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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_dial_needle.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_dial_needle.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 <qapplication.h></span><a name="l00012"></a>00012 <span class="preprocessor">#include <qpainter.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00014"></a>00014 <span class="preprocessor">#include "qwt_painter.h"</span><a name="l00015"></a>00015 <span class="preprocessor">#include "qwt_polygon.h"</span><a name="l00016"></a>00016 <span class="preprocessor">#include "qwt_dial_needle.h"</span><a name="l00017"></a>00017 <a name="l00018"></a>00018 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00019"></a>00019 <span class="preprocessor"></span><span class="keyword">typedef</span> QColorGroup QwtPalette;<a name="l00020"></a>00020 <span class="preprocessor">#else</span><a name="l00021"></a>00021 <span class="preprocessor"></span><span class="keyword">typedef</span> QPalette QwtPalette;<a name="l00022"></a>00022 <span class="preprocessor">#endif</span><a name="l00023"></a>00023 <span class="preprocessor"></span><a name="l00025"></a><a class="code" href="class_qwt_dial_needle.html#ef3af79632ce784bc4d7332f6e269a1f">00025</a> <a class="code" href="class_qwt_dial_needle.html#ef3af79632ce784bc4d7332f6e269a1f">QwtDialNeedle::QwtDialNeedle</a>():<a name="l00026"></a>00026 d_palette(QApplication::palette())<a name="l00027"></a>00027 {<a name="l00028"></a>00028 }<a name="l00029"></a>00029 <a name="l00031"></a><a class="code" href="class_qwt_dial_needle.html#c23b2af4af50042967c8cea87b474247">00031</a> <a class="code" href="class_qwt_dial_needle.html#c23b2af4af50042967c8cea87b474247">QwtDialNeedle::~QwtDialNeedle</a>() <a name="l00032"></a>00032 {<a name="l00033"></a>00033 }<a name="l00034"></a>00034 <a name="l00040"></a><a class="code" href="class_qwt_dial_needle.html#e850883a64501136bca64d6ea2d084b9">00040</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_dial_needle.html#e850883a64501136bca64d6ea2d084b9">QwtDialNeedle::setPalette</a>(<span class="keyword">const</span> QPalette &palette) <a name="l00041"></a>00041 { <a name="l00042"></a>00042 d_palette = palette; <a name="l00043"></a>00043 }<a name="l00044"></a>00044 <a name="l00048"></a><a class="code" href="class_qwt_dial_needle.html#8b3c915032389261e07cc983b433166c">00048</a> <span class="keyword">const</span> QPalette &<a class="code" href="class_qwt_dial_needle.html#8b3c915032389261e07cc983b433166c">QwtDialNeedle::palette</a>()<span class="keyword"> const </span><a name="l00049"></a>00049 <span class="keyword"></span>{ <a name="l00050"></a>00050 <span class="keywordflow">return</span> d_palette; <a name="l00051"></a>00051 }<a name="l00052"></a>00052 <a name="l00054"></a><a class="code" href="class_qwt_dial_needle.html#5ff7738a4ce55551b0949a55b145662f">00054</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_dial_needle.html#5ff7738a4ce55551b0949a55b145662f">QwtDialNeedle::drawKnob</a>(QPainter *painter,<a name="l00055"></a>00055 <span class="keyword">const</span> QPoint &pos, <span class="keywordtype">int</span> width, <span class="keyword">const</span> QBrush &brush, <span class="keywordtype">bool</span> sunken)<a name="l00056"></a>00056 {<a name="l00057"></a>00057 painter->save();<a name="l00058"></a>00058 <a name="l00059"></a>00059 QRect rect(0, 0, width, width);<a name="l00060"></a>00060 rect.moveCenter(pos);<a name="l00061"></a>00061 <a name="l00062"></a>00062 painter->setPen(Qt::NoPen);<a name="l00063"></a>00063 painter->setBrush(brush);<a name="l00064"></a>00064 painter->drawEllipse(rect);<a