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365 lines
14 KiB
365 lines
14 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/drawdemo/drawdemo.doc:4 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Draw Demo</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Draw Demo</h1>
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<p>
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This example demonstrates several drawing functions and printer output.
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You can easily add you own drawing functions.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/drawdemo.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 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 <<a href="qwidget-h.html">qwidget.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qprinter-h.html">qprinter.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qradiobutton-h.html">qradiobutton.h</a>>
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#include <<a href="qbuttongroup-h.html">qbuttongroup.h</a>>
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <math.h>
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//
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// First we define the functionality our demo should present
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// to the user. You might add different demo-modes if you wish so.
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//
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//
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// This function draws a color wheel.
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// The coordinate system x=(0..500), y=(0..500) spans the paint device.
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//
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void drawColorWheel( <a href="qpainter.html">QPainter</a> *p )
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{
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<a href="qfont.html">QFont</a> f( "times", 18, QFont::Bold );
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<a name="x1075"></a> p-><a href="qpainter.html#setFont">setFont</a>( f );
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<a name="x1076"></a> p-><a href="qpainter.html#setPen">setPen</a>( Qt::black );
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<a name="x1077"></a> p-><a href="qpainter.html#setWindow">setWindow</a>( 0, 0, 500, 500 ); // defines coordinate system
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for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles
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<a href="qwmatrix.html">QWMatrix</a> matrix;
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<a name="x1097"></a> matrix.<a href="qwmatrix.html#translate">translate</a>( 250.0F, 250.0F ); // move to center
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<a name="x1096"></a> matrix.<a href="qwmatrix.html#shear">shear</a>( 0.0F, 0.3F ); // twist it
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<a name="x1095"></a> matrix.<a href="qwmatrix.html#rotate">rotate</a>( (float)i*10 ); // rotate 0,10,20,.. degrees
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<a name="x1078"></a> p-><a href="qpainter.html#setWorldMatrix">setWorldMatrix</a>( matrix ); // use this world matrix
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<a href="qcolor.html">QColor</a> c;
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<a name="x1063"></a> c.<a href="qcolor.html#setHsv">setHsv</a>( i*10, 255, 255 ); // rainbow effect
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<a name="x1074"></a> p-><a href="qpainter.html#setBrush">setBrush</a>( c ); // solid fill with color c
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<a name="x1070"></a> p-><a href="qpainter.html#drawRect">drawRect</a>( 70, -10, 80, 10 ); // draw the rectangle
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<a href="qstring.html">QString</a> n;
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n.<a href="qstring.html#sprintf">sprintf</a>( "H=%d", i*10 );
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<a name="x1072"></a> p-><a href="qpainter.html#drawText">drawText</a>( 80+70+5, 0, n ); // draw the hue number
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}
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}
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//
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// This function draws a few lines of text using different fonts.
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//
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void drawFonts( <a href="qpainter.html">QPainter</a> *p )
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{
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static const char *fonts[] = { "Helvetica", "Courier", "Times", 0 };
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static int sizes[] = { 10, 12, 18, 24, 36, 0 };
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int f = 0;
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int y = 0;
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while ( fonts[f] ) {
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int s = 0;
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while ( sizes[s] ) {
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<a href="qfont.html">QFont</a> font( fonts[f], sizes[s] );
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p-><a href="qpainter.html#setFont">setFont</a>( font );
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<a name="x1073"></a> <a href="qfontmetrics.html">QFontMetrics</a> fm = p-><a href="qpainter.html#fontMetrics">fontMetrics</a>();
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<a name="x1064"></a> y += fm.<a href="qfontmetrics.html#ascent">ascent</a>();
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p-><a href="qpainter.html#drawText">drawText</a>( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" );
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<a name="x1065"></a> y += fm.<a href="qfontmetrics.html#descent">descent</a>();
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s++;
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}
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f++;
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}
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}
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//
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// This function draws some shapes
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//
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void drawShapes( <a href="qpainter.html">QPainter</a> *p )
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{
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<a href="qbrush.html">QBrush</a> b1( Qt::blue );
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<a href="qbrush.html">QBrush</a> b2( Qt::green, Qt::Dense6Pattern ); // green 12% fill
