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/***************************************************************************
* $Id$
**
* Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
* This file is part of an example program for Qt. This example
* program may be used, distributed and modified without limitation.
**
****************************************************************************/
import org.kde.qt.*;
import java.util.Random;
//
// ConnectWidget - draws connected lines
//
class ConnectWidget extends QWidget
{
static final int MAXPOINTS = 2000; // maximum number of points
static final int MAXCOLORS = 40;
private QPoint[] points; // point array
private QColor[] colors; // color array
private int count; // count = number of points
private boolean down; // true if mouse down
private Random generator = new Random(System.currentTimeMillis());
//
// Constructs a ConnectWidget.
//
public ConnectWidget( )
{
this(null, null);
}
public ConnectWidget( QWidget parent, String name )
{
super( parent, name, WStaticContents );
setBackgroundColor( white() ); // white background
count = 0;
down = false;
points = new QPoint[MAXPOINTS];
colors = new QColor[MAXCOLORS];
for ( int i=0; i<MAXCOLORS; i++ ) // init color array
colors[i] = new QColor( generator.nextInt(255), generator.nextInt(255), generator.nextInt(255) );
}
//
// Handles paint events for the connect widget.
//
protected void paintEvent( QPaintEvent e )
{
QPainter paint = new QPainter( this );
for ( int i=0; i<count-1; i++ ) { // connect all points
for ( int j=i+1; j<count; j++ ) {
paint.setPen( colors[generator.nextInt(MAXCOLORS)] ); // set random pen color
paint.drawLine( points[i], points[j] ); // draw line
}
}
paint.end();
}
//
// Handles mouse press events for the connect widget.
//
protected void mousePressEvent( QMouseEvent e )
{
down = true;
count = 0; // start recording points
erase(); // erase widget contents
}
//
// Handles mouse release events for the connect widget.
//
protected void mouseReleaseEvent( QMouseEvent e )
{
down = false; // done recording points
update(); // draw the lines
}
//
// Handles mouse move events for the connect widget.
//
protected void mouseMoveEvent( QMouseEvent e )
{
if ( down && count < MAXPOINTS ) {
QPainter paint = new QPainter( this );
points[count++] = new QPoint(e.pos()); // add point
paint.drawPoint( e.pos() ); // plot point
paint.end();
}
}
//
// Create and display a ConnectWidget.
//
public static void main( String[] args )
{
QApplication a = new QApplication( args );
ConnectWidget connect = new ConnectWidget();
connect.setCaption( "Qt Example - Draw lines");
a.setMainWidget( connect );
connect.show();
a.exec();
return;
}
static {
qtjava.initialize();
}
}
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