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313 lines
7.4 KiB
313 lines
7.4 KiB
/****************************************************************************
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**
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** Copyright (C) 1992-2008 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 <qwidget.h>
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#include <qpainter.h>
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#include <qprinter.h>
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#include <qpushbutton.h>
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#include <qradiobutton.h>
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#include <qbuttongroup.h>
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#include <qapplication.h>
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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( QPainter *p )
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{
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QFont f( "times", 18, QFont::Bold );
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p->setFont( f );
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p->setPen( Qt::black );
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p->setWindow( 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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QWMatrix matrix;
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matrix.translate( 250.0F, 250.0F ); // move to center
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matrix.shear( 0.0F, 0.3F ); // twist it
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matrix.rotate( (float)i*10 ); // rotate 0,10,20,.. degrees
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p->setWorldMatrix( matrix ); // use this world matrix
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QColor c;
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c.setHsv( i*10, 255, 255 ); // rainbow effect
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p->setBrush( c ); // solid fill with color c
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p->drawRect( 70, -10, 80, 10 ); // draw the rectangle
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QString n;
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n.sprintf( "H=%d", i*10 );
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p->drawText( 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( QPainter *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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QFont font( fonts[f], sizes[s] );
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p->setFont( font );
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QFontMetrics fm = p->fontMetrics();
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y += fm.ascent();
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p->drawText( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" );
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y += fm.descent();
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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( QPainter *p )
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{
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QBrush b1( Qt::blue );
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QBrush b2( Qt::green, Qt::Dense6Pattern ); // green 12% fill
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QBrush b3( Qt::NoBrush ); // void brush
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QBrush b4( Qt::CrossPattern ); // black cross pattern
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p->setPen( Qt::red );
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p->setBrush( b1 );
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p->drawRect( 10, 10, 200, 100 );
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p->setBrush( b2 );
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p->drawRoundRect( 10, 150, 200, 100, 20, 20 );
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p->setBrush( b3 );
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p->drawEllipse( 250, 10, 200, 100 );
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p->setBrush( b4 );
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p->drawPie( 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 QWidget
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{
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Q_OBJECT
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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( QPainter * );
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void paintEvent( QPaintEvent * );
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void resizeEvent( QResizeEvent * );
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private:
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QPrinter *printer;
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QButtonGroup *bgroup;
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QPushButton *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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DrawView::DrawView()
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{
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setCaption( "Qt Draw Demo Application" );
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setBackgroundMode(PaletteBase);
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// Create a button group to contain all buttons
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bgroup = new QButtonGroup( this );
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bgroup->resize( 200, 200 );
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connect( bgroup, SIGNAL(clicked(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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QFontMetrics fm = bgroup->fontMetrics();
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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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int w = fm.width( 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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QRadioButton *rb = new QRadioButton( n, bgroup );
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rb->setGeometry( 10, i*30+10, maxwidth, 30 );
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maxheight += 30;
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if ( i == 0 )
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rb->setChecked( 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->resize( 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 QPrinter;
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// Create and setup the print button
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print = new QPushButton( "Print...", bgroup );
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print->resize( 80, 30 );
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print->move( maxwidth/2 - print->width()/2, maxindex*30+20 );
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connect( print, SIGNAL(clicked()), SLOT(printIt()) );
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// Resize bgroup to its final size when printersupport is given.
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bgroup->resize( maxwidth, print->y()+print->height()+10 );
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#endif
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resize( 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 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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update();
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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 DrawView::drawIt( QPainter *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 DrawView::printIt()
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{
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if ( printer->setup( this ) ) {
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QPainter paint;
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if( !paint.begin( 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::paintEvent( QPaintEvent * )
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{
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QPainter paint( this );
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drawIt( &paint );
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}
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//
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// Called when the widget has been resized.
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// Moves the button group to the upper right corner
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// of the widget.
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void DrawView::resizeEvent( QResizeEvent * )
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{
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bgroup->move( width()-bgroup->width(), 0 );
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}
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//
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// Create and display our widget.
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//
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#include "drawdemo.moc"
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int main( int argc, char **argv )
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{
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QApplication app( argc, argv );
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DrawView draw;
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app.setMainWidget( &draw );
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draw.setCaption("Qt Example - Drawdemo");
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draw.show();
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return app.exec();
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}
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