PHP如何生成圖表pChart

PHP如何生成圖表pChart？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。

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多種簡單或復雜的圖表，支持PNG，JPG，GIF通用圖片格式。數據源可以來自于Database，CSV，當然也可以手寫。使用該程序PHP需要開啟GD服務，先來看看pChart的工作流程：

相關學習推薦：PHP編程從入門到精通

主要分為三步：

1. * 讀取用于生成圖表數據（數據庫、文件）
2. * 設計圖表樣式（圓角、底色等）
3. * 制作標簽、題目、圖例并生成圖表

下面看一個簡單的柱狀圖表：

代碼如下：

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

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

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


 // Finish the graph
 //制作圖例、標題、字體等屬性
 $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);
 
 //生成圖表
 $imageFile = "example12.png";
 $Test->Render($imageFile);
 echo '<img src="'.$imageFile.'">';
?>

這個是雷達效果的：

代碼：

<?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(6,4,7,4,5),"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()生成雷達效果
 $Test->drawRadarAxis($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.'">';
?>

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，具體圖表設置請參考

http://pchart.sourceforge.net/documentation.php?topic=pChart

::源代碼下載::：

http://xiazai.jb51.net/202007/yuanma/pChart_jb51.rar

看完上述內容，你們掌握PHP如何生成圖表pChart的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！