Opencv用鼠标绘制椭圆

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

#define WINDOW_NAME "鼠标事件窗口"
#define EVENT_WINDOW "滚动条窗口"
#define PI 3.1415926

using namespace std;
using namespace cv;

void DrawEllipse(Mat &img, Point center, Size_<double> size, double angle, Scalar color, int thickness = 2, int lineType = 8);
void DrawRectangle(Mat &img, Rect box);
void onMouse(int event, int x, int y, int flag, void *param);
void on_Trackbar_b(int, void *);
void on_Trackbar_g(int, void *);
void on_Trackbar_r(int, void *);
void on_Trackbar_switch(int, void *);
void on_Trackbar_proportion(int, void *);
void on_Trackbar_Thick(int, void *);

Rect g_rectangle;
bool g_bDrawingBox = false;
RNG g_rng(12345);
Point g_startpoint;
double g_angle;
Point g_currentPoint;
Size_<double> g_currentSize;
Scalar g_EllCurColor;
double proportion = 0;
int EllCurThick;

//滑动条
int g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r, g_nAlphaValueSlider_switch, g_nAlphaValueSlider_pro,
g_EllCurThick;
const int g_nMaxAlphaValue = 255, g_switch = 1, g_proportion_max = 11, g_EllCurThickMax = 100;
int switch_flag = 0;

int main()
{
Mat srcImage(600, 800, CV_8UC3);
Mat winImage(100,600, CV_8UC3);
Mat tempImage;

srcImage = Scalar::all(0);
winImage = Scalar::all(0);

/*srcImage.copyTo(tempImage);*/

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

g_nAlphaValueSlider_b = 50;
g_nAlphaValueSlider_g = 50;
g_nAlphaValueSlider_r = 50;
g_nAlphaValueSlider_switch = 0;
g_nAlphaValueSlider_pro = 0;
namedWindow(EVENT_WINDOW);
imshow(EVENT_WINDOW, winImage);
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("Thick", EVENT_WINDOW, &g_EllCurThick, g_EllCurThickMax, on_Trackbar_Thick);
on_Trackbar_switch(g_EllCurThick, 0);
createTrackbar("proportion", EVENT_WINDOW, &g_nAlphaValueSlider_pro, g_proportion_max, on_Trackbar_proportion);
on_Trackbar_switch(g_nAlphaValueSlider_pro, 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)
DrawEllipse(tempImage, g_startpoint, g_currentSize, g_angle, g_EllCurColor, EllCurThick);

imshow(EVENT_WINDOW, winImage);
imshow(WINDOW_NAME, tempImage);

if (!switch_flag)
break;

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

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

return 0;
}

void DrawEllipse(Mat &img, Point center, Size_<double> size, double angle, Scalar color, int thickness, int lineType)
{
ellipse(img, center, size, angle, 0, 360, color, thickness, lineType);
}

void DrawRectangle(Mat &img, Rect box)
{
rectangle(img, box.tl(), box.br(), Scalar(g_rng.uniform(0, 255), g_rng.uniform(0, 255), g_rng.uniform(0, 255)));
}

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

switch (event)
{
//移动鼠标的时候
case CV_EVENT_MOUSEMOVE:
{
if (g_bDrawingBox)
{
g_currentPoint = Point(x, y);
g_currentSize.width = pow((g_startpoint.x - g_currentPoint.x) *
(g_startpoint.x - g_currentPoint.x) + (g_startpoint.y - g_currentPoint.y) *
(g_startpoint.y - g_currentPoint.y), 0.5);
g_currentSize.height = g_currentSize.width / (proportion + 1);
g_angle = (double)(atan2f((float)(y - g_startpoint.y),
(float)(x - g_startpoint.x)) * 180 / PI);
}
}
break;
//点击鼠标左键时
case CV_EVENT_LBUTTONDOWN:
{
g_currentSize = Size(0, 0);
g_bDrawingBox = true;
g_startpoint = Point(x, y);
}
break;
//松开鼠标左键时
case CV_EVENT_LBUTTONUP:
{
g_bDrawingBox = false;

DrawEllipse(img, g_startpoint, g_currentSize, g_angle, g_EllCurColor, EllCurThick);
}
break;
}
}

void on_Trackbar_b(int, void *)
{
g_EllCurColor = Scalar(g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r);
}
void on_Trackbar_g(int, void *)
{
g_EllCurColor = Scalar(g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r);
}
void on_Trackbar_r(int, void *)
{
g_EllCurColor = Scalar(g_nAlphaValueSlider_b, g_nAlphaValueSlider_g, g_nAlphaValueSlider_r);
}
void on_Trackbar_switch(int, void *)
{
switch_flag = g_nAlphaValueSlider_switch;
}
void on_Trackbar_proportion(int, void *)
{
proportion = g_nAlphaValueSlider_pro;
}
void on_Trackbar_Thick(int, void *)
{
EllCurThick = g_EllCurThick;
}