OpenCV 不提供button,但您可以轻松地使用彩色矩形,并检查图像上的单击点是否在该矩形内。
请记住,OpenCV HighGui 非常简单,仅用于调试目的。您可能想使用 Qt 等功能齐全的图形库或类似库。
然而,这是一个小示例,显示一个(绿色)图像,顶部有一个按钮:
![enter image description here](https://i.stack.imgur.com/kD2wU.png)
单击该按钮将在标准输出上打印“Clicked”:
![enter image description here](https://i.stack.imgur.com/jcTi8.png)
Code:
#include <opencv2\opencv.hpp>
#include <iostream>
using namespace cv;
using namespace std;
Mat3b canvas;
string buttonText("Click me!");
string winName = "My cool GUI v0.1";
Rect button;
void callBackFunc(int event, int x, int y, int flags, void* userdata)
{
if (event == EVENT_LBUTTONDOWN)
{
if (button.contains(Point(x, y)))
{
cout << "Clicked!" << endl;
rectangle(canvas(button), button, Scalar(0,0,255), 2);
}
}
if (event == EVENT_LBUTTONUP)
{
rectangle(canvas, button, Scalar(200, 200, 200), 2);
}
imshow(winName, canvas);
waitKey(1);
}
int main()
{
// An image
Mat3b img(300, 300, Vec3b(0, 255, 0));
// Your button
button = Rect(0,0,img.cols, 50);
// The canvas
canvas = Mat3b(img.rows + button.height, img.cols, Vec3b(0,0,0));
// Draw the button
canvas(button) = Vec3b(200,200,200);
putText(canvas(button), buttonText, Point(button.width*0.35, button.height*0.7), FONT_HERSHEY_PLAIN, 1, Scalar(0,0,0));
// Draw the image
img.copyTo(canvas(Rect(0, button.height, img.cols, img.rows)));
// Setup callback function
namedWindow(winName);
setMouseCallback(winName, callBackFunc);
imshow(winName, canvas);
waitKey();
return 0;
}