OpenCV|OpenCV 基本图形绘制函数详解 OpenCV基本图形绘制函数详解

用于绘制直线的line函数；
用于绘制椭圆的ellipse函数；
用于绘制矩形的rectangle函数；
用于绘制圆的circle函数；
用于绘制填充的多边形的fillPoly函数。

#include #include #include using namespace cv; using namespace std; #define WINDOW_WIDTH 600 // 定义窗口大小的宏#define WINDOW_NAME1 "原子图"//为窗口标题定义的宏 #define WINDOW_NAME2 "多边形图以及画线"//为窗口标题定义的宏 /***绘制椭圆***/void DrawEllipse(Mat img, double angle){int thickness = 2; //线宽int lineType = 8; // 线性，8 代表联通线性ellipse(img,Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2),Size(WINDOW_WIDTH / 4, WINDOW_WIDTH / 16),angle, // 角度，0~360 度0,360,Scalar(255, 129, 0),thickness,lineType); }/*绘制实心圆*/void DrawFilledCircle(Mat img, Point center)int thickness = -1; //线粗-1，代表实心circle(img,center,WINDOW_WIDTH / 32,Scalar(0, 0, 255),/*凹多边形绘制*/void DrawPolygon(Mat img)int lineType = 8; // 创建一些点Point rookPoints[1][20]; rookPoints[0][0] = Point(WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8); rookPoints[0][1] = Point(3 * WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8); rookPoints[0][2] = Point(3 * WINDOW_WIDTH / 4, 13 * WINDOW_WIDTH / 16); rookPoints[0][3] = Point(11 * WINDOW_WIDTH / 16, 13 * WINDOW_WIDTH / 16); rookPoints[0][4] = Point(19 * WINDOW_WIDTH / 32, 3 * WINDOW_WIDTH / 8); rookPoints[0][5] = Point(3 * WINDOW_WIDTH / 4, 3 * WINDOW_WIDTH / 8); rookPoints[0][6] = Point(3 * WINDOW_WIDTH / 4, WINDOW_WIDTH / 8); rookPoints[0][7] = Point(26 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8); rookPoints[0][8] = Point(26 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4); rookPoints[0][9] = Point(22 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4); rookPoints[0][10] = Point(22 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8); rookPoints[0][11] = Point(18 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8); rookPoints[0][12] = Point(18 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4); rookPoints[0][13] = Point(14 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 4); rookPoints[0][14] = Point(14 * WINDOW_WIDTH / 40, WINDOW_WIDTH / 8); rookPoints[0][15] = Point(WINDOW_WIDTH / 4, WINDOW_WIDTH / 8); rookPoints[0][16] = Point(WINDOW_WIDTH / 4, 3 * WINDOW_WIDTH / 8); rookPoints[0][17] = Point(13 * WINDOW_WIDTH / 32, 3 * WINDOW_WIDTH / 8); rookPoints[0][18] = Point(5 * WINDOW_WIDTH / 16, 13 * WINDOW_WIDTH / 16); rookPoints[0][19] = Point(WINDOW_WIDTH / 4, 13 * WINDOW_WIDTH / 16); const Point* ppt[1] = { rookPoints[0] }; // 多边形定点集int npt[] = { 20 }; // 多边形定点数目fillPoly(img, ppt, npt, 1, Scalar(255, 255, 255),// 多边形颜色：白色/*线绘制*/void DrawLine(Mat img, Point start, Point end)int thickness = 2; line(img,start,end,Scalar(0,0,0), // 黑色int main(int argc, char ** argv)Mat atomImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3); Mat rookImage = Mat::zeros(WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3); // 椭圆绘制DrawEllipse(atomImage, 0); DrawEllipse(atomImage, 90); DrawEllipse(atomImage, 45); DrawEllipse(atomImage, -45); // 绘制圆心DrawFilledCircle(atomImage, Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2)); // 绘制多边形DrawPolygon(rookImage); // 绘制矩形rectangle(rookImage,Point(0, 7 * WINDOW_WIDTH / 8),Point(WINDOW_WIDTH, WINDOW_WIDTH),Scalar(0, 255, 255),-1,8); // 绘制一些线段DrawLine(rookImage, Point(0, 15 * WINDOW_WIDTH / 16), Point(WINDOW_WIDTH, 15 * WINDOW_WIDTH / 16)); DrawLine(rookImage, Point(WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8), Point(WINDOW_WIDTH / 4, WINDOW_WIDTH)); DrawLine(rookImage, Point(WINDOW_WIDTH / 2, 7 * WINDOW_WIDTH / 8), Point(WINDOW_WIDTH / 2, WINDOW_WIDTH)); DrawLine(rookImage, Point(3 * WINDOW_WIDTH / 4, 7 * WINDOW_WIDTH / 8), Point(3 * WINDOW_WIDTH / 4, WINDOW_WIDTH)); // ---------------------------<3>显示绘制出的图像------------------------imshow(WINDOW_NAME1, atomImage); moveWindow(WINDOW_NAME1, 0, 200); imshow(WINDOW_NAME2, rookImage); moveWindow(WINDOW_NAME2, WINDOW_WIDTH, 200); waitKey(0); return(0);

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