C++ 我想让setmousecallback函数在鼠标左键仍然按下时连续传递坐标
我的代码工作正常,但当鼠标左键仍然按下时,它不会连续传递坐标。当鼠标移动时,它确实会通过坐标 对不起,我没有添加鼠标回调函数,我现在已经添加了它。 任何帮助都会有帮助。 代码:C++ 我想让setmousecallback函数在鼠标左键仍然按下时连续传递坐标,c++,opencv,image-processing,mouseevent,C++,Opencv,Image Processing,Mouseevent,我的代码工作正常,但当鼠标左键仍然按下时,它不会连续传递坐标。当鼠标移动时,它确实会通过坐标 对不起,我没有添加鼠标回调函数,我现在已经添加了它。 任何帮助都会有帮助。 代码: #包括 #包括 #包括 #包括 #包括 使用名称空间cv; 使用名称空间std; 点pt(-1,-1); bool-newCoords=false; void mouse_回调(int事件、int x、int y、int标志、void*param) { if(event==event_LBUTTONDOWN) { pt.
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使用名称空间cv;
使用名称空间std;
点pt(-1,-1);
bool-newCoords=false;
void mouse_回调(int事件、int x、int y、int标志、void*param)
{
if(event==event_LBUTTONDOWN)
{
pt.x=x;
pt.y=y;
newCoords=true;
}
else if(flag==EVENT\u flag\u LBUTTON&&EVENT==EVENT\u MOUSEMOVE){
pt.x=x;
pt.y=y;
newCoords=true;
}
}
int main(int argc,字符**argv)
{
字符串WindowName=“原始提要”;
namedWindow(窗口名、CV\u窗口大小自动调整);
Mat Orimg;
int帧_宽度=720;
内部框架高度=540;
视频捕获上限(0);
setMouseCallback(WindowName,鼠标回调);
封盖设置(CV、封盖、支架、框架宽度);
封盖套件(CV、封盖、支架、框架高度);
while(waitKey(30)!=27){
第二章(原);
if(pt.x!=-1&&pt.y!=-1)
{
圆(oriImg,pt,3,标量(0,0,255));
if(newCoords)
{
std::cout每当OS/GUI生成鼠标事件时,就会调用回调。每当鼠标状态(按钮、滚轮、位置等)发生变化时,就会生成此类事件——如果没有变化,则表示您已经知道(可以知道)当前状态
如果您想在多次迭代中以某种方式响应鼠标的稳定状态(例如,在静止时按住按钮),则必须自己处理
我对您的问题的理解如下:只要按住左键,就在显示的每一帧上光标的最新位置绘制圆圈
由于我们的帧速率很高,我们可以保持简单,只根据前一帧的点击/位置信息更新当前帧。用户将无法观察到这种轻微延迟
仅供后人使用:图像正在显示,只有在运行cv::waitKey
函数时才调用鼠标回调
下面列举了我们在每次迭代中可能遇到的情况,以及在下面的框架中我们应该如何应对这些情况:
在waitKey
- LMB从未释放(因此从未按下)->无事可做
- LMB至少被保持和释放一次(并因此多次按下)->在最后一次按下的位置画一个圆圈
LMB不是在进入时持有,而是在waitKey
- 按住LMB->在上次报告的鼠标位置绘制圆圈
LMB在进入时被持有,但在waitKey
- LMB至少保持和释放一次(并少按一次)->在最后一次按压的位置画圆圈
LMB在waitKey
- 按住LMB->在上次报告的鼠标位置绘制圆圈
基于此,我们需要跟踪:
- LMB被压下或释放的最后位置
- LMB当前是否被压制
- LMB是否在上一次迭代中发布(即,它被抑制,即使它不再是)
我们可以使用struct
保存此信息(由于用户数据参数,我们允许回调使用此信息):
鼠标回调将负责更新上述struct
- 当用户按下LMB时,记录位置并按下设置按钮
- 当用户释放LMB时,记录位置,点击设置按钮,设置按钮未保持
- 当鼠标移动并按住LMB时,记录位置
带有一些基本调试跟踪的回调示例实现如下所示:
void mouse_callback(int event, int x, int y, int flag, void* param)
{
mouse_state* state(static_cast<mouse_state*>(param));
if (event == cv::EVENT_LBUTTONDOWN) {
std::cout << "LMB down @ (" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
state->left_button_held = true;
} else if (event == cv::EVENT_LBUTTONUP) {
std::cout << "LMB up @(" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
state->left_button_held = false;
state->left_button_clicked = true;
} else if ((flag == cv::EVENT_FLAG_LBUTTON) && (event == cv::EVENT_MOUSEMOVE)) {
std::cout << "LMB held, mouse moved to (" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
}
}
处理循环将非常简单:
读取新帧,故障时退出循环
检查最后一个鼠标状态。如果按住LMB或单击LMB,则在记录的位置绘制圆圈
重置每次迭代鼠标状态标志
显示图像,更新鼠标状态信息
这可能如下所示:
for (;;) {
// We can have `image` here, since `cap.read` always gives us
// a reference to its internal buffer
cv::Mat image;
if (!cap.read(image)) {
std::cerr << "Failed to read image, exiting...\n";
break; // Failed to read image, nothing else to do
}
if (ms.left_button_clicked || ms.left_button_held) {
std::cout << "Current position: " << ms.position << "\n";
cv::circle(image, ms.position, 3, cv::Scalar(0, 0, 255));
cv::circle(image, ms.position, 10, cv::Scalar(0, 0, 255), 2);
}
ms.new_iteration();
cv::imshow(WINDOW_NAME, image);
if (cv::waitKey(30) == 27) {
std::cout << "Esc pressed, exiting...\n";
break;
}
}
(;;)的{
//我们这里可以有“image”,因为“cap.read”总是给我们
//对其内部缓冲区的引用
cv::Mat图像;
如果(!cap.read(图像)){
STR::CARR是“代码”NeXCOORDS 在别处初始化的吗?我猜想在LeavyMouthPress上分配<代码> NeXCORDS=真/<代码>将解决您的问题。请提供一个-现在“代码> Pt<代码>是不好的,整个代码的执行< MouSeSeCalBuff[/Case]不见了。嘿,丹马克,我已经填空了,有什么建议吗?帮帮忙。嘿@bruglesco,在leftMousePress上指定newCoords=true不起作用。有更好的主意吗?嗨@DanMašek,非常感谢,我终于找到了我想要的。再次感谢你。祝你愉快。
