drawdemo-drawdemo-cpp.html
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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 - drawdemo/drawdemo.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>Draw Demo</h1><br clear="all"> This example demonstrates several drawing functions and printer output. You can easily add you own drawing functions. See "ourDrawFunctions". <hr> Implementation:<pre>/****************************************************************************** $Id: qt/examples/drawdemo/drawdemo.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="qwidget.h"></a><a href="qwidget-h.html">qwidget.h</a>>#include <<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>>#include <<a name="qprinter.h"></a><a href="qprinter-h.html">qprinter.h</a>>#include <<a name="qpushbutton.h"></a><a href="qpushbutton-h.html">qpushbutton.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="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>#include <math.h>//// This function draws a color wheel.// The coordinate system x=(0..500), y=(0..500) spans the paint device.//void drawColorWheel( <a name="QPainter"></a><a href="qpainter.html">QPainter</a> *p ){ <a name="QFont"></a><a href="qfont.html">QFont</a> f( "times", 18, QFont::Bold ); p-><a name="setFont"></a><a href="qpainter.html#998df2">setFont</a>( f ); p-><a name="setPen"></a><a href="qpainter.html#0183e4">setPen</a>( Qt::black ); p-><a name="setWindow"></a><a href="qpainter.html#ad8b2b">setWindow</a>( 0, 0, 500, 500 ); // defines coordinate system for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles <a name="QWMatrix"></a><a href="qwmatrix.html">QWMatrix</a> matrix; matrix.<a name="translate"></a><a href="qwmatrix.html#e4b716">translate</a>( 250.0F, 250.0F ); // move to center matrix.<a name="shear"></a><a href="qwmatrix.html#b99fbb">shear</a>( 0.0F, 0.3F ); // twist it matrix.<a name="rotate"></a><a href="qwmatrix.html#71020d">rotate</a>( (float)i*10 ); // rotate 0,10,20,.. degrees p-><a name="setWorldMatrix"></a><a href="qpainter.html#862c4d">setWorldMatrix</a>( matrix ); // use this world matrix <a name="QColor"></a><a href="qcolor.html">QColor</a> c; c.<a name="setHsv"></a><a href="qcolor.html#e47175">setHsv</a>( i*10, 255, 255 ); // rainbow effect p-><a name="setBrush"></a><a href="qpainter.html#3e0cc8">setBrush</a>( c ); // solid fill with color c p-><a name="drawRect"></a><a href="qpainter.html#4c0077">drawRect</a>( 70, -10, 80, 10 ); // draw the rectangle <a name="QString"></a><a href="qstring.html">QString</a> n; n.<a name="sprintf"></a><a href="qstring.html#926f67">sprintf</a>( "H=%d", i*10 ); p-><a name="drawText"></a><a href="qpainter.html#0f088f">drawText</a>( 80+70+5, 0, n ); // draw the hue number }}//// This function draws a few lines of text using different fonts.//void drawFonts( <a href="qpainter.html">QPainter</a> *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] ) { <a href="qfont.html">QFont</a> font( fonts[f], sizes[s] ); p-><a href="qpainter.html#998df2">setFont</a>( font ); <a name="QFontMetrics"></a><a href="qfontmetrics.html">QFontMetrics</a> fm = p-><a name="fontMetrics"></a><a href="qpainter.html#73b2e5">fontMetrics</a>(); y += fm.<a name="ascent"></a><a href="qfontmetrics.html#72c9fb">ascent</a>(); p-><a href="qpainter.html#0f088f">drawText</a>( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" ); y += fm.<a name="descent"></a><a href="qfontmetrics.html#200b74">descent</a>(); s++; } f++; }}//// This function draws some shapes//void drawShapes( <a href="qpainter.html">QPainter</a> *p ){ <a name="QBrush"></a><a href="qbrush.html">QBrush</a> b1( Qt::blue ); <a href="qbrush.html">QBrush</a> b2( Qt::green, Qt::Dense6Pattern ); // green 12% fill <a href="qbrush.html">QBrush</a> b3( Qt::NoBrush ); // void brush <a href="qbrush.html">QBrush</a> b4( Qt::CrossPattern ); // black cross pattern p-><a href="qpainter.html#0183e4">setPen</a>( Qt::red ); p-><a href="qpainter.html#3e0cc8">setBrush</a>( b1 ); p-><a href="qpainter.html#4c0077">drawRect</a>( 10, 10, 200, 100 ); p-><a href="qpainter.html#3e0cc8">setBrush</a>( b2 ); p-><a name="drawRoundRect"></a><a href="qpainter.html#887bfb">drawRoundRect</a>( 10, 150, 200, 100, 20, 20 ); p-><a href="qpainter.html#3e0cc8">setBrush</a>( b3 ); p-><a name="drawEllipse"></a><a href="qpainter.html#f4ec3a">drawEllipse</a>( 250, 10, 200, 100 ); p-><a href="qpainter.html#3e0cc8">setBrush</a>( b4 ); p-><a name="drawPie"></a><a href="qpainter.html#3ca7a2">drawPie</a>( 250, 150, 200, 100, 45*16, 90*16 );}typedef void (*draw_func)(<a href="qpainter.html">QPainter</a>*);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 } };//// DrawView has installable draw routines, just add a function pointer// and a text in the table above.