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Full Discussion: read position mouse cursor
Special Forums UNIX and Linux Applications read position mouse cursor Post 302254556 by daggilli on Tuesday 4th of November 2008 05:27:59 PM
Old 11-04-2008
Java
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.


crosshair.h:

Code:
#ifndef CROSSHAIR_H
#define CROSSHAIR_H
#include <qwidget.h>
#include <qstring.h>
#include <qlabel.h>
#include <qevent.h>

class Crosshair : public QLabel
{
Q_OBJECT

public:
    Crosshair(QWidget *parent=0);

protected:
    void mousePressEvent(QMouseEvent *);

private:
    QTimer         *timer;

private slots:
    void timerfire();
};

#endif

crosshair.cpp:

Code:
#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;

    a.setMainWidget(&mousepos);
    mousepos.show();
    return a.exec();
}

Crosshair::Crosshair(QWidget *parent) : QLabel(parent)
{
    setIndent(20);
    resize(100,30);
    move(1200,200);
    setText("0,0");
    timer=new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(timerfire()));
    timer->start(50,false);
}

void Crosshair::mousePressEvent(QMouseEvent *)
{
    qApp->quit();
}

void Crosshair::timerfire()
{
    QPoint p=QCursor::pos();
    this->setText(QString().sprintf("%d,%d",p.x(),p.y()));
}

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

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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LEARN ABOUT ULTRIX

cfb

cfb(4)							     Kernel Interfaces Manual							    cfb(4)

Name
       cfb - color bitmap graphics

Syntax
       device	 cfb0 at ibus?	vector cfbvint

Description
       The  video  subsystem  provides a half page or full page, user-accessible bitmap display for graphics.  The subsystem consists of a 1 Mbyte
       (color) block of dual port RAM, a mouse or tablet, a keyboard, and a video monitor.

       The subsystem device driver supports a hybrid terminal with three minor devices.  The first minor device emulates a glass tty with a screen
       that  appears  as  an 80-column by 56-row page that scrolls from the bottom.  This device is capable of being configured as the system con-
       sole.

       The second minor device is reserved for the mouse.  This device is a source of mouse state changes.  (A state change is defined as  an  X/Y
       axis mouse movement or button change.)  When opened, the driver couples movements of the mouse with the cursor.	Mouse position changes are
       filtered and translated into cursor position changes in an exponential manner.  Rapid movements result in large	cursor	position  changes.
       All cursor positions are range-checked to ensure that the cursor remains on the display.

       The  third  minor  device  provides  an access path for console output that does not disturb the graphics display.  The caller can open the
       device When this device is open, the graphics driver redirects console device output to the input buffer of this  device.   This  mechanism
       disables console output on the screen and saves the output for later display. This action preserves the graphic display integrity.

       Input and output on the first and third minor devices are processed by the standard line disciplines.

       The Hold Screen key is supported. The graphics driver treats this key as if CTRL/S or CTRL/Q has been entered. Pressing the Hold Screen key
       suspends the output (if it is not already suspended). To resume the output, press the Hold Screen key again.

Files
       Console terminal or graphics device

       Mouse or tablet graphics device

       Console message window for workstation

See Also
       console(4), devio(4), tty(4), ttys(5), MAKEDEV(8)

								       RISC								    cfb(4)
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