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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - xform/xform.cpp example file</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: white; color: black; }--></style></head><body bgcolor="#ffffff"><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><h1 align=center>Transformed Graphics Demo</h1><br clear="all"> This example lets the user rotate, shear and scale text and graphics arbitrarily. <hr> Implementation:<pre>/****************************************************************************** $Id: qt/examples/xform/xform.cpp 2.3.8 edited 2004-05-12 $**** 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 <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>#include <<a name="qdialog.h"></a><a href="qdialog-h.html">qdialog.h</a>>#include <<a name="qlabel.h"></a><a href="qlabel-h.html">qlabel.h</a>>#include <<a name="qlineedit.h"></a><a href="qlineedit-h.html">qlineedit.h</a>>#include <<a name="qpushbutton.h"></a><a href="qpushbutton-h.html">qpushbutton.h</a>>#include <<a name="qcheckbox.h"></a><a href="qcheckbox-h.html">qcheckbox.h</a>>#include <<a name="qradiobutton.h"></a><a href="qradiobutton-h.html">qradiobutton.h</a>>#include <<a name="qbuttongroup.h"></a><a href="qbuttongroup-h.html">qbuttongroup.h</a>>#include <<a name="qlcdnumber.h"></a><a href="qlcdnumber-h.html">qlcdnumber.h</a>>#include <<a name="qslider.h"></a><a href="qslider-h.html">qslider.h</a>>#include <<a name="qmenubar.h"></a><a href="qmenubar-h.html">qmenubar.h</a>>#include <<a name="qfontdialog.h"></a><a href="qfontdialog-h.html">qfontdialog.h</a>>#include <<a name="qlayout.h"></a><a href="qlayout-h.html">qlayout.h</a>>#include <<a name="qvbox.h"></a><a href="qvbox-h.html">qvbox.h</a>>#include <<a name="qwidgetstack.h"></a><a href="qwidgetstack-h.html">qwidgetstack.h</a>>#include <<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>>#include <<a name="qpixmap.h"></a><a href="qpixmap-h.html">qpixmap.h</a>>#include <<a name="qpicture.h"></a><a href="qpicture-h.html">qpicture.h</a>>#include <stdlib.h>class ModeNames {public: enum Mode { Text, Image, Picture };};class XFormControl : public QVBox, public ModeNames{ Q_OBJECTpublic: XFormControl( const QFont &initialFont, QWidget *parent=0, const char *name=0 ); ~XFormControl() {} <a name="QWMatrix"></a><a href="qwmatrix.html">QWMatrix</a> matrix();signals: void newMatrix( <a href="qwmatrix.html">QWMatrix</a> ); 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(<a name="QTimerEvent"></a><a href="qtimerevent.html">QTimerEvent</a>*);private: Mode mode; <a name="QSlider"></a><a href="qslider.html">QSlider</a> *rotS; // Rotation angle scroll bar <a href="qslider.html">QSlider</a> *shearS; // Shear value scroll bar <a href="qslider.html">QSlider</a> *magS; // Magnification value scroll bar <a name="QLCDNumber"></a><a href="qlcdnumber.html">QLCDNumber</a> *rotLCD; // Rotation angle LCD display <a href="qlcdnumber.html">QLCDNumber</a> *shearLCD; // Shear value LCD display <a href="qlcdnumber.html">QLCDNumber</a> *magLCD; // Magnification value LCD display <a name="QCheckBox"></a><a href="qcheckbox.html">QCheckBox</a> *mirror; // Checkbox for mirror image on/of <a name="QWidgetStack"></a><a href="qwidgetstack.html">QWidgetStack</a>* optionals; <a name="QLineEdit"></a><a href="qlineedit.html">QLineEdit</a> *textEd; // Inp[ut field for xForm text <a name="QPushButton"></a><a href="qpushbutton.html">QPushButton</a> *fpb; // Select font push button <a name="QRadioButton"></a><a href="qradiobutton.html">QRadioButton</a> *rb_txt; // Radio button for text <a href="qradiobutton.html">QRadioButton</a> *rb_img; // Radio button for image <a