/**************************************************************************** ** ** 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include class ModeNames { public: enum Mode { Text, Image, Picture }; }; class XFormControl : public QVBox, public ModeNames { Q_OBJECT public: XFormControl( const QFont &initialFont, QWidget *parent=0, const char *name=0 ); ~XFormControl() {} QWMatrix matrix(); signals: void newMatrix( QWMatrix ); void newText( const QString& ); void newFont( const QFont & ); void newMode( int ); private slots: void newMtx(); void newTxt(const QString&); void selectFont(); void fontSelected( const QFont & ); void changeMode(int); void timerEvent(QTimerEvent*); private: Mode mode; QSlider *rotS; // Rotation angle scroll bar QSlider *shearS; // Shear value scroll bar QSlider *magS; // Magnification value scroll bar QLCDNumber *rotLCD; // Rotation angle LCD display QLCDNumber *shearLCD; // Shear value LCD display QLCDNumber *magLCD; // Magnification value LCD display QCheckBox *mirror; // Checkbox for mirror image on/of QWidgetStack* optionals; QLineEdit *textEd; // Inp[ut field for xForm text QPushButton *fpb; // Select font push button QRadioButton *rb_txt; // Radio button for text QRadioButton *rb_img; // Radio button for image QRadioButton *rb_pic; // Radio button for picture QFont currentFont; }; /* ShowXForm displays a text or a pixmap (QPixmap) using a coordinate transformation matrix (QWMatrix) */ class ShowXForm : public QWidget, public ModeNames { Q_OBJECT public: ShowXForm( const QFont &f, QWidget *parent=0, const char *name=0 ); ~ShowXForm() {} void showIt(); // (Re)displays text or pixmap Mode mode() const { return m; } public slots: void setText( const QString& ); void setMatrix( QWMatrix ); void setFont( const QFont &f ); void setPixmap( QPixmap ); void setPicture( const QPicture& ); void setMode( int ); private: QSizePolicy sizePolicy() const; QSize sizeHint() const; void paintEvent( QPaintEvent * ); void resizeEvent( QResizeEvent * ); QWMatrix mtx; // coordinate transform matrix QString text; // text to be displayed QPixmap pix; // pixmap to be displayed QPicture picture; // text to be displayed QRect eraseRect; // covers last displayed text/pixmap Mode m; }; XFormControl::XFormControl( const QFont &initialFont, QWidget *parent, const char *name ) : QVBox( parent, name ) { setSpacing(6); setMargin(6); currentFont = initialFont; mode = Image; rotLCD = new QLCDNumber( 4, this, "rotateLCD" ); rotS = new QSlider( QSlider::Horizontal, this, "rotateSlider" ); shearLCD = new QLCDNumber( 5,this, "shearLCD" ); shearS = new QSlider( QSlider::Horizontal, this, "shearSlider" ); mirror = new QCheckBox( this, "mirrorCheckBox" ); rb_txt = new QRadioButton( this, "text" ); rb_img = new QRadioButton( this, "image" ); rb_pic = new QRadioButton( this, "picture" ); optionals = new QWidgetStack(this); QVBox* optionals_text = new QVBox(optionals); optionals_text->setSpacing(6); QVBox* optionals_other = new QVBox(optionals); optionals_other->setSpacing(6); optionals->addWidget(optionals_text,0); optionals->addWidget(optionals_other,1); fpb = new QPushButton( optionals_text, "text" ); textEd = new QLineEdit( optionals_text, "text" ); textEd->setFocus(); rotLCD->display( " 0'" ); rotS->setRange( -180, 180 ); rotS->setValue( 0 ); connect( rotS, SIGNAL(valueChanged(int)), SLOT(newMtx()) ); shearLCD->display( "0.00" ); shearS->setRange( -25, 25 ); shearS->setValue( 0 ); connect( shearS, SIGNAL(valueChanged(int)), SLOT(newMtx()) ); mirror->setText( tr("Mirror") ); connect( mirror, SIGNAL(clicked()), SLOT(newMtx()) ); QButtonGroup *bg = new QButtonGroup(this); bg->hide(); bg->insert(rb_txt,0); bg->insert(rb_img,1); bg->insert(rb_pic,2); rb_txt->setText( tr("Text") ); rb_img->setText( tr("Image") ); rb_img->setChecked(TRUE); rb_pic->setText( tr("Picture") ); connect( bg, SIGNAL(clicked(int)), SLOT(changeMode(int)) ); fpb->setText( tr("Select font...") ); connect( fpb, SIGNAL(clicked()), SLOT(selectFont()) ); textEd->setText( "Troll" ); connect( textEd, SIGNAL(textChanged(const QString&)), SLOT(newTxt(const QString&)) ); magLCD = new QLCDNumber( 4,optionals_other, "magLCD" ); magLCD->display( "100" ); magS = new QSlider( QSlider::Horizontal, optionals_other, "magnifySlider" ); magS->setRange( 0, 800 ); connect( magS, SIGNAL(valueChanged(int)), SLOT(newMtx()) ); magS->setValue( 0 ); connect( magS, SIGNAL(valueChanged(int)), magLCD, SLOT(display(int))); optionals_text->adjustSize(); optionals_other->adjustSize(); changeMode(Image); startTimer(20); // start an initial animation } void XFormControl::timerEvent(QTimerEvent*) { int v = magS->value(); v = (v+2)+v/10; if ( v >= 200 ) { v = 200; killTimers(); } magS->setValue(v); } /* Called whenever the user has changed one of the matrix parameters (i.e. rotate, shear or magnification) */ void XFormControl::newMtx() { emit newMatrix( matrix() ); } void XFormControl::newTxt(const QString& s) { emit newText(s); changeMode(Text); } /* Calculates the matrix appropriate for the current controls, and updates the displays. */ QWMatrix XFormControl::matrix() { QWMatrix m; if (mode != Text) { double magVal = 1.0*magS->value()/100; m.scale( magVal, magVal ); } double shearVal = 1.0*shearS->value()/25; m.shear( shearVal, shearVal ); m.rotate( rotS->value() ); if ( mirror->isChecked() ) { m.scale( 1, -1 ); m.rotate( 180 ); } QString tmp; tmp.sprintf( "%1.2f", shearVal ); if ( shearVal >= 0 ) tmp.insert( 0, " " ); shearLCD->display( tmp ); int rot = rotS->value(); if ( rot < 0 ) rot = rot + 360; tmp.sprintf( "%3i'", rot ); rotLCD->display( tmp ); return m; } void XFormControl::selectFont() { bool ok; QFont f = QFontDialog::getFont( &ok, currentFont ); if ( ok ) { currentFont = f; fontSelected( f ); } } void XFormControl::fontSelected( const QFont &font ) { emit newFont( font ); changeMode(Text); } /* Sets the mode - Text, Image, or Picture. */ void XFormControl::changeMode(int m) { mode = (Mode)m; emit newMode( m ); newMtx(); if ( mode == Text ) { optionals->raiseWidget(0); rb_txt->setChecked(TRUE); } else { optionals->raiseWidget(1); if ( mode == Image ) rb_img->setChecked(TRUE); else rb_pic->setChecked(TRUE); } qApp->flushX(); } ShowXForm::ShowXForm( const QFont &initialFont, QWidget *parent, const char *name ) : QWidget( parent, name, WResizeNoErase ) { setFont( initialFont ); setBackgroundColor( white ); m = Text; eraseRect = QRect( 0, 0, 0, 0 ); } QSizePolicy ShowXForm::sizePolicy() const { return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ); } QSize ShowXForm::sizeHint() const { return QSize(400,400); } void ShowXForm::paintEvent( QPaintEvent * ) { showIt(); } void ShowXForm::resizeEvent( QResizeEvent * ) { eraseRect = QRect( width()/2, height()/2, 0, 0 ); repaint(rect()); } void ShowXForm::setText( const QString& s ) { text = s; showIt(); } void ShowXForm::setMatrix( QWMatrix w ) { mtx = w; showIt(); } void ShowXForm::setFont( const QFont &f ) { m = Text; QWidget::setFont( f ); } void ShowXForm::setPixmap( QPixmap pm ) { pix = pm; m = Image; showIt(); } void ShowXForm::setPicture( const QPicture& p ) { picture = p; m = Picture; showIt(); } void