<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/drawdemo/drawdemo.doc:4 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Draw Demo</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Draw Demo</h1> <p> This example demonstrates several drawing functions and printer output. You can easily add you own drawing functions. <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/drawdemo.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include <<a href="qwidget-h.html">ntqwidget.h</a>> #include <<a href="qpainter-h.html">ntqpainter.h</a>> #include <<a href="qprinter-h.html">ntqprinter.h</a>> #include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>> #include <<a href="qradiobutton-h.html">ntqradiobutton.h</a>> #include <<a href="qbuttongroup-h.html">ntqbuttongroup.h</a>> #include <<a href="qapplication-h.html">ntqapplication.h</a>> #include <math.h> // // First we define the functionality our demo should present // to the user. You might add different demo-modes if you wish so. // // // This function draws a color wheel. // The coordinate system x=(0..500), y=(0..500) spans the paint device. // void drawColorWheel( <a href="ntqpainter.html">TQPainter</a> *p ) { <a href="ntqfont.html">TQFont</a> f( "times", 18, TQFont::Bold ); <a name="x1075"></a> p-><a href="ntqpainter.html#setFont">setFont</a>( f ); <a name="x1076"></a> p-><a href="ntqpainter.html#setPen">setPen</a>( TQt::black ); <a name="x1077"></a> p-><a href="ntqpainter.html#setWindow">setWindow</a>( 0, 0, 500, 500 ); // defines coordinate system for ( int i=0; i<36; i++ ) { // draws 36 rotated rectangles <a href="ntqwmatrix.html">TQWMatrix</a> matrix; <a name="x1097"></a> matrix.<a href="ntqwmatrix.html#translate">translate</a>( 250.0F, 250.0F ); // move to center <a name="x1096"></a> matrix.<a href="ntqwmatrix.html#shear">shear</a>( 0.0F, 0.3F ); // twist it <a name="x1095"></a> matrix.<a href="ntqwmatrix.html#rotate">rotate</a>( (float)i*10 ); // rotate 0,10,20,.. degrees <a name="x1078"></a> p-><a href="ntqpainter.html#setWorldMatrix">setWorldMatrix</a>( matrix ); // use this world matrix <a href="ntqcolor.html">TQColor</a> c; <a name="x1063"></a> c.<a href="ntqcolor.html#setHsv">setHsv</a>( i*10, 255, 255 ); // rainbow effect <a name="x1074"></a> p-><a href="ntqpainter.html#setBrush">setBrush</a>( c ); // solid fill with color c <a name="x1070"></a> p-><a href="ntqpainter.html#drawRect">drawRect</a>( 70, -10, 80, 10 ); // draw the rectangle <a href="ntqstring.html">TQString</a> n; n.<a href="ntqstring.html#sprintf">sprintf</a>( "H=%d", i*10 ); <a name="x1072"></a> p-><a href="ntqpainter.html#drawText">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="ntqpainter.html">TQPainter</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="ntqfont.html">TQFont</a> font( fonts[f], sizes[s] ); p-><a href="ntqpainter.html#setFont">setFont</a>( font ); <a name="x1073"></a> <a href="ntqfontmetrics.html">TQFontMetrics</a> fm = p-><a href="ntqpainter.html#fontMetrics">fontMetrics</a>(); <a name="x1064"></a> y += fm.<a href="ntqfontmetrics.html#ascent">ascent</a>(); p-><a href="ntqpainter.html#drawText">drawText</a>( 10, y, "Quartz Glyph Job Vex'd Cwm Finks" ); <a name="x1065"></a> y += fm.