366 lines
27 KiB
HTML
366 lines
27 KiB
HTML
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Formatting the plot</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch21.html" title="Chapter 21. Windrose"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Formatting the plot</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 21. Windrose</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Formatting the plot"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2588129"></a>Formatting the plot</h2></div></div></div>
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<div class="sect2" title="Positioning the plot"><div class="titlepage"><div><div><h3 class="title"><a name="id2588150"></a>Positioning the plot</h3></div></div></div>
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<p>The position of the graph can be controlled with the method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetPos($aXPos,$aYPos)</code></p>
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</li></ul></div><p>
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</p>
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<p>The position can be specified as either absolute position (in pixels) or as a
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fraction of width and height. The anchor for the position is the center of the
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windrose plot. For example, the following line centers the plot in the graph </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$windplot->SetPos(0.5,0.5);</span></pre></td></tr></table></div><p>
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</p>
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</div>
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<div class="sect2" title="Specifying the size of the plot"><div class="titlepage"><div><div><h3 class="title"><a name="id2588191"></a>Specifying the size of the plot</h3></div></div></div>
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<p>In the same way as for the position the size of the windrose plot can be specified
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as either an absolute value or as a fraction of the minimum of width and height. The
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size specified refers to the diameter of the plot. </p>
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<p>The size is controlled with the the method</p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetSize($aDiameter)</code>
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</p>
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</li></ul></div><p>
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</p>
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<p>as in </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$windplot->SetSize(200);</span></pre></td></tr></table></div><p>
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</p>
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<p>The code above sets the diameter of the plot to 200 pixels, setting the value to
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0.7 would set the diameter to 0.7 * min(WIDTH,HEIGHT) where width and height are the
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size of the graph.</p>
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</div>
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<div class="sect2" title="Specifying the size of the Zero-circle (middle circle)"><div class="titlepage"><div><div><h3 class="title"><a name="id2588242"></a>Specifying the size of the Zero-circle (middle circle)</h3></div></div></div>
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<p>The size of the middle circle (the zero-range circle) can be adjusted with the
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method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetZCircleSize($aDiameter)</code>
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</p>
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<p><code class="code">$aDiameter</code>, The diameter can be specified as either an
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absolute integer value or as a fraction of the windrose plot diameter.
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</p>
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</li></ul></div><p>
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</p>
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<p>For example the following line sets the size to 1/3 of the windrose plot. </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$windplot->SetZCircleSize(1/3);</span></pre></td></tr></table></div><p>
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</p>
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</div>
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<div class="sect2" title="Formatting the plot legend"><div class="titlepage"><div><div><h3 class="title"><a name="id2588292"></a>Formatting the plot legend</h3></div></div></div>
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<p>The legend is displayed in a fixed position just below the windrose plot as can be
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seen in all the previous examples.</p>
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<p>All legend methods is accessed through the legend property of the windrose plot as
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in </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$windroseplot->legend->SetFont(...);</span></pre></td></tr></table></div><p>
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</p>
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<p>There are four basic attributes that can be customizable for the legend as
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described in the following paragraphs. </p>
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<div class="sect3" title="Specifying legend fonts"><div class="titlepage"><div><div><h4 class="title"><a name="id2588312"></a>Specifying legend fonts</h4></div></div></div>
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<p>To allow for maximum flexibility font can be specified for both the numerical
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ranges as well as for the text under the legend. In order to avoid making the
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legend to wide it is often desirable to use a smaller font for the ranges and a
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slightly larger font for the actual text under the legend (as well as inside the
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"calm" circle - the indicator for bucket 0). </p>
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<p>The fonts for the legend is adjusted by the following methods</p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">SetTFont()</code>, The text below the legend</p>
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</li><li class="listitem">
