d72ac078
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Ajout graphe V1.1
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Specifying and formatting the overall displayed graph</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="ch14.html" title="Chapter 14. Common features for all Cartesian (x,y) graph types"></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">Specifying and formatting the overall displayed graph</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 14. Common features for all Cartesian (x,y) graph types</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Specifying and formatting the overall displayed graph"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec.overall-graph-formatting"></a>Specifying and formatting the overall displayed graph</h2></div></div></div>
<p>The overall look and feel of the graph can be adjusted in a number of ways.</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>color of the plot area</p>
</li><li class="listitem">
<p>color of the margin</p>
</li><li class="listitem">
<p>size of the margin (and hence the position of the plot area)</p>
</li><li class="listitem">
<p>title(s) of the graph, a graph can have both a "title", "subtitle" and
a "subsubtitle"</p>
</li><li class="listitem">
<p>drop shadow around the graph</p>
</li><li class="listitem">
<p>adding how long time it took to generate the graph</p>
</li></ul></div><p>
</p>
<div class="sect2" title="Adjusting size, margins and frame"><div class="titlepage"><div><div><h3 class="title"><a name="id2541423"></a>Adjusting size, margins and frame</h3></div></div></div>
<p>The overall size of the graph is specified in the initial creation of the
"<code class="code">$graph</code>" instance. This is mandatory. </p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$graph = new Graph($width,$height);</span></pre></td></tr></table></div><p>
</p>
<p>The margin determines the space between the edges of the plotarea and edge of
the graph. Please note that the edge does not include the frame around the
entire graph area, i.e. whatever weight the frame edge has it doesn't impact on
the margin area. The margin is specified in the order left,right,top and bottom
margin and the size is specified in pixels.</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">$graph->SetMargin(30,10,40,20);</span></pre></td></tr></table></div><p>
</p>
<p>The default margin will be as narrow as possible but still have enough space
to show the titles and labels. The final adjustments is wheter or not the graph
will have a frame or not. There are two distinctions to be made here. No frame
meaning that the margin area will not be colored (i.e. painted) and no frame as
in no edge around the graph area. The first case is achieved by calling the
<code class="code">SetFrame()</code> method on the Graph class</p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$graph->SetFrame(false);</span></pre></td></tr></table></div><p>
</p>
<p>and the second case is achieved by setting the frame edge to have weight zero.
Since the weight is given as the third argument we wtill have to put in valid
"dummy" argument for the on/off flag and the frame color parameter.</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">$graph->SetFrame(true,'black',0);</span></pre></td></tr></table></div><p>
</p>
<p>Refer to <a class="xref" href="ch12.html#fig.common-objects" title="Figure 12.1. Commonly used objects in a graph (common-obj-graph.php)">Figure 12.1. Commonly used objects in a graph (<code class="uri"><a class="uri" href="example_src/common-obj-graph.html" target="_top">common-obj-graph.php</a></code>)</a> for definitoin of plot aea
and margin.</p>
</div>
<div class="sect2" title="Adding drop shadow to the graph"><div class="titlepage"><div><div><h3 class="title"><a name="id2541500"></a>Adding drop shadow to the graph</h3></div></div></div>
<p>A graph can have a drop shadow specified with the method
<code class="code">SetShadow()</code> which has the signature</p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">SetShadow($aShowShadow=true,$aShadowWidth=5,$aShadowColor=array(102,102,102))</span></pre></td></tr></table></div><p>
</p>
<p>by default there will be no dropshadow. Note that the drop shadow is a
straight simple shadow and has no Gaussian blur.</p>
</div>
<div class="sect2" title="Formatting and specifying the titles of the graph"><div class="titlepage"><div><div><h3 class="title"><a name="sec2.fomratting-graph-titles"></a>Formatting and specifying the titles of the graph</h3></div></div></div>
<p>There are three possible standard titles in the graph</p>
<p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p><code class="code">$graph->title</code></p>
</li><li class="listitem">
