JpGraph簡介
JpGraph是開源的PHP統計圖表生成庫，基于PHP的GD2圖形庫構建，把生成統計圖的相關操作封裝，隱藏了部分復雜的操作，使在PHP頁面上輸出統計圖表變得更加容易。JpGraph的官方網站為：http://jpgraph.net，開發者可以在上面免費下載最新版的JpGraph和閱讀相關幫助文檔或示例程序。
JpGraph的配置
（1）修改文件php.ini
在include_path中添加jpgraph的目錄路徑，并將jpgraph解壓后的src目錄名稱更改為jpgraph。
（2）檢查PHP是否支持GD庫
在php.ini文件中找到語句;extension=php_gd2.dll。把上述語句前的;號去掉，即去掉注釋。如果因為PHP版本不同而找不到此語句，則可直接添加extension=php_gd2.dll
（3）修改文件jpgraph_gb2312.php
找到函數：function gb2utf8($gb)
把函數修改為：
function gb2utf8($gb) {
return $gb;
}
即不使用gb2編碼方式轉utf8方式的那段代碼。
折線圖
<?php
require_once ("jpgraph/jpgraph.php");
require_once ("jpgraph/jpgraph_line.php");
$data1 = array(523,634,371,278,685,587,490,256,398,545,367,577); //第一條曲線的數組
$graph = new Graph(500,300);
$graph->SetScale("textlin");
$graph->SetShadow();
$graph->img->SetMargin(60,30,30,70); //設置圖像邊距
$graph->graph_theme = null; //設置主題為null，否則value->Show(); 無效
$lineplot1=new LinePlot($data1); //創建設置兩條曲線對象
$lineplot1->value->SetColor("red");
$lineplot1->value->Show();
$graph->Add($lineplot1); //將曲線放置到圖像上
$graph->title->Set("CDN流量圖"); //設置圖像標題
$graph->xaxis->title->Set("月份"); //設置坐標軸名稱
$graph->yaxis->title->Set("流 量(Gbits)");
$graph->title->SetMargin(10);
$graph->xaxis->title->SetMargin(10);
$graph->yaxis->title->SetMargin(10);
$graph->title->SetFont(FF_SIMSUN,FS_BOLD); //設置字體
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->xaxis->SetTickLabels($gDateLocale->GetShortMonth());
$graph->Stroke(); //輸出圖像
?>
柱狀圖
<?php
require_once ("jpgraph/jpgraph.php");
require_once ("jpgraph/jpgraph_bar.php");
$data = array(19,23,34,38,45,67,71,78,85,87,96,145);
$ydata = array("一","二","三","四","五","六","七","八","九","十","十一","十二");
$graph = new Graph(500,300); //創建新的Graph對象
$graph->SetScale("textlin"); //刻度樣式
$graph->SetShadow(); //設置陰影
$graph->img->SetMargin(40,30,40,50); //設置邊距
$graph->graph_theme = null; //設置主題為null，否則value->Show(); 無效
$barplot = new BarPlot($data); //創建BarPlot對象
$barplot->SetFillColor('blue'); //設置顏色
$barplot->value->Show(); //設置顯示數字
$graph->Add($barplot); //將柱形圖添加到圖像中
$graph->title->Set("CDN流量圖");
$graph->xaxis->title->Set("月份"); //設置標題和X-Y軸標題
$graph->yaxis->title->Set("流 量(Mbits)");
$graph->title->SetColor("red");
$graph->title->SetMargin(10);
$graph->xaxis->title->SetMargin(5);
$graph->xaxis->SetTickLabels($ydata);
$graph->title->SetFont(FF_SIMSUN,FS_BOLD); //設置字體
$graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
$graph->xaxis->SetFont(FF_SIMSUN,FS_BOLD);
$graph->Stroke();
?>
餅狀圖
<?php
require_once ("jpgraph/jpgraph.php");
require_once ("jpgraph/jpgraph_pie.php");
require_once ("jpgraph/jpgraph_pie3d.php");
$data = array(19,23,34,38,45,67,71,78,85,87,90,96);
$graph = new PieGraph(550,500);
$graph->SetShadow();
$graph->title->Set("CDN流量比例");
$graph->title->SetFont(FF_SIMSUN,FS_BOLD);
$pieplot = new PiePlot3D($data); //創建PiePlot3D對象
$pieplot->SetCenter(0.4, 0.5); //設置餅圖中心的位置
$pieplot->SetLegends($gDateLocale->GetShortMonth()); //設置圖例
$graph->Add($pieplot);
$graph->Stroke();
?>
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