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<p><code class="code">SetLFont()</code>, The font for the labels</p>
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</li><li class="listitem">
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<p><code class="code">SetCFont()</code>, The font for the label inside the "calm"
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circle</p>
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</li><li class="listitem">
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<p><code class="code">SetFont()</code>, Sets all the font areas above the same
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font. Note that if this method is called after one of the individual
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settings previous specified (e.g. <code class="code">SetCFont()</code>) they will
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be overwritten.</p>
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</li></ul></div><p>
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</p>
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<p>The colors for the fonts are specified in an analogue way by using the methods </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">SetTFontColor()</code></p>
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</li><li class="listitem">
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<p><code class="code">SetLFontColor()</code></p>
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</li><li class="listitem">
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<p><code class="code">SetCFontColor()</code></p>
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</li><li class="listitem">
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<p><code class="code">SetFontColor()</code></p>
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</li></ul></div><p>
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</p>
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<p><a class="xref" href="ch21s03.html#fig.windrose-legend-methods" title="Figure 21.10. Windrose legend methods">Figure 21.10. Windrose legend methods</a> explains visually how these
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methods are applied</p>
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<div class="figure"><a name="fig.windrose-legend-methods"></a><p class="title"><b>Figure 21.10. Windrose legend methods</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/wind-legend-methods.png" alt="Windrose legend methods"></div>
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</div></div><br class="figure-break">
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<p><a class="xref" href="ch21s03.html#fig.windrose_ex6.1" title="Figure 21.11. Using chinese fonts (windrose_ex6.1.php)">Figure 21.11. Using chinese fonts <code class="uri"><a class="uri" href="example_src/windrose_ex6.1.html" target="_top">(<code class="filename">windrose_ex6.1.php</code>)</a></code> </a> illustrates how two fonts were used
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for the legend. For the circle we have use a Chinese font (The Kanji characters
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roughly means "Chinese language")</p>
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<p>
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</p><div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Caution</h3>
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<p>The source file (as every source file in the library) is encoded in
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utf-8. For technical reasons some browsers might not render the Chinese
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characters correctly when the source file is viewed.</p>
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</div><p>
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</p>
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<p>
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</p><div class="figure"><a name="fig.windrose_ex6.1"></a><p class="title"><b>Figure 21.11. Using chinese fonts <code class="uri"><a class="uri" href="example_src/windrose_ex6.1.html" target="_top">(<code class="filename">windrose_ex6.1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/windrose_ex6.1.png" alt="Using chinese fonts (windrose_ex6.1.php)"></span> </div></div><p><br class="figure-break">
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</p>
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</div>
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<div class="sect3" title="Setting text and colors for the Zero-circle"><div class="titlepage"><div><div><h4 class="title"><a name="id2588533"></a>Setting text and colors for the Zero-circle</h4></div></div></div>
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<p>The "Calm" circle can have it's size, line weight and color adjusted. In
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addition (as was shown in <a class="xref" href="ch21s03.html#fig.windrose_ex6.1" title="Figure 21.11. Using chinese fonts (windrose_ex6.1.php)">Figure 21.11. Using chinese fonts <code class="uri"><a class="uri" href="example_src/windrose_ex6.1.html" target="_top">(<code class="filename">windrose_ex6.1.php</code>)</a></code> </a>) specify any
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text within the circle. By default the text "Calm" is printed inside the circle.
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The following methods are used to adjust these properties. </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">SetCircleWeight($aWeight)</code></p>
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</li><li class="listitem">
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<p><code class="code">SetCircleRadius($aRadius)</code></p>
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</li><li class="listitem">
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<p><code class="code">SetCircleColor($aColor)</code></p>
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</li><li class="listitem">
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<p><code class="code">SetCircleText($aTxt)</code></p>
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</li></ul></div><p>
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</p>
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</div>
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<div class="sect3" title="Specifying number formats for ranges"><div class="titlepage"><div><div><h4 class="title"><a name="id2588593"></a>Specifying number formats for ranges</h4></div></div></div>
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<p>For the ranges it is possible to adjust how the numbers are formatted with a
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general format string (in the style of a <code class="code">printf()</code> format string).
