opencv3检测凸包convexHull函数-使用方法一-滚动条

#include<iostream>
#include<opencv2/opencv.hpp>
#include<vector>

using namespace cv;
using namespace std;

int g_nColorThick = 0;
int g_nLineThick = 0;

int g_nBackBlue = 0;
int g_nBackGreen = 0;
int g_nBackRed = 0;

int g_bPointWay = 0;
int g_bLineWay = 0;

int g_nPointBlue = 0;
int g_nPointGreen = 0;
int g_nPointRed = 0;

int g_nLineBlue = 0;
int g_nLineGreen = 0;
int g_nLineRed = 0;

int g_nShowWay = 0;

int main()
{
	//先初始化变量
	Mat srcImage(Size(600, 600), CV_8UC3, Scalar(0));
	Mat saveImage;
	srcImage.copyTo(saveImage);
	RNG &rng = theRNG();

	namedWindow("【滚动条窗口】", 0);
	createTrackbar("circlethick", "【滚动条窗口】", &g_nColorThick, 100, 0);
	createTrackbar("linethick", "【滚动条窗口】", &g_nLineThick, 100, 0);
	createTrackbar("backblue", "【滚动条窗口】", &g_nBackBlue, 255, 0);
	createTrackbar("backgreen", "【滚动条窗口】", &g_nBackGreen, 255, 0);
	createTrackbar("backred", "【滚动条窗口】", &g_nBackRed, 255, 0);
	createTrackbar("pointblue", "【滚动条窗口】", &g_nPointBlue, 255, 0);
	createTrackbar("pointgreen", "【滚动条窗口】", &g_nPointGreen, 255, 0);
	createTrackbar("pointred", "【滚动条窗口】", &g_nPointRed, 255, 0);

	createTrackbar("lineblue", "【滚动条窗口】", &g_nLineBlue, 255, 0);
	createTrackbar("linegreen", "【滚动条窗口】", &g_nLineGreen, 255, 0);
	createTrackbar("linered", "【滚动条窗口】", &g_nLineRed, 255, 0);

	createTrackbar("pointway", "【滚动条窗口】", &g_bPointWay, 1, 0);
	createTrackbar("lineway", "【滚动条窗口】", &g_bLineWay, 1, 0);

	createTrackbar("showway", "【滚动条窗口】", &g_nShowWay, 1000, 0);

	char key;
	Point midPoint;
	//hull 变量用来存储点的序号
	vector<int> hull;
	while (1)
	{
		//因为下面是入栈操作，所以，需要在循环内为变量分配空间，否则，栈内的数据无法出栈
		vector<Point> points;
		//首先确定随机点的坐标，以及随机点落定的范围
		int count = (unsigned int)rng % 100 + 3;
		for (int i = 0; i < count; i++)
		{
			//确定随机点的范围
			midPoint.x = rng.uniform(srcImage.cols / 4, srcImage.cols * 3 / 4);
			midPoint.y = rng.uniform(srcImage.rows / 4, srcImage.rows * 3 / 4);
			points.push_back(midPoint);
		}

		//绘制随机点
		double pointColorBlue, pointColorGreen, pointColorRed;
		for (int i = 0; i < (int)points.size(); i++)
		{
			if (g_bPointWay == 0)
			{
				pointColorBlue = rng.uniform(0, 255);
				pointColorGreen = rng.uniform(0, 255);
				pointColorRed = rng.uniform(0, 255);
			}
			else
			{
				pointColorBlue = g_nPointBlue;
				pointColorGreen = g_nPointGreen;
				pointColorRed = g_nPointRed;
			}
			circle(srcImage, points[i], 0, Scalar(pointColorBlue, pointColorGreen, pointColorRed)
				, g_nColorThick + 1, 8);
		}

		//该用法结束后，hull将外围点的序号存放起来
		convexHull(Mat(points), hull, true);

		//绘制凸包
		Point point0 = points[hull[hull.size() - 1]];
		double lineColorBlue, lineColorGreen, lineColorRed;
		for (int i = 0; i < (int)hull.size(); i++)
		{
			Point curPoint = points[hull[i]];

			if (g_bLineWay == 0)
			{
				lineColorBlue = rng.uniform(0, 255);
				lineColorGreen = rng.uniform(0, 255);
				lineColorRed = rng.uniform(0, 255);
			}
			else
			{
				lineColorBlue = g_nLineBlue;
				lineColorGreen = g_nLineGreen;
				lineColorRed = g_nLineRed;
			}

			line(srcImage, point0, curPoint, Scalar(lineColorBlue, lineColorGreen, lineColorRed)
				, g_nLineThick, 8);

			point0 = curPoint;
		}

		imshow("【显示窗口】", srcImage);

		//停止在没有按键事件发生时
		if (g_nShowWay == 0)
			key = waitKey();
		else
			key = waitKey(g_nShowWay);
		if (key == 27)
			break;
		else
			srcImage = Scalar(g_nBackBlue, g_nBackGreen, g_nBackRed);
		/*saveImage.copyTo(srcImage);*/
	}

	return 0;
}

来源：CSDN

作者：轩落_翼

链接：https://blog.csdn.net/qq_23880193/article/details/49257133