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：

PHP生成图表pChart的示例解析

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：

PHP生成图表pChart的示例解析

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：

PHP生成图表pChart的示例解析

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.'">';

									?>