应用实例:PHP生成图表pChart(附源码)

　　编程之家 jb51.cc 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：

　　

display: inline; border-left-width: 0px; border-bottom-width: 0px; width: 608px; height: 220px; border-right-width: 0px" height="230" alt="pChart" width="672" border="0" src="http://www.wfuyu.com/uploadfile/PHPjc/ Standard inclusions  
include(pChart/pData.class);
include(pChart/pChart.class);

// Dataset deFinition
$DataSet = new pData;
//图表数据
$DataSet->AddPoint(array(1,4,-3,2,3,1,7,4),Serie1);
$DataSet->AddPoint(array(3,-4,-2,-1,6,3),Serie2);
$DataSet->AddPoint(array(4,2),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(7,693,223,5,240,240);
$Test->drawRoundedRectangle(5,695,225,230,230);
$Test->drawGraphArea(255,255,TRUE);
$Test->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),SCALE_norMAL,150,TRUE,TRUE);
$Test->drawGrid(4,50);

// Draw the 0 line
$Test->setFontProperties(Fonts/MankSans.ttf,6);
$Test->drawTreshold(0,143,55,72,TRUE);

// Draw the bar graph
//柱状图要使用drawBargraph()
$Test->drawBargraph($DataSet->GetData(),80);


// Finish the graph
//制作图例、标题、字体等属性
$Test->setFontProperties(Fonts/MankSans.ttf,10);
$Test->drawLegend(596,255);
$Test->setFontProperties(Fonts/MankSans.ttf,10);
$Test->drawTitle(50,22,Example,50,585);

//生成图表
$imageFile = example12.png;

$Test->Render($imageFile);
echo'<img src='.$imageFile.'>';
?>