<p><code class="code">$graph->subtitle</code></p>
</li><li class="listitem">
<p><code class="code">$graph->subsubtitle</code></p>
</li></ol></div><p>
</p>
<p>Each title is an instance of the Text class which means it supports the
standard text adjusting methods <code class="code">SetFont()</code>, <code class="code">Set()</code>,
<code class="code">SetColor()</code> etc. The title s will be centered on the top of the
graph area with the title highest up, subtitle below and finally the subsubtitle
below that as shown in <a class="xref" href="ch14s02.html#fig.titleex1" title="Figure 14.6. The various titles in a graph (titleex1.php)">Figure 14.6. The various titles in a graph <code class="uri"><a class="uri" href="example_src/titleex1.html" target="_top">(<code class="filename">titleex1.php</code>)</a></code> </a></p>
<p>
</p><div class="figure"><a name="fig.titleex1"></a><p class="title"><b>Figure 14.6. The various titles in a graph <code class="uri"><a class="uri" href="example_src/titleex1.html" target="_top">(<code class="filename">titleex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/titleex1.png" alt="The various titles in a graph (titleex1.php)"></span> </div></div><p><br class="figure-break">
</p>
<p>In addition to the above standard titles there is also another type of graph
titles called the "Tabular title". This is a title that sits directly on the
plot area looking like a "tab" in a sorting cabinet. <a class="xref" href="ch14s02.html#fig.gradbkgex1" title="Figure 14.7. Tabtitle and gradient background (gradbkgex1.php)">Figure 14.7. Tabtitle and gradient background <code class="uri"><a class="uri" href="example_src/gradbkgex1.html" target="_top">(<code class="filename">gradbkgex1.php</code>)</a></code> </a> and <a class="xref" href="ch14s02.html#fig.imgmarkerex1" title="Figure 14.8. Tabtitle and image marker in a line plot (imgmarkerex1.php)">Figure 14.8. Tabtitle and image marker in a line plot <code class="uri"><a class="uri" href="example_src/imgmarkerex1.html" target="_top">(<code class="filename">imgmarkerex1.php</code>)</a></code> </a>
shows examples of this.</p>
<p>
</p><div class="informaltable">
<table border="0"><colgroup><col class="c1"><col class="newCol2"></colgroup><tbody><tr><td>
<div class="figure"><a name="fig.gradbkgex1"></a><p class="title"><b>Figure 14.7. Tabtitle and gradient background <code class="uri"><a class="uri" href="example_src/gradbkgex1.html" target="_top">(<code class="filename">gradbkgex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/gradbkgex1.png" alt="Tabtitle and gradient background (gradbkgex1.php)"></span> </div></div><br class="figure-break">
</td><td>
<div class="figure"><a name="fig.imgmarkerex1"></a><p class="title"><b>Figure 14.8. Tabtitle and image marker in a line plot <code class="uri"><a class="uri" href="example_src/imgmarkerex1.html" target="_top">(<code class="filename">imgmarkerex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/imgmarkerex1.png" alt="Tabtitle and image marker in a line plot (imgmarkerex1.php)"></span> </div></div><br class="figure-break">
</td></tr></tbody></table>
</div><p>
</p>
<p>These type of titles are created by using the </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">$graph->tabtitle</span></pre></td></tr></table></div><p>
</p>
<p>property in the Graph class. For example the tabtitle in <a class="xref" href="ch07s04.html#fig.barlinealphaex1" title="Figure 7.2. Making use of transparency to combine two plots (barlinealphaex1.php)">Figure 7.2. Making use of transparency to combine two plots <code class="uri"><a class="uri" href="example_src/barlinealphaex1.html" target="_top">(<code class="filename">barlinealphaex1.php</code>)</a></code> </a> was generated by adding the lines</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">$graph->tabtitle->Set('Year 2003');
$graph->tabtitle->SetFont(FF_ARIAL,FS_BOLD,10);</span></pre></td></tr></table></div><p>
</p>
<div class="sect3" title="Adding special background to the title"><div class="titlepage"><div><div><h4 class="title"><a name="id2541803"></a>Adding special background to the title</h4></div></div></div>
<p>There is one more way to make the graph title stand out that. This feature
is probably one of the least known ways to adjust the graph title and is
used to put a lot of emphasis on the title by having a separate color (and
style) for the background of the graph title.</p>
<p>
</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>This feature was added by the request of one of our users who had
a company design policy that demanded these type sof formatting
options for graphs.</p>
</div><p>
</p>
<p>The two methods used to control this style are</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><code class="code">Graph::SetTitleBackground($aBackColor='gray',
