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<title>Qwt User's Guide: qwt_compass_rose.cpp Source File</title>
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<h1>qwt_compass_rose.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 <math.h></span>
00011 <span class="preprocessor">#include <qpainter.h></span>
00012 <span class="preprocessor">#include "<a class="code" href="qwt__math_8h.html">qwt_math.h</a>"</span>
00013 <span class="preprocessor">#include "qwt_painter.h"</span>
00014 <span class="preprocessor">#include "qwt_compass_rose.h"</span>
00015
00016 <span class="keyword">static</span> QPoint cutPoint(QPoint p11, QPoint p12, QPoint p21, QPoint p22)
00017 {
00018 <span class="keywordtype">double</span> dx1 = p12.x() - p11.x();
00019 <span class="keywordtype">double</span> dy1 = p12.y() - p11.y();
00020 <span class="keywordtype">double</span> dx2 = p22.x() - p21.x();
00021 <span class="keywordtype">double</span> dy2 = p22.y() - p21.y();
00022
00023 <span class="keywordflow">if</span> ( dx1 == 0.0 && dx2 == 0.0 )
00024 <span class="keywordflow">return</span> QPoint();
00025
00026 <span class="keywordflow">if</span> ( dx1 == 0.0 )
00027 {
00028 <span class="keyword">const</span> <span class="keywordtype">double</span> m = dy2 / dx2;
00029 <span class="keyword">const</span> <span class="keywordtype">double</span> t = p21.y() - m * p21.x();
00030 <span class="keywordflow">return</span> QPoint(p11.x(), qwtInt(m * p11.x() + t));
00031 }
00032
00033 <span class="keywordflow">if</span> ( dx2 == 0 )
00034 {
00035 <span class="keyword">const</span> <span class="keywordtype">double</span> m = dy1 / dx1;
00036 <span class="keyword">const</span> <span class="keywordtype">double</span> t = p11.y() - m * p11.x();
00037 <span class="keywordflow">return</span> QPoint(p21.x(), qwtInt(m * p21.x() + t));
00038 }
00039
00040 <span class="keyword">const</span> <span class="keywordtype">double</span> m1 = dy1 / dx1;
00041 <span class="keyword">const</span> <span class="keywordtype">double</span> t1 = p11.y() - m1 * p11.x();
00042
00043 <span class="keyword">const</span> <span class="keywordtype">double</span> m2 = dy2 / dx2;
00044 <span class="keyword">const</span> <span class="keywordtype">double</span> t2 = p21.y() - m2 * p21.x();
00045
00046 <span class="keywordflow">if</span> ( m1 == m2 )
00047 <span class="keywordflow">return</span> QPoint();
00048
00049 <span class="keyword">const</span> <span class="keywordtype">double</span> x = ( t2 - t1 ) / ( m1 - m2 );
00050 <span class="keyword">const</span> <span class="keywordtype">double</span> y = t1 + m1 * x;
00051
00052 <span class="keywordflow">return</span> QPoint(qwtInt(x), qwtInt(y));
00053 }
00054
00055 QwtSimpleCompassRose::QwtSimpleCompassRose(<span class="keywordtype">int</span> numThorns, <span class="keywordtype">int</span> numThornLevels):
00056 d_width(0.2),
00057 d_numThorns(numThorns),
00058 d_numThornLevels(numThornLevels),
00059 d_shrinkFactor(0.9)
00060 {
00061 <span class="keyword">const</span> QColor dark(128,128,255);
00062 <span class="keyword">const</span> QColor light(192,255,255);
00063
00064 QPalette palette;
00065 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < QPalette::NColorGroups; i++ )
00066 {
00067 palette.setColor((QPalette::ColorGroup)i,
00068 QColorGroup::Dark, dark);
00069 palette.setColor((QPalette::ColorGroup)i,
00070 QColorGroup::Light, light);
00071 }
00072
00073 setPalette(palette);
00074 }
00075
00076 <span class="keywordtype">void</span> QwtSimpleCompassRose::draw(QPainter *painter, <span class="keyword">const</span> QPoint &center,
00077 <span class="keywordtype">int</span> radius, <span class="keywordtype">double</span> north, QPalette::ColorGroup cg)<span class="keyword"> const</span>
00078 <span class="keyword"></span>{
00079 QColorGroup colorGroup;
00080 <span class="keywordflow">switch</span>(cg)
00081 {
00082 <span class="keywordflow">case</span> QPalette::Disabled:
00083 colorGroup = palette().disabled();
00084 <span class="keywordflow">case</span> QPalette::Inactive:
00085 colorGroup = palette().inactive();
00086 <span class="keywordflow">default</span>:
00087 colorGroup = palette().active();
00088 }
00089
00090 <a class="code" href="class_qwt_compass.html#b1">drawRose</a>(painter, colorGroup, center, radius, north, d_width,
00091 d_numThorns, d_numThornLevels, d_shrinkFactor);
00092 }
00093
00094 <span class="keywordtype">void</span> QwtSimpleCompassRose::drawRose(
