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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>
Qt Toolkit - drawdemo/drawdemo.cpp example file
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<h1 align=center>Draw Demo</h1><br clear="all">
This example demonstrates several drawing functions and printer output.
You can easily add you own drawing functions. See "ourDrawFunctions".
<hr>
Implementation:
<pre>/****************************************************************************
** $Id: qt/examples/drawdemo/drawdemo.cpp 2.3.1 edited 2001-04-26 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 name="qwidget.h"></a><a href="qwidget-h.html">qwidget.h</a>>
#include <<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>>
#include <<a name="qprinter.h"></a><a href="qprinter-h.html">qprinter.h</a>>
#include <<a name="qpushbutton.h"></a><a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a name="qradiobutton.h"></a><a href="qradiobutton-h.html">qradiobutton.h</a>>
#include <<a name="qbuttongroup.h"></a><a href="qbuttongroup-h.html">qbuttongroup.h</a>>
#include <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
#include <math.h>
//
// This function draws a color wheel.
// The coordinate system x=(0..500), y=(0..500) spans the paint device.
//
void drawColorWheel( <a name="QPainter"></a><a href="qpainter.html">QPainter</a> *p )
{
<a name="QFont"></a><a href="qfont.html">QFont</a> f( "times", 18, QFont::Bold );
p-><a name="setFont"></a><a href="qpainter.html#e4d6b7">setFont</a>( f );
p-><a name="setPen"></a><a href="qpainter.html#0a6aff">setPen</a>( Qt::black );
p-><a name="setWindow"></a><a href="qpainter.html#797026">setWindow</a>( 0, 0, 500, 500 ); // defines coordinate system
for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles
<a name="QWMatrix"></a><a href="qwmatrix.html">QWMatrix</a> matrix;
matrix.<a name="translate"></a><a href="qwmatrix.html#226fc6">translate</a>( 250.0F, 250.0F ); // move to center
matrix.<a name="shear"></a><a href="qwmatrix.html#8eb34f">shear</a>( 0.0F, 0.3F ); // twist it
matrix.<a name="rotate"></a><a href="qwmatrix.html#84df75">rotate</a>( (float)i*10 ); // rotate 0,10,20,.. degrees
p-><a name="setWorldMatrix"></a><a href="qpainter.html#f4a354">setWorldMatrix</a>( matrix ); // use this world matrix
<a name="QColor"></a><a href="qcolor.html">QColor</a> c;
c.<a name="setHsv"></a><a href="qcolor.html#ad075d">setHsv</a>( i*10, 255, 255 ); // rainbow effect
p-><a name="setBrush"></a><a href="qpainter.html#38e68f">setBrush</a>( c ); // solid fill with color c
p-><a name="drawRect"></a><a href="qpainter.html#b29a16">drawRect</a>( 70, -10, 80, 10 ); // draw the rectangle
<a name="QString"></a><a href="qstring.html">QString</a> n;
n.<a name="sprintf"></a><a href="qstring.html#2eb9bc">sprintf</a>( "H=%d", i*10 );
p-><a name="drawText"></a><a href="qpainter.html#8a59ed">drawText</a>( 80+70+5, 0, n ); // draw the hue number
}
}
//
// This function draws a few lines of text using different fonts.
