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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: qwt_rect.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>qwt_rect.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span><a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span><a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span><a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span><a name="l00005"></a>00005 <span class="comment"> * </span><a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span><a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span><a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span><a name="l00009"></a>00009 <a name="l00010"></a>00010 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00011"></a>00011 <span class="preprocessor">#include "qwt_rect.h"</span><a name="l00012"></a>00012 <a name="l00014"></a>00014 <a name="l00015"></a><a class="code" href="class_qwt_rect.html#b06079fec7a47319073964ca9f3d6e08">00015</a> <a class="code" href="class_qwt_rect.html#b06079fec7a47319073964ca9f3d6e08">QwtRect::QwtRect</a>(): <a name="l00016"></a>00016 QRect() <a name="l00017"></a>00017 {<a name="l00018"></a>00018 }<a name="l00019"></a>00019 <a name="l00021"></a><a class="code" href="class_qwt_rect.html#bc5572f7565f289c6db54482933ea99c">00021</a> <a class="code" href="class_qwt_rect.html#b06079fec7a47319073964ca9f3d6e08">QwtRect::QwtRect</a>(<span class="keyword">const</span> QRect &r): <a name="l00022"></a>00022 QRect(r) <a name="l00023"></a>00023 {<a name="l00024"></a>00024 }<a name="l00025"></a>00025 <a name="l00026"></a>00026 <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span> addPoint(QwtPolygon &pa, uint pos, <span class="keyword">const</span> QPoint &point)<a name="l00027"></a>00027 {<a name="l00028"></a>00028 <span class="keywordflow">if</span> ( uint(pa.size()) <= pos ) <a name="l00029"></a>00029 pa.resize(pos + 5);<a name="l00030"></a>00030 <a name="l00031"></a>00031 pa.setPoint(pos, point);<a name="l00032"></a>00032 }<a name="l00033"></a>00033 <a name="l00035"></a>00035 <a name="l00036"></a><a class="code" href="class_qwt_rect.html#89bfabf3416a3b535451a83e91a12d13">00036</a> QwtPolygon <a class="code" href="class_qwt_rect.html#89bfabf3416a3b535451a83e91a12d13">QwtRect::clip</a>(<span class="keyword">const</span> QwtPolygon &pa)<span class="keyword"> const</span><a name="l00037"></a>00037 <span class="keyword"></span>{<a name="l00038"></a>00038 <span class="keywordflow">if</span> ( contains( pa.boundingRect() ) )<a name="l00039"></a>00039 <span class="keywordflow">return</span> pa;<a name="l00040"></a>00040 <a name="l00041"></a>00041 QwtPolygon cpa(pa.size());<a name="l00042"></a>00042 <a name="l00043"></a>00043 clipEdge((Edge)0, pa, cpa);<a name="l00044"></a>00044 <a name="l00045"></a>00045 <span class="keywordflow">for</span> ( uint edge = 1; edge < NEdges; edge++ ) <a name="l00046"></a>00046 {<a name="l00047"></a>00047 <span class="keyword">const</span> QwtPolygon rpa = cpa;<a name="l00048"></a>00048 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00049"></a>00049 <span class="preprocessor"></span> cpa.detach();<a name="l00050"></a>00050 <span class="preprocessor">#endif</span><a name="l00051"></a>00051 <span class="preprocessor"></span> clipEdge((Edge)edge, rpa, cpa);<a name="l00052"></a>00052 }<a name="l00053"></a>00053 <a name="l00054"></a>00054 <span class="keywordflow">return</span> cpa;<a name="l00055"></a>00055 }<a name="l00056"></a>00056 <a name="l00057"></a>00057 <span class="keywordtype">bool</span> QwtRect::insideEdge(<span class="keyword">const</span> QPoint &p, Edge edge)<span class="keyword"> const</span><a name="l00058"></a>00058 <span class="keyword"></span>{<a name="l00059"></a>00059 <span class="keywordflow">switch</span>(edge) <a name="l00060"></a>00060 {<a name="l00061"></a>00061 <span class="keywordflow">case</span> Left:<a name="l00062"></a>00062 <span class="keywordflow">return</span> p.x() > left();<a name="l00063"></a>00063 <span class="keywordflow">case</span> Top:<a name="l00064"></a>00064 <span class="keywordflow">return</span> p.y() > top();<a name="l00065"></a>00065 <span class="keywordflow">case</span> Right:<a name="l00066"></a>00066 <span class="keywordflow">return</span> p.x() < right();<a name="l00067"></a>00067 <span class="keywordflow">case</span> Bottom:<a name="l00068"></a>00068 <span class="keywordflow">return</span> p.y() < bottom();<a name="l00069"></a>00069 <span class="keywordflow">default</span>:<a name="l00070"></a>00070 <span class="keywordflow">break</span>;<a name="l00071"></a>00071 }<a name="l00072"></a>00072 <a name="l00073"></a>00073 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00074"></a>00074 }<a name="l00075"></a>00075 <a name="l00076"></a>00076 QPoint QwtRect::intersectEdge(<span class="keyword">const</span> QPoint &p1, <a name="l00077"></a>00077 <span class="keyword">const</span> QPoint &p2, Edge edge )<span class="keyword"> const</span><a name="l00078"></a>00078 <span class="keyword"></span>{<a name="l00079"></a>00079 <span class="keywordtype">int</span> x=0, y=0;<a name="l00080"></a>00080 <span class="keywordtype">double</span> m = 0;<a name="l00081"></a>00081 <a name="l00082"></a>00082 <span class="keyword">const</span> <span class="keywordtype">double</span> dy = p2.y() - p1.y();<a name="l00083"></a>00083 <span class="keyword">const</span> <span class="keywordtype">double</span> dx = p2.x() - p1.x();<a name="l00084"></a>00084 <a name="l00085"></a>00085 <span class="keywordflow">switch</span> ( edge ) <a name="l00086"></a>00086 {<a name="l00087"></a>00087 <span class="keywordflow">case</span> Left:<a name="l00088"></a>00088 x = left();<a name="l00089"></a>00089 m = double(qwtAbs(p1.x() - x)) / qwtAbs(dx);<a name="l00090"></a>00090 y = p1.y() + int(dy * m);<a name="l00091"></a>00091 <span class="keywordflow">break</span>;<a name="l00092"></a>00092 <span class="keywordflow">case</span> Top:<a name="l00093"></a>00093 y = top();<a name="l00094"></a>00094 m = double(qwtAbs(p1.y() - y)) / qwtAbs(dy);<a name="l00095"></a>00095 x = p1.x() + int(dx * m);<a name="l00096"></a>00096 <span class="keywordflow">break</span>;<a name="l00097"></a>00097 <span class="keywordflow">case</span> Right:<a name="l00098"></a>00098 x = right();<a name="l00099"></a>00099 m = double(qwtAbs(p1.x() - x)) / qwtAbs(dx);<a name="l00100"></a>00100 y = p1.y() + int(dy * m);<a name="l00101"></a>00101 <span class="keywordflow">break</span>;<a name="l00102"></a>00102 <span class="keywordflow">case</span> Bottom:<a name="l00103"></a>00103 y = bottom();<a name="l00104"></a>00104 m = double(qwtAbs(p1.y() - y)) / qwtAbs(dy);<a name="l00105"></a>00105 x = p1.x() + int(dx * m);<a name="l00106"></a>00106 <span class="keywordflow">break</span>;<a name="l00107"></a>00107 <span class="keywordflow">default</span>:<a name="l00108"></a>00108 <span class="keywordflow">break</span>;<a name="l00109"></a>00109 }<a name="l00110"></a>00110 <a name="l00111"></a>00111 <span class="keywordflow">return</span> QPoint(x,y);<a name="l00112"></a>00112 }<a name="l00113"></a>00113 <a name="l00114"></a>00114 <span class="keywordtype">void</span> QwtRect::clipEdge(Edge edge, <a name="l00115"></a>00115 <span class="keyword">const</span> QwtPolygon &pa, QwtPolygon &cpa)<span class="keyword"> const</span><a name="l00116"></a>00116 <span class="keyword"></span>{<a name="l00117"></a>00117 <span class="keywordflow">if</span> ( pa.count() == 0 )<a name="l00118"></a>00118 {<a name="l00119"></a>00119 cpa.resize(0);<a name="l00120"></a>00120 <span class="keywordflow">return</span>;<a name="l00121"></a>00121 }<a name="l00122"></a>00122 <a name="l00123"></a>00123 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count = 0;<a name="l00124"></a>00124 <a name="l00125"></a>00125 QPoint p1 = pa.point(0);<a name="l00126"></a>00126 <span class="keywordflow">if</span> ( insideEdge(p1, edge) )<a name="l00127"></a>00127 addPoint(cpa, count++, p1);<a name="l00128"></a>00128 <a name="l00129"></a>00129 <span class="keyword">const</span> uint nPoints = pa.size();<a name="l00130"></a>00130 <span class="keywordflow">for</span> ( uint i = 1; i < nPoints; i++ )<a name="l00131"></a>00131 {<a name="l00132"></a>00132 <span class="keyword">const</span> QPoint p2 = pa.point(i);<a name="l00133"></a>00133 <span class="keywordflow">if</span> ( insideEdge(p2, edge) )<a name="l00134"></a>00134 {<a name="l00135"></a>00135 <span class="keywordflow">if</span> ( insideEdge(p1, edge) )<a name="l00136"></a>00136 addPoint(cpa, count++, p2);<a name="l00137"></a>00137 <span class="keywordflow">else</span><a name="l00138"></a>00138 {<a name="l00139"></a>00139 addPoint(cpa, count++, intersectEdge(p1, p2, edge));<a name="l00140"></a>00140 addPoint(cpa, count++, p2);<a name="l00141"></a>00141 }<a name="l00142"></a>00142 }<a name="l00143"></a>00143 <span class="keywordflow">else</span><a name="l00144"></a>00144 {<a name="l00145"></a>00145 <span class="keywordflow">if</span> ( insideEdge(p1, edge) )<a name="l00146"></a>00146 addPoint(cpa, count++, intersectEdge(p1, p2, edge));<a name="l00147"></a>00147 }<a name="l00148"></a>00148 p1 = p2;<a name="l00149"></a>00149 }<a name="l00150"></a>00150 cpa.resize(count);<a name="l00151"></a>00151 }</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Feb 26 21:22:38 2007 for Qwt User's Guide by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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