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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Using layout classes to position matrix plots</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="ch22.html" title="Chapter 22. Matrix graphs"></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">Using layout classes to position matrix plots</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 22. Matrix graphs</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Using layout classes to position matrix plots"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec.matrix-layout-classes"></a>Using layout classes to position matrix plots</h2></div></div></div>
<p>Normally we don't want to have to calculate the absolute x and y coordinates when
positioning multiple Matrix plots in graph. A much better concept would be to just tell
the library to position three matrix plots horizontally or vertically without having to
figure out the exact coordinates our self but just evenly distribute them in the
specified direction.</p>
<p>This is where layout classes come in handy.</p>
<p>There are two types of layouts; horizontal and vertical. To specify that two matrix
plots should be positioned side by side (horizontal) a new horizontal layout object is
created and then the two matrix plots are added as object within the horizontal layout
class. Later on when the objects are about to be stroked on the graph the horizontal
layout class will take all its objects and spread them out evenly along a horizontal
line depending on the individual size of each matrix plot (including the specified
margin). The same principle applies to the vertical layout class with the obvious change
in direction.</p>
<p>The layout object are added to the graph in exactly the same way as ordinary matrix
plots, by calling the <code class="code">MatrixGraph::Add()</code> method. </p>
<p>The following line would create a horizontal line of three matrix plots</p>
<p>
</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-inlinetags">&lt;?php</span><span class="hl-code">
</span><span class="hl-var">$graph</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">MatrixGraph</span><span class="hl-brackets">(</span><span class="hl-var">$width</span><span class="hl-code">,</span><span class="hl-var">$height</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> additional graph formatting</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$mp1</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">MatrixPlot</span><span class="hl-brackets">(</span><span class="hl-var">$mat1</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$mp2</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">MatrixPlot</span><span class="hl-brackets">(</span><span class="hl-var">$mat1</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$mp3</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">MatrixPlot</span><span class="hl-brackets">(</span><span class="hl-var">$mat1</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$hor</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">LayoutHor</span><span class="hl-brackets">(</span><span class="hl-code"> </span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-code"> </span><span class="hl-var">$mp1</span><span class="hl-code">, </span><span class="hl-var">$mp2</span><span class="hl-code">, </span><span class="hl-var">$mp3</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-&gt;</span><span class="hl-identifier">Add</span><span class="hl-brackets">(</span><span class="hl-var">$hor</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-&gt;</span><span class="hl-identifier">Stroke</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-inlinetags">?&gt;</span></pre></td></tr></table></div><p>
</p>
<p>A complete example of this can be seen in <a class="xref" href="ch22s07.html#fig.matrix_layout_ex1" title="Figure 22.12. Using layout classes with Matrix plots (matrix_layout_ex1.php)">Figure 22.12. Using layout classes with Matrix plots <code class="uri"><a class="uri" href="example_src/matrix_layout_ex1.html" target="_top">(<code class="filename">matrix_layout_ex1.php</code>)</a></code> </a></p>
<p>
</p><div class="example"><a name="example.matrix_layout_ex1"></a><p class="title"><b>Example 22.4. Using layout classes with Matrix plots (<code class="filename">matrix_layout_ex1.php</code>) </b></p><div class="example-contents"> <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-inlinetags">&lt;?php</span><span class="hl-code">
</span><span class="hl-reserved">require_once</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">jpgraph/jpgraph.php</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-reserved">require_once</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">jpgraph/jpgraph_matrix.php</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$data</span><span class="hl-code"> = </span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-code">
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">6</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">10</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">10</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">6</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">0</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">6</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">10</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">10</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">17</span><span class="hl-code">,</span><span class="hl-number">6</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">0</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">10</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">10</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">10</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">6</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">12</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">0</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-number">10</span><span class="hl-code">,</span><span class="hl-number">9</span><span class="hl-code">,</span><span class="hl-number">8</span><span class="hl-code">,</span><span class="hl-number">7</span><span class="hl-code">,</span><span class="hl-number">6</span><span class="hl-code">,</span><span class="hl-number">5</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-code">,</span><span class="hl-number">3</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-number">1</span><span class="hl-code">,</span><span class="hl-number">0</span><span class="hl-brackets">)</span><span class="hl-code">,