00095 QPainter *painter, <span class="keyword">const</span> QColorGroup &cg,
00096 <span class="keyword">const</span> QPoint &center, <span class="keywordtype">int</span> radius, <span class="keywordtype">double</span> north, <span class="keywordtype">double</span> width,
00097 <span class="keywordtype">int</span> numThorns, <span class="keywordtype">int</span> numThornLevels, <span class="keywordtype">double</span> shrinkFactor)
00098 {
00099 <span class="keywordflow">if</span> ( numThorns < 4 )
00100 numThorns = 4;
00101
00102 <span class="keywordflow">if</span> ( numThorns % 4 )
00103 numThorns += 4 - numThorns % 4;
00104
00105 <span class="keywordflow">if</span> ( numThornLevels <= 0 )
00106 numThornLevels = numThorns / 4;
00107
00108 <span class="keywordflow">if</span> ( shrinkFactor >= 1.0 )
00109 shrinkFactor = 1.0;
00110
00111 <span class="keywordflow">if</span> ( shrinkFactor <= 0.5 )
00112 shrinkFactor = 0.5;
00113
00114 painter->save();
00115
00116 painter->setPen(Qt::NoPen);
00117
00118 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> j = 1; j <= numThornLevels; j++ )
00119 {
00120 <span class="keywordtype">double</span> <a class="code" href="class_qwt_dbl_range.html#a10">step</a> = pow(2.0, j) * M_PI / (<span class="keywordtype">double</span>)numThorns;
00121 <span class="keywordflow">if</span> ( step > M_PI_2 )
00122 <span class="keywordflow">break</span>;
00123
00124 <span class="keywordtype">double</span> r = radius;
00125 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> k = 0; k < 3; k++ )
00126 {
00127 <span class="keywordflow">if</span> ( j + k < numThornLevels )
00128 r *= shrinkFactor;
00129 }
00130
00131 <span class="keywordtype">double</span> leafWidth = r * width;
00132 <span class="keywordflow">if</span> ( 2.0 * M_PI / step > 32 )
00133 leafWidth = 16;
00134
00135 <span class="keyword">const</span> <span class="keywordtype">double</span> <a class="code" href="class_qwt_dial.html#a19">origin</a> = north / 180.0 * M_PI;
00136 <span class="keywordflow">for</span> ( <span class="keywordtype">double</span> angle = origin;
00137 angle < 2.0 * M_PI + origin; angle += step)
00138 {
00139 <span class="keyword">const</span> QPoint p = qwtPolar2Pos(center, r, angle);
00140 QPoint p1 = qwtPolar2Pos(center, leafWidth, angle + M_PI_2);
00141 QPoint p2 = qwtPolar2Pos(center, leafWidth, angle - M_PI_2);
00142
00143 QPointArray pa(3);
00144 pa.setPoint(0, center);
00145 pa.setPoint(1, p);
00146
00147 QPoint p3 = qwtPolar2Pos(center, r, angle + step / 2.0);
00148 p1 = cutPoint(center, p3, p1, p);
00149 pa.setPoint(2, p1);
00150 painter->setBrush(cg.brush(QColorGroup::Dark));
00151 painter->drawPolygon(pa);
00152
00153 QPoint p4 = qwtPolar2Pos(center, r, angle - step / 2.0);
00154 p2 = cutPoint(center, p4, p2, p);
00155
00156 pa.setPoint(2, p2);
00157 painter->setBrush(cg.brush(QColorGroup::Light));
00158 painter->drawPolygon(pa);
00159 }
00160 }
00161 painter->restore();
00162 }
00163
00169 <span class="keywordtype">void</span> QwtSimpleCompassRose::setWidth(<span class="keywordtype">double</span> w)
00170 {
00171 d_width = w;
00172 <span class="keywordflow">if</span> (d_width < 0.03)
00173 d_width = 0.03;
00174
00175 <span class="keywordflow">if</span> (d_width > 0.4)
00176 d_width = 0.4;
00177 }
00178
00179 <span class="keywordtype">void</span> QwtSimpleCompassRose::setNumThorns(<span class="keywordtype">int</span> numThorns)
00180 {
00181 <span class="keywordflow">if</span> ( numThorns < 4 )
00182 numThorns = 4;
00183
00184 <span class="keywordflow">if</span> ( numThorns % 4 )
00185 numThorns += 4 - numThorns % 4;
00186
00187 d_numThorns = numThorns;
00188 }
00189
00190 <span class="keywordtype">int</span> QwtSimpleCompassRose::numThorns()<span class="keyword"> const</span>
00191 <span class="keyword"></span>{
00192 <span class="keywordflow">return</span> d_numThorns;
00193 }
00194
00195 <span class="keywordtype">void</span> QwtSimpleCompassRose::setNumThornLevels(<span class="keywordtype">int</span> numThornLevels)
00196 {
00197 d_numThornLevels = numThornLevels;
00198 }
00199
00200 <span class="keywordtype">int</span> QwtSimpleCompassRose::numThornLevels()<span class="keyword"> const</span>
00201 <span class="keyword"></span>{
00202 <span class="keywordflow">return</span> d_numThornLevels;
00203 }
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 16 21:12:20 2004 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> 1.3.8 </small></address>
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