jpgraph是php世界里一款非常方便的做各种图表的工作，柱状图、饼图、雷达图等，基本上对所有的图表无所不能。
在PEAR中，也有一款做图表的工具，叫image_graph,这个工具功能也是非常强大，但jpgraph和image_graph比起来的最大好处，就是有很多的例子和非常详细的文档说明，这就使jpgraph用起来是相当的方便。
最后决定选用jpgraph。
下面是一段代码。同时在用的过程中遇到了汉字乱码的问题，原因已经找到，也和大家说明一下。
如果您在使用jpgraph的过程遇到了什么问题，可以MAIL给我，大家一直探讨。同时，如果你有什么使用心得，也希望您能够发到LAMPER上，让更多的人分享你的经验。
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<ol class="dp-c"><li class="alt"><span><span><?php </span></span></li><li><span class="keyword">include</span><span> (</span><span class="string">"../jpgraph.php"</span><span>); </span></li><li class="alt"><span class="keyword">include</span><span> (</span><span class="string">"../jpgraph_line.php"</span><span>); </span></li><li><span> </span></li><li class="alt"><span class="vars">$ydata</span><span> = </span><span class="keyword">array</span><span>(11,3,8,12,5,1,9,13,5,7); </span></li><li><span class="vars">$y2data</span><span> = </span><span class="keyword">array</span><span>(354,200,265,99,111,91,198,225,293,251); </span></li><li class="alt"><span class="vars">$datax</span><span> = </span><span class="keyword">array</span><span>(</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>,</span><span class="string">"2006-01-01"</span><span>); </span></li><li><span> </span></li><li class="alt"><span class="comment">// Create the graph. These two calls are always required </span><span> </span></li><li><span class="vars">$graph</span><span> = </span><span class="keyword">new</span><span> Graph(800,400,</span><span class="string">"auto"</span><span>); </span></li><li class="alt"><span class="vars">$graph</span><span>->img->SetMargin(40,40,20,40); </span></li><li><span> </span></li><li class="alt"><span class="vars">$graph</span><span>->title->SetFont(FF_SIMSUN,FS_BOLD); </span></li><li><span class="vars">$title</span><span> = </span><span class="string">"展示pv/展示ip"</span><span>; </span></li><li class="alt"><span class="vars">$graph</span><span>->title->Set(</span><span class="vars">$title</span><span>); </span></li><li><span> </span></li><li class="alt"><span class="vars">$graph</span><span>->SetScale(</span><span class="string">"textlin"</span><span>); </span></li><li><span class="vars">$graph</span><span>->SetY2Scale(</span><span class="string">"lin"</span><span>); </span></li><li class="alt"><span> </span></li><li><span class="vars">$graph</span><span>->xaxis->title->Set(</span><span class="string">"时间"</span><span>); </span></li><li class="alt"><span class="vars">$graph</span><span>->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD); </span></li><li><span class="vars">$graph</span><span>->xaxis->SetTickLabels(</span><span class="vars">$datax</span><span>); </span></li><li class="alt"><span> </span></li><li><span class="vars">$graph</span><span>->yaxis->title->Set(</span><span class="string">"展示pv"</span><span>); </span></li><li class="alt"><span class="vars">$graph</span><span>->yaxis->SetColor(</span><span class="string">"blue"</span><span>); </span></li><li><span class="vars">$graph</span><span>->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD); </span></li><li class="alt"><span> </span></li><li><span class="vars">$graph</span><span>->y2axis->title->Set(</span><span class="string">"展示IP"</span><span>); </span></li><li class="alt"><span class="vars">$graph</span><span>->y2axis->SetColor(</span><span class="string">"orange"</span><span>); </span></li><li><span class="vars">$graph</span><span>->y2axis->title->SetFont(FF_SIMSUN,FS_BOLD); </span></li><li class="alt"><span> </span></li><li><span class="vars">$lineplot</span><span>=</span><span class="keyword">new</span><span> LinePlot(</span><span class="vars">$ydata</span><span>); </span></li><li class="alt"><span class="vars">$lineplot</span><span>->SetColor(</span><span class="string">"blue"</span><span>); </span></li><li><span class="vars">$lineplot</span><span>->SetWeight(2); </span></li><li class="alt"><span class="vars">$lineplot</span><span>->SetLegend(</span><span class="string">"展示pv"</span><span>); </span></li><li><span class="vars">$graph</span><span>->legend->SetFont(FF_SIMSUN,FS_BOLD); </span></li><li class="alt"><span> </span></li><li><span class="vars">$lineplot2</span><span>=</span><span class="keyword">new</span><span> LinePlot(</span><span class="vars">$y2data</span><span>); </span></li><li class="alt"><span class="vars">$lineplot2</span><span>->SetColor(</span><span class="string">"orange"</span><span>); </span></li><li><span class="vars">$lineplot2</span><span>->SetWeight(2); </span></li><li class="alt"><span class="vars">$lineplot2</span><span>->SetLegend(</span><span class="string">"展示ip"</span><span>); </span></li><li><span> </span></li><li class="alt"><span> </span></li><li><span class="vars">$graph</span><span>->Add(</span><span class="vars">$lineplot</span><span>); </span></li><li class="alt"><span class="vars">$graph</span><span>->AddY2(</span><span class="vars">$lineplot2</span><span>); </span></li><li><span> </span></li><li class="alt"><span class="comment">// Display the graph </span><span> </span></li><li><span class="vars">$graph</span><span>->Stroke(); </span></li><li class="alt"><span>?> </span></li></ol>
注意SetFont方法，如果你的文件编码是gb2312,SetFont方法的第一个参数为FF_SIMSUN即可正常显示汉字
如果你的文件编码为utf-8，还需加一句$title = iconv("UTF-8", "gb2312", $title)
在jpgraph.php中，有这么一段语句：
elseif( $aFF === FF_SIMSUN ) {
// Do Chinese conversion
if( $this->g2312 == null ) {
include_once jpgraph_gb2312.php ;
$this->g2312 = new GB2312toUTF8();
}
return $this->g2312->gb2utf8($aTxt);
}
就是说，jpgraph默认显示汉字时是把汉字编码认为gb2312,转化为utf-8以后再显示。 这样的话，如果你的文件编码是gb2312,SetFont方法的第一个参数为FF_SIMSUN即可 如果你是utf-8编码你还需要先把汉字编码转化为gb2312，这样你的汉字才可以正常显示。
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