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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>qwt_rect.cpp</h1><pre class="fragment"><div>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span>
00002 <span class="comment"> * Qwt Widget Library</span>
00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span>
00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span>
00005 <span class="comment"> * </span>
00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
00008 <span class="comment"> *****************************************************************************/</span>
00009
00010 <span class="preprocessor">#include <qpointarray.h></span>
00011 <span class="preprocessor">#include "qwt_rect.h"</span>
00012
00014
<a name="l00015"></a><a class="code" href="class_qwt_rect.html#a0">00015</a> <a class="code" href="class_qwt_rect.html#a0">QwtRect::QwtRect</a>():
00016 QRect()
00017 {
00018 }
00019
<a name="l00021"></a><a class="code" href="class_qwt_rect.html#a1">00021</a> <a class="code" href="class_qwt_rect.html#a0">QwtRect::QwtRect</a>(<span class="keyword">const</span> QRect &r):
00022 QRect(r)
00023 {
00024 }
00025
00026 QRect QwtRect::cutTop(<span class="keywordtype">int</span> h, <span class="keywordtype">int</span> distTop, <span class="keywordtype">int</span> distBottom)
00027 {
00028 QRect rv;
00029 rv.setTop(top() + distTop);
00030 rv.setHeight(h);
00031 setTop(rv.bottom() + distBottom + 1);
00032 rv.setLeft(left());
00033 rv.setRight(right());
00034 <span class="keywordflow">return</span> rv;
00035 }
00036
00037 QRect QwtRect::cutBottom(<span class="keywordtype">int</span> h, <span class="keywordtype">int</span> distTop, <span class="keywordtype">int</span> distBottom)
00038 {
00039 QRect rv;
00040 setBottom(bottom() - h - distBottom - distTop);
00041 rv.setTop(bottom() + 1 + distTop);
00042 rv.setHeight(h);
00043 rv.setLeft(left());
00044 rv.setRight(right());
00045 <span class="keywordflow">return</span> rv;
00046 }
00047
00048 QRect QwtRect::cutLeft(<span class="keywordtype">int</span> w, <span class="keywordtype">int</span> distLeft, <span class="keywordtype">int</span> distRight)
00049 {
00050 QRect rv;
00051 rv.setLeft(left() + distLeft);
00052 rv.setWidth(w);
00053 setLeft(rv.right() + distRight + 1);
00054 rv.setTop(top());
00055 rv.setBottom(bottom());
00056 <span class="keywordflow">return</span> rv;
00057 }
00058
00059 QRect QwtRect::cutRight(<span class="keywordtype">int</span> w, <span class="keywordtype">int</span> distLeft, <span class="keywordtype">int</span> distRight)
00060 {
00061 QRect rv;
00062 setRight(right() - w - distRight - distLeft);
00063 rv.setLeft(right() + 1 + distLeft);
00064 rv.setWidth(w);
00065 rv.setTop(top());
00066 rv.setBottom(bottom());
00067 <span class="keywordflow">return</span> rv;
00068 }
00069
00070 <span class="keyword">const</span> <a class="code" href="class_qwt_rect.html">QwtRect</a>& QwtRect::cutMargin(<span class="keywordtype">int</span> mLeft, <span class="keywordtype">int</span> mRight, <span class="keywordtype">int</span> mTop, <span class="keywordtype">int</span> mBottom)
00071 {
00072 setHeight(height() - mTop - mBottom);
00073 setWidth(width() - mLeft - mRight);
00074 moveBy(mLeft, mTop);
00075 <span class="keywordflow">return</span> *<span class="keyword">this</span>;
00076 }
00077
00078 <span class="keyword">inline</span> <span class="keywordtype">void</span> addPoint(QPointArray &pa, uint pos, <span class="keyword">const</span> QPoint &point)
00079 {
00080 <span class="keywordflow">if</span> ( pa.size() <= pos )
00081 pa.resize(pos + 5);
00082
00083 pa.setPoint(pos, point);
00084 }
00085
00087
<a name="l00088"></a><a class="code" href="class_qwt_rect.html#a7">00088</a> QPointArray <a class="code" href="class_qwt_rect.html#a7">QwtRect::clip</a>(<span class="keyword">const</span> QPointArray &pa)<span class="keyword"> const</span>
00089 <span class="keyword"></span>{
00090 <span class="keywordflow">if</span> ( contains( pa.boundingRect() ) )
00091 <span class="keywordflow">return</span> pa;
00092
00093 QPointArray cpa(pa.size());
00094
00095 <span class="keywordflow">for</span> ( uint edge = 0; edge < NEdges; edge++ )