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This would allow, for example, to choose the number of decimal values to show in
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the legend. The format string is specified with a call to </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">Legend::SetFormat($aFmt)</code>. </p>
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<p>The format will be applied to both the lower and upper range
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value. This means that the actual legend range text in the legend
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will be printed as [number format]-[number format]. </p>
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</li></ul></div><p>
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</p>
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<p>The following example shows how to make sure the ranges are displayed as
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integers</p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$wp->legend->SetFormat('%d');</span></pre></td></tr></table></div><p>
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</p>
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</div>
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<div class="sect3" title="Specifying legend bottom text"><div class="titlepage"><div><div><h4 class="title"><a name="id2588652"></a>Specifying legend bottom text</h4></div></div></div>
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<p>Finally it is also possible to specify a text at the bottom of the legend with
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a call to </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">Legend::SetText($aTxt)</code>. The text will be displayed
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just underneath the legend as for example, shown in <a class="xref" href="ch21s03.html#fig.windrose_ex6.1" title="Figure 21.11. Using chinese fonts (windrose_ex6.1.php)">Figure 21.11. Using chinese fonts <code class="uri"><a class="uri" href="example_src/windrose_ex6.1.html" target="_top">(<code class="filename">windrose_ex6.1.php</code>)</a></code> </a>
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</p>
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</li></ul></div><p>
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</p>
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</div>
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<div class="sect3" title="Specifying the numeric values displayed for the ranges"><div class="titlepage"><div><div><h4 class="title"><a name="id2588694"></a>Specifying the numeric values displayed for the ranges</h4></div></div></div>
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<p>The values displayed in the legend for the ranges can be adjusted with a call
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to </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindRosePlot::SetRanges($aRanges)</code>. By default the
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ranges are set to 0,1,2,3,5,6,10,13.5,99.0, this means that the
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ranges printed will be 1-2, 2-3, 3-5, .... </p>
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</li></ul></div><p>
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</p>
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<p>The following example shows how to change this to the ranges 0.000-0.001,
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0.001-0.003, 0.003-0.005 </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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2
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$windplot->SetRanges(array(0.001,0.003,0.005));
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$windplot->SetFormat('%.3f');</span></pre></td></tr></table></div><p>
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</p>
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<p>As can be seen the first range (bucket 0) is not really directly printed. It
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is by default indicated by the circle to the left in the legend.</p>
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<p>In the example lines above we also changed the format to display the decimals.
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Without this the default is only to show one decimal and that would show all
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ranges as 0.0. An example of how this might look can be seen in figure 10 below.
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</p>
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</div>
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</div>
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<div class="sect2" title="Adjusting the grid colors"><div class="titlepage"><div><div><h3 class="title"><a name="id2588295"></a>Adjusting the grid colors</h3></div></div></div>
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<p>The colors of both the radial grid and the circular grid can be adjusted. This is
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done with the method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetGridColor($aColor1,$aColor2)</code>
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</p>
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</li></ul></div><p>
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</p>
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<p>The first argument specifies the grid circle color and the second argument
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specifies the radial grid colors. </p>
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</div>
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<div class="sect2" title="Adjusting the weight of the grid circles"><div class="titlepage"><div><div><h3 class="title"><a name="id2588776"></a>Adjusting the weight of the grid circles</h3></div></div></div>
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<p>To adjust the weight (thickness) of the grid lines (both circle and radial lines)
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the following method is used</p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetGridWeight($aWeight1,$aWeight2)</code></p>
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<p>The first argument specifies the weight of the circle and the second
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the weight of the radial lines.</p>
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</li></ul></div><p>
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</p>
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<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
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<p>It is possible to have individual colors of the radial grid lines (and line
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style &weight) by using any of the methods </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">SetRadialColors()</code></p>
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</li><li class="listitem">
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<p><code class="code">SetRadialStyles()</code>
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</p>
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</li><li class="listitem">
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<p><code class="code">SetRadialWeight()</code></p>
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</li></ul></div><p>
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</p>
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</div>
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<p>
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</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
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<p>Due to technical and performance limitations circle weight can only be
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specified in the range [1,3] (inclusively).</p>
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</div><p>
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</p>
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</div>
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<div class="sect2" title="Adding a box around the plot"><div class="titlepage"><div><div><h3 class="title"><a name="id2588868"></a>Adding a box around the plot</h3></div></div></div>
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<p>Finally we remember that it is possible to add a rectangular box around the plot
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by using the method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetBox($aColor='black', $aWeight=1,
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$aStyle='solid', $aShow=true)</code></p>
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</li></ul></div><p>
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</p>
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<p>an example of this can be seen in <a class="xref" href="ch21s02.html#fig.windrose_2plots_ex1" title="Figure 21.7. Adding two windrose plots to the same graph (windrose_2plots_ex1.php)">Figure 21.7. Adding two windrose plots to the same graph <code class="uri"><a class="uri" href="example_src/windrose_2plots_ex1.html" target="_top">(<code class="filename">windrose_2plots_ex1.php</code>)</a></code> </a>.</p>
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</div>
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<div class="sect2" title="Adjusting the size of the center zero circle"><div class="titlepage"><div><div><h3 class="title"><a name="id2588901"></a>Adjusting the size of the center zero circle</h3></div></div></div>
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<p>The size of the center circle can be manually adjusted as either specified in
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absolute number of pixels or as fractions of the windrose plot (not the entire
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windrose graph). This is done with the method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetZCircleSize($aSize)</code></p>
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</li></ul></div><p>
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</p>
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</div>
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<div class="sect2" title="Localizing the default names for the compass directions"><div class="titlepage"><div><div><h3 class="title"><a name="sec.windrose-locale-compass"></a>Localizing the default names for the compass directions</h3></div></div></div>
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<p>By default the compass cardinal directions are presented in English locale using
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standard denominations for the 16 compass directions. </p>
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<p>Localizing these names are done with a call to the method </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p><code class="code">WindrosePlot::SetCompassLabels($aLabels)</code></p>
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</li></ul></div><p>
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</p>
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<p>The order of the names for the directions should start with the corresponding name
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for "East" and then continue counter-clockwise all the way to "East North East".