ShowXForm::setMode( int mode ) { m = (Mode)mode; } void ShowXForm::showIt() { QPainter p; QRect r; // rectangle covering new text/pixmap in virtual coordinates QWMatrix um; // copy user specified transform int textYPos = 0; // distance from boundingRect y pos to baseline int textXPos = 0; // distance from boundingRect x pos to text start QRect br; QFontMetrics fm( fontMetrics() ); // get widget font metrics switch ( mode() ) { case Text: br = fm.boundingRect( text ); // rectangle covering text r = br; textYPos = -r.y(); textXPos = -r.x(); br.moveTopLeft( QPoint( -br.width()/2, -br.height()/2 ) ); break; case Image: r = QRect(0, 0, pix.width()+1, pix.height()+1); break; case Picture: // ### need QPicture::boundingRect() r = QRect(0,0,1000,1000); break; } r.moveTopLeft( QPoint(-r.width()/2, -r.height()/2) ); r.moveBy( -1, -1 ); // add border for matrix round off r.setSize( QSize( r.width() + 2,r.height() + 2 ) ); // compute union of new and old rect // the resulting rectangle will cover what is already displayed // and have room for the new text/pixmap eraseRect = eraseRect.unite( mtx.mapRect(r) ); int pw = QMIN(eraseRect.width(),width()); int ph = QMIN(eraseRect.height(),height()); QPixmap pm( pw, ph ); // off-screen drawing pixmap pm.fill( backgroundColor() ); p.begin( &pm ); um.translate( pw/2, ph/2 ); // 0,0 is center um = mtx * um; p.setWorldMatrix( um ); switch ( mode() ) { case Text: p.setFont( font() ); // use widget font p.drawText( r.left() + textXPos, r.top() + textYPos, text ); #if 0 p.setPen( red ); p.drawRect( br ); #endif break; case Image: p.drawPixmap( -pix.width()/2, -pix.height()/2, pix ); break; case Picture: // ### need QPicture::boundingRect() p.scale(0.25,0.25); p.translate(-230,-180); p.drawPicture( picture ); } p.end(); int xpos = width()/2 - pw/2; int ypos = height()/2 - ph/2; bitBlt( this, xpos, ypos, // copy pixmap to widget &pm, 0, 0, -1, -1 ); eraseRect = mtx.map( r ); } /* Grand unifying widget, putting ShowXForm and XFormControl together. */ class XFormCenter : public QHBox, public ModeNames { Q_OBJECT public: XFormCenter( QWidget *parent=0, const char *name=0 ); public slots: void setFont( const QFont &f ) { sx->setFont( f ); } void newMode( int ); private: ShowXForm *sx; XFormControl *xc; }; void XFormCenter::newMode( int m ) { static bool first_i = TRUE; static bool first_p = TRUE; if ( sx->mode() == m ) return; if ( m == Image && first_i ) { first_i = FALSE; QPixmap pm; if ( pm.load( "image.any" ) ) sx->setPixmap( pm ); return; } if ( m == Picture && first_p ) { first_p = FALSE; QPicture p; if (p.load( "picture.any" )) sx->setPicture( p ); return; } sx->setMode(m); } XFormCenter::XFormCenter( QWidget *parent, const char *name ) : QHBox( parent, name ) { QFont f( "Charter", 36, QFont::Bold ); xc = new XFormControl( f, this ); sx = new ShowXForm( f, this ); setStretchFactor(sx,1); xc->setFrameStyle( QFrame::Panel | QFrame::Raised ); xc->setLineWidth( 2 ); connect( xc, SIGNAL(newText(const QString&)), sx, SLOT(setText(const QString&)) ); connect( xc, SIGNAL(newMatrix(QWMatrix)), sx, SLOT(setMatrix(QWMatrix)) ); connect( xc, SIGNAL(newFont(const QFont&)), sx, SLOT(setFont(const QFont&)) ); connect( xc, SIGNAL(newMode(int)), SLOT(newMode(int)) ); sx->setText( "Troll" ); newMode( Image ); sx->setMatrix(xc->matrix()); } int main( int argc, char **argv ) { QApplication a( argc, argv ); XFormCenter *xfc = new XFormCenter; a.setMainWidget( xfc ); xfc->setCaption("Qt Example - XForm"); xfc->show(); return a.exec(); } #include "xform.moc" // include metadata generated by the moc