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//---------------------------------【头文件、命名空间包含部分】---------------------------
//		描述：包含程序所使用的头文件和命名空间
//-------------------------------------------------------------------------------------
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
using namespace cv;
using namespace std;


//-----------------------------------【宏定义部分】----------------------------------
//  描述：定义一些辅助宏 
//-------------------------------------------------------------------------------------
#define WINDOW_NAME1 "【原始图窗口】"					//为窗口标题定义的宏 
#define WINDOW_NAME2 "【效果图窗口】"					//为窗口标题定义的宏 



//-----------------------------------【全局变量声明部分】-------------------------------
//  描述：全局变量的声明
//------------------------------------------------------------------------------------
Mat g_srcImage; Mat g_grayImage;
int g_nThresh = 50;
int g_maxThresh = 255;
RNG g_rng(12345);
Mat srcImage_copy = g_srcImage.clone();
Mat g_thresholdImage_output;
vector<vector<Point> > g_vContours;
vector<Vec4i> g_vHierarchy;


//----------------------------【全局函数声明部分】--------------------------------------
//   描述：全局函数的声明
//-------------------------------------------------------------------------------------
static void ShowHelpText( );
void on_ThreshChange(int, void* );
void ShowHelpText();

//-----------------------【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(  )
{
	system("color 3F");
	ShowHelpText();

	// 加载源图像
	g_srcImage = imread( "2007_000804.jpg", 1 );

	// 将原图转换成灰度图并进行模糊降
	cvtColor( g_srcImage, g_grayImage, COLOR_BGR2GRAY );
	blur( g_grayImage, g_grayImage, Size(3,3) );

	// 创建原图窗口并显示
	namedWindow( WINDOW_NAME1, WINDOW_AUTOSIZE );
	imshow( WINDOW_NAME1, g_srcImage );

	//创建滚动条
	createTrackbar( " 阈值:", WINDOW_NAME1, &g_nThresh, g_maxThresh, on_ThreshChange );
	on_ThreshChange( 0, 0 );//调用一次进行初始化

	waitKey(0);
	return(0);
}

//---------------------------【thresh_callback( )函数】----------------------------------
//      描述：回调函数
//-------------------------------------------------------------------------------------
void on_ThreshChange(int, void* )
{
	// 对图像进行二值化，控制阈值
	threshold( g_grayImage, g_thresholdImage_output, g_nThresh, 255, THRESH_BINARY );

	// 寻找轮廓
	findContours( g_thresholdImage_output, g_vContours, g_vHierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE, Point(0, 0) );

	// 遍历每个轮廓，寻找其凸包
	vector<vector<Point> >hull( g_vContours.size() );
	for( unsigned int i = 0; i < g_vContours.size(); i++ )
	{  
		convexHull( Mat(g_vContours[i]), hull[i], false );
	}

	// 绘出轮廓及其凸包
	Mat drawing = Mat::zeros( g_thresholdImage_output.size(), CV_8UC3 );
	Mat drawing1;
	cv::cvtColor(g_grayImage, drawing1, cv::COLOR_GRAY2BGR);
	Mat drawing2 = Mat::zeros(g_thresholdImage_output.size(), CV_8UC3);

	for(unsigned  int i = 0; i< g_vContours.size(); i++ )
	{
		Scalar color = Scalar( g_rng.uniform(0, 255), g_rng.uniform(0,255), g_rng.uniform(0,255) );
		drawContours( drawing, g_vContours, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
		drawContours( drawing, hull, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
		drawContours( drawing1, hull, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
		drawContours(drawing2, g_vContours, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
	}

	// 显示效果图
	imshow( WINDOW_NAME2, drawing );
	imshow( "hull", drawing1);
	imshow( "Contours", drawing2);
}


//-----------------------------------【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72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");
}