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Adjusting the names for the compass directions means two things: </p>
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<p>
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</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
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<p>If there is named direction in the data (as key) that key must now
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also be in localized form.</p>
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</li><li class="listitem">
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<p>The displayed names for the compass direction will be shown in
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localized form.</p>
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</li></ul></div><p>
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</p>
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<p>For example, the code snippet below shows how to localize the compass directions
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into Swedish. </p>
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<p>
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</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
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2
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3
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9
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10
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</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">...
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$data = array(
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'sso' => array(12,8,2,3),
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6 => array(5,4,4,5,4),
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);
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$se_CompassLbl =
|
||
array('O','ONO','NO','NNO','N','NNV','NV','VNV','V','VSV','SV','SSV','S','SSO','SO','OSO');
|
||
....
|
||
$windroseplot->SetCompassLabels($se_CompassLbl);
|
||
...</span></pre></td></tr></table></div><p>
|
||
</p>
|
||
<p>and the following shows how to make a localization into Japanese</p>
|
||
<p>
|
||
</p><div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Caution</h3>
|
||
<p>The source file (as every source file in the library) is encoded in utf-8.
|
||
For technical reasons some browsers might not render the Japanese characters
|
||
correctly when the source file is viewed.</p>
|
||
</div><p>
|
||
</p>
|
||
<p>
|
||
</p><div class="figure"><a name="fig.windrose_ex7.1"></a><p class="title"><b>Figure 21.12. Japanese locale <code class="uri"><a class="uri" href="example_src/windrose_ex7.1.html" target="_top">(<code class="filename">windrose_ex7.1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/windrose_ex7.1.png" alt="Japanese locale (windrose_ex7.1.php)"></span> </div></div><p><br class="figure-break">
|
||
</p>
|
||
</div>
|
||
<div class="sect2" title="Adjusting the formatting of the windrose plot legs"><div class="titlepage"><div><div><h3 class="title"><a name="id2589068"></a>Adjusting the formatting of the windrose plot legs</h3></div></div></div>
|
||
|
||
<div class="sect3" title="Specifying range colors"><div class="titlepage"><div><div><h4 class="title"><a name="id2589080"></a>Specifying range colors</h4></div></div></div>
|
||
|
||
<p>To adjust the colors used for each range in the plot the method </p>
|
||
<p><code class="code">WindrosePlot::SetRangeColors($aRangeColors)</code>
|
||
</p>
|
||
<p>The following example shows how to set a red-brown color scale</p>
|
||
<p>
|
||
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
|
||
2
|
||
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$rangeColors = array('khaki','yellow','orange','orange:0.7','brown','darkred','black');
|
||
$windplot->SetRangeColors($rangeColors);</span></pre></td></tr></table></div><p>
|
||
</p>
|
||
</div>
|
||
<div class="sect3" title='Specifying the width of the plot "legs"'><div class="titlepage"><div><div><h4 class="title"><a name="id2589102"></a>Specifying the width of the plot "legs"</h4></div></div></div>
|
||
|
||
<p>The weight (width) of the legs used for each range in the plot is by default
|
||
set to the range 2,4,6,8,10,12,14,16,18,20 pixels. </p>
|
||
<p>This can be adjusted with a call to the method </p>
|
||
<p>
|
||
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
|
||
<p><code class="code">WindrosePlot::SetRangeWeights($aWeights)</code>
|
||
</p>
|
||
</li></ul></div><p>
|
||
</p>
|
||
<p>If fewer weights than ranges used are supplied the ranges will wrap-around.
|
||
The following example shows how to set a larger difference in size for the legs
|
||
between the ranges. </p>
|
||
<p>
|
||
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
|
||
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$windplot->SetRangeWeights(array(2,6,10,14,18));</span></pre></td></tr></table></div><p>
|
||
</p>
|
||
</div>
|
||
</div>
|
||
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