void mouse_callback(int event, int x, int y, int flag, void* param)
{
mouse_state* state(static_cast<mouse_state*>(param));
if (event == cv::EVENT_LBUTTONDOWN) {
std::cout << "LMB down @ (" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
state->left_button_held = true;
} else if (event == cv::EVENT_LBUTTONUP) {
std::cout << "LMB up @(" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
state->left_button_held = false;
state->left_button_clicked = true;
} else if ((flag == cv::EVENT_FLAG_LBUTTON) && (event == cv::EVENT_MOUSEMOVE)) {
std::cout << "LMB held, mouse moved to (" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
}
}
mouse_state ms;
cv::setMouseCallback(WINDOW_NAME, mouse_callback, &ms);
for (;;) {
// We can have `image` here, since `cap.read` always gives us
// a reference to its internal buffer
cv::Mat image;
if (!cap.read(image)) {
std::cerr << "Failed to read image, exiting...\n";
break; // Failed to read image, nothing else to do
}
if (ms.left_button_clicked || ms.left_button_held) {
std::cout << "Current position: " << ms.position << "\n";
cv::circle(image, ms.position, 3, cv::Scalar(0, 0, 255));
cv::circle(image, ms.position, 10, cv::Scalar(0, 0, 255), 2);
}
ms.new_iteration();
cv::imshow(WINDOW_NAME, image);
if (cv::waitKey(30) == 27) {
std::cout << "Esc pressed, exiting...\n";
break;
}
}
#include <opencv2/opencv.hpp>
#include <iostream>
struct mouse_state
{
mouse_state()
: position(-1, -1)
, left_button_held(false)
, left_button_clicked(false)
{}
void new_iteration()
{
left_button_clicked = false;
}
cv::Point2i position; // Last position where the LMB was down
bool left_button_held; // Is the LMB down right now?
bool left_button_clicked; // Was the LMB down in the last iteration?
};
void mouse_callback(int event, int x, int y, int flag, void* param)
{
mouse_state* state(static_cast<mouse_state*>(param));
if (event == cv::EVENT_LBUTTONDOWN) {
std::cout << "LMB down @ (" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
state->left_button_held = true;
} else if (event == cv::EVENT_LBUTTONUP) {
std::cout << "LMB up @(" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
state->left_button_held = false;
state->left_button_clicked = true;
} else if ((flag == cv::EVENT_FLAG_LBUTTON) && (event == cv::EVENT_MOUSEMOVE)) {
std::cout << "LMB held, mouse moved to (" << x << "," << y << ")\n";
state->position = cv::Point2i(x, y);
}
}
int main(int argc, char** argv)
{
cv::String const WINDOW_NAME("Original Feed");
cv::namedWindow(WINDOW_NAME, CV_WINDOW_AUTOSIZE);
mouse_state ms;
cv::setMouseCallback(WINDOW_NAME, mouse_callback, &ms);
int const FRAME_WIDTH(720);
int const FRAME_HEIGHT(540);
cv::VideoCapture cap(0);
if (!cap.isOpened()) {
std::cerr << "Unable to open camera, exiting...\n";
return -1;
}
cap.set(CV_CAP_PROP_FRAME_WIDTH, FRAME_WIDTH);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, FRAME_HEIGHT);
for (;;) {
// We can have `image` here, since `cap.read` always gives us
// a reference to its internal buffer
cv::Mat image;
if (!cap.read(image)) {
std::cerr << "Failed to read image, exiting...\n";
break; // Failed to read image, nothing else to do
}
if (ms.left_button_clicked || ms.left_button_held) {
std::cout << "Current position: " << ms.position << "\n";
cv::circle(image, ms.position, 3, cv::Scalar(0, 0, 255));
cv::circle(image, ms.position, 10, cv::Scalar(0, 0, 255), 2);
}
ms.new_iteration();
cv::imshow(WINDOW_NAME, image);
if (cv::waitKey(30) == 27) {
std::cout << "Esc pressed, exiting...\n";
break;
}
}
return 0;
}