VS2017&OPENCV4.0
#include <opencv2/opencv.hpp>
#include <iostream>
using namespace std;
using namespace cv;
Mat bgImage;
const char* drawdemo_win = "draw shapes and text demo";
void MyLines();
void MyRectangle();
void MyEllipse();
void MyCircle();
void MyPolygon();
void RandomLineDemo();
int main(int argc, char** argv) {
bgImage = imread("D:\\test.jpg");
if (!bgImage.data) {
printf("could not load image...\n");
return -1;
}
MyLines();
MyRectangle();
MyEllipse();
MyCircle();
MyPolygon();
putText(bgImage, "Hello OpenCV", Point(300, 300), FONT_HERSHEY_COMPLEX, 1.0, Scalar(12, 23, 200), 3, 8);
namedWindow(drawdemo_win, WINDOW_AUTOSIZE);
imshow(drawdemo_win, bgImage);
RandomLineDemo();
waitKey(0);
return 0;
}
void MyLines() {//绘制线
Point p1 = Point(20, 30);//线的起点
Point p2;
p2.x = 400;
p2.y = 400;//线的终点
Scalar color = Scalar(0, 0, 255);//线的颜色
line(bgImage, p1, p2, color, 1, LINE_AA);
}
void MyRectangle() {//绘制矩形
Rect rect = Rect(200, 100, 300, 300);//矩形的起点和线长
Scalar color = Scalar(255, 0, 0);
rectangle(bgImage, rect, color, 2, LINE_8);
}
void MyEllipse() {//绘制椭圆
Scalar color = Scalar(0, 255, 0);
ellipse(bgImage, Point(bgImage.cols / 2, bgImage.rows / 2), Size(bgImage.cols / 4, bgImage.rows / 8), 90, 0, 360, color, 2, LINE_8);
}
void MyCircle() {//绘制圆
Scalar color = Scalar(0, 255, 255);
Point center = Point(bgImage.cols / 2, bgImage.rows / 2);//圆的中心
circle(bgImage, center, 150, color, 2, 8);
}
void MyPolygon() {//绘制多边形
Point pts[1][5];//五边形
pts[0][0] = Point(100, 100);
pts[0][1] = Point(100, 200);
pts[0][2] = Point(200, 200);
pts[0][3] = Point(200, 100);
pts[0][4] = Point(100, 100);
const Point* ppts[] = { pts[0] };
int npt[] = { 5 };
Scalar color = Scalar(255, 12, 255);
fillPoly(bgImage, ppts, npt, 1, color, 8);
}
void RandomLineDemo() {
RNG rng(12345);//定义随机数
Point pt1;
Point pt2;
Mat bg = Mat::zeros(bgImage.size(), bgImage.type());
namedWindow("random line demo", WINDOW_AUTOSIZE);
for (int i = 0; i < 100000; i++) {
pt1.x = rng.uniform(0, bgImage.cols);//随机数产生,0到bgImage.cols
pt2.x = rng.uniform(0, bgImage.cols);
pt1.y = rng.uniform(0, bgImage.rows);//随机数产生,0到 bgImage.rows
pt2.y = rng.uniform(0, bgImage.rows);
Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));//0到255产生随机数
if (waitKey(50) > 0) {
break;
}
line(bg, pt1, pt2, color, 1, 8);
imshow("random line demo", bg);
}
}