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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_compass_rose.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_compass_rose.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 <math.h></span><a name="l00011"></a>00011 <span class="preprocessor">#include <qpainter.h></span><a name="l00012"></a>00012 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00013"></a>00013 <span class="preprocessor">#include "qwt_painter.h"</span><a name="l00014"></a>00014 <span class="preprocessor">#include "qwt_compass_rose.h"</span><a name="l00015"></a>00015 <a name="l00016"></a>00016 <span class="keyword">static</span> QPoint cutPoint(QPoint p11, QPoint p12, QPoint p21, QPoint p22)<a name="l00017"></a>00017 {<a name="l00018"></a>00018 <span class="keywordtype">double</span> dx1 = p12.x() - p11.x();<a name="l00019"></a>00019 <span class="keywordtype">double</span> dy1 = p12.y() - p11.y();<a name="l00020"></a>00020 <span class="keywordtype">double</span> dx2 = p22.x() - p21.x();<a name="l00021"></a>00021 <span class="keywordtype">double</span> dy2 = p22.y() - p21.y();<a name="l00022"></a>00022 <a name="l00023"></a>00023 <span class="keywordflow">if</span> ( dx1 == 0.0 && dx2 == 0.0 )<a name="l00024"></a>00024 <span class="keywordflow">return</span> QPoint();<a name="l00025"></a>00025 <a name="l00026"></a>00026 <span class="keywordflow">if</span> ( dx1 == 0.0 )<a name="l00027"></a>00027 {<a name="l00028"></a>00028 <span class="keyword">const</span> <span class="keywordtype">double</span> m = dy2 / dx2;<a name="l00029"></a>00029 <span class="keyword">const</span> <span class="keywordtype">double</span> t = p21.y() - m * p21.x();<a name="l00030"></a>00030 <span class="keywordflow">return</span> QPoint(p11.x(), qRound(m * p11.x() + t));<a name="l00031"></a>00031 }<a name="l00032"></a>00032 <a name="l00033"></a>00033 <span class="keywordflow">if</span> ( dx2 == 0 )<a name="l00034"></a>00034 {<a name="l00035"></a>00035 <span class="keyword">const</span> <span class="keywordtype">double</span> m = dy1 / dx1;<a name="l00036"></a>00036 <span class="keyword">const</span> <span class="keywordtype">double</span> t = p11.y() - m * p11.x();<a name="l00037"></a>00037 <span class="keywordflow">return</span> QPoint(p21.x(), qRound(m * p21.x() + t));<a name="l00038"></a>00038 }<a name="l00039"></a>00039 <a name="l00040"></a>00040 <span class="keyword">const</span> <span class="keywordtype">double</span> m1 = dy1 / dx1;<a name="l00041"></a>00041 <span class="keyword">const</span> <span class="keywordtype">double</span> t1 = p11.y() - m1 * p11.x();<a name="l00042"></a>00042 <a name="l00043"></a>00043 <span class="keyword">const</span> <span class="keywordtype">double</span> m2 = dy2 / dx2;<a name="l00044"></a>00044 <span class="keyword">const</span> <span class="keywordtype">double</span> t2 = p21.y() - m2 * p21.x();<a name="l00045"></a>00045 <a name="l00046"></a>00046 <span class="keywordflow">if</span> ( m1 == m2 )<a name="l00047"></a>00047 <span class="keywordflow">return</span> QPoint();<a name="l00048"></a>00048 <a name="l00049"></a>00049 <span class="keyword">const</span> <span class="keywordtype">double</span> x = ( t2 - t1 ) / ( m1 - m2 );<a name="l00050"></a>00050 <span class="keyword">const</span> <span class="keywordtype">double</span> y = t1 + m1 * x;<a name="l00051"></a>00051 <a name="l00052"></a>00052 <span class="keywordflow">return</span> QPoint(qRound(x), qRound(y));<a name="l00053"></a>00053 }<a name="l00054"></a>00054 <a name="l00061"></a><a class="code" href="class_qwt_simple_compass_rose.html#66cc98efe5717eaf11fb0e713cd1aa21">00061</a> <a class="code" href="class_qwt_simple_compass_rose.html#66cc98efe5717eaf11fb0e713cd1aa21">QwtSimpleCompassRose::QwtSimpleCompassRose</a>(<span class="keywordtype">int</span> numThorns, <span class="keywordtype">int</span> numThornLevels):<a name="l00062"></a>00062 d_width(0.2),<a name="l00063"></a>00063 d_numThorns(numThorns),<a name="l00064"></a>00064 d_numThornLevels(numThornLevels),<a name="l00065"></a>00065 d_shrinkFactor(0.9)<a name="l00066"></a>00066 {<a name="l00067"></a>00067 <span class="keyword">const</span> QColor dark(128,128,255);<a