$aStyle=TITLEBKG_STYLE1, $aFrameStyle=TITLEBKG_FRAME_NONE,
$aFrameColor='black', $aFrameWeight=1, $aBevelHeight=3,
$aEnable=true)</code></p>
<p>This method is the basic method to specify a solid color
background with the defined style and type of framing. The first
style paramatere specifies the extension of the background and
how it interacts with the frame around the image.</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem">
<p><code class="code">TITLEBKG_STYLE1</code>, The title frame will
be drawn inside the overall graph frame</p>
</li><li class="listitem">
<p><code class="code">TITLEBKG_STYLE2</code>, The title frame will
extend all the way to the edge of the graph and
overwrite any graph frame</p>
</li><li class="listitem">
<p><code class="code">TITLEBKG_STYLE3</code>, This is the same as
TITLEBKG_STYLE2 apart from when it is used together
with framestyle TITLEBKG_FRAME_BEVEL then the bevel
frame border is on top of the title frame
border</p>
</li></ul></div><p>
</p>
</li><li class="listitem">
<p><code class="code">Graph::SetTitleBackgroundFillStyle($aStyle,$aColor1='black',$aColor2='white')</code></p>
<p>The method determines adjusts the way the background of the
title is filled by allowing a simple pattern filling to be set.
This pattern filling is either horizontal or vertical stripes
(lines) with user selectable colors. The possible patterns
are</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem">
<p><code class="code">TITLEBKG_FILLSTYLE_HSTRIPED</code>, The
background will have horizontal stripes with
<code class="code">$aColor1</code> on a background with
<code class="code">$aColor2</code></p>
</li><li class="listitem">
<p><code class="code">TITLEBKG_FILLSTYLE_HSTRIPED</code>, The
background will have vertical stripes with
<code class="code">$aColor1</code> on a background with
<code class="code">$aColor2</code></p>
</li><li class="listitem">
<p><code class="code">TITLEBKG_FILLSTYLE_SOLID</code>, The
background will only have one color specified as
<code class="code">$aColor1</code></p>
</li></ul></div><p>
</p>
</li></ul></div><p>
</p>
<p>To better show the effect of the possible combinations the table below
shows a matrix of the possible combinations and the resulting styles. To
keep the table small only the relevant top are of the graph with the title
is shown.In addition to keep the style simple we have only used shades of
gray.</p>
<p>
</p><div class="informaltable">
<table border="0"><colgroup><col class="c1"><col class="c2"><col class="c3"><col class="c4"></colgroup><tbody><tr><td><span class="bold"><strong>Frame/Fill
style</strong></span></td><td>
<p><code class="code">TITLEBKG_FILLSTYLE_HSTRIPED</code></p>
</td><td>
<p><code class="code">TITLEBKG_FILLSTYLE_VSTRIPED</code></p>
</td><td>
<p><code class="code">TITLEBKG_FILLSTYLE_SOLID</code></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE1,</p>
<p>TITLEBKG_FRAME_NONE</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground00.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground01.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground02.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE2,</p>
<p>TITLEBKG_FRAME_NONE</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground10.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground11.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground12.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE3,</p>
<p>TITLEBKG_FRAME_NONE</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground20.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground21.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground22.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE1,</p>
<p>TITLEBKG_FRAME_FULL</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground30.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground31.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground32.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE2,</p>
<p>TITLEBKG_FRAME_FULL</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground40.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground41.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground42.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE3,</p>
<p>TITLEBKG_FRAME_FULL</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground50.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground51.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground52.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE1,</p>
<p>TITLEBKG_FRAME_BOTTOM</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground60.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground61.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground62.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE2,</p>