href="qradiobutton.html">QRadioButton</a> *rb_pic; // Radio button for picture <a name="QFont"></a><a href="qfont.html">QFont</a> currentFont;};/* ShowXForm displays a text or a pixmap (<a name="QPixmap"></a><a href="qpixmap.html">QPixmap</a>) using a coordinate transformation matrix (<a href="qwmatrix.html">QWMatrix</a>)*/class ShowXForm : public QWidget, public ModeNames{ Q_OBJECTpublic: 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( <a href="qwmatrix.html">QWMatrix</a> ); void setFont( const QFont &f ); void setPixmap( <a href="qpixmap.html">QPixmap</a> ); void setPicture( const QPicture& ); void setMode( int );private: <a name="QSizePolicy"></a><a href="qsizepolicy.html">QSizePolicy</a> sizePolicy() const; <a name="QSize"></a><a href="qsize.html">QSize</a> sizeHint() const; void paintEvent( <a name="QPaintEvent"></a><a href="qpaintevent.html">QPaintEvent</a> * ); void resizeEvent( <a name="QResizeEvent"></a><a href="qresizeevent.html">QResizeEvent</a> * ); <a href="qwmatrix.html">QWMatrix</a> mtx; // coordinate transform matrix <a name="QString"></a><a href="qstring.html">QString</a> text; // text to be displayed <a href="qpixmap.html">QPixmap</a> pix; // pixmap to be displayed <a name="QPicture"></a><a href="qpicture.html">QPicture</a> picture; // text to be displayed <a name="QRect"></a><a href="qrect.html">QRect</a> eraseRect; // covers last displayed text/pixmap Mode m;};XFormControl::XFormControl( const QFont &initialFont, <a name="QWidget"></a><a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a name="QVBox"></a><a href="qvbox.html">QVBox</a>( parent, name ){ setSpacing(6); setMargin(6); currentFont = initialFont; mode = Image; rotLCD = new <a href="qlcdnumber.html">QLCDNumber</a>( 4, this, "rotateLCD" ); rotS = new <a href="qslider.html">QSlider</a>( QSlider::Horizontal, this, "rotateSlider" ); shearLCD = new <a href="qlcdnumber.html">QLCDNumber</a>( 5,this, "shearLCD" ); shearS = new <a href="qslider.html">QSlider</a>( QSlider::Horizontal, this, "shearSlider" ); mirror = new <a href="qcheckbox.html">QCheckBox</a>( this, "mirrorCheckBox" ); rb_txt = new <a href="qradiobutton.html">QRadioButton</a>( this, "text" ); rb_img = new <a href="qradiobutton.html">QRadioButton</a>( this, "image" ); rb_pic = new <a href="qradiobutton.html">QRadioButton</a>( this, "picture" ); optionals = new <a href="qwidgetstack.html">QWidgetStack</a>(this); <a href="qvbox.html">QVBox</a>* optionals_text = new <a href="qvbox.html">QVBox</a>(optionals); optionals_text-><a name="setSpacing"></a><a href="qhbox.html#0075a0">setSpacing</a>(6); <a href="qvbox.html">QVBox</a>* optionals_other = new <a href="qvbox.html">QVBox</a>(optionals); optionals_other-><a href="qhbox.html#0075a0">setSpacing</a>(6); optionals-><a name="addWidget"></a><a href="qwidgetstack.html#562b2f">addWidget</a>(optionals_text,0); optionals-><a href="qwidgetstack.html#562b2f">addWidget</a>(optionals_other,1); fpb = new <a href="qpushbutton.html">QPushButton</a>( optionals_text, "text" ); textEd = new <a href="qlineedit.html">QLineEdit</a>( optionals_text, "text" ); textEd-><a name="setFocus"></a><a href="qwidget.html#25775a">setFocus</a>(); rotLCD-><a name="display"></a><a href="qlcdnumber.html#ecdf88">display</a>( " 0'" ); rotS-><a name="setRange"></a><a href="qrangecontrol.html#f2409c">setRange</a>( -180, 180 ); rotS-><a name="setValue"></a><a href="qslider.html#a03234">setValue</a>( 0 ); connect( rotS, SIGNAL(valueChanged(int)), SLOT(newMtx()) ); shearLCD-><a href="qlcdnumber.html#ecdf88">display</a>( "0.00" ); shearS-><a href="qrangecontrol.html#f2409c">setRange</a>( -25, 25 ); shearS-><a href="qslider.html#a03234">setValue</a>( 0 ); connect( shearS, SIGNAL(valueChanged(int)), SLOT(newMtx()) ); mirror-><a