Opencv C++ 繪製多邊形/矩形/直線

Opencv C++ 繪製多邊形/矩形/直線

#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <iostream>

using namespace std;
using namespace cv;

//繪製直線;
void DrawLine(Mat img, Point startPoint, Point endPoint)
{
	line(img, startPoint, endPoint, Scalar(0, 0, 0), 2, 8);
}

//繪製多邊形;
void DrawPolygon(Mat inputImage, vector<Point> polygonPoint, bool bIsFill, bool bIsClosed = true)
{
	vector<vector<Point>> contours;
	contours.push_back(polygonPoint);

	if (bIsFill)
		fillPoly(inputImage, contours, Scalar(255, 255, 255), 8);
	else
		polylines(inputImage, polygonPoint, bIsClosed, Scalar(255, 255, 255), 2, 8);
}

int main()
{
	//1.創建顯示圖片
	Mat imgDraw = Mat::zeros(600, 600, CV_8UC3);

	//2.繪製多邊形 -- 封閉不填充
	vector<Point> vPolygonPoint;
	vPolygonPoint.push_back(Point(150, 50));
	vPolygonPoint.push_back(Point(250, 200));
	vPolygonPoint.push_back(Point(150, 350));
	vPolygonPoint.push_back(Point(50, 200));
	DrawPolygon(imgDraw, vPolygonPoint, false);

	//3.繪製多邊形 -- 不封閉不填充
	vPolygonPoint.clear();
	vPolygonPoint.push_back(Point(160, 50));
	vPolygonPoint.push_back(Point(260, 200));
	vPolygonPoint.push_back(Point(160, 350));
	DrawPolygon(imgDraw, vPolygonPoint, false, false);
	
	//4.繪製多邊形 -- 內填充
	vPolygonPoint.clear();
	vPolygonPoint.push_back(Point(350, 100));
	vPolygonPoint.push_back(Point(550, 100));
	vPolygonPoint.push_back(Point(450, 200));
	vPolygonPoint.push_back(Point(300, 200));
	DrawPolygon(imgDraw, vPolygonPoint, true);
	
	//5.繪製矩形
	int nHeight = imgDraw.cols;
	int nWidth = imgDraw.rows;
	rectangle(imgDraw, Point(0, 6 * nHeight / 8), Point(nWidth, nHeight), Scalar(255, 255, 255), -1);
	rectangle(imgDraw, Point(10, 10), Point(nWidth - 10, 6 * nHeight / 8 - 10), Scalar(255, 255, 255), 2);

	//6.繪製直線
	DrawLine(imgDraw, Point(0, 7 * nHeight / 8), Point(nWidth, 7 * nHeight / 8));
	DrawLine(imgDraw, Point(0, 6 * nHeight / 8), Point(nWidth, nHeight));
	DrawLine(imgDraw, Point(0, nHeight), Point(nWidth, 6 * nHeight / 8));
	DrawLine(imgDraw, Point(nWidth/2, 6* nHeight /8), Point(nWidth/2, nHeight));

	//7.顯示圖片
	imshow("imgDraw", imgDraw);
	waitKey(0);
	destroyAllWindows();

	return 0;
}

填充多邊形

void cv::fillPoly	(	
InputOutputArray 	img,  	//輸入圖片 繪製的圖片
InputArrayOfArrays 	pts,	//多邊形的點集  
const Scalar & 	color,		//填充的顏色
int 	lineType = LINE_8,	//線類型 8連通繪製
int 	shift = 0,			//計算位數精度
Point 	offset = Point()    //座標偏移
)	

繪製多邊形

void cv::polylines	(	
InputOutputArray 	img,  	//輸入/繪製圖片
InputArrayOfArrays 	pts,	//多邊形點集
bool 	isClosed,			//是否自動封閉
const Scalar & 	color,		//線條顏色
int 	thickness = 1,		//線寬
int 	lineType = LINE_8,	//繪製線條領域
int 	shift = 0 			//計算位數精度
)	

繪製矩形

void cv::rectangle	(	
InputOutputArray 	img,//輸入/繪製圖片
Point 	pt1,			//矩形點1
Point 	pt2,			//矩形點2
const Scalar & 	color,	//線條顏色
int thickness = 1,		//線條寬度
int lineType = LINE_8,	//繪製線條領域
int shift = 0			//計算位數精度
)