<p>TITLEBKG_FRAME_BOTTOM</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground70.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground71.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground72.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE3,</p>
<p>TITLEBKG_FRAME_BOTTOM</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground80.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground81.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground82.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE1,</p>
<p>TITLEBKG_FRAME_BEVEL</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground90.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground91.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground92.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE2,</p>
<p>TITLEBKG_FRAME_BEVEL</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground100.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground101.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground102.png"></span></p>
</td></tr><tr><td>
<p>TITLEBKG_STYLE3,</p>
<p>TITLEBKG_FRAME_BEVEL</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground110.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground111.png"></span></p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/titlebackground112.png"></span></p>
</td></tr></tbody></table>
</div><p>
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>There is a change in the behaviour of the latest GD library that
causes style 2 and style 3 in JpGraph 2.x to be more or less visually
identical as can be seen above. Using 1.x will more clearly show the
difference. The reason is that with JpGraph 2.x we rely more heavily on
the GD built in functions while in 1.x many of the functions where
instead implemented in the library (since they weren't earlier available
in GD 1.x). The change in JpGraph 2.x was made to increase the
performance, unfortunately some minor differences exist in the way GD
2.x handles border line cases as how to handle pixel-by-pixel accuracy
(or convention). Over time these changes will become less and less as
parts of the library will be adjusted to the new GD 2.x
behaviour.</p>
<p>A typical example of changed behaviour is how rectangles with
thickness > 1 are positioned. The library assumes that the top left
(0,0) corner is the very top left part of the rectangle. This is not so
with GD 2.x. Instead (0,0) is the center point on the line. If the line
has thickness=1 they are identical but not if the line has a thickness >
1</p>
</div>
</div>
</div>
<div class="sect2" title="Specifying the image format to use"><div class="titlepage"><div><div><h3 class="title"><a name="id2542819"></a>Specifying the image format to use</h3></div></div></div>
<p>As described in <a class="xref" href="ch03s02.html" title="Necessary system requirements for the library">Necessary system requirements for the library</a> the actual image compression
available depends on the system setup. Assuming the needed sewtup is done then
the image format can be specified by using the method
<code class="code">Graph::SetImgFormat()</code> and specifying the wanted format as a
string. For example as</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">$graph->SetImgFormat('jpg',80);</span></pre></td></tr></table></div><p>
</p>
<p>The method call above selects JPEG image compression algorithm and tells the
algorithm to set the quality parameter to 80%. This additional parameter is only
applicable together with JPG formatting.</p>
</div>
<div class="sect2" title="Generic line formatting"><div class="titlepage"><div><div><h3 class="title"><a name="id2542875"></a>Generic line formatting</h3></div></div></div>
<p>Any lines in the library can have a number of formatting option. Attributes
that can be adjusted are</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>Lineweight (thickness). The weight is specified in pixels and can
be any integer values</p>
</li><li class="listitem">
<p>Linestyle , (dashed, dotted, solid etc). The style is specified as
a string using the line method <code class="code">SetLineStyle()</code>. </p>
<p>The available line styles are</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="circle"><li class="listitem">
<p>'solid', A solid line</p>
</li><li class="listitem">
<p>'dotted', A line with dots</p>
</li><li class="listitem">
<p>'dashed', A line with short hyphens</p>
</li><li class="listitem">
<p>'longdashed', A line with long hyphens</p>
</li></ul></div><p>
</p>
<p>For example to following method call set the y-grid to use the
"dotted" style</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">$graph->ygrid->SetLineStyle('dotted');</span></pre></td></tr></table></div><p>
