[英]c++ QT and OpenCV. setMouseCallBack in QLabel?
I'm using the function setMouseCallback to extract the information about pixel coordinates at every mouse event. 我正在使用功能setMouseCallback来提取有关每个鼠标事件的像素坐标的信息。 The program I created works perfectly if I use openCV windows. 如果使用openCV窗口,则创建的程序可以完美运行。 Precisely: 正是:
image is cv::Mat; 图片是cv :: Mat;
cv::namedWindow("Original", WINDOW_NORMAL);
cv::imshow("Original", image);
cv::setMouseCallback("Original", mouseWrapper, NULL);
where 哪里
void esempio::onMouse(int event, int x, int y, int flags, void *param)
{
//---------------------------------------------------------
// Code to read the mouse event in the identification of a point
//---------------------------------------------------------
if (event == CV_EVENT_LBUTTONDOWN)
{
std::cout << "1: " << x << "," << y << std::endl;
pp_m.x=x;
pp_m.y=y;
}
}
void mouseWrapper( int event, int x, int y, int flags, void* param )
{
esempio * mainWin = (esempio *)(param);
mainWin->onMouse(event,x,y,flags,0);
}
Now, I would like to use the same code in a QLabel created in my interface. 现在,我想在界面中创建的QLabel中使用相同的代码。 I tried to use the function setWindowTitle to change the name of the QLabel in this way: 我试图通过以下方式使用函数setWindowTitle更改QLabel的名称:
ui->label_show->setWindowTitle("Test");
cv::setMouseCallback("Test", mouseWrapper, NULL);
but this approach seems not adequate. 但是这种方法似乎还不够。
How can I indicate to the function setMouseCallback to work on the desired QLabel? 如何指示函数setMouseCallback在所需的QLabel上工作?
Thanks 谢谢
This can be hard because: 这可能很困难,因为:
I don't see why not use Qt's own means to react on mouse events. 我不明白为什么不使用Qt自己的方式对鼠标事件做出反应。
Call ui->label_show->installEventFilter(this)
in constructor of your form and implement virtual eventFilter
function. 在表单的构造函数中调用ui->label_show->installEventFilter(this)
并实现虚拟eventFilter
函数。 In this function you can use event
argument to retrieve event type and mouse coordinates (after casting to QMouseEvent
). 在此函数中,您可以使用event
参数来检索事件类型和鼠标坐标(在强制转换为QMouseEvent
)。
See event filters . 请参阅事件过滤器 。
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