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<!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/drawdemo/drawdemo.doc:4 -->
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<title>Draw Demo</title>
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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>
<p>
This example demonstrates several drawing functions and printer output.
You can easily add you own drawing functions.
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/drawdemo.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 <<a href="qwidget-h.html">ntqwidget.h</a>>
#include <<a href="qpainter-h.html">ntqpainter.h</a>>
#include <<a href="qprinter-h.html">ntqprinter.h</a>>
#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
#include <<a href="qradiobutton-h.html">ntqradiobutton.h</a>>
#include <<a href="qbuttongroup-h.html">ntqbuttongroup.h</a>>
#include <<a href="qapplication-h.html">ntqapplication.h</a>>
#include <math.h>
//
// First we define the functionality our demo should present
// to the user. You might add different demo-modes if you wish so.
//
//
// This function draws a color wheel.
// The coordinate system x=(0..500), y=(0..500) spans the paint device.
//
void drawColorWheel( <a href="ntqpainter.html">TQPainter</a> *p )
{
<a href="ntqfont.html">TQFont</a> f( "times", 18, TQFont::Bold );
<a name="x1075"></a> p-><a href="ntqpainter.html#setFont">setFont</a>( f );
<a name="x1076"></a> p-><a href="ntqpainter.html#setPen">setPen</a>( TQt::black );
<a name="x1077"></a> p-><a href="ntqpainter.html#setWindow">setWindow</a>( 0, 0, 500, 500 ); // defines coordinate system
for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles
<a href="ntqwmatrix.html">TQWMatrix</a> matrix;
<a name="x1097"></a> matrix.<a href="ntqwmatrix.html#translate">translate</a>( 250.0F, 250.0F ); // move to center
<a name="x1096"></a> matrix.<a href="ntqwmatrix.html#shear">shear</a>( 0.0F, 0.3F ); // twist it
<a name="x1095"></a> matrix.<a href="ntqwmatrix.html#rotate">rotate</a>( (float)i*10 ); // rotate 0,10,20,.. degrees
<a name="x1078"></a> p-><a href="ntqpainter.html#setWorldMatrix">setWorldMatrix</a>( matrix ); // use this world matrix
<a href="ntqcolor.html">TQColor</a> c;
<a name="x1063"></a> c.<a href="ntqcolor.html#setHsv">setHsv</a>( i*10, 255, 255 ); // rainbow effect
<a name="x1074"></a> p-><a href="ntqpainter.html#setBrush">setBrush</a>( c ); // solid fill with color c
<a name="x1070"></a> p-><a href="ntqpainter.html#drawRect">drawRect</a>( 70, -10, 80, 10 ); // draw the rectangle
<a href="ntqstring.html">TQString</a> n;
n.<a href="ntqstring.html#sprintf">sprintf</a>( "H=%d", i*10 );
<a name="x1072"></a> p-><a href="ntqpainter.html#drawText">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="ntqpainter.html">TQPainter</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="ntqfont.html">TQFont</a> font( fonts[f], sizes[s] );
p-><a href="ntqpainter.html#setFont">setFont</a>( font );
<a name="x1073"></a> <a href="ntqfontmetrics.html">TQFontMetrics</a> fm = p-><a href="ntqpainter.html#fontMetrics">fontMetrics</a>();
<a name="x1064"></a> y += fm.<a href="ntqfontmetrics.html#ascent">ascent</a>();
p-><a href="ntqpainter.html#drawText">drawText</a>( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" );
<a name="x1065"></a> y += fm.<a href="ntqfontmetrics.html#descent">descent</a>();
s++;
}
f++;
}
}
//
// This function draws some shapes
//
void drawShapes( <a href="ntqpainter.html">TQPainter</a> *p )
{
