickness = 1, int lineType = LINE_8, int shift = 0 );

圆形

CV_EXPORTS_W void circle(InputOutputArray img, Point center, int radius,const Scalar& color, int thickness = 1,int lineType = LINE_8, int shift = 0);

椭圆

CV_EXPORTS_W void ellipse(InputOutputArray img, const RotatedRect& box, const Scalar& color,int thickness = 1, int lineType = LINE_8);

CV_EXPORTS_W void ellipse(InputOutputArray img, Point center, Size axes,double angle, double startAngle, double endAngle,const Scalar& color, int thickness = 1,int lineType = LINE_8, int shift = 0);

文字

CV_EXPORTS_W void putText( InputOutputArray img, const String& text, Point org,int fontFace, double fontScale, Scalar color,int thickness = 1, int lineType = LINE_8,bool bottomLeftOrigin = false );

示例
官方示例一

#include #include #include #define w 400using namespace cv; void MyEllipse( Mat img, double angle ); void MyFilledCircle( Mat img, Point center ); void MyPolygon( Mat img ); void MyLine( Mat img, Point start, Point end ); int main( void ){char atom_window[] = "Drawing 1: Atom"; char rook_window[] = "Drawing 2: Rook"; Mat atom_image = Mat::zeros( w, w, CV_8UC3 ); Mat rook_image = Mat::zeros( w, w, CV_8UC3 ); MyEllipse( atom_image, 90 ); MyEllipse( atom_image, 0 ); MyEllipse( atom_image, 45 ); MyEllipse( atom_image, -45 ); MyFilledCircle( atom_image, Point( w/2, w/2) ); MyPolygon( rook_image ); rectangle( rook_image,Point( 0, 7*w/8 ),Point( w, w),Scalar( 0, 255, 255 ),FILLED,LINE_8 ); 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 ) ); imshow( atom_window, atom_image ); moveWindow( atom_window, 0, 200 ); imshow( rook_window, rook_image ); moveWindow( rook_window, w, 200 ); waitKey( 0 ); return(0); }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 ); }void MyFilledCircle( Mat img, Point center ){circle( img,center,w/32,Scalar( 0, 0, 255 ),FILLED,LINE_8 ); }void MyPolygon( Mat img ){int lineType = LINE_8; 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 ); }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 ); }