//class DrawView : public QWidget{ Q_OBJECTpublic: DrawView(); ~DrawView();public slots: void updateIt( int ); void printIt();protected: void drawIt( <a href="qpainter.html">QPainter</a> * ); void paintEvent( <a name="QPaintEvent"></a><a href="qpaintevent.html">QPaintEvent</a> * ); void resizeEvent( <a name="QResizeEvent"></a><a href="qresizeevent.html">QResizeEvent</a> * );private: <a name="QPrinter"></a><a href="qprinter.html">QPrinter</a> *printer; <a name="QButtonGroup"></a><a href="qbuttongroup.html">QButtonGroup</a> *bgroup; <a name="QPushButton"></a><a href="qpushbutton.html">QPushButton</a> *print; int drawindex; int maxindex;};//// Construct the DrawView with buttons.//DrawView::DrawView(){ <a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>( "Qt Draw Demo Application" ); <a name="setBackgroundColor"></a><a href="qwidget.html#c09181">setBackgroundColor</a>( white ); // Create a button group to contain all buttons bgroup = new <a href="qbuttongroup.html">QButtonGroup</a>( this ); bgroup-><a name="resize"></a><a href="qwidget.html#ff9d07">resize</a>( 200, 200 ); <a name="connect"></a><a href="qobject.html#fbde73">connect</a>( bgroup, SIGNAL(clicked(int)), SLOT(<a name="updateIt"></a><a href="#75">updateIt</a>(int)) ); // Calculate the size for the radio buttons int maxwidth = 80; int i; const char *n; <a href="qfontmetrics.html">QFontMetrics</a> fm = bgroup-><a name="fontMetrics"></a><a href="qwidget.html#386569">fontMetrics</a>(); for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) { int w = fm.<a name="width"></a><a href="qfontmetrics.html#3b6f39">width</a>( n ); maxwidth = QMAX(w,maxwidth); } maxwidth = maxwidth + 20; // add 20 pixels for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) { <a name="QRadioButton"></a><a href="qradiobutton.html">QRadioButton</a> *rb = new <a href="qradiobutton.html">QRadioButton</a>( n, bgroup ); rb-><a name="setGeometry"></a><a href="qwidget.html#9ede68">setGeometry</a>( 10, i*30+10, maxwidth, 30 ); if ( i == 0 ) rb-><a name="setChecked"></a><a href="qradiobutton.html#0e50fc">setChecked</a>( TRUE ); } drawindex = 0; // draw first thing maxindex = i; maxwidth += 40; // now size of bgroup printer = new <a href="qprinter.html">QPrinter</a>; // Create and setup the print button print = new <a href="qpushbutton.html">QPushButton</a>( "Print...", bgroup ); print-><a name="resize"></a><a href="qpushbutton.html#13fb8e">resize</a>( 80, 30 ); print-><a name="move"></a><a href="qpushbutton.html#ede724">move</a>( maxwidth/2 - print-><a name="width"></a><a href="qwidget.html#2edab1">width</a>()/2, maxindex*30+20 ); <a href="qobject.html#fbde73">connect</a>( print, SIGNAL(clicked()), SLOT(<a name="printIt"></a><a href="#77">printIt</a>()) ); bgroup-><a href="qwidget.html#ff9d07">resize</a>( maxwidth, print-><a name="y"></a><a href="qwidget.html#800909">y</a>()+print-><a name="height"></a><a href="qwidget.html#e3c588">height</a>()+10 ); <a name="resize"></a><a href="qwidget.html#8fcbbe">resize</a>( 640,300 );}//// Clean up//DrawView::~DrawView(){#ifndef QT_NO_PRINTER delete printer;#endif}//// Called when a radio button is clicked.//void <a name="75"></a>DrawView::updateIt( int index ){ if ( index < maxindex ) { drawindex = index; <a name="update"></a><a href="qwidget.html#a66a88">update</a>(); }}//// Calls the drawing function as specified by the radio buttons.//void <a name="76"></a>DrawView::drawIt( <a href="qpainter.html">QPainter</a> *p ){ (*ourDrawFunctions[drawindex].f)(p);}//// Called when the print button is clicked.//void <a name="77"></a>DrawView::printIt(){#ifndef QT_NO_PRINTER if ( printer-><a name="setup"></a><a href="qprinter.html#c3cd23">setup</a>( this ) ) { <a href="qpainter.html">QPainter</a> paint; if ( !paint.<a name="begin"></a><a href="qpainter.html#02ed5d">begin</a>( printer ) ) return; <a name="drawIt"></a><a href="#76">drawIt</a>( &paint ); }#endif}//// Called when the widget needs to be updated.//void <a name="78"></a>DrawView::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * ){ <a href="qpainter.html">QPainter</a> paint( this ); <a href=#76>drawIt</a>( &paint );}//// Called when the widget has been resized.// Moves the button group to the upper right corner// of the widget.void <a name="79"></a>DrawView::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * ){ bgroup-><a name="move"></a><a href="qwidget.html#f753ed">move</a>( <a href="qwidget.html#2edab1">width</a>()-bgroup-><a href="qwidget.html#2edab1">width</a>(), 0 );}//// Create and display our widget.//#include "drawdemo.moc"int main( int argc, char **argv ){ <a name="QApplication"></a><a href="qapplication.html">QApplication</a> app( argc, argv ); DrawView draw; app.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &draw ); draw.<a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Drawdemo"); draw.<a name="show"></a><a href="qwidget.html#200ee5">show</a>(); return app.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();}</pre><p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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