<a href="ntqbrush.html">TQBrush</a> b1( TQt::blue );
<a href="ntqbrush.html">TQBrush</a> b2( TQt::green, TQt::Dense6Pattern ); // green 12% fill
<a href="ntqbrush.html">TQBrush</a> b3( TQt::NoBrush ); // void brush
<a href="ntqbrush.html">TQBrush</a> b4( TQt::CrossPattern ); // black cross pattern
p-><a href="ntqpainter.html#setPen">setPen</a>( TQt::red );
p-><a href="ntqpainter.html#setBrush">setBrush</a>( b1 );
p-><a href="ntqpainter.html#drawRect">drawRect</a>( 10, 10, 200, 100 );
p-><a href="ntqpainter.html#setBrush">setBrush</a>( b2 );
<a name="x1071"></a> p-><a href="ntqpainter.html#drawRoundRect">drawRoundRect</a>( 10, 150, 200, 100, 20, 20 );
p-><a href="ntqpainter.html#setBrush">setBrush</a>( b3 );
<a name="x1068"></a> p-><a href="ntqpainter.html#drawEllipse">drawEllipse</a>( 250, 10, 200, 100 );
p-><a href="ntqpainter.html#setBrush">setBrush</a>( b4 );
<a name="x1069"></a> p-><a href="ntqpainter.html#drawPie">drawPie</a>( 250, 150, 200, 100, 45*16, 90*16 );
}
typedef void (*draw_func)(TQPainter*);
struct DrawThing {
draw_func f;
const char *name;
};
//
// All previously implemented functions are collected
// in the following "table".
// If you implement different functionality, your new draw
// function must be assigned here with a function pointer and
// description.
// Leave the zeros at the end, they will be used
// as markers referring to the end of the array.
//
DrawThing ourDrawFunctions[] = {
// name of the function, title presented to the user
{ drawColorWheel, "Draw color wheel" },
{ drawFonts, "Draw fonts" },
{ drawShapes, "Draw shapes" },
{ 0, 0 } };
class DrawView : public <a href="ntqwidget.html">TQWidget</a>
{
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
public:
DrawView();
~DrawView();
public slots:
void updateIt( int );
void printIt();
protected:
void drawIt( <a href="ntqpainter.html">TQPainter</a> * );
void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * );
void resizeEvent( <a href="qresizeevent.html">TQResizeEvent</a> * );
private:
<a href="ntqprinter.html">TQPrinter</a> *printer;
<a href="ntqbuttongroup.html">TQButtonGroup</a> *bgroup;
<a href="ntqpushbutton.html">TQPushButton</a> *print;
int drawindex;
int maxindex;
};
//
// Construct the DrawView with buttons.
//
<a name="f367"></a>DrawView::DrawView()
{
<a href="ntqwidget.html#setCaption">setCaption</a>( "TQt Draw Demo Application" );
<a href="ntqwidget.html#setBackgroundMode">setBackgroundMode</a>(PaletteBase);
// Create a button group to contain all buttons
bgroup = new <a href="ntqbuttongroup.html">TQButtonGroup</a>( this );
<a name="x1088"></a> bgroup-><a href="ntqwidget.html#resize">resize</a>( 200, 200 );
<a name="x1062"></a> <a href="ntqobject.html#connect">connect</a>( bgroup, SIGNAL(<a href="ntqbuttongroup.html#clicked">clicked</a>(int)), SLOT(updateIt(int)) );
// Calculate the size for the radio buttons
int maxwidth = 80;
int maxheight = 10;
int i;
const char *n;
<a name="x1084"></a> <a href="ntqfontmetrics.html">TQFontMetrics</a> fm = bgroup-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>();
// Find out the longest function description.
// Here we make use of the last "0,0"-entry in the
// ourDrawFunctions-array.
for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
<a name="x1066"></a> int w = fm.<a href="ntqfontmetrics.html#width">width</a>( n );
maxwidth = TQMAX(w,maxwidth); // TQMAX is a macro defined in ntqglobal.h
// and returns the biggest of to values.
// Due to its macro nature one should use it with care and with
// constant parameters only.