//
void drawFonts( <a href="qpainter.html">QPainter</a> *p )
{
static const char *fonts[] = { "Helvetica", "Courier", "Times", 0 };
static int sizes[] = { 10, 12, 18, 24, 36, 0 };
int f = 0;
int y = 0;
while ( fonts[f] ) {
int s = 0;
while ( sizes[s] ) {
<a href="qfont.html">QFont</a> font( fonts[f], sizes[s] );
p-><a href="qpainter.html#e4d6b7">setFont</a>( font );
<a name="QFontMetrics"></a><a href="qfontmetrics.html">QFontMetrics</a> fm = p-><a name="fontMetrics"></a><a href="qpainter.html#f572a5">fontMetrics</a>();
y += fm.<a name="ascent"></a><a href="qfontmetrics.html#401f81">ascent</a>();
p-><a href="qpainter.html#8a59ed">drawText</a>( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" );
y += fm.<a name="descent"></a><a href="qfontmetrics.html#a71895">descent</a>();
s++;
}
f++;
}
}
//
// This function draws some shapes
//
void drawShapes( <a href="qpainter.html">QPainter</a> *p )
{
<a name="QBrush"></a><a href="qbrush.html">QBrush</a> b1( Qt::blue );
<a href="qbrush.html">QBrush</a> b2( Qt::green, Qt::Dense6Pattern ); // green 12% fill
<a href="qbrush.html">QBrush</a> b3( Qt::NoBrush ); // void brush
<a href="qbrush.html">QBrush</a> b4( Qt::CrossPattern ); // black cross pattern
p-><a href="qpainter.html#0a6aff">setPen</a>( Qt::red );
p-><a href="qpainter.html#38e68f">setBrush</a>( b1 );
p-><a href="qpainter.html#b29a16">drawRect</a>( 10, 10, 200, 100 );
p-><a href="qpainter.html#38e68f">setBrush</a>( b2 );
p-><a name="drawRoundRect"></a><a href="qpainter.html#af3126">drawRoundRect</a>( 10, 150, 200, 100, 20, 20 );
p-><a href="qpainter.html#38e68f">setBrush</a>( b3 );
p-><a name="drawEllipse"></a><a href="qpainter.html#06ff17">drawEllipse</a>( 250, 10, 200, 100 );
p-><a href="qpainter.html#38e68f">setBrush</a>( b4 );
p-><a name="drawPie"></a><a href="qpainter.html#dc4acb">drawPie</a>( 250, 150, 200, 100, 45*16, 90*16 );
}
typedef void (*draw_func)(<a href="qpainter.html">QPainter</a>*);
struct DrawThing {
draw_func f;
const char *name;
};
//
// You can add your draw function here.
// Leave the zeros at the end of the array!
//
DrawThing ourDrawFunctions[] = {
{ drawColorWheel, "Draw color wheel" },
{ drawFonts, "Draw fonts" },
{ drawShapes, "Draw shapes" },
{ 0, 0 } };
//
// DrawView has installable draw routines, just add a function pointer
// and a text in the table above.
//
class DrawView : public QWidget
{
Q_OBJECT
public:
DrawView();
~DrawView();
public slots:
void updateIt( int );
void printIt();
protected:
void drawIt( <a href="qpainter.html">QPainter</a> * );
void paintEvent( <a name="QPaintEvent"></a><a href="qpaintevent.html">QPaintEvent</a> * );
void resizeEvent( <a name="QResizeEvent"></a><a href="qresizeevent.html">QResizeEvent</a> * );
private:
<a name="QPrinter"></a><a href="qprinter.html">QPrinter</a> *printer;
<a name="QButtonGroup"></a><a href="qbuttongroup.html">QButtonGroup</a> *bgroup;
<a name="QPushButton"></a><a href="qpushbutton.html">QPushButton</a> *print;
int drawindex;
int maxindex;
};
//
// Construct the DrawView with buttons.
