widget_speed y is not subscribing rotational speed

[tonaaskarwur]

I'm trying to learn to make GUI with qt qreator (ros industrial) using your code. I found some errors in the y speed widget which should have been corresponding to rotational speed. It is not responding. I tried to edit the callback function from qnode.cpp, but I could't make it work. Do you have any ideas? Thank you

[chengyangkj]

I'm trying to learn to make GUI with qt qreator (ros industrial) using your code. I found some errors in the y speed widget which should have been corresponding to rotational speed. It is not responding. I tried to edit the callback function from qnode.cpp, but I could't make it work. Do you have any ideas? Thank you

To be precise, I'm not subscribing here to the rotational speed, it's just the y-axis speed. In the 143-line speedCallback() function of qnode.cpp,:

void QNode::speedCallback(const nav_msgs::Odometry::ConstPtr& msg) { emit speed_x(msg->twist.twist.linear.x); emit speed_y(msg->twist.twist.linear.y); }

send a custom signal to mainwindow.cpp, you can change the y-axis speed here to the raw value to send past, in mainWindow.cpp's slot_speed_x (double x) and slot_speed_y (double x) functions handle the signal sent over and update the UI display.

[tonaaskarwur]

Thank you for the advice. I did as you advised like this: (qnode.cpp) //Speed callback function void QNode::speedCallback(const nav_msgs::Odometry::ConstPtr& msg) { emit speed_x(msg->twist.twist.linear.x); emit speed_y(msg->twist.twist.linear.y); }

(mainwindow.cpp) void MainWindow::connections() { //connectSpeed signal connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_x(double))); connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_y(double)));

Now both widget are subscribing to the same speed variable in my display. Sorry but I don't understand how to change the y-axis speed to the raw value. I wanted the widget_speed_x to subscribe forward/backward speed and widget_speed_y to subscribe left/right speed. Thank you so much for your help, really.

[chengyangkj]

//connectSpeed signal connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_x(double))); connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_y(double)));

//connectSpeed signal connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_x(double))); connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_y(double))); All of you are linking here are speed_x (double) signals, so it will cause the y-axis speed to be the same as the x-axis.

The original code is： connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_x(double))); connect(&qnode,SIGNAL(speed_y(double)),this,SLOT(slot_speed_y(double)));

Only change this： void QNode::speedCallback(const nav_msgs::Odometry::ConstPtr& msg) { emit speed_x(msg->twist.twist.linear.x); emit speed_y(msg->twist.twist.linear.y); }

as：

void QNode::speedCallback(const nav_msgs::Odometry::ConstPtr& msg) { emit speed_x(msg->twist.twist.linear.x); emit speed_y(msg->twist.twist.angular.z); }

The z-axis angle speed was released to mainwindow.cpp ,slot_speed_y(double): So you need to change the ui display in the slot_speed_y function：

void MainWindow::slot_speed_y(double x) { if(x>=0) ui.label_dir_y->setText("正向"); else ui.label_dir_y->setText("反向"); m_DashBoard_y->setValue(abs(x*100)); }

[tonaaskarwur]

Thank you for your kind response.. so I changed as you mentioned. in mainwindow.cpp = ... //connectSpeed signal connect(&qnode,SIGNAL(speed_x(double)),this,SLOT(slot_speed_x(double))); connect(&qnode,SIGNAL(speed_y(double)),this,SLOT(slot_speed_y(double))); ... void MainWindow::slot_speed_x(double x) { if(x>=0) ui.label_dir_x->setText("正向"); else ui.label_dir_x->setText("反向");

m_DashBoard_x->setValue(abs(x*100));

} void MainWindow::slot_speed_y(double z) { if(z>=0) ui.label_dir_y->setText("正向"); else ui.label_dir_y->setText("反向");

m_DashBoard_y->setValue((z*100));

} ..

and qnode.cpp = ... //Speed callback function void QNode::speedCallback(const nav_msgs::Odometry::ConstPtr& msg) { emit speed_x(msg->twist.twist.linear.x); emit speed_y(msg->twist.twist.angular.z); } ...

When I run this, the y_speed_widget is responding, but it doesn't respond to the angular speed.