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<a href="qbrush.html">QBrush</a> b3( Qt::NoBrush ); // void brush
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<a href="qbrush.html">QBrush</a> b4( Qt::CrossPattern ); // black cross pattern
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p-><a href="qpainter.html#setPen">setPen</a>( Qt::red );
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p-><a href="qpainter.html#setBrush">setBrush</a>( b1 );
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p-><a href="qpainter.html#drawRect">drawRect</a>( 10, 10, 200, 100 );
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p-><a href="qpainter.html#setBrush">setBrush</a>( b2 );
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<a name="x1071"></a> p-><a href="qpainter.html#drawRoundRect">drawRoundRect</a>( 10, 150, 200, 100, 20, 20 );
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p-><a href="qpainter.html#setBrush">setBrush</a>( b3 );
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<a name="x1068"></a> p-><a href="qpainter.html#drawEllipse">drawEllipse</a>( 250, 10, 200, 100 );
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p-><a href="qpainter.html#setBrush">setBrush</a>( b4 );
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<a name="x1069"></a> p-><a href="qpainter.html#drawPie">drawPie</a>( 250, 150, 200, 100, 45*16, 90*16 );
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}
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typedef void (*draw_func)(QPainter*);
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struct DrawThing {
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draw_func f;
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const char *name;
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};
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//
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// All previously implemented functions are collected
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// in the following "table".
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// If you implement different functionality, your new draw
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// function must be assigned here with a function pointer and
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// description.
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// Leave the zeros at the end, they will be used
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// as markers referring to the end of the array.
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//
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DrawThing ourDrawFunctions[] = {
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// name of the function, title presented to the user
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{ drawColorWheel, "Draw color wheel" },
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{ drawFonts, "Draw fonts" },
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{ drawShapes, "Draw shapes" },
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{ 0, 0 } };
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class DrawView : public <a href="qwidget.html">QWidget</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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DrawView();
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~DrawView();
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public slots:
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void updateIt( int );
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void printIt();
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protected:
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void drawIt( <a href="qpainter.html">QPainter</a> * );
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
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void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
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private:
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<a href="qprinter.html">QPrinter</a> *printer;
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<a href="qbuttongroup.html">QButtonGroup</a> *bgroup;
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<a href="qpushbutton.html">QPushButton</a> *print;
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int drawindex;
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int maxindex;
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};
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//
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// Construct the DrawView with buttons.
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//
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<a name="f367"></a>DrawView::DrawView()
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{
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<a href="qwidget.html#setCaption">setCaption</a>( "Qt Draw Demo Application" );
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<a href="qwidget.html#setBackgroundMode">setBackgroundMode</a>(PaletteBase);
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// Create a button group to contain all buttons
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bgroup = new <a href="qbuttongroup.html">QButtonGroup</a>( this );
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<a name="x1088"></a> bgroup-><a href="qwidget.html#resize">resize</a>( 200, 200 );
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<a name="x1062"></a> <a href="qobject.html#connect">connect</a>( bgroup, SIGNAL(<a href="qbuttongroup.html#clicked">clicked</a>(int)), SLOT(updateIt(int)) );
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// Calculate the size for the radio buttons
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int maxwidth = 80;
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int maxheight = 10;
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int i;
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const char *n;
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<a name="x1084"></a> <a href="qfontmetrics.html">QFontMetrics</a> fm = bgroup-><a href="qwidget.html#fontMetrics">fontMetrics</a>();
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// Find out the longest function description.
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// Here we make use of the last "0,0"-entry in the
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// ourDrawFunctions-array.
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for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
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<a name="x1066"></a> int w = fm.<a href="qfontmetrics.html#width">width</a>( n );
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maxwidth = QMAX(w,maxwidth); // QMAX is a macro defined in qglobal.h
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// and returns the biggest of to values.
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// Due to its macro nature one should use it with care and with
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// constant parameters only.
