少有人走的路绘制形状比较简单，基本上没啥子好说的，见代码。
演示代码：
#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("e:/2.png");
if (!bgImage.data) {
printf("could not load image...\n");
return -1;
}
MyLines();
MyRectangle();
MyEllipse();
MyCircle();
MyPolygon();
putText(bgImage, "Hello OpenCV", Point(300, 300), CV_FONT_HERSHEY_COMPLEX, 1.0, Scalar(12, 23, 200), 3, 8);
namedWindow(drawdemo_win, CV_WINDOW_AUTOSIZE);
imshow(drawdemo_win, bgImage);
//RandomLineDemo();
waitKey(0);
return 0;
}
void MyLines() {
Point p1 = Point(20, 30);
Point p2;
p2.x = 400;
p2.y = 400;
Scalar color = Scalar(0, 0, 255);
line(bgImage, p1, p2, color, 1, LINE_AA);
}
void MyRectangle() {
Rect rect = Rect(200, 100, 300, 300);
Scalar color = Scalar(255, 0, 0);
rectangle(bgImage, rect, color, 2, LINE_8);
}
void MyEllipse() {
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() {
Scalar color = Scalar(0, 255, 255);
Point center = Point(bgImage.cols / 2, bgImage.rows / 2);
circle(bgImage, center, 150, color, 2, 8);
}
void MyPolygon() {
Point pts[1][5];
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);
Point pt1;
Point pt2;
Mat bg = Mat::zeros(bgImage.size(), bgImage.type());
namedWindow("random line demo", CV_WINDOW_AUTOSIZE);
for (int i = 0; i < 100000; i++) {
pt1.x = rng.uniform(0, bgImage.cols);
pt2.x = rng.uniform(0, bgImage.cols);
pt1.y = rng.uniform(0, bgImage.rows);
pt2.y = rng.uniform(0, bgImage.rows);
Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
if (waitKey(50) > 0) {
break;
}
line(bg, pt1, pt2, color, 1, 8);
imshow("random line demo", bg);
}
}
（画几何形状和文字）
（随机画线）
代码说明：
Point表示2D平面上一个点x,y Point p; p.x = 10; p.y = 8; or p = Pont(10,8); Scalar表示四个元素的向量 Scalar(a, b, c);// a = blue, b = green, c = red表示RGB三个通道
画线 cv::line （LINE_4\LINE_8\LINE_AA） 画椭圆cv::ellipse 画矩形cv::rectangle 画圆cv::circle 画填充cv::fillPoly
填充矩形
可以通过多边形填充来填充矩形
随机数生成cv::RNG
生成高斯随机数gaussian (double sigma) 生成正态分布随机数uniform (int a, int b)
绘制添加文字
putText函数 中设置fontFace(cv::HersheyFonts), - fontFace, CV_FONT_HERSHEY_PLAIN - fontScale , 1.0, 2.0~ 8.0
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作者：hackpig
来源：www.skcircle.com
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