You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
tqt3/doc/html/picture-example.html

183 lines
8.4 KiB

<!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/picture/picture.doc:4 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Picture</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&nbsp;Classes</font></a>
| <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
| <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
| <a href="groups.html">
<font color="#004faf">Grouped&nbsp;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>Picture</h1>
<p>
This example shows how to make a picture, store it to a file, and read it as
a set of drawing commands.
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/picture.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 TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include &lt;<a href="qapplication-h.html">ntqapplication.h</a>&gt;
#include &lt;<a href="qpainter-h.html">ntqpainter.h</a>&gt;
#include &lt;<a href="qpicture-h.html">ntqpicture.h</a>&gt;
#include &lt;<a href="qpixmap-h.html">ntqpixmap.h</a>&gt;
#include &lt;<a href="tqwidget-h.html">tqwidget.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">ntqmessagebox.h</a>&gt;
#include &lt;<a href="qfile-h.html">ntqfile.h</a>&gt;
#include &lt;ctype.h&gt;
void paintCar( <a href="ntqpainter.html">TQPainter</a> *p ) // paint a car
{
<a href="ntqpointarray.html">TQPointArray</a> a;
<a href="ntqbrush.html">TQBrush</a> brush( TQt::yellow, TQt::SolidPattern );
<a name="x120"></a> p-&gt;<a href="ntqpainter.html#setBrush">setBrush</a>( brush ); // use solid, yellow brush
<a name="x125"></a> a.setPoints( 5, 50,50, 350,50, 450,120, 450,250, 50,250 );
<a name="x115"></a> p-&gt;<a href="ntqpainter.html#drawPolygon">drawPolygon</a>( a ); // draw car body
<a href="ntqfont.html">TQFont</a> f( "courier", 12, TQFont::Bold );
<a name="x121"></a> p-&gt;<a href="ntqpainter.html#setFont">setFont</a>( f );
<a href="ntqcolor.html">TQColor</a> windowColor( 120, 120, 255 ); // a light blue color
<a name="x108"></a> brush.<a href="ntqbrush.html#setColor">setColor</a>( windowColor ); // set this brush color
p-&gt;<a href="ntqpainter.html#setBrush">setBrush</a>( brush ); // set brush
<a name="x116"></a> p-&gt;<a href="ntqpainter.html#drawRect">drawRect</a>( 80, 80, 250, 70 ); // car window
<a name="x117"></a> p-&gt;<a href="ntqpainter.html#drawText">drawText</a>( 180, 80, 150, 70, TQt::AlignCenter, "-- TQt --\nTrolltech AS" );
<a href="ntqpixmap.html">TQPixmap</a> pixmap;
<a name="x124"></a> if ( pixmap.<a href="ntqpixmap.html#load">load</a>("flag.bmp") ) // load and draw image
<a name="x114"></a> p-&gt;<a href="ntqpainter.html#drawPixmap">drawPixmap</a>( 100, 85, pixmap );
<a name="x119"></a> p-&gt;<a href="ntqpainter.html#setBackgroundMode">setBackgroundMode</a>( TQt::OpaqueMode ); // set opaque mode
p-&gt;<a href="ntqpainter.html#setBrush">setBrush</a>( TQt::DiagCrossPattern ); // black diagonal cross pattern
<a name="x112"></a> p-&gt;<a href="ntqpainter.html#drawEllipse">drawEllipse</a>( 90, 210, 80, 80 ); // back wheel
p-&gt;<a href="ntqpainter.html#setBrush">setBrush</a>( TQt::CrossPattern ); // black cross fill pattern
p-&gt;<a href="ntqpainter.html#drawEllipse">drawEllipse</a>( 310, 210, 80, 80 ); // front wheel
}
class PictureDisplay : public <a href="tqwidget.html">TQWidget</a> // picture display widget
{
public:
PictureDisplay( const char *fileName );
~PictureDisplay();
protected:
void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * );
void keyPressEvent( <a href="qkeyevent.html">TQKeyEvent</a> * );
private:
<a href="ntqpicture.html">TQPicture</a> *pict;
<a href="tqstring.html">TQString</a> name;
};
<a name="f207"></a>PictureDisplay::PictureDisplay( const char *fileName )
{
pict = new <a href="ntqpicture.html">TQPicture</a>;
name = fileName;
<a name="x122"></a> if ( !pict-&gt;<a href="ntqpicture.html#load">load</a>(fileName) ) { // cannot load picture
delete pict;
pict = 0;
name.<a href="tqstring.html#sprintf">sprintf</a>( "Not able to load picture: %s", fileName );
}
}
PictureDisplay::~PictureDisplay()
{
delete pict;
}
void PictureDisplay::<a href="tqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * )
{
<a href="ntqpainter.html">TQPainter</a> paint( this ); // paint widget
if ( pict )
<a name="x113"></a> paint.<a href="ntqpainter.html#drawPicture">drawPicture</a>( *pict ); // draw picture
else
paint.<a href="ntqpainter.html#drawText">drawText</a>( <a href="tqwidget.html#rect">rect</a>(), AlignCenter, name );
}
<a name="x127"></a>void PictureDisplay::<a href="tqwidget.html#keyPressEvent">keyPressEvent</a>( <a href="qkeyevent.html">TQKeyEvent</a> *k )
{
<a name="x109"></a> switch ( tolower(k-&gt;<a href="qkeyevent.html#ascii">ascii</a>()) ) {
case 'r': // reload
pict-&gt;<a href="ntqpicture.html#load">load</a>( name );
<a href="tqwidget.html#update">update</a>();
break;
case 'q': // quit
<a name="x106"></a> TQApplication::<a href="ntqapplication.html#exit">exit</a>();
break;
}
}
int main( int argc, char **argv )
{
<a href="ntqapplication.html">TQApplication</a> a( argc, argv ); // TQApplication required!
const char *fileName = "car.pic"; // default picture file name
if ( argc == 2 ) // use argument as file name
fileName = argv[1];
if ( !TQFile::exists(fileName) ) {
<a href="ntqpicture.html">TQPicture</a> pict; // our picture
<a href="ntqpainter.html">TQPainter</a> paint; // our painter
<a name="x111"></a> paint.<a href="ntqpainter.html#begin">begin</a>( &amp;pict ); // begin painting onto picture
paintCar( &amp;paint ); // paint!
<a name="x118"></a> paint.<a href="ntqpainter.html#end">end</a>(); // painting done
<a name="x123"></a> pict.<a href="ntqpicture.html#save">save</a>( fileName ); // save picture
<a name="x110"></a> TQMessageBox::<a href="ntqmessagebox.html#information">information</a>(0, "TQt Example - Picture", "Saved. Run me again!");
return 0;
} else {
PictureDisplay test( fileName ); // create picture display
a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &amp;test); // set main widget
test.<a href="tqwidget.html#setCaption">setCaption</a>("TQt Example - Picture");
test.<a href="tqwidget.html#show">show</a>(); // show it
return a.<a href="ntqapplication.html#exec">exec</a>(); // start event loop
}
}
</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 &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>TQt 3.3.8</div>
</table></div></address></body>
</html>