</p>
<p>The image in <a class="xref" href="ch14s02.html#fig.different-line-styles" title="Figure 14.9. Different line formatting">Figure 14.9. Different line formatting</a> shows
example of different line formatting styles</p>
<p>
</p><div class="figure"><a name="fig.different-line-styles"></a><p class="title"><b>Figure 14.9. Different line formatting</b></p><div class="figure-contents">
<div class="informaltable">
<table border="0"><colgroup><col class="c1"><col class="c2"><col class="c3"></colgroup><tbody><tr><td>
<p><span class="inlinemediaobject"><img src="images/linestyle_standard.png" alt="Different line formatting"></span></p>
<p>Standard</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/linestyle_antialias.png" alt="Different line formatting"></span></p>
<p>Anti-aliased</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/linestyle_thick.png" alt="Different line formatting"></span></p>
<p>Thick (3 pixels)</p>
</td></tr><tr><td>
<p><span class="inlinemediaobject"><img src="images/linestyle_dashed.png" alt="Different line formatting"></span></p>
<p>Dashed</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/linestyle_longdash.png" alt="Different line formatting"></span></p>
<p>Long-dash</p>
</td><td>
<p><span class="inlinemediaobject"><img src="images/linestyle_dotted.png" alt="Different line formatting"></span></p>
<p>Dotted</p>
</td></tr></tbody></table>
</div>
</div></div><p><br class="figure-break">
</p>
</li><li class="listitem">
<p>Color. The line color is (as usual) adjusted with the method
<code class="code">SetColor()</code>.</p>
<p>For example the following line sets the color of the x-grid to
lightblue.</p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$graph->xgrid->SetColor('lightblue');</span></pre></td></tr></table></div><p>
</p>
</li></ul></div><p>
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>If anti-aliasing is enabled (see ??.) then all line weights will always be
interpreted as having weight 1 regardless.</p>
</div>
<p>
</p><div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
<p>To avoid drawing a line set the line weight to 0</p>
</div><p>
</p>
</div>
<div class="sect2" title="Adding a footer to the graph"><div class="titlepage"><div><div><h3 class="title"><a name="sec.adding-footer"></a>Adding a footer to the graph</h3></div></div></div>
<p>It is possible to add a footer to the graph as well. The footer can have a
left, center and right part. The footer is accessed trough the footer property
of the Graph class and its three parts "left", "right" and "center". These parts
are instances of the <code class="code">Text</code> class and hence all normal text
formatting c an be applied to each part of the footer. The following code
snippet shows how the footer parts can be set.</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
3
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">$graph->footer->left->Set('Left footer');
$graph->footer->center->Set('Center footer');
$graph->footer->right->Set('Right footer');</span></pre></td></tr></table></div><p>
</p>
<p>An example of using a footer is shown in <a class="xref" href="ch14s02.html#fig.footerex1" title="Figure 14.11. Adding a left,right and center footer (footerex1.php)">Figure 14.11. Adding a left,right and center footer <code class="uri"><a class="uri" href="example_src/footerex1.html" target="_top">(<code class="filename">footerex1.php</code>)</a></code> </a></p>
<p>
</p><div class="figure"><a name="id2543242"></a><p class="title"><b>Figure 14.10. Using a footer in a graph</b></p><div class="figure-contents">
<div class="figure"><a name="fig.footerex1"></a><p class="title"><b>Figure 14.11. Adding a left,right and center footer <code class="uri"><a class="uri" href="example_src/footerex1.html" target="_top">(<code class="filename">footerex1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/footerex1.png" alt="Using a footer in a graph"></span> </div></div><br class="figure-break">
</div></div><p><br class="figure-break">
</p>
</div>
<div class="sect2" title="Adding timing of graphs"><div class="titlepage"><div><div><h3 class="title"><a name="id2543252"></a>Adding timing of graphs</h3></div></div></div>
<p>The footer in the bottom of the graph can also be used to show an
approximative timing of the graph generation. This is done with the help of
<code class="code">class JpgTimer</code>. This timer class offers two methods</p>
<p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p><code class="code">JpgTimer::Push()</code>, Starts a new timer and puts it at
the top of the timer stack</p>
</li><li class="listitem">
<p><code class="code">JpgTimer::Pop()</code>, Pops the timer at the top of the
stack and returns the time (in ms) since the timer was pushed</p>
