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/****************************************************************************
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include <qwidget.h>
#include <qpainter.h>
#include <qapplication.h>
#include <stdlib.h>
const int MAXPOINTS = 2000; // maximum number of points
const int MAXCOLORS = 40;
//
// ConnectWidget - draws connected lines
//
class ConnectWidget : public TQWidget
{
public:
ConnectWidget( TQWidget *parent=0, const char *name=0 );
~ConnectWidget();
protected:
void paintEvent( TQPaintEvent * );
void mousePressEvent( TQMouseEvent *);
void mouseReleaseEvent( TQMouseEvent *);
void mouseMoveEvent( TQMouseEvent *);
private:
TQPoint *points; // point array
TQColor *colors; // color array
int count; // count = number of points
bool down; // TRUE if mouse down
};
//
// Constructs a ConnectWidget.
//
ConnectWidget::ConnectWidget( TQWidget *parent, const char *name )
: TQWidget( parent, name, WStaticContents )
{
setBackgroundColor( white ); // white background
count = 0;
down = FALSE;
points = new TQPoint[MAXPOINTS];
colors = new TQColor[MAXCOLORS];
for ( int i=0; i<MAXCOLORS; i++ ) // init color array
colors[i] = TQColor( rand()&255, rand()&255, rand()&255 );
}
ConnectWidget::~ConnectWidget()
{
delete[] points; // cleanup
delete[] colors;
}
//
// Handles paint events for the connect widget.
//
void ConnectWidget::paintEvent( TQPaintEvent * )
{
TQPainter paint( this );
for ( int i=0; i<count-1; i++ ) { // connect all points
for ( int j=i+1; j<count; j++ ) {
paint.setPen( colors[rand()%MAXCOLORS] ); // set random pen color
paint.drawLine( points[i], points[j] ); // draw line
}
}
}
//
// Handles mouse press events for the connect widget.
//
void ConnectWidget::mousePressEvent( TQMouseEvent * )
{
down = TRUE;
count = 0; // start recording points
erase(); // erase widget contents
}
//
// Handles mouse release events for the connect widget.
//
void ConnectWidget::mouseReleaseEvent( TQMouseEvent * )
{
down = FALSE; // done recording points
update(); // draw the lines
}
//
// Handles mouse move events for the connect widget.
//
void ConnectWidget::mouseMoveEvent( TQMouseEvent *e )
{
if ( down && count < MAXPOINTS ) {
TQPainter paint( this );
points[count++] = e->pos(); // add point
paint.drawPoint( e->pos() ); // plot point
}
}
//
// Create and display a ConnectWidget.
//
int main( int argc, char **argv )
{
TQApplication a( argc, argv );
ConnectWidget connect;
#ifndef QT_NO_WIDGET_TOPEXTRA // for TQt/Embedded minimal build
connect.setCaption( "TQt Example - Draw lines");
#endif
a.setMainWidget( &connect );
connect.show();
return a.exec();
}
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