}
maxwidth = maxwidth + 30; // allow 30 pixels for radiobuttons
for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
<a href="ntqradiobutton.html">TQRadioButton</a> *rb = new <a href="ntqradiobutton.html">TQRadioButton</a>( n, bgroup );
<a name="x1091"></a> rb-><a href="ntqwidget.html#setGeometry">setGeometry</a>( 10, i*30+10, maxwidth, 30 );
maxheight += 30;
if ( i == 0 )
<a name="x1082"></a> rb-><a href="ntqradiobutton.html#setChecked">setChecked</a>( TRUE );
}
maxheight += 10; // maxheight is now 10 pixels upper margin
// plus number_of_drawfunctions * 30
// plus 10 pixels lower margin
drawindex = 0; // draw first thing
maxindex = i;
maxwidth += 20; // add some margin, this results in the
// final width of bgroup
bgroup-><a href="ntqwidget.html#resize">resize</a>( maxwidth, maxheight ); // resize bgroup to its final size
// when no printersupport is provided
// If -- at compile time -- printer support will be disabled,
// we won't set up printing functionality.
#ifndef TQT_NO_PRINTER
printer = new <a href="ntqprinter.html">TQPrinter</a>;
// Create and setup the print button
print = new <a href="ntqpushbutton.html">TQPushButton</a>( "Print...", bgroup );
<a name="x1081"></a> print-><a href="ntqwidget.html#resize">resize</a>( 80, 30 );
<a name="x1093"></a><a name="x1080"></a> print-><a href="ntqwidget.html#move">move</a>( maxwidth/2 - print-><a href="ntqwidget.html#width">width</a>()/2, maxindex*30+20 );
<a href="ntqobject.html#connect">connect</a>( print, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), SLOT(printIt()) );
// Resize bgroup to its final size when printersupport is given.
<a name="x1094"></a><a name="x1085"></a> bgroup-><a href="ntqwidget.html#resize">resize</a>( maxwidth, print-><a href="ntqwidget.html#y">y</a>()+print-><a href="ntqwidget.html#height">height</a>()+10 );
#endif
<a href="ntqwidget.html#resize">resize</a>( 640,300 );
}
//
// Clean up.
//
DrawView::~DrawView()
{
#ifndef TQT_NO_PRINTER
delete printer;
#endif
}
//
// Called when a radio button is clicked.
//
void <a name="f368"></a>DrawView::updateIt( int index )
{
if ( index < maxindex ) {
drawindex = index;
<a href="ntqwidget.html#update">update</a>();
}
}
//
// Calls the drawing function as specified by the radio buttons.
//
void <a name="f369"></a>DrawView::drawIt( <a href="ntqpainter.html">TQPainter</a> *p )
{
(*ourDrawFunctions[drawindex].f)(p);
}
//
// Called when the print button is clicked.
//
void <a name="f370"></a>DrawView::printIt()
{
<a name="x1079"></a> if ( printer-><a href="ntqprinter.html#setup">setup</a>( this ) ) {
<a href="ntqpainter.html">TQPainter</a> paint;
<a name="x1067"></a> if( !paint.<a href="ntqpainter.html#begin">begin</a>( printer ) )
return;
drawIt( &paint );
}
}
//
// Called when the widget needs to be updated.
//
void DrawView::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * )
{
<a href="ntqpainter.html">TQPainter</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="ntqwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">TQResizeEvent</a> * )
{
<a name="x1086"></a> bgroup-><a href="ntqwidget.html#move">move</a>( <a href="ntqwidget.html#width">width</a>()-bgroup-><a href="ntqwidget.html#width">width</a>(), 0 );
}
//
// Create and display our widget.
//
#include "drawdemo.moc"
int main( int argc, char **argv )
{
<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
DrawView draw;
app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &draw );
draw.<a href="ntqwidget.html#setCaption">setCaption</a>("TQt Example - Drawdemo");
draw.<a href="ntqwidget.html#show">show</a>();
return app.<a href="ntqapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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