<a href="ntqfontmetrics.html#descent">descent</a>(); s++; } f++; } } // // This function draws some shapes // void drawShapes( <a href="ntqpainter.html">TQPainter</a> *p ) { <a href="ntqbrush.html">TQBrush</a> b1( TQt::blue ); <a href="ntqbrush.html">TQBrush</a> b2( TQt::green, TQt::Dense6Pattern ); // green 12% fill <a href="ntqbrush.html">TQBrush</a> b3( TQt::NoBrush ); // void brush <a href="ntqbrush.html">TQBrush</a> b4( TQt::CrossPattern ); // black cross pattern p-><a href="ntqpainter.html#setPen">setPen</a>( TQt::red ); p-><a href="ntqpainter.html#setBrush">setBrush</a>( b1 ); p-><a href="ntqpainter.html#drawRect">drawRect</a>( 10, 10, 200, 100 ); p-><a href="ntqpainter.html#setBrush">setBrush</a>( b2 ); <a name="x1071"></a> p-><a href="ntqpainter.html#drawRoundRect">drawRoundRect</a>( 10, 150, 200, 100, 20, 20 ); p-><a href="ntqpainter.html#setBrush">setBrush</a>( b3 ); <a name="x1068"></a> p-><a href="ntqpainter.html#drawEllipse">drawEllipse</a>( 250, 10, 200, 100 ); p-><a href="ntqpainter.html#setBrush">setBrush</a>( b4 ); <a name="x1069"></a> p-><a href="ntqpainter.html#drawPie">drawPie</a>( 250, 150, 200, 100, 45*16, 90*16 ); } typedef void (*draw_func)(TQPainter*); struct DrawThing { draw_func f; const char *name; }; // // All previously implemented functions are collected // in the following "table". // If you implement different functionality, your new draw // function must be assigned here with a function pointer and // description. // Leave the zeros at the end, they will be used // as markers referring to the end of the array. // DrawThing ourDrawFunctions[] = { // name of the function, title presented to the user { drawColorWheel, "Draw color wheel" }, { drawFonts, "Draw fonts" }, { drawShapes, "Draw shapes" }, { 0, 0 } }; class DrawView : public <a href="ntqwidget.html">TQWidget</a> { <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a> public: DrawView(); ~DrawView(); public slots: void updateIt( int ); void printIt(); protected: void drawIt( <a href="ntqpainter.html">TQPainter</a> * ); void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * ); void resizeEvent( <a href="qresizeevent.html">TQResizeEvent</a> * ); private: <a href="ntqprinter.html">TQPrinter</a> *printer; <a href="ntqbuttongroup.html">TQButtonGroup</a> *bgroup; <a href="ntqpushbutton.html">TQPushButton</a> *print; int drawindex; int maxindex; }; // // Construct the DrawView with buttons. // <a name="f367"></a>DrawView::DrawView() { <a href="ntqwidget.html#setCaption">setCaption</a>( "TQt Draw Demo Application" ); <a href="ntqwidget.html#setBackgroundMode">setBackgroundMode</a>(PaletteBase); // Create a button group to contain all buttons bgroup = new <a href="ntqbuttongroup.html">TQButtonGroup</a>( this ); <a name="x1088"></a> bgroup-><a href="ntqwidget.html#resize">resize</a>( 200, 200 ); <a name="x1062"></a> <a href="ntqobject.html#connect">connect</a>( bgroup, SIGNAL(<a href="ntqbuttongroup.html#clicked">clicked</a>(int)), SLOT(updateIt(int)) ); // Calculate the size for the radio buttons int maxwidth = 80; int maxheight = 10; int i; const char *n; <a name="x1084"></a> <a href="ntqfontmetrics.html">TQFontMetrics</a> fm = bgroup-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>(); // Find out the longest function description. // Here we make use of the last "0,0"-entry in the // ourDrawFunctions-array. for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) { <a name="x1066"></a> int w = fm.<a href="ntqfontmetrics.html#width">width</a>( n ); maxwidth = TQMAX(w,maxwidth); // TQMAX is a macro defined in ntqglobal.h // and returns the biggest of to values. // Due to its macro nature one should use it with care and with // constant parameters only. } maxwidth = maxwidth + 30; // allow 30 pixels for radiobuttons for ( i=0; (n=ourDrawFunctions[i].name) != 0; i++ ) { <a href="ntqradiobutton.html">TQRadioButton</a> *rb = new <a href="ntqradiobutton.html">TQRadioButton</a>( n, bgroup ); <a name="x1091"></a> rb-><a href="ntqwidget.html#setGeometry">setGeometry</a>( 