</li></ol></div><p>
</p>
<p>(The stack based design makes it possible to have multiple timers running at
the same time without interfering each other.)</p>
<p>The footer class (<a class="xref" href="ch14s02.html#sec.adding-footer" title="Adding a footer to the graph">Adding a footer to the graph</a>) have a special
provision to handle an instance of the timer class</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><code class="code">Footer::SetTimer($aTimer,$aSuffix='')</code></p>
<p><code class="code">$aTimer</code>, an instance of JpgTimer</p>
<p><code class="code">$aSuffix</code>, an optional suffix string that will be
added at the end of the timing value</p>
</li></ul></div><p>
</p>
<p>At the end of the graph generation the specified timer will be sent the sign
pop and the resulting timer value will be stored in the right footer of the
graph (appended to any previous value in the footer). For example the following
simple lines would time the graph generation.</p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-inlinetags"><?php</span><span class="hl-code">
</span><span class="hl-comment">//</span><span class="hl-comment"> Create a new timer instance</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$timer</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">JpgTimer</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> Start the timer</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$timer</span><span class="hl-code">-></span><span class="hl-identifier">Push</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> Create the graph. These two calls are always required</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$graph</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">Graph</span><span class="hl-brackets">(</span><span class="hl-number">300</span><span class="hl-code">,</span><span class="hl-number">200</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">SetScale</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">textlin</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> Make the bottom margin large enough to hold the timer value</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">SetMargin</span><span class="hl-brackets">(</span><span class="hl-number">40</span><span class="hl-code">,</span><span class="hl-number">20</span><span class="hl-code">,</span><span class="hl-number">20</span><span class="hl-code">,</span><span class="hl-number">60</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">title</span><span class="hl-code">-></span><span class="hl-identifier">Set</span><span class="hl-brackets">(</span><span class="hl-quotes">"</span><span class="hl-string">Timing a graph</span><span class="hl-quotes">"</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">footer</span><span class="hl-code">-></span><span class="hl-identifier">right</span><span class="hl-code">-></span><span class="hl-identifier">Set</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">Timer (ms): </span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">footer</span><span class="hl-code">-></span><span class="hl-identifier">right</span><span class="hl-code">-></span><span class="hl-identifier">SetFont</span><span class="hl-brackets">(</span><span class="hl-identifier">FF_COURIER</span><span class="hl-code">,</span><span class="hl-identifier">FS_ITALIC</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">footer</span><span class="hl-code">-></span><span class="hl-identifier">SetTimer</span><span class="hl-brackets">(</span><span class="hl-var">$timer</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> The rest of the script as normal ..</span><span class="hl-comment"></span></pre></td></tr></table></div><p>
</p>
<p>
</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>Remember to make the bottom margin large enough.</p>
</div><p>
</p>
<p><a class="xref" href="ch14s02.html#fig.example11" title="Figure 14.12. Adding a timer to the graph (in the footer) (example11.php)">Figure 14.12. Adding a timer to the graph (in the footer) <code class="uri"><a class="uri" href="example_src/example11.html" target="_top">(<code class="filename">example11.php</code>)</a></code> </a> shows an example of using a timer to add
the time (in ms) it took to generate the graph</p>
<p>
</p><div class="figure"><a name="fig.example11"></a><p class="title"><b>Figure 14.12. Adding a timer to the graph (in the footer) <code class="uri"><a class="uri" href="example_src/example11.html" target="_top">(<code class="filename">example11.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/example11.png" alt="Adding a timer to the graph (in the footer) (example11.php)"></span> </div></div><p><br class="figure-break">
</p>
</div>
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