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# 1  
Old 09-16-2008
read position mouse cursor

Hi to all!
I'm a teacher of maths and physics in an italian high school in Milan, Italy.
I need a simple program that read the position of mouse cursor in function of time and write the coordinates in a text file. The time resolution have to be something like 1/10 sec or better (I have to know this parameter in advance). I can do that with a macro in labview but I can't buy that program. This work will be a part of physics lab in my classroom: we want to plot oscillation (in function of time) of a pendulum followed by an optical mouse.
thank you in advance for help!

Christian Bonfanti
# 2  
Old 09-24-2008
It's probably better to use a modern framework such as Qt or GTK+ but Googling brought up a few half-promising links about raw X11 mouse coordinates.

X11 Programming - Ubuntu Forums
How to get mouse's position? - Qt Centre Forum

I don't know anything about X11 really but hopefully at least this is a start.
# 3  
Old 11-04-2008

This is the complete code for a Qt application I threw together in about ten minutes (called crosshair) which displays the current mouse coordinates in a window. You might be able to pull enough out of it to be useful. This is Qt 3.1, but Qt 4 is not a great deal different. You will need the Qt development libraries, not just the runtimes. The code comprises two files, crosshair.h and crosshair.cpp.


#include <qwidget.h>
#include <qstring.h>
#include <qlabel.h>
#include <qevent.h>

class Crosshair : public QLabel

    Crosshair(QWidget *parent=0);

    void mousePressEvent(QMouseEvent *);

    QTimer         *timer;

private slots:
    void timerfire();



#include <qapplication.h>
#include <qpushbutton.h>
#include <qtimer.h>
#include <qcursor.h>
#include <iostream>
#include "crosshair.h"

using namespace std;

int main(int argc,char **argv)
    QApplication a(argc,argv);

    Crosshair mousepos;

    return a.exec();

Crosshair::Crosshair(QWidget *parent) : QLabel(parent)
    timer=new QTimer(this);

void Crosshair::mousePressEvent(QMouseEvent *)

void Crosshair::timerfire()
    QPoint p=QCursor::pos();

To build this, put both files in a directory called crosshair. cd to that directory and type
qmake -project

This does nothing more complex than inherit from a QLabel, set a timer to run 20x a second, grab the current cursor coordinates and write them into the label's text. Clicking in the window closes it. I use it for fixing up alignment bugs in JavaScript when I'm laying out objects.

You could open a file in the Crosshair class's constructor to store your data, and use gettimeofday(2) to get a timestamp. Nothing says Qt has to run in GUI mode (you can tell it explicitly not to in the QApplication constructor).

Qt from Trolltech: http://doc.trolltech.com
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