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366 lines
16 KiB
366 lines
16 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/scribble/scribble.doc:5 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Simple Painting Application</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Simple Painting Application</h1>
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<p>
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This example implements the famous scribble example. You can draw around
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in the canvas with different pens and save the result as picture.
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/scribble.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef SCRIBBLE_H
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#define SCRIBBLE_H
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#include <<a href="qmainwindow-h.html">qmainwindow.h</a>>
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#include <<a href="qpen-h.html">qpen.h</a>>
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#include <<a href="qpoint-h.html">qpoint.h</a>>
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#include <<a href="qpixmap-h.html">qpixmap.h</a>>
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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#include <<a href="qstring-h.html">qstring.h</a>>
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#include <<a href="qpointarray-h.html">qpointarray.h</a>>
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class QMouseEvent;
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class QResizeEvent;
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class QPaintEvent;
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class QToolButton;
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class QSpinBox;
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class Canvas : public <a href="qwidget.html">QWidget</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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Canvas( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
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void setPenColor( const <a href="qcolor.html">QColor</a> &c )
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<a name="x903"></a> { pen.<a href="qpen.html#setColor">setColor</a>( c ); }
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void setPenWidth( int w )
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<a name="x904"></a> { pen.<a href="qpen.html#setWidth">setWidth</a>( w ); }
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<a href="qcolor.html">QColor</a> penColor()
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<a name="x902"></a> { return pen.<a href="qpen.html#color">color</a>(); }
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int penWidth()
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<a name="x905"></a> { return pen.<a href="qpen.html#width">width</a>(); }
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void save( const <a href="qstring.html">QString</a> &filename, const <a href="qstring.html">QString</a> &format );
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void clearScreen();
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protected:
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void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *e );
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void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> *e );
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void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> *e );
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void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> *e );
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e );
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<a href="qpen.html">QPen</a> pen;
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<a href="qpointarray.html">QPointArray</a> polyline;
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bool mousePressed;
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<a href="qpixmap.html">QPixmap</a> buffer;
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};
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class Scribble : public <a href="qmainwindow.html">QMainWindow</a>
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{
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Q_OBJECT
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public:
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Scribble( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
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protected:
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Canvas* canvas;
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<a href="qspinbox.html">QSpinBox</a> *bPWidth;
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<a href="qtoolbutton.html">QToolButton</a> *bPColor, *bSave, *bClear;
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protected slots:
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void slotSave();
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void slotColor();
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void slotWidth( int );
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void slotClear();
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};
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#endif
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</pre>
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/scribble.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "scribble.h"
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qevent-h.html">qevent.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qtoolbar-h.html">qtoolbar.h</a>>
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#include <<a href="qtoolbutton-h.html">qtoolbutton.h</a>>
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#include <<a href="qspinbox-h.html">qspinbox.h</a>>
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#include <<a href="qtooltip-h.html">qtooltip.h</a>>
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#include <<a href="qrect-h.html">qrect.h</a>>
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#include <<a href="qpoint-h.html">qpoint.h</a>>
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#include <<a href="qcolordialog-h.html">qcolordialog.h</a>>
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#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
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#include <<a href="qcursor-h.html">qcursor.h</a>>
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#include <<a href="qimage-h.html">qimage.h</a>>
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#include <<a href="qstrlist-h.html">qstrlist.h</a>>
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#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
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#include <<a href="qintdict-h.html">qintdict.h</a>>
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const bool no_writing = FALSE;
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<a name="f338"></a>Canvas::Canvas( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qwidget.html">QWidget</a>( parent, name, WStaticContents ), pen( Qt::red, 3 ), polyline(3),
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mousePressed( FALSE ), buffer( <a href="qwidget.html#width">width</a>(), height() )
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{
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<a name="x907"></a><a name="x906"></a> if ((qApp-><a href="qapplication.html#argc">argc</a>() > 0) && !buffer.load(qApp-><a href="qapplication.html#argv">argv</a>()[1]))
