C++,OpenCV鼠标操作(8)

鼠标事件响应

void setMouseCallback(const String& winname, MouseCallback onm ouse, void* userdata = 0);
/*******************************************************************
*			winname： 			监听窗口名称
*			onMouse：			鼠标事件回调函数
*			userdata：			递给回调函数的可选参数
*********************************************************************/

鼠标事件回调函数

typedef void (*MouseCallback)(int event, int x, int y, int flags, void* userdata);
//MouseCallback onm ouse
void onm ouse(int event,int x,int y,int flag,void *param)
/*******************************************************************
*			event： 			事件类型
*			x：				鼠标所在图像的坐标
*			y：				
*		    flags:			代表拖拽事件
*			param:			自己定义的onMouse事件的ID
*********************************************************************/    

鼠标事件类型

enum MouseEventTypes {
       EVENT_MOUSEMOVE      = 0, 	//鼠标移动
       EVENT_LBUTTONDOWN    = 1, 	//鼠标左键按下
       EVENT_RBUTTONDOWN    = 2,	//鼠标右键按下 
       EVENT_MBUTTONDOWN    = 3, 	//鼠标中键按下
       EVENT_LBUTTONUP      = 4, 	//鼠标左键弹起
       EVENT_RBUTTONUP      = 5, 	//鼠标右键弹起
       EVENT_MBUTTONUP      = 6, 	//鼠标中键弹起
       EVENT_LBUTTONDBLCLK  = 7, 	//鼠标左键双击
       EVENT_RBUTTONDBLCLK  = 8, 	//鼠标右键双击
       EVENT_MBUTTONDBLCLK  = 9, 	//鼠标中间双击
       EVENT_MOUSEWHEEL     = 10,	//鼠标滚轮 正数和负数分别表示向前和向后滚动
       EVENT_MOUSEHWHEEL    = 11 	//鼠标滚轮 正数和负数分别表示向右和向左滚动  
     };

鼠标拖拽类型

enum MouseEventFlags {
       EVENT_FLAG_LBUTTON   = 1,    //左键拖动
       EVENT_FLAG_RBUTTON   = 2, 	//右键拖动
       EVENT_FLAG_MBUTTON   = 4, 	//中键拖动
       EVENT_FLAG_CTRLKEY   = 8, 	//ctr拖动
       EVENT_FLAG_SHIFTKEY  = 16,	//shift拖动
       EVENT_FLAG_ALTKEY    = 32 	//alt拖动
     };

综合代码

//Opencv鼠标左键画圆，右键画方
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
class DrawShape 
{
public:
	DrawShape() :mat(imread("mm.jpg")) {}
	void Show(string wName = "drawShape") 
	{
		imshow(wName, mat);
	}
	void DrawCircle(int x = 300, int y = 300, int r = 10) 
	{
		circle(mat, Point(x, y), r, Scalar(0, 255, 0));
	}
	void DrawRecagnle(int x = 200, int y = 200, int w = 40, int h = 40) 
	{
		rectangle(mat, Rect(x, y, w, h), Scalar(255, 0, 0));
	}
	static void onm ouse(int event, int x, int y, int flag, void* param);
protected:
	Mat mat;
};
void DrawShape::OnMouse(int event, int x, int y, int flag, void* param)
{
	DrawShape* pshape = (DrawShape*)param;
	switch(event)
	{
	case EVENT_LBUTTONDOWN:
		cout << "左键按下......." << endl;
		pshape->DrawCircle(x,y,10);
		break;
	case EVENT_RBUTTONDOWN:
		cout << "右键按下......." << endl;
		pshape->DrawRecagnle(x-5,y-5,10,10);
		break;
	}
}
int main() 
{
	DrawShape* pshape = new DrawShape;
	namedWindow("drawShape");
	setMouseCallback("drawShape", &DrawShape::OnMouse, pshape);
	//主循环
	while (1) 
	{
		pshape->Show();
		if (waitKey(10) == 27) 
		{
			break;
		}
	}
	delete pshape;
	pshape = nullptr;
	return 0;
}