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Diffstat (limited to 'examples/desktop/desktop.cpp')
| -rw-r--r-- | examples/desktop/desktop.cpp | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/examples/desktop/desktop.cpp b/examples/desktop/desktop.cpp new file mode 100644 index 0000000..2b6fb30 --- /dev/null +++ b/examples/desktop/desktop.cpp @@ -0,0 +1,347 @@ +/**************************************************************************** +** +** Copyright (C) 1992-2008 Trolltech ASA. 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 <qimage.h> +#include <qbitmap.h> +#include <qpainter.h> +#include <qapplication.h> +#include <qdropsite.h> +#include <qdragobject.h> +#include <stdio.h> + + +static double seed = 0.353535353535; +static const int KINDA_RAND_MAX = 32767; + +static int kindaRand() +{ + seed = seed*147; + seed = seed - (double) ((int) seed); + return (int) ( seed*(KINDA_RAND_MAX + 1) ); +} + +static int velocity( int i ) // change velocity +{ + const int velmax = 15; + const int velmin = 4; + if ( i == 1 || i == 2 ) + i = (kindaRand()&0x7fff % velmax)/3 + velmin; + else + i = (kindaRand()&0x7fff % velmax) + velmin; + return i; +} + +// +// Draw polygon on desktop. +// + +void poly() +{ + QWidget *d = QApplication::desktop(); + d->setBackgroundColor( Qt::white ); // white desktop + + const int maxpoints = 5; + const int maxcurves = 8; + static int xvel[maxpoints]; + static int yvel[maxpoints]; + int head = 0; + int tail = -maxcurves + 2; + QPointArray *a = new QPointArray[ maxcurves ]; + register QPointArray *p; + QRect r = d->rect(); // desktop rectangle + + int i; + for ( i=0; i<maxcurves; i++ ) + a[i].resize( maxpoints ); + p = &a[0]; + for ( i=0; i<maxpoints; i++ ) { // setup first polygon points + p->setPoint( i, (kindaRand()&0x7fff) % r.width(), + (kindaRand()&0x7fff) % r.height() ); + xvel[i] = velocity(i); + yvel[i] = velocity(i); + } + + QPainter paint; + paint.begin( d ); // start painting desktop + + for ( int ntimes=0; ntimes<2000; ntimes++ ) { + paint.setBrush( QColor(kindaRand()%360, 180, 255, QColor::Hsv) ); + paint.drawPolygon( a[head] ); + if ( ++tail >= maxcurves ) + tail = 0; + + int minx=r.left(), maxx=r.right(); + int miny=r.top(), maxy=r.bottom(); + int x, y; + p = &a[head]; + if ( ++head >= maxcurves ) + head = 0; + for ( i=0; i<maxpoints; i++ ) { // calc new curve + p->point( i, &x, &y ); + x += xvel[i]; + y += yvel[i]; + if ( x >= maxx ) { + x = maxx - (x - maxx + 1); + xvel[i] = -velocity(i); + } + if ( x <= minx ) { + x = minx + (minx - x + 1); + xvel[i] = velocity(i); + } + if ( y >= maxy ) { + y = maxy - (y - maxy + 1); + yvel[i] = -velocity(i); + } + if ( y <= miny ) { + y = miny + (miny - y + 1); + yvel[i] = velocity(i); + } + a[head].setPoint( i, x, y ); + } + } + paint.end(); // painting done + delete[] a; +} + + +// +// Rotate pattern on desktop. +// + +void rotate() +{ + int i; + const int w = 64; + const int h = 64; + QImage image( w, h, 8, 128 ); // create image + for ( i=0; i<128; i++ ) // build color table + image.setColor( i, qRgb(i,0,0) ); + for ( int y=0; y<h; y++ ) { // set image pixels + uchar *p = image.scanLine(y); + for ( int x=0; x<w; x++ ) + *p++ = (x+y)%128; + } + + QPixmap pm; + pm = image; // convert image to pixmap + pm.setOptimization( QPixmap::BestOptim ); // rotation will be faster + + QWidget *d = QApplication::desktop(); // w = desktop widget + + for ( i=0; i<=360; i += 2 ) { + QWMatrix m; + m.rotate( i ); // rotate coordinate system + QPixmap rpm = pm.xForm( m ); // rpm = rotated pixmap + d->setBackgroundPixmap( rpm ); // set desktop pixmap + d->update(); // repaint desktop + } +} + +// +// Generates a marble-like pattern in pm. +// + +void generateStone( QPixmap *pm, + const QColor &c1, const QColor &c2, const QColor &c3 ) +{ + QPainter p; + QPen p1 ( c1, 0 ); + QPen p2 ( c2, 0 ); + QPen p3 ( c3, 0 ); + + p.begin( pm ); + for( int i = 0 ; i < pm->width() ; i++ ) + for( int j = 0 ; j < pm->height() ; j++ ) { + int r = kindaRand(); + if ( r < KINDA_RAND_MAX / 3 ) + p.setPen( p1 ); + else if ( r < KINDA_RAND_MAX / 3 * 2 ) + p.setPen( p2 ); + else + p.setPen( p3 ); + p.drawPoint( i,j ); + } + p.end(); +} + +void drawShadeText( QPainter *p, int x, int y, const char *text, + const QColor &topColor, const QColor &bottomColor, + int sw = 2 ) +{ + if ( !p->isActive() ) + return; + + p->setPen( bottomColor ); + p->drawText( x+sw, y+sw, text ); + p->setPen( topColor ); + p->drawText( x, y, text ); +} + +// NOTE: desktop drag/drop is experimental + +class DesktopWidget : public QWidget, private QDropSite +{ +public: + DesktopWidget( const char *s, QWidget *parent=0, const char *name=0 ); + ~DesktopWidget(); + void paintEvent( QPaintEvent * ); + + void dragEnterEvent( QDragEnterEvent *e ) + { + if ( QImageDrag::canDecode(e) ) + e->accept(); + } + + void dragLeaveEvent( QDragLeaveEvent * ) + { + } + + void dragMoveEvent( QDragMoveEvent *e ) + { + e->accept(); + } + + void dropEvent( QDropEvent * e ) + { + QPixmap pmp; + if ( QImageDrag::decode( e, pmp ) ) { + setBackgroundPixmap( pmp ); + update(); + } + } + +private: + QPixmap *pm; + QString text; +}; + +DesktopWidget::DesktopWidget( const char *s, QWidget *parent, const char *name ) + : QWidget( parent, name, WType_Desktop | WPaintDesktop), + QDropSite(this) +{ + text = s; + pm = 0; +} + +DesktopWidget::~DesktopWidget() +{ + delete pm; +} + +void DesktopWidget::paintEvent( QPaintEvent * ) +{ + QColor c1 = backgroundColor(); + QColor c2 = c1.light(104); + QColor c3 = c1.dark(106); + if ( !pm ) { + pm = new QPixmap( 64, 64 ); + generateStone( pm, c1, c2, c3 ); + setBackgroundPixmap( *pm ); + update(); + } + QRect br = fontMetrics().boundingRect( text ); + QPixmap offscreen( br.width(), br.height() ); + int x = width()/2 - br.width()/2; + int y = height()/2 - br.height()/2; + offscreen.fill( this, x, y ); + QPainter p; + p.begin( &offscreen ); + drawShadeText( &p, -br.x(), -br.y(), text, c2, c3, 3 ); + p.end(); + bitBlt( this, x, y, &offscreen ); +} + +void desktopWidget( const char *s = "Trolltech" ) +{ + DesktopWidget *t = new DesktopWidget(s); + t->update(); + qApp->exec(); + delete t; +} + +void desktopText( const char *s = "Trolltech" ) +{ + const int border = 20; + + QColor c1 = qApp->palette().inactive().background(); + QColor c2 = c1.light(104); + QColor c3 = c1.dark(106); + + QPixmap pm(10,10); + + QPainter p; + p.begin( &pm ); + QRect r = p.fontMetrics().boundingRect( s ); + p.end(); + + int appWidth = qApp->desktop()->width(); + int appHeight = qApp->desktop()->height(); + if ( r.width() > appWidth - border*2 ) + r.setWidth( appWidth - border*2 ); + if ( r.height() > appHeight - border*2 ) + r.setHeight( appHeight - border*2 ); + + pm.resize( r.size() + QSize( border*2, border*2 ) ); + generateStone( &pm, c1, c2, c3 ); + p.begin( &pm ); + drawShadeText( &p, -r.x() + border, -r.y() + border, s, c2, c3 ); + p.end(); + + qApp->desktop()->setBackgroundPixmap( pm ); +} + +// +// The program starts here. +// + +int main( int argc, char **argv ) +{ + QApplication app( argc, argv ); + + if ( argc > 1 ) { + QFont f( "charter", 96, QFont::Black ); + f.setStyleHint( QFont::Times ); + app.setFont( f ); + } + + bool validOptions = FALSE; + + if ( argc == 2 ) { + validOptions = TRUE; + if ( strcmp(argv[1],"-poly") == 0 ) + poly(); + else if ( strcmp(argv[1],"-rotate") == 0 ) + rotate(); + else if ( strcmp(argv[1],"-troll") == 0 ) + desktopText(); + else if ( strcmp(argv[1],"-trollwidget") == 0 ) + desktopWidget(); + else + validOptions = FALSE; + } + if ( argc == 3 ) { + validOptions = TRUE; + if ( strcmp(argv[1],"-shadetext") == 0 ) + desktopText( argv[2] ); + else if ( strcmp(argv[1],"-shadewidget") == 0 ) + desktopWidget( argv[2] ); + else + validOptions = FALSE; + } + if ( !validOptions ) { + fprintf( stderr, "Usage:\n\tdesktop -poly" + "\n\tdesktop -rotate" + "\n\tdesktop -troll" + "\n\tdesktop -trollwidget" + "\n\tdesktop -shadetext <text>" + "\n\tdesktop -shadewidget <text>\n" ); + rotate(); + } + return 0; +} |