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}
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maxwidth = maxwidth + 30; // allow 30 pixels for radiobuttons
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for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
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<a href="qradiobutton.html">QRadioButton</a> *rb = new <a href="qradiobutton.html">QRadioButton</a>( n, bgroup );
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<a name="x1091"></a> rb-><a href="qwidget.html#setGeometry">setGeometry</a>( 10, i*30+10, maxwidth, 30 );
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maxheight += 30;
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if ( i == 0 )
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<a name="x1082"></a> rb-><a href="qradiobutton.html#setChecked">setChecked</a>( TRUE );
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}
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maxheight += 10; // maxheight is now 10 pixels upper margin
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// plus number_of_drawfunctions * 30
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// plus 10 pixels lower margin
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drawindex = 0; // draw first thing
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maxindex = i;
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maxwidth += 20; // add some margin, this results in the
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// final width of bgroup
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bgroup-><a href="qwidget.html#resize">resize</a>( maxwidth, maxheight ); // resize bgroup to its final size
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// when no printersupport is provided
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// If -- at compile time -- printer support will be disabled,
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// we won't set up printing functionality.
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#ifndef QT_NO_PRINTER
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printer = new <a href="qprinter.html">QPrinter</a>;
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// Create and setup the print button
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print = new <a href="qpushbutton.html">QPushButton</a>( "Print...", bgroup );
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<a name="x1081"></a> print-><a href="qwidget.html#resize">resize</a>( 80, 30 );
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<a name="x1093"></a><a name="x1080"></a> print-><a href="qwidget.html#move">move</a>( maxwidth/2 - print-><a href="qwidget.html#width">width</a>()/2, maxindex*30+20 );
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<a href="qobject.html#connect">connect</a>( print, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), SLOT(printIt()) );
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// Resize bgroup to its final size when printersupport is given.
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<a name="x1094"></a><a name="x1085"></a> bgroup-><a href="qwidget.html#resize">resize</a>( maxwidth, print-><a href="qwidget.html#y">y</a>()+print-><a href="qwidget.html#height">height</a>()+10 );
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#endif
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<a href="qwidget.html#resize">resize</a>( 640,300 );
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}
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//
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// Clean up.
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//
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DrawView::~DrawView()
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{
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#ifndef QT_NO_PRINTER
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delete printer;
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#endif
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}
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//
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// Called when a radio button is clicked.
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//
|
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void <a name="f368"></a>DrawView::updateIt( int index )
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{
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if ( index < maxindex ) {
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drawindex = index;
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<a href="qwidget.html#update">update</a>();
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}
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}
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//
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// Calls the drawing function as specified by the radio buttons.
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//
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void <a name="f369"></a>DrawView::drawIt( <a href="qpainter.html">QPainter</a> *p )
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{
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(*ourDrawFunctions[drawindex].f)(p);
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}
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//
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// Called when the print button is clicked.
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//
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void <a name="f370"></a>DrawView::printIt()
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{
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<a name="x1079"></a> if ( printer-><a href="qprinter.html#setup">setup</a>( this ) ) {
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<a href="qpainter.html">QPainter</a> paint;
|
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<a name="x1067"></a> if( !paint.<a href="qpainter.html#begin">begin</a>( printer ) )
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return;
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drawIt( &paint );
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}
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}
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//
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// Called when the widget needs to be updated.
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//
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|
||
|
|
void DrawView::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
|
||
|
|
{
|
||
|
|
<a href="qpainter.html">QPainter</a> paint( this );
|
||
|
|
drawIt( &paint );
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// Called when the widget has been resized.
|
||
|
|
// Moves the button group to the upper right corner
|
||
|
|
// of the widget.
|
||
|
|
|
||
|
|
<a name="x1089"></a>void DrawView::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
|
||
|
|
{
|
||
|
|
<a name="x1086"></a> bgroup-><a href="qwidget.html#move">move</a>( <a href="qwidget.html#width">width</a>()-bgroup-><a href="qwidget.html#width">width</a>(), 0 );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//
|
||
|
|
// Create and display our widget.
|
||
|
|
//
|
||
|
|
|
||
|
|
#include "drawdemo.moc"
|
||
|
|
|
||
|
|
int main( int argc, char **argv )
|
||
|
|
{
|
||
|
|
<a href="qapplication.html">QApplication</a> app( argc, argv );
|
||
|
|
DrawView draw;
|
||
|
|
app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &draw );
|
||
|
|
draw.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Drawdemo");
|
||
|
|
draw.<a href="qwidget.html#show">show</a>();
|
||
|
|
return app.<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>
|