name="l00065"></a>00065 <a name="l00066"></a>00066 painter->setBrush(Qt::NoBrush);<a name="l00067"></a>00067 <a name="l00068"></a>00068 <span class="keyword">const</span> <span class="keywordtype">int</span> colorOffset = 20;<a name="l00069"></a>00069 <a name="l00070"></a>00070 <span class="keywordtype">int</span> startAngle = 45;<a name="l00071"></a>00071 <span class="keywordflow">if</span> ( sunken )<a name="l00072"></a>00072 startAngle += 180;<a name="l00073"></a>00073 <a name="l00074"></a>00074 QPen pen;<a name="l00075"></a>00075 pen.setWidth(1);<a name="l00076"></a>00076 <a name="l00077"></a>00077 pen.setColor(brush.color().dark(100 - colorOffset));<a name="l00078"></a>00078 painter->setPen(pen);<a name="l00079"></a>00079 painter->drawArc(rect, startAngle * 16, 180 * 16);<a name="l00080"></a>00080 <a name="l00081"></a>00081 pen.setColor(brush.color().dark(100 + colorOffset));<a name="l00082"></a>00082 painter->setPen(pen);<a name="l00083"></a>00083 painter->drawArc(rect, (startAngle + 180) * 16, 180 * 16);<a name="l00084"></a>00084 <a name="l00085"></a>00085 painter->restore();<a name="l00086"></a>00086 }<a name="l00087"></a>00087 <a name="l00091"></a><a class="code" href="class_qwt_dial_simple_needle.html#5f16b9298ecd293360a3ccf91d3dbfbb">00091</a> <a class="code" href="class_qwt_dial_simple_needle.html#5f16b9298ecd293360a3ccf91d3dbfbb">QwtDialSimpleNeedle::QwtDialSimpleNeedle</a>(<a class="code" href="class_qwt_dial_simple_needle.html#d28821489e04f1fd942e5bebc8a60584">Style</a> style, <span class="keywordtype">bool</span> hasKnob, <a name="l00092"></a>00092 <span class="keyword">const</span> QColor &mid, <span class="keyword">const</span> QColor &base):<a name="l00093"></a>00093 d_style(style),<a name="l00094"></a>00094 d_hasKnob(hasKnob),<a name="l00095"></a>00095 d_width(-1)<a name="l00096"></a>00096 {<a name="l00097"></a>00097 QPalette <a class="code" href="class_qwt_dial_needle.html#8b3c915032389261e07cc983b433166c">palette</a>;<a name="l00098"></a>00098 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < QPalette::NColorGroups; i++ )<a name="l00099"></a>00099 {<a name="l00100"></a>00100 palette.setColor((QPalette::ColorGroup)i,<a name="l00101"></a>00101 QwtPalette::Mid, mid);<a name="l00102"></a>00102 palette.setColor((QPalette::ColorGroup)i,<a name="l00103"></a>00103 QwtPalette::Base, base);<a name="l00104"></a>00104 }<a name="l00105"></a>00105 <a name="l00106"></a>00106 setPalette(palette);<a name="l00107"></a>00107 }<a name="l00108"></a>00108 <a name="l00110"></a><a class="code" href="class_qwt_dial_simple_needle.html#525658d03e8b7c9a65e6d5c47d1fc1dc">00110</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_dial_simple_needle.html#525658d03e8b7c9a65e6d5c47d1fc1dc">QwtDialSimpleNeedle::setWidth</a>(<span class="keywordtype">int</span> width)<a name="l00111"></a>00111 {<a name="l00112"></a>00112 d_width = width;<a name="l00113"></a>00113 }<a name="l00114"></a>00114 <a name="l00118"></a><a class="code" href="class_qwt_dial_simple_needle.html#8bfc4a0eeeed92f786a9e3880abee34a">00118</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_dial_simple_needle.html#8bfc4a0eeeed92f786a9e3880abee34a">QwtDialSimpleNeedle::width</a>()<span class="keyword"> const</span><a name="l00119"></a>00119 <span class="keyword"></span>{<a name="l00120"></a>00120 <span class="keywordflow">return</span> d_width;<a name="l00121"></a>00121 }<a name="l00122"></a>00122 <a name="l00132"></a><a class="code" href="class_qwt_dial_simple_needle.html#e5b090bd9bbbe0d1a21c02058b8a3539">00132</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_dial_simple_needle.html#e5b090bd9bbbe0d1a21c02058b8a3539">QwtDialSimpleNeedle::draw</a>(QPainter *painter, <span class="keyword">const</span> QPoint &center,<a name="l00133"></a>00133 <span class="keywordtype">int</span> length, <span class="keywordtype">double</span> direction, QPalette::ColorGroup colorGroup)<span class="keyword"> const</span><a name="l00134"></a>00134 <span class="keyword"></span>{<a name="l00135"></a>00135 <span class="keywordflow">if</span> ( d_style == Arrow )<a name="l00136"></a>00136 {<a name="l00137"></a>00137 <a class="code" href="class_qwt_dial_simple_needle.html#d3e9c22e350ccd7aa644297cae7f1d4d">drawArrowNeedle</a>(painter, <a class="code" href="class_qwt_dial_needle.html#8b3c915032389261e07cc983b433166c">palette</a>(), colorGroup,<a name="l00138"></a>00138 center, length, d_width, direction, d_hasKnob);<a name="l00139"></a>00139 }<a name="l00140"></a>00140 <span class="keywordflow">else</span><a name="l00141"></a>00141 {<a name="l00142"></a>00142 <a class="code" href="class_qwt_dial_simple_needle.html#950a42df6b62f7a03af73c2e38850df7">drawRayNeedle</a>(painter, <a class="code" href="class_qwt_dial_needle.html#8b3c915032389261e07cc983b433166c">palette</a>(), colorGroup, <a name="l00143"></a>00143 center, length, d_width, direction, d_hasKnob); <a name="l00144"></a>00144 }<a name="l00145"></a>00145 }<a name="l00146"></a>00146 <a name="l00150"></a><a class="code" href="class_qwt_dial_simple_needle.html#950a42df6b62f7a03af73c2e38850df7">00150</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_dial_simple_needle.html#950a42df6b62f7a03af73c2e38850df7">QwtDialSimpleNeedle::drawRayNeedle</a>(QPainter *painter, <a name="l00151"></a>00151 <span class="keyword">const</span> QPalette &palette, QPalette::ColorGroup colorGroup,<a name="l00152"></a>00152 <span class="keyword">const</span> QPoint &center, <span class="keywordtype">int</span> length, <span class="keywordtype">int</span> width, <span class="keywordtype">double</span> direction, <a name="l00153"></a>00153 <span class="keywordtype">bool</span> hasKnob)<a name="l00154"></a>00154 {<a name="l00155"></a>00155 <span class="keywordflow">if</span> ( width <= 0 )<a name="l00156"></a>00156 width = 5;<a name="l00157"></a>00157 <a name="l00158"></a>00158 direction *= M_PI / 180.0;<a name="l00159"></a>00159 <a name="l00160"></a>00160 painter->save();<a name="l00161"></a>00161 <a name="l00162"></a>00162 <span class="keyword">const</span> QPoint p1(center.x() + 1, center.y() + 2);<a name="l00163"></a>00163 <span class="keyword">const</span> QPoint p2 = qwtPolar2Pos(p1, length, direction);<a name="l00164"></a>00164 <a name="l00165"></a>00165 <span class="keywordflow">if</span> ( width == 1 )<a name="l00166"></a>00166 {<a name="l00167"></a>00167 <span class="keyword">const</span> QColor midColor =<a name="l00168"></a>00168 palette.color(colorGroup, QwtPalette::Mid);<a name="l00169"></a>00169 <a name="l00170"></a>00170 painter->setPen(QPen(midColor, 1));<a name="l00171"></a>00171 painter->drawLine(p1, p2);<a name="l00172"></a>00172 }<a name="l00173"></a>00173 <span class="keywordflow">else</span><a name="l00174"></a>00174 {<a name="l00175"></a>00175 QwtPolygon pa(4);<a name="l00176"></a>00176 pa.setPoint(0, qwtPolar2Pos(p1, width / 2, direction + M_PI_2));<a name="l00177"></a>00177 pa.setPoint(1, qwtPolar2Pos(p2, width / 2, direction + M_PI_2));<a name="l00178"></a>00178 pa.setPoint(2, qwtPolar2Pos(p2, width / 2, direction - M_PI_2));<a name="l00179"></a>00179 pa.setPoint(3, qwtPolar2Pos(p1, width / 2, direction - M_PI_2));<a name="l00180"></a>00180 <a name="l00181"></a>00181 painter->setPen(Qt::NoPen);⌨️ 快捷键说明
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