文章图片

官方示例二

#include #include #include #include #include using namespace cv; const int NUMBER = 100; const int DELAY = 5; const int window_width = 900; const int window_height = 600; int x_1 = -window_width/2; int x_2 = window_width*3/2; int y_1 = -window_width/2; int y_2 = window_width*3/2; static Scalar randomColor( RNG& rng ); int Drawing_Random_Lines( Mat image, char* window_name, RNG rng ); int Drawing_Random_Rectangles( Mat image, char* window_name, RNG rng ); int Drawing_Random_Ellipses( Mat image, char* window_name, RNG rng ); int Drawing_Random_Polylines( Mat image, char* window_name, RNG rng ); int Drawing_Random_Filled_Polygons( Mat image, char* window_name, RNG rng ); int Drawing_Random_Circles( Mat image, char* window_name, RNG rng ); int Displaying_Random_Text( Mat image, char* window_name, RNG rng ); int Displaying_Big_End( Mat image, char* window_name, RNG rng ); int main( void ){int c; char window_name[] = "Drawing_2 Tutorial"; RNG rng( 0xFFFFFFFF ); Mat image = Mat::zeros( window_height, window_width, CV_8UC3 ); imshow( window_name, image ); waitKey( DELAY ); c = Drawing_Random_Lines(image, window_name, rng); if( c != 0 ) return 0; c = Drawing_Random_Rectangles(image, window_name, rng); if( c != 0 ) return 0; c = Drawing_Random_Ellipses( image, window_name, rng ); if( c != 0 ) return 0; c = Drawing_Random_Polylines( image, window_name, rng ); if( c != 0 ) return 0; c = Drawing_Random_Filled_Polygons( image, window_name, rng ); if( c != 0 ) return 0; c = Drawing_Random_Circles( image, window_name, rng ); if( c != 0 ) return 0; c = Displaying_Random_Text( image, window_name, rng ); if( c != 0 ) return 0; c = Displaying_Big_End( image, window_name, rng ); if( c != 0 ) return 0; waitKey(0); return 0; }static Scalar randomColor( RNG& rng ){int icolor = (unsigned) rng; return Scalar( icolor&255, (icolor>>8)&255, (icolor>>16)&255 ); }int Drawing_Random_Lines( Mat image, char* window_name, RNG rng ){Point pt1, pt2; for( int i = 0; i < NUMBER; i++ ){pt1.x = rng.uniform( x_1, x_2 ); pt1.y = rng.uniform( y_1, y_2 ); pt2.x = rng.uniform( x_1, x_2 ); pt2.y = rng.uniform( y_1, y_2 ); line( image, pt1, pt2, randomColor(rng), rng.uniform(1, 10), 8 ); imshow( window_name, image ); if( waitKey( DELAY ) >= 0 ){ return -1; }}return 0; }int Drawing_Random_Rectangles( Mat image, char* window_name, RNG rng ){Point pt1, pt2; int lineType = 8; int thickness = rng.uniform( -3, 10 ); for( int i = 0; i < NUMBER; i++ ){pt1.x = rng.uniform( x_1, x_2 ); pt1.y = rng.uniform( y_1, y_2 ); pt2.x = rng.uniform( x_1, x_2 ); pt2.y = rng.uniform( y_1, y_2 ); rectangle( image, pt1, pt2, randomColor(rng), MAX( thickness, -1 ), lineType ); imshow( window_name, image ); if( waitKey( DELAY ) >= 0 ){ return -1; }}return 0; }int Drawing_Random_Ellipses( Mat image, char* window_name, RNG rng ){int lineType = 8; for ( int i = 0; i < NUMBER; i++ ){Point center; center.x = rng.uniform(x_1, x_2); center.y = rng.uniform(y_1, y_2); Size axes; axes.width = rng.uniform(0, 200); axes.height = rng.uniform(0, 200); double angle = rng.uniform(0, 180); ellipse( image, center, axes, angle, angle - 100, angle + 200,randomColor(rng), rng.uniform(-1,9), lineType ); imshow( window_name, image ); if( waitKey(DELAY) >= 0 ){ return -1; }}return 0; }int Drawing_Random_Polylines( Mat image, char* window_name, RNG rng ){int lineType = 8; for( int i = 0; i< NUMBER; i++ ){Point pt[2][3]; pt[0][0].x = rng.uniform(x_1, x_2); pt[0][0].y = rng.uniform(y_1, y_2); pt[0][1].x = rng.uniform(x_1, x_2); pt[0][1].y = rng.uniform(y_1, y_2); pt[0][2].x = rng.uniform(x_1, x_2); pt[0][2].y = rng.uniform(y_1, y_2); pt[1][0].x = rng.uniform(x_1, x_2); pt[1][0].y = rng.uniform(y_1, y_2); pt[1][1].x = rng.uniform(x_1, x_2); pt[1][1].y = rng.uniform(y_1, y_2); pt[1][2].x = rng.uniform(x_1, x_2); pt[1][2].y = rng.uniform(y_1, y_2); const Point* ppt[2] = {pt[0], pt[1]}; int npt[] = {3, 3}; polylines(image, ppt, npt, 2, true, randomColor(rng), rng.uniform(1,10), lineType); imshow( window_name, image ); if( waitKey(DELAY) >= 0 ){ return -1; }}return 0; }int Drawing_Random_Filled_Polygons( Mat image, char* window_name, RNG rng ){int lineType = 8; for ( int i = 0; i < NUMBER; i++ ){Point pt[2][3]; pt[0][0].x = rng.uniform(x_1, x_2); pt[0][0].y = rng.uniform(y_1, y_2); pt[0][1].x = rng.uniform(x_1, x_2); pt[0][1].y = rng.uniform(y_1, y_2); pt[0][2].x = rng.uniform(x_1, x_2); pt[0][2].y = rng.uniform(y_1, y_2); pt[1][0].x = rng.uniform(x_1, x_2); pt[1][0].y = rng.uniform(y_1, y_2); pt[1][1].x = rng.uniform(x_1, x_2); pt[1][1].y = rng.uniform(y_1, y_2); pt[1][2].x = rng.uniform(x_1, x_2); pt[1][2].y = rng.uniform(y_1, y_2); const Point* ppt[2] = {pt[0], pt[1]}; int npt[] = {3, 3}; fillPoly( image, ppt, npt, 2, randomColor(rng), lineType ); imshow( window_name, image ); if( waitKey(DELAY) >= 0 ){ return -1; }}return 0; }int Drawing_Random_Circles( Mat image, char* window_name, RNG rng ){int lineType = 8; for (int i = 0; i < NUMBER; i++){Point center; center.x = rng.uniform(x_1, x_2); center.y = rng.uniform(y_1, y_2); circle( image, center, rng.uniform(0, 300), randomColor(rng),rng.uniform(-1, 9), lineType ); imshow( window_name, image ); if( waitKey(DELAY) >= 0 ){ return -1; }}return 0; }int Displaying_Random_Text( Mat image, char* window_name, RNG rng ){int lineType = 8; for ( int i = 1; i < NUMBER; i++ ){Point org; org.x = rng.uniform(x_1, x_2); org.y = rng.uniform(y_1, y_2); putText( image, "Testing text rendering", org, rng.uniform(0,8),rng.uniform(0,100)*0.05+0.1, randomColor(rng), rng.uniform(1, 10), lineType); imshow( window_name, image ); if( waitKey(DELAY) >= 0 ){ return -1; }}return 0; }int Displaying_Big_End( Mat image, char* window_name, RNG ){Size textsize = getTextSize("OpenCV forever!", FONT_HERSHEY_COMPLEX, 3, 5, 0); Point org((window_width - textsize.width)/2, (window_height - textsize.height)/2); int lineType = 8; Mat image2; for( int i = 0; i < 255; i += 2 ){image2 = image - Scalar::all(i); putText( image2, "OpenCV forever!", org, FONT_HERSHEY_COMPLEX, 3,Scalar(i, i, 255), 5, lineType ); imshow( window_name, image2 ); if( waitKey(DELAY) >= 0 ){ return -1; }}return 0; }

【C++|C++ OpenCV绘制几何图形】以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。