OpenCV 基本圖形繪制函數詳解
- 用於繪制直線的line函數;
- 用於繪制橢圓的ellipse函數;
- 用於繪制矩形的rectangle函數;
- 用於繪制圓的circle函數;
- 用於繪制填充的多邊形的fillPoly函數。
#include <opencv2/core/core.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <opencv2/highgui/highgui.hpp> using namespace cv; using namespace std; #define WINDOW_WIDTH 600 // 定義窗口大小的宏 #define WINDOW_NAME1 "原子圖" //為窗口標題定義的宏 #define WINDOW_NAME2 "多邊形圖以及畫線" //為窗口標題定義的宏 /***繪制橢圓***/ void DrawEllipse(Mat img, double angle) { int thickness = 2; // 線寬 int lineType = 8; // 線性,8 代表聯通線性 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); } /*繪制實心圓*/ void DrawFilledCircle(Mat img, Point center) int thickness = -1; // 線粗-1,代表實心 circle(img, center, WINDOW_WIDTH / 32, Scalar(0, 0, 255), /*凹多邊形繪制*/ void DrawPolygon(Mat img) int lineType = 8; // 創建一些點 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] }; // 多邊形定點集 int npt[] = { 20 }; // 多邊形定點數目 fillPoly(img, ppt, npt, 1, Scalar(255, 255, 255), // 多邊形顏色:白色 /*線繪制*/ 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); // 橢圓繪制 DrawEllipse(atomImage, 0); DrawEllipse(atomImage, 90); DrawEllipse(atomImage, 45); DrawEllipse(atomImage, -45); // 繪制圓心 DrawFilledCircle(atomImage, Point(WINDOW_WIDTH / 2, WINDOW_WIDTH / 2)); // 繪制多邊形 DrawPolygon(rookImage); // 繪制矩形 rectangle(rookImage, Point(0, 7 * WINDOW_WIDTH / 8), Point(WINDOW_WIDTH, WINDOW_WIDTH), Scalar(0, 255, 255), -1, 8); // 繪制一些線段 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>顯示繪制出的圖像------------------------ imshow(WINDOW_NAME1, atomImage); moveWindow(WINDOW_NAME1, 0, 200); imshow(WINDOW_NAME2, rookImage); moveWindow(WINDOW_NAME2, WINDOW_WIDTH, 200); waitKey(0); return(0);
運行:
參考:
《OpenCV3 編程入門》 毛星雲 P104
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