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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_layout_metrics.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_layout_metrics.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 <qapplication.h></span><a name="l00011"></a>00011 <span class="preprocessor">#include <qpainter.h></span><a name="l00012"></a>00012 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#include <qpaintdevicemetrics.h></span> <a name="l00014"></a>00014 <span class="preprocessor">#include <qwmatrix.h></span> <a name="l00015"></a>00015 <span class="preprocessor">#define QwtMatrix QWMatrix</span><a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor">#else</span><a name="l00017"></a>00017 <span class="preprocessor"></span><span class="preprocessor">#include <qmatrix.h></span> <a name="l00018"></a>00018 <span class="preprocessor">#define QwtMatrix QMatrix</span><a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#include <qpaintdevice.h></span> <a name="l00021"></a>00021 <span class="preprocessor">#include <qdesktopwidget.h></span> <a name="l00022"></a>00022 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00023"></a>00023 <span class="preprocessor">#include "qwt_polygon.h"</span><a name="l00024"></a>00024 <span class="preprocessor">#include "qwt_layout_metrics.h"</span><a name="l00025"></a>00025 <a name="l00026"></a>00026 <span class="keyword">static</span> QSize deviceDpi(<span class="keyword">const</span> QPaintDevice *device)<a name="l00027"></a>00027 {<a name="l00028"></a>00028 QSize dpi;<a name="l00029"></a>00029 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00030"></a>00030 <span class="preprocessor"></span> <span class="keyword">const</span> QPaintDeviceMetrics metrics(device);<a name="l00031"></a>00031 dpi.setWidth(metrics.logicalDpiX());<a name="l00032"></a>00032 dpi.setHeight(metrics.logicalDpiY());<a name="l00033"></a>00033 <span class="preprocessor">#else</span><a name="l00034"></a>00034 <span class="preprocessor"></span> dpi.setWidth(device->logicalDpiX());<a name="l00035"></a>00035 dpi.setHeight(device->logicalDpiY());<a name="l00036"></a>00036 <span class="preprocessor">#endif</span><a name="l00037"></a>00037 <span class="preprocessor"></span><a name="l00038"></a>00038 <span class="keywordflow">return</span> dpi;<a name="l00039"></a>00039 }<a name="l00040"></a>00040 <a name="l00041"></a>00041 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00042"></a>00042 <span class="preprocessor"></span><a name="l00043"></a>00043 <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keyword">const</span> QWMatrix &matrix(<span class="keyword">const</span> QPainter *painter)<a name="l00044"></a>00044 {<a name="l00045"></a>00045 <span class="keywordflow">return</span> painter->worldMatrix();<a name="l00046"></a>00046 }<a name="l00047"></a>00047 <span class="keyword">inline</span> <span class="keyword">static</span> QWMatrix invMatrix(<span class="keyword">const</span> QPainter *painter)<a name="l00048"></a>00048 {<a name="l00049"></a>00049 <span class="keywordflow">return</span> painter->worldMatrix().invert();<a name="l00050"></a>00050 }<a name="l00051"></a>00051 <a name="l00052"></a>00052 <span class="preprocessor">#else // QT_VERSION >= 0x040000</span><a name="l00053"></a>00053 <span class="preprocessor"></span><a name="l00054"></a>00054 <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keyword">const</span> QMatrix &matrix(<span class="keyword">const</span> QPainter *painter)<a name="l00055"></a>00055 {<a name="l00056"></a>00056 <span class="keywordflow">return</span> painter->matrix();<a name="l00057"></a>00057 }<a name="l00058"></a>00058 <span class="keyword">inline</span> <span class="keyword">static</span> QMatrix invMatrix(<span class="keyword">const</span> QPainter *painter)<a name="l00059"></a>00059 {<a name="l00060"></a>00060 <span class="keywordflow">return</span> painter->matrix().inverted();<a