PHP生成图表pChart的示例解析

pchart是一个开源的图表生成库，主要涉及3个class：pchart.class, pdata.class, pcache.class，可生成20多种简单或复杂的图表，支持png，jpg，gif通用图片格式。数据源可以来自于database，csv，当然也可以手写。使用该程序php需要开启gd服务，先来看看pchart的工作流程：

主要分为三步：

* 读取用于生成图表数据（数据库、文件）* 设计图表样式（圆角、底色等）* 制作标签、题目、图例并生成图表

下面看一个简单的柱状图表：

代码如下：

<?php
 // standard inclusions
 include("pchart/pdata.class");
 include("pchart/pchart.class");
 
 // dataset definition
 $dataset = new pdata;
 //图表数据
 $dataset->addpoint(array(1,4,-3,2,-3,3,2,1,0,7,4),"serie1");
 $dataset->addpoint(array(3,3,-4,1,-2,2,1,0,-1,6,3),"serie2");
 $dataset->addpoint(array(4,1,2,-1,-4,-2,3,2,1,2,2),"serie3");
 $dataset->addallseries();
 $dataset->setabsciselabelserie();
 //数据图例
 $dataset->setseriename("microsoft","serie1");
 $dataset->setseriename("ibm","serie2");
 $dataset->setseriename("google","serie3");
 
 // initialise the graph
 $test = new pchart(700,230);
 //设置图表尺寸、样式
 $test->setfontproperties("fonts/tahoma.ttf",8);
 $test->setgrapharea(50,30,680,200);
 $test->drawfilledroundedrectangle(7,7,693,223,5,240,240,240);
 $test->drawroundedrectangle(5,5,695,225,5,230,230,230);
 $test->drawgrapharea(255,255,255,true);
 $test->drawscale($dataset->getdata(),$dataset->getdatadescription(),scale_normal,150,150,150,true,0,2,true);
 $test->drawgrid(4,true,230,230,230,50);
 
 // draw the 0 line
 $test->setfontproperties("fonts/manksans.ttf",6);
 $test->drawtreshold(0,143,55,72,true,true);
 
 // draw the bar graph
 //柱状图要使用drawbargraph()
 $test->drawbargraph($dataset->getdata(),$dataset->getdatadescription(),true,80);
 
 
 // finish the graph
 //制作图例、标题、字体等属性
 $test->setfontproperties("fonts/manksans.ttf",10);
 $test->drawlegend(596,150,$dataset->getdatadescription(),255,255,255);
 $test->setfontproperties("fonts/manksans.ttf",10);
 $test->drawtitle(50,22,"example",50,50,50,585);
 
 //生成图表
 $imagefile = "example12.png";
 $test->render($imagefile);
 echo '<img src="'.$imagefile.'">';
?>

这个是雷达效果的：

代码：

<?php
 // standard inclusions
 include("pchart/pdata.class");
 include("pchart/pchart.class");
 
 // dataset definition
 $dataset = new pdata;
 $dataset->addpoint(array("memory","disk","network","slots","cpu"),"label");
 $dataset->addpoint(array(6,4,7,4,5),"serie1");
 $dataset->addpoint(array(2,3,5,2,4),"serie2");
 $dataset->addserie("serie1");
 $dataset->addserie("serie2");
 $dataset->setabsciselabelserie("label");
 
 
 $dataset->setseriename("reference","serie1");
 $dataset->setseriename("tested computer","serie2");
 
 // initialise the graph
 $test = new pchart(400,400);
 $test->setfontproperties("fonts/tahoma.ttf",8);
 $test->drawfilledroundedrectangle(7,7,393,393,5,240,240,240);
 $test->drawroundedrectangle(5,5,395,395,5,230,230,230);
 $test->setgrapharea(30,30,370,370);
 $test->drawfilledroundedrectangle(30,30,370,370,5,255,255,255);
 $test->drawroundedrectangle(30,30,370,370,5,220,220,220);
 
 // draw the radar graph
 //要使用drawradaraxis()生成雷达效果
 $test->drawradaraxis($dataset->getdata(),$dataset->getdatadescription(),true,20,120,120,120,230,230,230);
 $test->drawfilledradar($dataset->getdata(),$dataset->getdatadescription(),50,20);
 
 // finish the graph
 $test->drawlegend(15,15,$dataset->getdatadescription(),255,255,255);
 $test->setfontproperties("fonts/tahoma.ttf",10);
 $test->drawtitle(0,22,"example",50,50,50,400);
 
 $imagefile = "example8.png";
 $test->render($imagefile);
 echo '<img src="'.$imagefile.'">';
?>

再看几个其他的效果

1，饼图：

2, 双座标曲线图：

3, 层叠柱状图：

4, 多图表：

图表的种类已经相当丰富了，具体图表设置请参考

pchart.sourceforge/documentation.php?topic=pchart

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