a18_UseMouse.cpp

#include <ros/ros.h>
#include <opencv2/opencv.hpp>
using namespace cv;

//-----------------------------------【宏定义部分】--------------------------------------------
//  描述：定义一些辅助宏 
//------------------------------------------------------------------------------------------------ 
#define WINDOW_NAME "【程序窗口】"        //为窗口标题定义的宏 


//-----------------------------------【全局函数声明部分】------------------------------------
//		描述：全局函数的声明
//------------------------------------------------------------------------------------------------
void on_MouseHandle(int event, int x, int y, int flags, void* param);//鼠标回调函数
void DrawRectangle( cv::Mat& img, cv::Rect box );//自定义的矩形绘制函数
void ShowHelpText( );

//-----------------------------------【全局变量声明部分】-----------------------------------
//		描述：全局变量的声明
//-----------------------------------------------------------------------------------------------
Rect g_rectangle;
bool g_bDrawingBox = false;//是否进行绘制
RNG g_rng(12345);



//-----------------------------------【main( )函数】--------------------------------------------
//		描述：控制台应用程序的入口函数，我们的程序从这里开始执行
//-------------------------------------------------------------------------------------------------
int main( int argc, char** argv ) 
{
	ros::init(argc, argv, "a18_UseMouse");
    //【0】改变console字体颜色
	system("color 9F"); 

	//【0】显示欢迎和帮助文字
	ShowHelpText();

	//【1】准备参数
	g_rectangle = Rect(-1,-1,0,0);
	Mat srcImage(600, 800,CV_8UC3), tempImage;
	srcImage.copyTo(tempImage);
	g_rectangle = Rect(-1,-1,0,0);
	srcImage = Scalar::all(0);

	//【2】设置鼠标操作回调函数
	namedWindow( WINDOW_NAME );
	setMouseCallback(WINDOW_NAME,on_MouseHandle,(void*)&srcImage);

	//【3】程序主循环，当进行绘制的标识符为真时，进行绘制
	while(1)
	{
		srcImage.copyTo(tempImage);//拷贝源图到临时变量
		if( g_bDrawingBox ) DrawRectangle( tempImage, g_rectangle );//当进行绘制的标识符为真，则进行绘制
		imshow( WINDOW_NAME, tempImage );
		if( waitKey( 10 ) == 27 ) break;//按下ESC键，程序退出
	}
	return 0;
}



//--------------------------------【on_MouseHandle( )函数】-----------------------------
//		描述：鼠标回调函数，根据不同的鼠标事件进行不同的操作
//-----------------------------------------------------------------------------------------------
void on_MouseHandle(int event, int x, int y, int flags, void* param)
{

	ROS_INFO("on_MouseHandle()");
	//std::cout << "on_MouseHandle()" << event << std::endl;			
	Mat& image = *(cv::Mat*) param;
	switch( event)
	{
		//鼠标移动消息
	case EVENT_MOUSEMOVE: 
		{
			if( g_bDrawingBox )//如果是否进行绘制的标识符为真，则记录下长和宽到RECT型变量中
			{
				g_rectangle.width = x-g_rectangle.x;
				g_rectangle.height = y-g_rectangle.y;
			}
		}
		break;

		//左键按下消息
	case EVENT_LBUTTONDOWN: 
		{
			std::cout << "EVENT_LBUTTONDOWN" << std::endl;			
			g_bDrawingBox = true;
			g_rectangle =Rect( x, y, 0, 0 );//记录起始点
		}
		break;

		//左键抬起消息
	case EVENT_LBUTTONUP: 
		{
			std::cout << "EVENT_LBUTTONUP" << std::endl;			
			g_bDrawingBox = false;//置标识符为false
			//对宽和高小于0的处理
			if( g_rectangle.width < 0 )
			{
				g_rectangle.x += g_rectangle.width;
				g_rectangle.width *= -1;
			}

			if( g_rectangle.height < 0 ) 
			{
				g_rectangle.y += g_rectangle.height;
				g_rectangle.height *= -1;
			}
			//调用函数进行绘制
			DrawRectangle( image, g_rectangle );
		}
		break;

	}
}



//-----------------------------------【DrawRectangle( )函数】------------------------------
//		描述：自定义的矩形绘制函数
//-----------------------------------------------------------------------------------------------
void DrawRectangle( cv::Mat& img, cv::Rect box )
{
	std::cout << "draw base point " << box.tl() << " and " << box.br() << std::endl;
	cv::rectangle(img,box.tl(),box.br(),cv::Scalar(g_rng.uniform(0, 255), g_rng.uniform(0,255), g_rng.uniform(0,255)));//随机颜色
}


//-----------------------------------【ShowHelpText( )函数】-----------------------------
//          描述：输出一些帮助信息
//----------------------------------------------------------------------------------------------
void ShowHelpText()
{
	//输出欢迎信息和OpenCV版本
	printf("\n\n\t\t\t非常感谢购买《OpenCV3编程入门》一书！\n");
	printf("\n\n\t\t\t此为本书OpenCV3版的第18个配套示例程序\n");
	printf("\n\n\t\t\t   当前使用的OpenCV版本为：" CV_VERSION );
	printf("\n\n  ----------------------------------------------------------------------------\n");
	//输出一些帮助信息
	printf("\n\n\n\t欢迎来到【鼠标交互演示】示例程序\n"); 
	printf("\n\n\t请在窗口中点击鼠标左键并拖动以绘制矩形\n");

}