name="l00061"></a>00061 }<a name="l00062"></a>00062 <a name="l00063"></a>00063 <span class="preprocessor">#endif</span><a name="l00064"></a>00064 <span class="preprocessor"></span><a name="l00065"></a><a class="code" href="class_qwt_metrics_map.html#4f3938efa354940cf3e505265ef95352">00065</a> <a class="code" href="class_qwt_metrics_map.html#4f3938efa354940cf3e505265ef95352">QwtMetricsMap::QwtMetricsMap</a>()<a name="l00066"></a>00066 {<a name="l00067"></a>00067 d_screenToLayoutX = d_screenToLayoutY = <a name="l00068"></a>00068 d_deviceToLayoutX = d_deviceToLayoutY = 1.0;<a name="l00069"></a>00069 }<a name="l00070"></a>00070 <a name="l00071"></a><a class="code" href="class_qwt_metrics_map.html#5890baf34ffa9e2bcd18f5e559821ad0">00071</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_metrics_map.html#5890baf34ffa9e2bcd18f5e559821ad0">QwtMetricsMap::setMetrics</a>(<span class="keyword">const</span> QPaintDevice *layoutDevice, <a name="l00072"></a>00072 <span class="keyword">const</span> QPaintDevice *paintDevice)<a name="l00073"></a>00073 {<a name="l00074"></a>00074 <span class="keyword">const</span> QSize screenDpi = deviceDpi(QApplication::desktop());<a name="l00075"></a>00075 <span class="keyword">const</span> QSize layoutDpi = deviceDpi(layoutDevice);<a name="l00076"></a>00076 <span class="keyword">const</span> QSize paintDpi = deviceDpi(paintDevice);<a name="l00077"></a>00077 <a name="l00078"></a>00078 d_screenToLayoutX = double(layoutDpi.width()) / <a name="l00079"></a>00079 <span class="keywordtype">double</span>(screenDpi.width());<a name="l00080"></a>00080 d_screenToLayoutY = double(layoutDpi.height()) / <a name="l00081"></a>00081 <span class="keywordtype">double</span>(screenDpi.height());<a name="l00082"></a>00082 <a name="l00083"></a>00083 d_deviceToLayoutX = double(layoutDpi.width()) / <a name="l00084"></a>00084 <span class="keywordtype">double</span>(paintDpi.width());<a name="l00085"></a>00085 d_deviceToLayoutY = double(layoutDpi.height()) / <a name="l00086"></a>00086 <span class="keywordtype">double</span>(paintDpi.height());<a name="l00087"></a>00087 }<a name="l00088"></a>00088 <a name="l00089"></a>00089 <span class="preprocessor">#ifndef QT_NO_TRANSFORMATIONS</span><a name="l00090"></a><a class="code" href="class_qwt_metrics_map.html#180736dad3afe26c2579f6fefcb9f2d9">00090</a> <span class="preprocessor"></span>QPoint <a class="code" href="class_qwt_metrics_map.html#180736dad3afe26c2579f6fefcb9f2d9">QwtMetricsMap::layoutToDevice</a>(<span class="keyword">const</span> QPoint &point, <a name="l00091"></a>00091 <span class="keyword">const</span> QPainter *painter) <span class="keyword">const</span><a name="l00092"></a>00092 <span class="preprocessor">#else</span><a name="l00093"></a>00093 <span class="preprocessor"></span>QPoint <a class="code" href="class_qwt_metrics_map.html#180736dad3afe26c2579f6fefcb9f2d9">QwtMetricsMap::layoutToDevice</a>(<span class="keyword">const</span> QPoint &point, <a name="l00094"></a>00094 <span class="keyword">const</span> QPainter *) const<a name="l00095"></a>00095 <span class="preprocessor">#endif</span><a name="l00096"></a>00096 <span class="preprocessor"></span>{<a name="l00097"></a>00097 <span class="keywordflow">if</span> ( isIdentity() )<a name="l00098"></a>00098 <span class="keywordflow">return</span> point;<a name="l00099"></a>00099 <a name="l00100"></a>00100 QPoint mappedPoint(point);<a name="l00101"></a>00101 <a name="l00102"></a>00102 <span class="preprocessor">#ifndef QT_NO_TRANSFORMATIONS</span><a name="l00103"></a>00103 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( painter )<a name="l00104"></a>00104 mappedPoint = matrix(painter).map(mappedPoint);<a name="l00105"></a>00105 <span class="preprocessor">#endif</span><a name="l00106"></a>00106 <span class="preprocessor"></span><a name="l00107"></a>00107 mappedPoint.setX(layoutToDeviceX(mappedPoint.x()));<a name="l00108"></a>00108 mappedPoint.setY(layoutToDeviceY(mappedPoint.y()));<a