//
DrawView::DrawView()
{
<a name="setCaption"></a><a href="qwidget.html#d4f007">setCaption</a>( "Qt Draw Demo Application" );
<a name="setBackgroundColor"></a><a href="qwidget.html#721b7d">setBackgroundColor</a>( white );
// Create a button group to contain all buttons
bgroup = new <a href="qbuttongroup.html">QButtonGroup</a>( this );
bgroup-><a name="resize"></a><a href="qwidget.html#9ff9d8">resize</a>( 200, 200 );
<a name="connect"></a><a href="qobject.html#c2d209">connect</a>( bgroup, SIGNAL(clicked(int)), SLOT(<a name="updateIt"></a><a href="#193">updateIt</a>(int)) );
// Calculate the size for the radio buttons
int maxwidth = 80;
int i;
const char *n;
<a href="qfontmetrics.html">QFontMetrics</a> fm = bgroup-><a name="fontMetrics"></a><a href="qwidget.html#d0d02b">fontMetrics</a>();
for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
int w = fm.<a name="width"></a><a href="qfontmetrics.html#321192">width</a>( n );
maxwidth = QMAX(w,maxwidth);
}
maxwidth = maxwidth + 20; // add 20 pixels
for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
<a name="QRadioButton"></a><a href="qradiobutton.html">QRadioButton</a> *rb = new <a href="qradiobutton.html">QRadioButton</a>( n, bgroup );
rb-><a name="setGeometry"></a><a href="qwidget.html#0fac5c">setGeometry</a>( 10, i*30+10, maxwidth, 30 );
if ( i == 0 )
rb-><a name="setChecked"></a><a href="qradiobutton.html#11e2e3">setChecked</a>( TRUE );
}
drawindex = 0; // draw first thing
maxindex = i;
maxwidth += 40; // now size of bgroup
printer = new <a href="qprinter.html">QPrinter</a>;
// Create and setup the print button
print = new <a href="qpushbutton.html">QPushButton</a>( "Print...", bgroup );
print-><a name="resize"></a><a href="qpushbutton.html#5f0add">resize</a>( 80, 30 );
print-><a name="move"></a><a href="qpushbutton.html#0d7ae4">move</a>( maxwidth/2 - print-><a name="width"></a><a href="qwidget.html#576663">width</a>()/2, maxindex*30+20 );
<a href="qobject.html#c2d209">connect</a>( print, SIGNAL(clicked()), SLOT(<a name="printIt"></a><a href="#195">printIt</a>()) );
bgroup-><a href="qwidget.html#9ff9d8">resize</a>( maxwidth, print-><a name="y"></a><a href="qwidget.html#043386">y</a>()+print-><a name="height"></a><a href="qwidget.html#180786">height</a>()+10 );
<a name="resize"></a><a href="qwidget.html#9775bb">resize</a>( 640,300 );
}
//
// Clean up
//
DrawView::~DrawView()
{
#ifndef QT_NO_PRINTER
delete printer;
#endif
}
//
// Called when a radio button is clicked.
//
void <a name="193"></a>DrawView::updateIt( int index )
{
if ( index < maxindex ) {
drawindex = index;
<a name="update"></a><a href="qwidget.html#4a97ef">update</a>();
}
}
//
// Calls the drawing function as specified by the radio buttons.
//
void <a name="194"></a>DrawView::drawIt( <a href="qpainter.html">QPainter</a> *p )
{
(*ourDrawFunctions[drawindex].f)(p);
}
//
// Called when the print button is clicked.
//
void <a name="195"></a>DrawView::printIt()
{
#ifndef QT_NO_PRINTER
if ( printer-><a name="setup"></a><a href="qprinter.html#a36243">setup</a>( this ) ) {
<a href="qpainter.html">QPainter</a> paint;
if ( !paint.<a name="begin"></a><a href="qpainter.html#59f1bb">begin</a>( printer ) )
return;
<a name="drawIt"></a><a href="#194">drawIt</a>( &paint );
}
#endif
}
//
// Called when the widget needs to be updated.
//
void <a name="196"></a>DrawView::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
<a href="qpainter.html">QPainter</a> paint( this );
<a href=#194>drawIt</a>( &paint );
}
//
// Called when the widget has been resized.
// Moves the button group to the upper right corner
// of the widget.
void <a name="197"></a>DrawView::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * )
{
bgroup-><a name="move"></a><a href="qwidget.html#958bbe">move</a>( <a href="qwidget.html#576663">width</a>()-bgroup-><a href="qwidget.html#576663">width</a>(), 0 );
}
//
// Create and display our widget.
//
#include "drawdemo.moc"
int main( int argc, char **argv )
{
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> app( argc, argv );
DrawView draw;
app.<a name="setMainWidget"></a><a href="qapplication.html#11c921">setMainWidget</a>( &draw );
draw.<a name="show"></a><a href="qwidget.html#ccc8f7">show</a>();
return app.<a name="exec"></a><a href="qapplication.html#7076af">exec</a>();
}
</pre>
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<td>Copyright 2000 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.1</div>
</table></div></address></body></html>
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