PHP jpgraph库的配置及生成统计图表:折线图、柱状图、饼状图等

JpGraph简介

      JpGraph是开源的PHP统计图表生成库，基于PHP的GD2图形库构建，把生成统计图的相关操作封装，隐藏了部分复杂的操作，使在PHP页面上输出统计图表变得更加容易。JpGraph的官方网站为：http://jpgraph.net，开发者可以在上面免费下载最新版的JpGraph和阅读相关帮助文档或示例程序。

JpGraph的配置
（1）修改文件php.ini
      在include_path中添加jpgraph的目录路径，并将jpgraph解压后的src目录名称更改为jpgraph。

（2）检查PHP是否支持GD库

      在php.ini文件中找到语句;extension=php_gd2.dll。把上述语句前的;号去掉，即去掉注释。如果因为PHP版本不同而找不到此语句，则可直接添加extension=php_gd2.dll
 
（3）修改文件jpgraph_gb2312.php
找到函数：function gb2utf8($gb)
把函数修改为：
   function gb2utf8($gb) {
    return $gb;
 
    }

即不使用gb2编码方式转utf8方式的那段代码。

折线图

 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); //第一条曲线的数组

 $graph = new Graph(500,300);
 $graph->SetScale("textlin");
 $graph->SetShadow();
 $graph->img->SetMargin(60,30,30,70); //设置图像边距

 $graph->graph_theme = null; //设置主题为null，否则value->Show(); 无效

 $lineplot1=new LinePlot($data1); //创建设置两条曲线对象
 $lineplot1->value->SetColor("red");
 $lineplot1->value->Show();
 $graph->Add($lineplot1);  //将曲线放置到图像上

 $graph->title->Set("CDN流量图");   //设置图像标题
 $graph->xaxis->title->Set("月份"); //设置坐标轴名称
 $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); //设置字体
 $graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
 $graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD);
 $graph->xaxis->SetTickLabels($gDateLocale->GetShortMonth());

 $graph->Stroke();  //输出图像
 ?>

柱状图

 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);  //创建新的Graph对象
 $graph->SetScale("textlin");  //刻度样式
 $graph->SetShadow();          //设置阴影
 $graph->img->SetMargin(40,30,40,50); //设置边距

 $graph->graph_theme = null; //设置主题为null，否则value->Show(); 无效

 $barplot = new BarPlot($data);  //创建BarPlot对象
 $barplot->SetFillColor('blue'); //设置颜色
 $barplot->value->Show(); //设置显示数字
 $graph->Add($barplot);  //将柱形图添加到图像中

 $graph->title->Set("CDN流量图");
 $graph->xaxis->title->Set("月份"); //设置标题和X-Y轴标题
 $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);  //设置字体
 $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();
 ?>

饼状图

 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);  //创建PiePlot3D对象
 $pieplot->SetCenter(0.4, 0.5); //设置饼图中心的位置
 $pieplot->SetLegends($gDateLocale->GetShortMonth()); //设置图例

 $graph->Add($pieplot);
 $graph->Stroke();
 ?>