00096 {
00097 <span class="keyword">const</span> QPointArray rpa = (edge == 0) ? pa : cpa.copy();
00098 clipEdge((Edge)edge, rpa, cpa);
00099 }
00100
00101 <span class="keywordflow">return</span> cpa;
00102 }
00103
00104 <span class="keywordtype">bool</span> QwtRect::insideEdge(<span class="keyword">const</span> QPoint &p, Edge edge)<span class="keyword"> const</span>
00105 <span class="keyword"></span>{
00106 <span class="keywordflow">switch</span>(edge)
00107 {
00108 <span class="keywordflow">case</span> Left:
00109 <span class="keywordflow">return</span> p.x() > left();
00110 <span class="keywordflow">case</span> Top:
00111 <span class="keywordflow">return</span> p.y() > top();
00112 <span class="keywordflow">case</span> Right:
00113 <span class="keywordflow">return</span> p.x() < right();
00114 <span class="keywordflow">case</span> Bottom:
00115 <span class="keywordflow">return</span> p.y() < bottom();
00116 <span class="keywordflow">default</span>:
00117 <span class="keywordflow">break</span>;
00118 }
00119
00120 <span class="keywordflow">return</span> FALSE;
00121 }
00122
00123 QPoint QwtRect::intersectEdge(<span class="keyword">const</span> QPoint &p1,
00124 <span class="keyword">const</span> QPoint &p2, Edge edge )<span class="keyword"> const</span>
00125 <span class="keyword"></span>{
00126 <span class="keywordtype">int</span> x=0, y=0;
00127 <span class="keywordtype">double</span> m = 0;
00128
00129 <span class="keyword">const</span> <span class="keywordtype">double</span> dy = p2.y() - p1.y();
00130 <span class="keyword">const</span> <span class="keywordtype">double</span> dx = p2.x() - p1.x();
00131
00132 <span class="keywordflow">switch</span> ( edge )
00133 {
00134 <span class="keywordflow">case</span> Left:
00135 x = left();
00136 m = double(QABS(p1.x() - x)) / QABS(dx);
00137 y = p1.y() + int(dy * m);
00138 <span class="keywordflow">break</span>;
00139 <span class="keywordflow">case</span> Top:
00140 y = top();
00141 m = double(QABS(p1.y() - y)) / QABS(dy);
00142 x = p1.x() + int(dx * m);
00143 <span class="keywordflow">break</span>;
00144 <span class="keywordflow">case</span> Right:
00145 x = right();
00146 m = double(QABS(p1.x() - x)) / QABS(dx);
00147 y = p1.y() + int(dy * m);
00148 <span class="keywordflow">break</span>;
00149 <span class="keywordflow">case</span> Bottom:
00150 y = bottom();
00151 m = double(QABS(p1.y() - y)) / QABS(dy);
00152 x = p1.x() + int(dx * m);
00153 <span class="keywordflow">break</span>;
00154 <span class="keywordflow">default</span>:
00155 <span class="keywordflow">break</span>;
00156 }
00157
00158 <span class="keywordflow">return</span> QPoint(x,y);
00159 }
00160
00161 <span class="keywordtype">void</span> QwtRect::clipEdge(Edge edge, <span class="keyword">const</span> QPointArray &pa, QPointArray &cpa)<span class="keyword"> const</span>
00162 <span class="keyword"></span>{
00163 <span class="keywordflow">if</span> ( pa.count() == 0 )
00164 {
00165 cpa.resize(0);
00166 <span class="keywordflow">return</span>;
00167 }
00168
00169 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count = 0;
00170
00171 QPoint p1 = pa.point(0);
00172 <span class="keywordflow">if</span> ( insideEdge(p1, edge) )
00173 addPoint(cpa, count++, p1);
00174
00175 <span class="keyword">const</span> uint nPoints = pa.size();
00176 <span class="keywordflow">for</span> ( uint i = 1; i < nPoints; i++ )
00177 {
00178 <span class="keyword">const</span> QPoint p2 = pa.point(i);
00179 <span class="keywordflow">if</span> ( insideEdge(p2, edge) )
00180 {
00181 <span class="keywordflow">if</span> ( insideEdge(p1, edge) )
00182 addPoint(cpa, count++, p2);
00183 <span class="keywordflow">else</span>
00184 {
00185 addPoint(cpa, count++, intersectEdge(p1, p2, edge));
00186 addPoint(cpa, count++, p2);
00187 }
00188 }
00189 <span class="keywordflow">else</span>
00190 {
00191 <span class="keywordflow">if</span> ( insideEdge(p1, edge) )
00192 addPoint(cpa, count++, intersectEdge(p1, p2, edge));
00193 }
00194 p1 = p2;
00195 }
00196 cpa.resize(count);
00197 }
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:21 2004 for Qwt User's Guide by
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