OpenCV 基本图形绘制函数详解
作者:double32 时间:2022-01-22 11:09:59
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 <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);
运行:
参考:
《OpenCV3 编程入门》 毛星云 P104
来源:https://www.cnblogs.com/huvjie/p/15674797.html
标签:OpenCV,基本,图形函数
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