From bd0f3345a938b35ce6a12f6150373b0955b8dd12 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Sun, 10 Jul 2011 15:24:15 -0500
Subject: Add Qt3 development HEAD version

---
 examples/drawlines/connect.cpp | 132 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 examples/drawlines/connect.cpp

(limited to 'examples/drawlines/connect.cpp')

diff --git a/examples/drawlines/connect.cpp b/examples/drawlines/connect.cpp
new file mode 100644
index 0000000..e6e53c7
--- /dev/null
+++ b/examples/drawlines/connect.cpp
@@ -0,0 +1,132 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  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 QWidget
+{
+public:
+    ConnectWidget( QWidget *parent=0, const char *name=0 );
+   ~ConnectWidget();
+protected:
+    void	paintEvent( QPaintEvent * );
+    void	mousePressEvent( QMouseEvent *);
+    void	mouseReleaseEvent( QMouseEvent *);
+    void	mouseMoveEvent( QMouseEvent *);
+private:
+    QPoint     *points;				// point array
+    QColor     *colors;				// color array
+    int		count;				// count = number of points
+    bool	down;				// TRUE if mouse down
+};
+
+
+//
+// Constructs a ConnectWidget.
+//
+
+ConnectWidget::ConnectWidget( QWidget *parent, const char *name )
+    : QWidget( 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] = QColor( rand()&255, rand()&255, rand()&255 );
+}
+
+ConnectWidget::~ConnectWidget()
+{
+    delete[] points;				// cleanup
+    delete[] colors;
+}
+
+
+//
+// Handles paint events for the connect widget.
+//
+
+void ConnectWidget::paintEvent( QPaintEvent * )
+{
+    QPainter 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( QMouseEvent * )
+{
+    down = TRUE;
+    count = 0;					// start recording points
+    erase();					// erase widget contents
+}
+
+
+//
+// Handles mouse release events for the connect widget.
+//
+
+void ConnectWidget::mouseReleaseEvent( QMouseEvent * )
+{
+    down = FALSE;				// done recording points
+    update();					// draw the lines
+}
+
+
+//
+// Handles mouse move events for the connect widget.
+//
+
+void ConnectWidget::mouseMoveEvent( QMouseEvent *e )
+{
+    if ( down && count < MAXPOINTS ) {
+	QPainter 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 )
+{
+    QApplication a( argc, argv );
+    ConnectWidget connect;
+#ifndef QT_NO_WIDGET_TOPEXTRA   // for Qt/Embedded minimal build
+    connect.setCaption( "Qt Example - Draw lines");
+#endif
+    a.setMainWidget( &connect );
+    connect.show();
+    return a.exec();
+}
-- 
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