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+/****************************************************************************
+** $Id$
+**
+** 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 <qwidget.h>
+#include <qpainter.h>
+#include <kprinter.h>
+#include <qpushbutton.h>
+#include <qradiobutton.h>
+#include <qbuttongroup.h>
+#include <kapplication.h>
+#include <qapplication.h>
+#include <math.h>
+
+
+//
+// This function draws a color wheel.
+// The coordinate system x=(0..500), y=(0..500) spans the paint device.
+//
+
+void drawColorWheel( QPainter *p )
+{
+ QFont f( "times", 18, QFont::Bold );
+ p->setFont( f );
+ p->setPen( Qt::black );
+ p->setWindow( 0, 0, 500, 500 ); // defines coordinate system
+
+ for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles
+
+ QWMatrix matrix;
+ matrix.translate( 250.0F, 250.0F ); // move to center
+ matrix.shear( 0.0F, 0.3F ); // twist it
+ matrix.rotate( (float)i*10 ); // rotate 0,10,20,.. degrees
+ p->setWorldMatrix( matrix ); // use this world matrix
+
+ QColor c;
+ c.setHsv( i*10, 255, 255 ); // rainbow effect
+ p->setBrush( c ); // solid fill with color c
+ p->drawRect( 70, -10, 80, 10 ); // draw the rectangle
+
+ QString n;
+ n.sprintf( "H=%d", i*10 );
+ p->drawText( 80+70+5, 0, n ); // draw the hue number
+ }
+}
+
+
+//
+// This function draws a few lines of text using different fonts.
+//
+
+void drawFonts( QPainter *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] ) {
+ QFont font( fonts[f], sizes[s] );
+ p->setFont( font );
+ QFontMetrics fm = p->fontMetrics();
+ y += fm.ascent();
+ p->drawText( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" );
+ y += fm.descent();
+ s++;
+ }
+ f++;
+ }
+}
+
+
+//
+// This function draws some shapes
+//
+
+void drawShapes( QPainter *p )
+{
+ QBrush b1( Qt::blue );
+ QBrush b2( Qt::green, Qt::Dense6Pattern ); // green 12% fill
+ QBrush b3( Qt::NoBrush ); // void brush
+ QBrush b4( Qt::CrossPattern ); // black cross pattern
+
+ p->setPen( Qt::red );
+ p->setBrush( b1 );
+ p->drawRect( 10, 10, 200, 100 );
+ p->setBrush( b2 );
+ p->drawRoundRect( 10, 150, 200, 100, 20, 20 );
+ p->setBrush( b3 );
+ p->drawEllipse( 250, 10, 200, 100 );
+ p->setBrush( b4 );
+ p->drawPie( 250, 150, 200, 100, 45*16, 90*16 );
+}
+
+
+typedef void (*draw_func)(QPainter*);
+
+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 } };
+
+
+#include "drawdemo.h"
+
+//
+// Construct the DrawView with buttons.
+//
+
+DrawView::DrawView()
+{
+ setCaption( "Qt Draw Demo Application" );
+ setBackgroundColor( white );
+
+ // Create a button group to contain all buttons
+ bgroup = new QButtonGroup( this );
+ bgroup->resize( 200, 200 );
+ connect( bgroup, SIGNAL(clicked(int)), SLOT(updateIt(int)) );
+
+ // Calculate the size for the radio buttons
+ int maxwidth = 80;
+ int i;
+ const char *n;
+ QFontMetrics fm = bgroup->fontMetrics();
+ for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
+ int w = fm.width( n );
+ maxwidth = QMAX(w,maxwidth);
+ }
+ maxwidth = maxwidth + 20; // add 20 pixels
+
+ for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) {
+ QRadioButton *rb = new QRadioButton( n, bgroup );
+ rb->setGeometry( 10, i*30+10, maxwidth, 30 );
+ if ( i == 0 )
+ rb->setChecked( true );
+ }
+
+ drawindex = 0; // draw first thing
+ maxindex = i;
+
+ maxwidth += 40; // now size of bgroup
+
+ printer = new KPrinter;
+
+ // Create and setup the print button
+ print = new QPushButton( "Print...", bgroup );
+ print->resize( 80, 30 );
+ print->move( maxwidth/2 - print->width()/2, maxindex*30+20 );
+ connect( print, SIGNAL(clicked()), SLOT(printIt()) );
+
+ bgroup->resize( maxwidth, print->y()+print->height()+10 );
+
+ resize( 640,300 );
+}
+
+//
+// Clean up
+//
+DrawView::~DrawView()
+{
+#ifndef QT_NO_PRINTER
+ delete printer;
+#endif
+}
+
+//
+// Called when a radio button is clicked.
+//
+
+void DrawView::updateIt( int index )
+{
+ if ( index < maxindex ) {
+ drawindex = index;
+ update();
+ }
+}
+
+//
+// Calls the drawing function as specified by the radio buttons.
+//
+
+void DrawView::drawIt( QPainter *p )
+{
+ (*ourDrawFunctions[drawindex].f)(p);
+}
+
+//
+// Called when the print button is clicked.
+//
+
+void DrawView::printIt()
+{
+#ifndef QT_NO_PRINTER
+ if ( printer->setup( this ) ) {
+ QPainter paint( printer );
+ drawIt( &paint );
+ }
+#endif
+}
+
+//
+// Called when the widget needs to be updated.
+//
+
+void DrawView::paintEvent( QPaintEvent * )
+{
+ QPainter paint( this );
+ drawIt( &paint );
+}
+
+//
+// Called when the widget has been resized.
+// Moves the button group to the upper right corner
+// of the widget.
+
+void DrawView::resizeEvent( QResizeEvent * )
+{
+ bgroup->move( width()-bgroup->width(), 0 );
+}
+
+
+//
+// Create and display our widget.
+//
+
+#include "drawdemo.moc"
+
+int main( int argc, char **argv )
+{
+ KApplication app( argc, argv, "drawdemo" );
+ DrawView draw;
+ app.setMainWidget( &draw );
+ draw.show();
+ return app.exec();
+}