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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/drawlines-example.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/drawlines-example.html')
| -rw-r--r-- | doc/html/drawlines-example.html | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/doc/html/drawlines-example.html b/doc/html/drawlines-example.html new file mode 100644 index 0000000..5ff28e3 --- /dev/null +++ b/doc/html/drawlines-example.html @@ -0,0 +1,186 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/drawlines/drawlines.doc:5 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>Connect the Points</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Connect the Points</h1> + + +<p> +This example shows very simple mouse-based user interaction and +painting without any world transform matrix or other advanced +features. Run the program, click the button, move the mouse, +release the button, and watch the lines get drawn. +<p> <hr> +<p> Implementation: +<p> <pre>/**************************************************************************** +** $Id: qt/connect.cpp 3.3.8 edited Jan 11 14:37 $ +** +** Copyright (C) 1992-2007 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 <<a href="qwidget-h.html">qwidget.h</a>> +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <stdlib.h> + + +const int MAXPOINTS = 2000; // maximum number of points +const int MAXCOLORS = 40; + + +// +// ConnectWidget - draws connected lines +// + +class ConnectWidget : public <a href="qwidget.html">QWidget</a> +{ +public: + ConnectWidget( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 ); + ~ConnectWidget(); +protected: + void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * ); + void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *); + void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> *); + void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> *); +private: + <a href="qpoint.html">QPoint</a> *points; // point array + <a href="qcolor.html">QColor</a> *colors; // color array + int count; // count = number of points + bool down; // TRUE if mouse down +}; + + +// +// Constructs a ConnectWidget. +// + +<a name="f475"></a>ConnectWidget::ConnectWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name ) + : <a href="qwidget.html">QWidget</a>( parent, name, WStaticContents ) +{ + <a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( white ); // white background + count = 0; + down = FALSE; + points = new <a href="qpoint.html">QPoint</a>[MAXPOINTS]; + colors = new <a href="qcolor.html">QColor</a>[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. +// + +<a name="x1661"></a>void ConnectWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * ) +{ + <a href="qpainter.html">QPainter</a> paint( this ); + for ( int i=0; i<count-1; i++ ) { // connect all points + for ( int j=i+1; j<count; j++ ) { + paint.<a href="qpainter.html#setPen">setPen</a>( colors[rand()%MAXCOLORS] ); // set random pen color +<a name="x1655"></a> paint.<a href="qpainter.html#drawLine">drawLine</a>( points[i], points[j] ); // draw line + } + } +} + + +// +// Handles mouse press events for the connect widget. +// + +<a name="x1659"></a>void ConnectWidget::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * ) +{ + down = TRUE; + count = 0; // start recording points + <a href="qwidget.html#erase">erase</a>(); // erase widget contents +} + + +// +// Handles mouse release events for the connect widget. +// + +<a name="x1660"></a>void ConnectWidget::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * ) +{ + down = FALSE; // done recording points + <a href="qwidget.html#update">update</a>(); // draw the lines +} + + +// +// Handles mouse move events for the connect widget. +// + +<a name="x1658"></a>void ConnectWidget::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e ) +{ + if ( down && count < MAXPOINTS ) { + <a href="qpainter.html">QPainter</a> paint( this ); +<a name="x1654"></a> points[count++] = e-><a href="qmouseevent.html#pos">pos</a>(); // add point +<a name="x1656"></a> paint.<a href="qpainter.html#drawPoint">drawPoint</a>( e-><a href="qmouseevent.html#pos">pos</a>() ); // plot point + } +} + + +// +// Create and display a ConnectWidget. +// + +int main( int argc, char **argv ) +{ + <a href="qapplication.html">QApplication</a> a( argc, argv ); + ConnectWidget connect; +#ifndef QT_NO_WIDGET_TOPEXTRA // for Qt/Embedded minimal build + connect.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Draw lines"); +#endif + a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &connect ); + connect.<a href="qwidget.html#show">show</a>(); + return a.<a href="qapplication.html#exec">exec</a>(); +} +</pre> + +<p>See also <a href="examples.html">Examples</a>. + +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |