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187 lines
6.8 KiB
187 lines
6.8 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/drawlines/drawlines.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>Connect the Points</title>
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<body>
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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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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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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>Connect the Points</h1>
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<p>
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This example shows very simple mouse-based user interaction and
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painting without any world transform matrix or other advanced
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features. Run the program, click the button, move the mouse,
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release the button, and watch the lines get drawn.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/connect.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 TQt. 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 <<a href="tqwidget-h.html">tqwidget.h</a>>
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#include <<a href="tqpainter-h.html">tqpainter.h</a>>
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <stdlib.h>
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const int MAXPOINTS = 2000; // maximum number of points
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const int MAXCOLORS = 40;
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//
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// ConnectWidget - draws connected lines
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//
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class ConnectWidget : public <a href="tqwidget.html">TQWidget</a>
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{
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public:
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ConnectWidget( <a href="tqwidget.html">TQWidget</a> *parent=0, const char *name=0 );
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~ConnectWidget();
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protected:
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void paintEvent( <a href="tqpaintevent.html">TQPaintEvent</a> * );
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void mousePressEvent( <a href="qmouseevent.html">TQMouseEvent</a> *);
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void mouseReleaseEvent( <a href="qmouseevent.html">TQMouseEvent</a> *);
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void mouseMoveEvent( <a href="qmouseevent.html">TQMouseEvent</a> *);
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private:
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<a href="tqpoint.html">TQPoint</a> *points; // point array
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<a href="tqcolor.html">TQColor</a> *colors; // color array
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int count; // count = number of points
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bool down; // TRUE if mouse down
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};
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//
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// Constructs a ConnectWidget.
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//
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<a name="f475"></a>ConnectWidget::ConnectWidget( <a href="tqwidget.html">TQWidget</a> *parent, const char *name )
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: <a href="tqwidget.html">TQWidget</a>( parent, name, WStaticContents )
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{
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<a href="tqwidget.html#setBackgroundColor">setBackgroundColor</a>( white ); // white background
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count = 0;
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down = FALSE;
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points = new <a href="tqpoint.html">TQPoint</a>[MAXPOINTS];
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colors = new <a href="tqcolor.html">TQColor</a>[MAXCOLORS];
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for ( int i=0; i<MAXCOLORS; i++ ) // init color array
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colors[i] = TQColor( rand()&255, rand()&255, rand()&255 );
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}
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ConnectWidget::~ConnectWidget()
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{
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delete[] points; // cleanup
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delete[] colors;
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}
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//
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// Handles paint events for the connect widget.
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//
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<a name="x1661"></a>void ConnectWidget::<a href="tqwidget.html#paintEvent">paintEvent</a>( <a href="tqpaintevent.html">TQPaintEvent</a> * )
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{
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<a href="tqpainter.html">TQPainter</a> paint( this );
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for ( int i=0; i<count-1; i++ ) { // connect all points
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for ( int j=i+1; j<count; j++ ) {
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paint.<a href="tqpainter.html#setPen">setPen</a>( colors[rand()%MAXCOLORS] ); // set random pen color
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<a name="x1655"></a> paint.<a href="tqpainter.html#drawLine">drawLine</a>( points[i], points[j] ); // draw line
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}
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}
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}
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//
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// Handles mouse press events for the connect widget.
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//
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<a name="x1659"></a>void ConnectWidget::<a href="tqwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * )
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{
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down = TRUE;
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count = 0; // start recording points
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<a href="tqwidget.html#erase">erase</a>(); // erase widget contents
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}
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//
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// Handles mouse release events for the connect widget.
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//
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<a name="x1660"></a>void ConnectWidget::<a href="tqwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * )
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{
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down = FALSE; // done recording points
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<a href="tqwidget.html#update">update</a>(); // draw the lines
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}
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//
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// Handles mouse move events for the connect widget.
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//
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<a name="x1658"></a>void ConnectWidget::<a href="tqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e )
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{
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if ( down && count < MAXPOINTS ) {
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<a href="tqpainter.html">TQPainter</a> paint( this );
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<a name="x1654"></a> points[count++] = e-><a href="qmouseevent.html#pos">pos</a>(); // add point
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<a name="x1656"></a> paint.<a href="tqpainter.html#drawPoint">drawPoint</a>( e-><a href="qmouseevent.html#pos">pos</a>() ); // plot point
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}
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}
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//
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// Create and display a ConnectWidget.
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//
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int main( int argc, char **argv )
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{
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<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
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ConnectWidget connect;
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#ifndef TQT_NO_WIDGET_TOPEXTRA // for TQt/Embedded minimal build
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connect.<a href="tqwidget.html#setCaption">setCaption</a>( "TQt Example - Draw lines");
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#endif
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a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &connect );
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connect.<a href="tqwidget.html#show">show</a>();
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return a.<a href="ntqapplication.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>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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