10, i*30+10, maxwidth, 30 ); maxheight += 30; if ( i == 0 ) <a name="x1082"></a> rb-><a href="ntqradiobutton.html#setChecked">setChecked</a>( TRUE ); } maxheight += 10; // maxheight is now 10 pixels upper margin // plus number_of_drawfunctions * 30 // plus 10 pixels lower margin drawindex = 0; // draw first thing maxindex = i; maxwidth += 20; // add some margin, this results in the // final width of bgroup bgroup-><a href="ntqwidget.html#resize">resize</a>( maxwidth, maxheight ); // resize bgroup to its final size // when no printersupport is provided // If -- at compile time -- printer support will be disabled, // we won't set up printing functionality. #ifndef TQT_NO_PRINTER printer = new <a href="ntqprinter.html">TQPrinter</a>; // Create and setup the print button print = new <a href="ntqpushbutton.html">TQPushButton</a>( "Print...", bgroup ); <a name="x1081"></a> print-><a href="ntqwidget.html#resize">resize</a>( 80, 30 ); <a name="x1093"></a><a name="x1080"></a> print-><a href="ntqwidget.html#move">move</a>( maxwidth/2 - print-><a href="ntqwidget.html#width">width</a>()/2, maxindex*30+20 ); <a href="ntqobject.html#connect">connect</a>( print, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), SLOT(printIt()) ); // Resize bgroup to its final size when printersupport is given. <a name="x1094"></a><a name="x1085"></a> bgroup-><a href="ntqwidget.html#resize">resize</a>( maxwidth, print-><a href="ntqwidget.html#y">y</a>()+print-><a href="ntqwidget.html#height">height</a>()+10 ); #endif <a href="ntqwidget.html#resize">resize</a>( 640,300 ); } // // Clean up. // DrawView::~DrawView() { #ifndef TQT_NO_PRINTER delete printer; #endif } // // Called when a radio button is clicked. // void <a name="f368"></a>DrawView::updateIt( int index ) { if ( index < maxindex ) { drawindex = index; <a href="ntqwidget.html#update">update</a>(); } } // // Calls the drawing function as specified by the radio buttons. // void <a name="f369"></a>DrawView::drawIt( <a href="ntqpainter.html">TQPainter</a> *p ) { (*ourDrawFunctions[drawindex].f)(p); } // // Called when the print button is clicked. // void <a name="f370"></a>DrawView::printIt() { <a name="x1079"></a> if ( printer-><a href="ntqprinter.html#setup">setup</a>( this ) ) { <a href="ntqpainter.html">TQPainter</a> paint; <a name="x1067"></a> if( !paint.<a href="ntqpainter.html#begin">begin</a>( printer ) ) return; drawIt( &paint ); } } // // Called when the widget needs to be updated. // void DrawView::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * ) { <a href="ntqpainter.html">TQPainter</a> paint( this ); drawIt( &paint ); } // // Called when the widget has been resized. // Moves the button group to the upper right corner // of the widget. <a name="x1089"></a>void DrawView::<a href="ntqwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">TQResizeEvent</a> * ) { <a name="x1086"></a> bgroup-><a href="ntqwidget.html#move">move</a>( <a href="ntqwidget.html#width">width</a>()-bgroup-><a href="ntqwidget.html#width">width</a>(), 0 ); } // // Create and display our widget. // #include "drawdemo.moc" int main( int argc, char **argv ) { <a href="ntqapplication.html">TQApplication</a> app( argc, argv ); DrawView draw; app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &draw ); draw.<a href="ntqwidget.html#setCaption">setCaption</a>("TQt Example - Drawdemo"); draw.<a href="ntqwidget.html#show">show</a>(); return app.<a href="ntqapplication.html#exec">exec</a>(); } </pre> <p>See also <a href="examples.html">Examples</a>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>TQt 3.3.8</div> </table></div></address></body> </html>