PHP生成图表pChart入门教程

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：

<?php

// Standard inclusions WenZhou Sunglasses

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WenZhou Sunglasses

$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Wholesale designer sunglasses

$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Wholesale Discount Sunglasses

$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=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 graphAcetate Sunglasses

$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 graphMetal Sunglasses

$Test->drawLegend(15,15,$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.'">';

?>