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This article mainly explains "what are the basic graphics drawing functions of OpenCV". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn what are the basic graphics drawing functions of OpenCV.

Line function for drawing straight Lin

Ellipse function for drawing Ellipse

Rectangle function for drawing rectangles

Circle function for drawing circles

The fillPoly function used to draw filled polygons.

# include # include # include using namespace cv;using namespace std;#define WINDOW_WIDTH 600 / / Macro # define WINDOW_NAME1 "Atomic Diagram" / / Macro # define WINDOW_NAME2 "Polygon Diagram and Line drawing" / / Macro / * * draw Ellipse * / void DrawEllipse (Mat img, double angle) {int thickness = 2; / / Line width int lineType = 8 / / Linear, 8 represents Unicom Linear ellipse (img, Point (WINDOW_WIDTH / 2, WINDOW_WIDTH / 2), Size (WINDOW_WIDTH / 4, WINDOW_WIDTH / 16), angle, / / Angle, 0,360 degrees 0,360, Scalar (255,129,0), thickness, lineType) } / * draw a solid circle * / void DrawFilledCircle (Mat img, Point center) {int thickness =-1; / / Line thick-1, representing solid int lineType = 8; / / Linear, 8 represents connected linear circle (img, center, WINDOW_WIDTH / 32, Scalar (0,0,255), thickness, lineType) } / * concave polygon rendering * / void DrawPolygon (Mat img) {int lineType = 8; / / create some points 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]}; / / Polygon fixed-point set int npt [] = {20} / / number of fixed points of polygons fillPoly (img, ppt, npt, 1, Scalar (255,255,255), / / Polygon color: White lineType);} / * Line drawing * / void DrawLine (Mat img, Point start, Point end) {int thickness = 2; int lineType = 8 Line (img, start, end, Scalar), / / Black thickness, lineType);} 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); / / Ellipse drawing DrawEllipse (atomImage, 0) DrawEllipse (atomImage, 90); DrawEllipse (atomImage, 45); DrawEllipse (atomImage,-45); / draw the center of the circle DrawFilledCircle (atomImage, Point (WINDOW_WIDTH / 2, WINDOW_WIDTH / 2)); / / draw polygons DrawPolygon (rookImage) / draw rectangular rectangle (rookImage, Point (0,7 * WINDOW_WIDTH / 8), Point (WINDOW_WIDTH, WINDOW_WIDTH), Scalar (0,255,255),-1,8); / / draw some line segments 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)) / /-display the drawn image-imshow (WINDOW_NAME1, atomImage); moveWindow (WINDOW_NAME1, 0200); imshow (WINDOW_NAME2, rookImage); moveWindow (WINDOW_NAME2, WINDOW_WIDTH, 200); waitKey (0); return (0);}

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