Opencv用鼠标绘制填充多边形

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

#define WINDOW_NAME "鼠标事件窗口"
#define EVENT_WINDOW "滚动条窗口"

using namespace std;
using namespace cv;

//滚动条
int g_CurNum;
const int g_NumMax = 500, g_nMaxAlphaValue = 255, g_switch = 1;

Rect g_rectangle;
bool g_bDrawingBox = false;
RNG g_rng(12345);

Point g_CurPoint;
Point g_rookPoints[1][g_NumMax];
int g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r, g_nAlphaValueSlider_switch;
Scalar g_PolyCurColor;

int g_PointNum = 10;
int switch_flag = 0;

void DrawPolygon(Mat &img, const Point **pts, const int *npts, int ncontours, Scalar color);
void onMouse(int event, int x, int y, int flag, void *param);
void on_Trackbar(int, void *);
void on_Trackbar_b(int, void *);
void on_Trackbar_g(int, void *);
void on_Trackbar_r(int, void *);
void on_Trackbar_switch(int, void *);

int main()
{
Mat srcImage(600, 800, CV_8UC3);
Mat tempImage;

srcImage.copyTo(tempImage);

srcImage = Scalar::all(0);

/*namedWindow(WINDOW_NAME);
setMouseCallback(WINDOW_NAME, onMouse, (void *)&srcImage);*/

g_CurNum = 10;
g_nAlphaValueSlider_b = 255;
g_nAlphaValueSlider_g = 0;
g_nAlphaValueSlider_r = 0;
namedWindow("滚动条窗口");
createTrackbar("点数", EVENT_WINDOW, &g_CurNum, g_NumMax, on_Trackbar);
on_Trackbar(g_CurNum, 0);
createTrackbar("blue", EVENT_WINDOW, &g_nAlphaValueSlider_b, g_nMaxAlphaValue, on_Trackbar_b);
on_Trackbar_b(g_nAlphaValueSlider_b, 0);
createTrackbar("green", EVENT_WINDOW, &g_nAlphaValueSlider_g, g_nMaxAlphaValue, on_Trackbar_g);
on_Trackbar_g(g_nAlphaValueSlider_g, 0);
createTrackbar("red", EVENT_WINDOW, &g_nAlphaValueSlider_r, g_nMaxAlphaValue, on_Trackbar_r);
on_Trackbar_r(g_nAlphaValueSlider_r, 0);
createTrackbar("switch", EVENT_WINDOW, &g_nAlphaValueSlider_switch, g_switch, on_Trackbar_switch);
on_Trackbar_switch(g_nAlphaValueSlider_switch, 0);

while (1)
{
if (switch_flag)
{
namedWindow(WINDOW_NAME);
setMouseCallback(WINDOW_NAME, onMouse, (void *)&srcImage);
while (1)
{
srcImage.copyTo(tempImage);

if (g_bDrawingBox)
{
const Point *ppt[1] = { g_rookPoints[0] };
int npt[] = { g_CurNum };
DrawPolygon(tempImage, ppt, npt, 1, g_PolyCurColor);
}

imshow(WINDOW_NAME, tempImage);

if (!switch_flag)
break;

if (waitKey(10) == 27)
break;
}
}

if (waitKey(10) == 27)
break;
}

return 0;
}

void DrawPolygon(Mat &img, const Point **pts, const int *npts, int ncontours, Scalar color)
{
fillPoly(img, pts, npts, ncontours, color);
}

void onMouse(int event, int x, int y, int flag, void *param)
{
Mat &img = *(cv::Mat*)param;
static int _flag = 0;

switch (event)
{
//	//移动鼠标的时候
//case CV_EVENT_MOUSEMOVE:
//{
//						   if (g_bDrawingBox)
//						   {
//							   g_rectangle.width = x - g_rectangle.x;
//							   g_rectangle.height = y - g_rectangle.y;
//						   }
//}
//	break;
//点击鼠标左键时
case CV_EVENT_LBUTTONDOWN:
{
g_bDrawingBox = true;
g_CurPoint = Point(x, y);
}
break;
//松开鼠标左键时
case CV_EVENT_LBUTTONUP:
{
g_bDrawingBox = false;
g_rookPoints[0][_flag++] = g_CurPoint;

if (_flag == g_CurNum)
{
_flag = 0;

const Point *ppt[1] = { g_rookPoints[0] };
int npt[] = { g_CurNum };
DrawPolygon(img, ppt, npt, 1, g_PolyCurColor);
}
}
break;
}
}

void on_Trackbar(int, void *)
{
g_PointNum = g_CurNum;
}
void on_Trackbar_b(int, void *)
{
g_PolyCurColor = Scalar(g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r);
}
void on_Trackbar_g(int, void *)
{
g_PolyCurColor = Scalar(g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r);
}
void on_Trackbar_r(int, void *)
{
g_PolyCurColor = Scalar(g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r);
}
void on_Trackbar_switch(int, void *)
{
switch_flag = g_nAlphaValueSlider_switch;
}