name="l00109"></a>00109 <a name="l00110"></a>00110 <span class="preprocessor">#ifndef QT_NO_TRANSFORMATIONS</span><a name="l00111"></a>00111 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( painter )<a name="l00112"></a>00112 mappedPoint = invMatrix(painter).map(mappedPoint);<a name="l00113"></a>00113 <span class="preprocessor">#endif</span><a name="l00114"></a>00114 <span class="preprocessor"></span><a name="l00115"></a>00115 <span class="keywordflow">return</span> mappedPoint;<a name="l00116"></a>00116 }<a name="l00117"></a>00117 <a name="l00118"></a>00118 <span class="preprocessor">#ifndef QT_NO_TRANSFORMATIONS</span><a name="l00119"></a><a class="code" href="class_qwt_metrics_map.html#1d260ed12860d2f467c82f3d0cffd7f1">00119</a> <span class="preprocessor"></span>QPoint <a class="code" href="class_qwt_metrics_map.html#1d260ed12860d2f467c82f3d0cffd7f1">QwtMetricsMap::deviceToLayout</a>(<span class="keyword">const</span> QPoint &point, <a name="l00120"></a>00120 <span class="keyword">const</span> QPainter *painter) <span class="keyword">const</span><a name="l00121"></a>00121 <span class="preprocessor">#else</span><a name="l00122"></a>00122 <span class="preprocessor"></span>QPoint <a class="code" href="class_qwt_metrics_map.html#1d260ed12860d2f467c82f3d0cffd7f1">QwtMetricsMap::deviceToLayout</a>(<span class="keyword">const</span> QPoint &point, <a name="l00123"></a>00123 <span class="keyword">const</span> QPainter *) const<a name="l00124"></a>00124 <span class="preprocessor">#endif</span><a name="l00125"></a>00125 <span class="preprocessor"></span>{<a name="l00126"></a>00126 <span class="keywordflow">if</span> ( isIdentity() )<a name="l00127"></a>00127 <span class="keywordflow">return</span> point;<a name="l00128"></a>00128 <a name="l00129"></a>00129 QPoint mappedPoint(point);<a name="l00130"></a>00130 <a name="l00131"></a>00131 <span class="preprocessor">#ifndef QT_NO_TRANSFORMATIONS</span><a name="l00132"></a>00132 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( painter )<a name="l00133"></a>00133 mappedPoint = matrix(painter).map(mappedPoint);<a name="l00134"></a>00134 <span class="preprocessor">#endif</span><a name="l00135"></a>00135 <span class="preprocessor"></span><a name="l00136"></a>00136 mappedPoint.setX(deviceToLayoutX(mappedPoint.x()));<a name="l00137"></a>00137 mappedPoint.setY(deviceToLayoutY(mappedPoint.y()));<a name="l00138"></a>00138 <a name="l00139"></a>00139 <span class="preprocessor">#ifndef QT_NO_TRANSFORMATIONS</span><a name="l00140"></a>00140 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( painter )<a name="l00141"></a>00141 mappedPoint = invMatrix(painter).map(mappedPoint);<a name="l00142"></a>00142 <span class="preprocessor">#endif</span><a name="l00143"></a>00143 <span class="preprocessor"></span><a name="l00144"></a>00144 <span class="keywordflow">return</span> mappedPoint;<a name="l00145"></a>00145 }<a name="l00146"></a>00146 <a name="l00147"></a><a class="code" href="class_qwt_metrics_map.html#3b2300920bf39300b0b5c969e296f5e1">00147</a> QPoint <a class="code" href="class_qwt_metrics_map.html#3b2300920bf39300b0b5c969e296f5e1">QwtMetricsMap::screenToLayout</a>(<span class="keyword">const</span> QPoint &point)<span class="keyword"> const</span><a name="l00148"></a>00148 <span class="keyword"></span>{<a name="l00149"></a>00149 <span class="keywordflow">if</span> ( d_screenToLayoutX == 1.0 && d_screenToLayoutY == 1.0 )<a name="l00150"></a>00150 <span class="keywordflow">return</span> point;<a name="l00151"></a>00151 <a name="l00152"></a>00152 <span class="keywordflow">return</span> QPoint(<a class="code" href="class_qwt_metrics_map.html#e1cce24cb234af56b3e52bfad1d153ac">screenToLayoutX</a>(point.x()), <a class="code" href="class_qwt_metrics_map.html#8965c1ac879173a2dcc609f4ed911a8e">screenToLayoutY</a>(point.y()));<a name="l00153"></a>00153 }<a name="l00154"></a>00154 ⌨️ 快捷键说明
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