PHP生成图表pChart入门教程

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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例子

代码如下：

// Standard inclusions   

include("pChart/pData.class");

 include("pChart/pChart.class");

 // Dataset definition 

$DataSet=newpData;

 //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=newpChart(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'';

?>

这个是雷达效果的：

代码：

// Standard inclusions   

include("pChart/pData.class");

 include("pChart/pChart.class");

 // Dataset definition 

$DataSet=newpData;

 $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=newpChart(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'';

?>