</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-identifier">doMeshInterpolate</span><span class="hl-brackets">(</span><span class="hl-var">$data</span><span class="hl-code">,</span><span class="hl-number">4</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">MatrixGraph</span><span class="hl-brackets">(</span><span class="hl-number">850</span><span class="hl-code">,</span><span class="hl-number">580</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-&gt;</span><span class="hl-identifier">title</span><span class="hl-code">-&gt;</span><span class="hl-identifier">Set</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">Matrix layout example</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-&gt;</span><span class="hl-identifier">title</span><span class="hl-code">-&gt;</span><span class="hl-identifier">SetFont</span><span class="hl-brackets">(</span><span class="hl-identifier">FF_ARIAL</span><span class="hl-code">,</span><span class="hl-identifier">FS_BOLD</span><span class="hl-code">,</span><span class="hl-number">14</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$mp</span><span class="hl-code"> = </span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$n</span><span class="hl-code"> = </span><span class="hl-number">5</span><span class="hl-code">;
</span><span class="hl-reserved">for</span><span class="hl-brackets">(</span><span class="hl-var">$i</span><span class="hl-code">=</span><span class="hl-number">0</span><span class="hl-code">; </span><span class="hl-var">$i</span><span class="hl-code"> &lt; </span><span class="hl-var">$n</span><span class="hl-code">; ++</span><span class="hl-var">$i</span><span class="hl-brackets">)</span><span class="hl-brackets">{</span><span class="hl-code">
</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-var">$i</span><span class="hl-brackets">]</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">MatrixPlot</span><span class="hl-brackets">(</span><span class="hl-var">$data</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-var">$i</span><span class="hl-brackets">]</span><span class="hl-code">-&gt;</span><span class="hl-identifier">colormap</span><span class="hl-code">-&gt;</span><span class="hl-identifier">SetMap</span><span class="hl-brackets">(</span><span class="hl-var">$i</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-reserved">if</span><span class="hl-brackets">(</span><span class="hl-code"> </span><span class="hl-var">$i</span><span class="hl-code"> &lt; </span><span class="hl-number">2</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-var">$i</span><span class="hl-brackets">]</span><span class="hl-code">-&gt;</span><span class="hl-identifier">SetSize</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-number">.35</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-reserved">else</span><span class="hl-code">
</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-var">$i</span><span class="hl-brackets">]</span><span class="hl-code">-&gt;</span><span class="hl-identifier">SetSize</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-number">.21</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> We need to make the legend a bit smaller since by </span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-comment">//</span><span class="hl-comment"> defalt has a ~45% height </span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-var">$i</span><span class="hl-brackets">]</span><span class="hl-code">-&gt;</span><span class="hl-identifier">legend</span><span class="hl-code">-&gt;</span><span class="hl-identifier">SetModuleSize</span><span class="hl-brackets">(</span><span class="hl-number">15</span><span class="hl-code">,</span><span class="hl-number">2</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-brackets">}</span><span class="hl-code">
</span><span class="hl-var">$hor1</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">LayoutHor</span><span class="hl-brackets">(</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-number">0</span><span class="hl-brackets">]</span><span class="hl-code">,</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-number">1</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$hor2</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">LayoutHor</span><span class="hl-brackets">(</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-number">2</span><span class="hl-brackets">]</span><span class="hl-code">,</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-number">3</span><span class="hl-brackets">]</span><span class="hl-code">,</span><span class="hl-var">$mp</span><span class="hl-brackets">[</span><span class="hl-number">4</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$vert</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">LayoutVert</span><span class="hl-brackets">(</span><span class="hl-reserved">array</span><span class="hl-brackets">(</span><span class="hl-var">$hor1</span><span class="hl-code">,</span><span class="hl-var">$hor2</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$vert</span><span class="hl-code">-&gt;</span><span class="hl-identifier">SetCenterPos</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-number">.45</span><span class="hl-code">,</span><span class="hl-number">0</span><span class="hl-number">.5</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-&gt;</span><span class="hl-identifier">Add</span><span class="hl-brackets">(</span><span class="hl-var">$vert</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-&gt;</span><span class="hl-identifier">Stroke</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-inlinetags">?&gt;</span></pre></td></tr></table></div></div></div><p><br class="example-break"> </p><div class="figure"><a name="fig.matrix_layout_ex1"></a><p class="title"><b>Figure 22.12. Using layout classes with Matrix plots <code class="uri"><a class="uri" href="example_src/matrix_layout_ex1.html" target="_top">(<code class="filename">matrix_layout_ex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/matrix_layout_ex1.png" alt="Using layout classes with Matrix plots (matrix_layout_ex1.php)"></span> </div></div><p><br class="figure-break">
</p>
<p>When using layout classes there is one parameter of the matrix plot that can be
adjusted and that is the margin around each matrix plot. This margin is controlled by a
call to</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>
<code class="code">MatrixPlot::SetMargin($aMargin)</code>
</p>
</li></ul></div><p>
</p>
<p>By default the margin is 20 pixels on each side. This margin also takes the legend
into consideration so the margin is counted from the edge of the legend.</p>
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