name="setText"></a><a href="qbutton.html#989f4f">setText</a>( tr("Mirror") ); connect( mirror, SIGNAL(clicked()), SLOT(newMtx()) ); <a name="QButtonGroup"></a><a href="qbuttongroup.html">QButtonGroup</a> *bg = new <a href="qbuttongroup.html">QButtonGroup</a>(this); bg-><a name="hide"></a><a href="qwidget.html#410481">hide</a>(); bg-><a name="insert"></a><a href="qbuttongroup.html#10bf2d">insert</a>(rb_txt,0); bg-><a href="qbuttongroup.html#10bf2d">insert</a>(rb_img,1); bg-><a href="qbuttongroup.html#10bf2d">insert</a>(rb_pic,2); rb_txt-><a href="qbutton.html#989f4f">setText</a>( tr("Text") ); rb_img-><a href="qbutton.html#989f4f">setText</a>( tr("Image") ); rb_img-><a name="setChecked"></a><a href="qradiobutton.html#0e50fc">setChecked</a>(TRUE); rb_pic-><a href="qbutton.html#989f4f">setText</a>( tr("Picture") ); connect( bg, SIGNAL(clicked(int)), SLOT(changeMode(int)) ); fpb-><a href="qbutton.html#989f4f">setText</a>( tr("Select font...") ); connect( fpb, SIGNAL(clicked()), SLOT(selectFont()) ); textEd-><a name="setText"></a><a href="qlineedit.html#1ff546">setText</a>( "Troll" ); connect( textEd, SIGNAL(textChanged(const QString&)), SLOT(newTxt(const QString&)) ); magLCD = new <a href="qlcdnumber.html">QLCDNumber</a>( 4,optionals_other, "magLCD" ); magLCD-><a href="qlcdnumber.html#ecdf88">display</a>( "100" ); magS = new <a href="qslider.html">QSlider</a>( QSlider::Horizontal, optionals_other, "magnifySlider" ); magS-><a href="qrangecontrol.html#f2409c">setRange</a>( 0, 800 ); connect( magS, SIGNAL(valueChanged(int)), SLOT(newMtx()) ); magS-><a href="qslider.html#a03234">setValue</a>( 0 ); connect( magS, SIGNAL(valueChanged(int)), magLCD, SLOT(display(int))); optionals_text-><a name="adjustSize"></a><a href="qwidget.html#2ec710">adjustSize</a>(); optionals_other-><a href="qwidget.html#2ec710">adjustSize</a>(); changeMode(Image); startTimer(20); // start an initial animation}void <a name="362"></a>XFormControl::timerEvent(<a href="qtimerevent.html">QTimerEvent</a>*){ int v = magS-><a name="value"></a><a href="qslider.html#7b285c">value</a>(); v = (v+2)+v/10; if ( v >= 200 ) { v = 200; <a name="killTimers"></a><a href="qobject.html#0ef111">killTimers</a>(); } magS-><a href="qslider.html#a03234">setValue</a>(v);}/* Called whenever the user has changed one of the matrix parameters (i.e. rotate, shear or magnification)*/void <a name="363"></a>XFormControl::newMtx(){ emit newMatrix( <a name="matrix"></a><a href="#365">matrix</a>() );}void <a name="364"></a>XFormControl::newTxt(const QString& s){ emit newText(s); <a name="changeMode"></a><a href="#368">changeMode</a>(Text);}/* Calculates the matrix appropriate for the current controls, and updates the displays.*/<a href="qwmatrix.html">QWMatrix</a> <a name="365"></a>XFormControl::matrix(){ <a href="qwmatrix.html">QWMatrix</a> m; if (mode != Text) { double magVal = 1.0*magS-><a href="qslider.html#7b285c">value</a>()/100; m.<a name="scale"></a><a href="qwmatrix.html#41a356">scale</a>( magVal, magVal ); } double shearVal = 1.0*shearS-><a href="qslider.html#7b285c">value</a>()/25; m.<a name="shear"></a><a href="qwmatrix.html#b99fbb">shear</a>( shearVal, shearVal ); m.<a name="rotate"></a><a href="qwmatrix.html#71020d">rotate</a>( rotS-><a href="qslider.html#7b285c">value</a>() ); if ( mirror-><a name="isChecked"></a><a href="qcheckbox.html#17b182">isChecked</a>() ) { m.<a href="qwmatrix.html#41a356">scale</a>( 1, -1 ); m.<a href="qwmatrix.html#71020d">rotate</a>( 180 ); } <a href="qstring.html">QString</a> tmp; tmp.<a name="sprintf"></a><a href="qstring.html#926f67">sprintf</a>( "%1.2f", shearVal );⌨️ 快捷键说明
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