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buffer.fill( <a href="qwidget.html#colorGroup">colorGroup</a>().base() );
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<a href="qwidget.html#setBackgroundMode">setBackgroundMode</a>( QWidget::PaletteBase );
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#ifndef QT_NO_CURSOR
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<a href="qwidget.html#setCursor">setCursor</a>( Qt::crossCursor );
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#endif
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}
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void <a name="f339"></a>Canvas::save( const <a href="qstring.html">QString</a> &filename, const <a href="qstring.html">QString</a> &format )
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{
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if ( !no_writing )
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<a name="x942"></a> buffer.save( filename, format.<a href="qstring.html#upper">upper</a>() );
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}
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void <a name="f340"></a>Canvas::clearScreen()
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{
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buffer.fill( <a href="qwidget.html#colorGroup">colorGroup</a>().base() );
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<a href="qwidget.html#repaint">repaint</a>( FALSE );
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}
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<a name="x949"></a>void Canvas::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
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{
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mousePressed = TRUE;
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polyline[2] = polyline[1] = polyline[0] = e-><a href="qmouseevent.html#pos">pos</a>();
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}
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<a name="x950"></a>void Canvas::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * )
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{
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mousePressed = FALSE;
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}
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<a name="x948"></a>void Canvas::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
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{
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if ( mousePressed ) {
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<a href="qpainter.html">QPainter</a> painter;
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painter.<a href="qpainter.html#begin">begin</a>( &buffer );
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painter.<a href="qpainter.html#setPen">setPen</a>( pen );
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polyline[2] = polyline[1];
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polyline[1] = polyline[0];
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polyline[0] = e-><a href="qmouseevent.html#pos">pos</a>();
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<a name="x917"></a> painter.<a href="qpainter.html#drawPolyline">drawPolyline</a>( polyline );
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<a name="x918"></a> painter.<a href="qpainter.html#end">end</a>();
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<a href="qrect.html">QRect</a> r = polyline.boundingRect();
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<a name="x928"></a> r = r.<a href="qrect.html#normalize">normalize</a>();
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<a name="x931"></a><a name="x927"></a> r.<a href="qrect.html#setLeft">setLeft</a>( r.<a href="qrect.html#left">left</a>() - penWidth() );
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<a name="x934"></a><a name="x933"></a> r.<a href="qrect.html#setTop">setTop</a>( r.<a href="qrect.html#top">top</a>() - penWidth() );
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<a name="x932"></a><a name="x929"></a> r.<a href="qrect.html#setRight">setRight</a>( r.<a href="qrect.html#right">right</a>() + penWidth() );
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<a name="x930"></a><a name="x925"></a> r.<a href="qrect.html#setBottom">setBottom</a>( r.<a href="qrect.html#bottom">bottom</a>() + penWidth() );
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<a name="x937"></a><a name="x936"></a><a name="x926"></a> <a href="qimage.html#bitBlt">bitBlt</a>( this, r.<a href="qrect.html#x">x</a>(), r.<a href="qrect.html#y">y</a>(), &buffer, r.<a href="qrect.html#x">x</a>(), r.<a href="qrect.html#y">y</a>(), r.<a href="qrect.html#width">width</a>(), r.<a href="qrect.html#height">height</a>() );
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}
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}
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<a name="x952"></a>void Canvas::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> *e )
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{
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QWidget::<a href="qwidget.html#resizeEvent">resizeEvent</a>( e );
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int w = <a href="qwidget.html#width">width</a>() > buffer.width() ?
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<a href="qwidget.html#width">width</a>() : buffer.width();
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int h = <a href="qwidget.html#height">height</a>() > buffer.height() ?
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<a href="qwidget.html#height">height</a>() : buffer.height();
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<a href="qpixmap.html">QPixmap</a> tmp( buffer );
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buffer.resize( w, h );
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buffer.fill( <a href="qwidget.html#colorGroup">colorGroup</a>().base() );
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<a name="x922"></a><a name="x921"></a> <a href="qimage.html#bitBlt">bitBlt</a>( &buffer, 0, 0, &tmp, 0, 0, tmp.<a href="qpixmap.html#width">width</a>(), tmp.<a href="qpixmap.html#height">height</a>() );
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}
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<a name="x951"></a>void Canvas::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> *e )
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{
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QWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( e );
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<a name="x920"></a> <a href="qmemarray.html">QMemArray</a><QRect> rects = e-><a href="qpaintevent.html#region">region</a>().rects();
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<a name="x913"></a> for ( uint i = 0; i < rects.<a href="qmemarray.html#count">count</a>(); i++ ) {
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<a href="qrect.html">QRect</a> r = rects[(int)i];
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<a href="qimage.html#bitBlt">bitBlt</a>( this, r.<a href="qrect.html#x">x</a>(), r.<a href="qrect.html#y">y</a>(), &buffer, r.<a href="qrect.html#x">x</a>(), r.<a href="qrect.html#y">y</a>(), r.<a href="qrect.html#width">width</a>(), r.<a href="qrect.html#height">height</a>() );
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}
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}
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//------------------------------------------------------
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<a name="f341"></a>Scribble::Scribble( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qmainwindow.html">QMainWindow</a>( parent, name )
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{
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canvas = new Canvas( this );
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<a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>( canvas );
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<a href="qtoolbar.html">QToolBar</a> *tools = new <a href="qtoolbar.html">QToolBar</a>( this );
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bSave = new <a href="qtoolbutton.html">QToolButton</a>( QPixmap(), "Save", "Save as PNG image", this, SLOT( slotSave() ), tools );
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<a name="x944"></a> bSave-><a href="qbutton.html#setText">setText</a>( "Save as..." );
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<a name="x943"></a> tools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
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bPColor = new <a href="qtoolbutton.html">QToolButton</a>( QPixmap(), "Choose Pen Color", "Choose Pen Color", this, SLOT( slotColor() ), tools );
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bPColor-><a href="qbutton.html#setText">setText</a>( "Choose Pen Color..." );
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tools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
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bPWidth = new <a href="qspinbox.html">QSpinBox</a>( 1, 20, 1, tools );
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<a name="x945"></a> QToolTip::<a href="qtooltip.html#add">add</a>( bPWidth, "Choose Pen Width" );
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<a name="x939"></a> <a href="qobject.html#connect">connect</a>( bPWidth, SIGNAL( <a href="qspinbox.html#valueChanged">valueChanged</a>( int ) ), this, SLOT( slotWidth( int ) ) );
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<a name="x938"></a> bPWidth-><a href="qspinbox.html#setValue">setValue</a>( 3 );
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tools-><a href="qtoolbar.html#addSeparator">addSeparator</a>();
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bClear = new <a href="qtoolbutton.html">QToolButton</a>( QPixmap(), "Clear Screen", "Clear Screen", this, SLOT( slotClear() ), tools );
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bClear-><a href="qbutton.html#setText">setText</a>( "Clear Screen" );
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}
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void <a name="f342"></a>Scribble::slotSave()
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{
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<a href="qpopupmenu.html">QPopupMenu</a> *menu = new <a href="qpopupmenu.html">QPopupMenu</a>( 0 );
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<a href="qintdict.html">QIntDict</a><QString> formats;
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<a name="x924"></a> formats.<a href="qptrcollection.html#setAutoDelete">setAutoDelete</a>( TRUE );
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for ( unsigned int i = 0; i < QImageIO::<a href="qimageio.html#outputFormats">outputFormats</a>().count(); i++ ) {
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<a name="x911"></a> <a href="qstring.html">QString</a> str = QString( QImageIO::<a href="qimageio.html#outputFormats">outputFormats</a>().at( i ) );
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<a name="x912"></a> formats.<a href="qintdict.html#insert">insert</a>( menu-><a href="qmenudata.html#insertItem">insertItem</a>( QString( "%1..." ).arg( str ) ), new <a href="qstring.html">QString</a>( str ) );
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}
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<a name="x953"></a> menu-><a href="qwidget.html#setMouseTracking">setMouseTracking</a>( TRUE );
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<a name="x947"></a><a name="x946"></a><a name="x923"></a> int id = menu-><a href="qpopupmenu.html#exec">exec</a>( bSave-><a href="qwidget.html#mapToGlobal">mapToGlobal</a>( QPoint( 0, bSave-><a href="qwidget.html#height">height</a>() + 1 ) ) );
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if ( id != -1 ) {
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<a href="qstring.html">QString</a> format = *formats[ id ];
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<a name="x941"></a> <a href="qstring.html">QString</a> filename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>( <a href="qstring.html#QString-null">QString::null</a>, QString( "*.%1" ).arg( format.<a href="qstring.html#lower">lower</a>() ), this );
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if ( !filename.<a href="qstring.html#isEmpty">isEmpty</a>() )
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canvas->save( filename, format );
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}
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delete menu;
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}
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void <a name="f343"></a>Scribble::slotColor()
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{
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<a name="x909"></a> <a href="qcolor.html">QColor</a> c = QColorDialog::<a href="qcolordialog.html#getColor">getColor</a>( canvas->penColor(), this );
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<a name="x908"></a> if ( c.<a href="qcolor.html#isValid">isValid</a>() )
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canvas->setPenColor( c );
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}
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void <a name="f344"></a>Scribble::slotWidth( int w )
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{
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canvas->setPenWidth( w );
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}
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void <a name="f345"></a>Scribble::slotClear()
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{
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canvas->clearScreen();
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}
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</pre>
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<p> <hr>
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<p> Main:
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<p> <pre>/****************************************************************************
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** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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|
** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "scribble.h"
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv );
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Scribble scribble;
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scribble.<a href="qwidget.html#resize">resize</a>( 500, 350 );
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scribble.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Scribble");
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &scribble );
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<a name="x954"></a> if ( QApplication::<a href="qapplication.html#desktop">desktop</a>()->width() > 550
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&& QApplication::<a href="qapplication.html#desktop">desktop</a>()->height() > 366 )
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scribble.<a href="qwidget.html#show">show</a>();
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else
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<a name="x960"></a> scribble.<a href="qwidget.html#showMaximized">showMaximized</a>();
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return a.<a href="qapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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