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