pChart是一個開源的圖表生成庫，主要涉及3個Class：pChart.class,pData.class,pCache.class，可生成20多種簡單或複雜的圖表，支援PNG，JPG，GIF通用圖片格式。資料來源可以來自於Database，CSV，當然也可以手寫。使用該程式PHP需要開啟GD服務，先來看看pChart的工作流程：

主要分為三步：

1. * 讀取用於生成圖表資料（資料庫、檔案）
2. * 設計圖表樣式（圓角、底色等）
3. * 製作標籤、題目、圖例並生成圖表

下面看一個簡單的柱狀圖表：

程式碼如下：

<?php
 // Standard inclusions  
 include("pChart/pData.class");
 include("pChart/pChart.class");

 // Dataset definition 
 $DataSet = new pData;
 //圖表資料
 $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();
 //資料圖例
 $DataSet->SetSerieName("Microsoft","Serie1");
 $DataSet->SetSerieName("IBM","Serie2");
 $DataSet->SetSerieName("Google","Serie3");

 // Initialise the graph
 $Test = new pChart(700,230);
 //設定圖表尺寸、樣式
 $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
 //柱狀圖要使用drawBarGraph()
 $Test->drawBarGraph($DataSet->GetData(),80);


 // Finish the graph
 //製作圖例、標題、字型等屬性
 $Test->setFontProperties("Fonts/MankSans.ttf",10);
 $Test->drawLegend(596,255);
 $Test->setFontProperties("Fonts/MankSans.ttf",10);
 $Test->drawTitle(50,22,"Example",50,585);
 
 //生成圖表
 $imageFile = "example12.png";
 $Test->Render($imageFile);
 echo '<img src="'.$imageFile.'">';
?>

這個是雷達效果的：

程式碼：

<?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(6,5),"Serie1");
 $DataSet->AddPoint(array(2,"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(7,393,395,230);
 $Test->setGraphArea(30,370,370);
 $Test->drawFilledRoundedRectangle(30,255);
 $Test->drawRoundedRectangle(30,220,220);

 // Draw the radar graph
 //要使用drawRadarAxis()生成雷達效果
 $Test->drawRadarAxis($DataSet->GetData(),20,120,230);
 $Test->drawFilledRadar($DataSet->GetData(),20);

 // Finish the graph
 $Test->drawLegend(15,15,255);
 $Test->setFontProperties("Fonts/tahoma.ttf",10);
 $Test->drawTitle(0,400);
 
 $imageFile = "example8.png";
 $Test->Render($imageFile);
 echo '<img src="'.$imageFile.'">';
?>

再看幾個其他的效果

1，餅圖：

2,雙座標曲線圖：

3,層疊柱狀圖：

4,多圖表：

圖表的種類已經相當豐富了，具體圖表設定請參考http://pchart.sourceforge.net/documentation.php?topic=pChart

::原始碼下載::：http://xiazai.jb51.net/202007/yuanma/pChart_jb51.rar

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