name="l00068"></a>00068 <span class="keyword">const</span> QColor light(192,255,255);<a name="l00069"></a>00069 <a name="l00070"></a>00070 QPalette <a class="code" href="class_qwt_compass_rose.html#b2e5c2a4a27c40a175458b96d89394e8">palette</a>;<a name="l00071"></a>00071 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < QPalette::NColorGroups; i++ )<a name="l00072"></a>00072 {<a name="l00073"></a>00073 #<span class="keywordflow">if</span> QT_VERSION < 0x040000<a name="l00074"></a>00074 palette.setColor((QPalette::ColorGroup)i,<a name="l00075"></a>00075 QColorGroup::Dark, dark);<a name="l00076"></a>00076 palette.setColor((QPalette::ColorGroup)i,<a name="l00077"></a>00077 QColorGroup::Light, light);<a name="l00078"></a>00078 <span class="preprocessor">#else</span><a name="l00079"></a>00079 <span class="preprocessor"></span> palette.setColor((QPalette::ColorGroup)i,<a name="l00080"></a>00080 QPalette::Dark, dark);<a name="l00081"></a>00081 palette.setColor((QPalette::ColorGroup)i,<a name="l00082"></a>00082 QPalette::Light, light);<a name="l00083"></a>00083 <span class="preprocessor">#endif</span><a name="l00084"></a>00084 <span class="preprocessor"></span> }<a name="l00085"></a>00085 <a name="l00086"></a>00086 setPalette(palette);<a name="l00087"></a>00087 }<a name="l00088"></a>00088 <a name="l00098"></a><a class="code" href="class_qwt_simple_compass_rose.html#6208b684cba67d64f4c4717b69cb9146">00098</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_simple_compass_rose.html#6208b684cba67d64f4c4717b69cb9146">QwtSimpleCompassRose::draw</a>(QPainter *painter, <span class="keyword">const</span> QPoint &center, <a name="l00099"></a>00099 <span class="keywordtype">int</span> radius, <span class="keywordtype">double</span> north, QPalette::ColorGroup cg)<span class="keyword"> const</span><a name="l00100"></a>00100 <span class="keyword"></span>{<a name="l00101"></a>00101 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00102"></a>00102 <span class="preprocessor"></span> QColorGroup colorGroup;<a name="l00103"></a>00103 <span class="keywordflow">switch</span>(cg)<a name="l00104"></a>00104 {<a name="l00105"></a>00105 <span class="keywordflow">case</span> QPalette::Disabled:<a name="l00106"></a>00106 colorGroup = <a class="code" href="class_qwt_compass_rose.html#b2e5c2a4a27c40a175458b96d89394e8">palette</a>().disabled();<a name="l00107"></a>00107 <span class="keywordflow">case</span> QPalette::Inactive:<a name="l00108"></a>00108 colorGroup = <a class="code" href="class_qwt_compass_rose.html#b2e5c2a4a27c40a175458b96d89394e8">palette</a>().inactive();<a name="l00109"></a>00109 <span class="keywordflow">default</span>:<a name="l00110"></a>00110 colorGroup = <a class="code" href="class_qwt_compass_rose.html#b2e5c2a4a27c40a175458b96d89394e8">palette</a>().active();<a name="l00111"></a>00111 }<a name="l00112"></a>00112 <a name="l00113"></a>00113 <a class="code" href="class_qwt_simple_compass_rose.html#22fec9f17882f4a9e5069e08a2007cd0">drawRose</a>(painter, colorGroup, center, radius, north, d_width, <a name="l00114"></a>00114 d_numThorns, d_numThornLevels, d_shrinkFactor);<a name="l00115"></a>00115 <span class="preprocessor">#else</span><a name="l00116"></a>00116 <span class="preprocessor"></span> QPalette pal = <a class="code" href="class_qwt_compass_rose.html#b2e5c2a4a27c40a175458b96d89394e8">palette</a>();<a name="l00117"></a>00117 pal.setCurrentColorGroup(cg);<a name="l00118"></a>00118 <a class="code" href="class_qwt_simple_compass_rose.html#22fec9f17882f4a9e5069e08a2007cd0">drawRose</a>(painter, pal, center, radius, north, d_width, <a name="l00119"></a>00119 d_numThorns, d_numThornLevels, d_shrinkFactor);<a name="l00120"></a>00120 <span class="preprocessor">#endif</span><a name="l00121"></a>00121 <span class="preprocessor"></span>}<a name="l00122"></a>00122 <a name="l00136"></a><a class="code" href="class_qwt_simple_compass_rose.html#22fec9f17882f4a9e5069e08a2007cd0">00136</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_simple_compass_rose.html#22fec9f17882f4a9e5069e08a2007cd0">QwtSimpleCompassRose::drawRose</a>(<a name="l00137"></a>00137 QPainter *painter, ⌨️ 快捷键说明
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