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PHP生成圖表pChart的示例解析

更新時(shí)間：2020年07月31日 17:26:58 作者：李敬然（Gnie）

這篇文章主要介紹了PHP生成圖表pChart的示例解析，文中通過(guò)解析pChartd 工作流程和不同圖表的代碼展示，講解的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或工作具有一定的參考價(jià)值，有需要的來(lái)和小編一起學(xué)習(xí)把吧

pChart是一個(gè)開(kāi)源的圖表生成庫(kù)，主要涉及3個(gè)Class：pChart.class, pData.class, pCache.class，可生成20多種簡(jiǎn)單或復(fù)雜的圖表，支持PNG，JPG，GIF通用圖片格式。數(shù)據(jù)源可以來(lái)自于Database，CSV，當(dāng)然也可以手寫(xiě)。使用該程序PHP需要開(kāi)啟GD服務(wù)，先來(lái)看看pChart的工作流程：

主要分為三步：

* 讀取用于生成圖表數(shù)據(jù)（數(shù)據(jù)庫(kù)、文件）
* 設(shè)計(jì)圖表樣式（圓角、底色等）
* 制作標(biāo)簽、題目、圖例并生成圖表

下面看一個(gè)簡(jiǎn)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(shù)據(jù)
 $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(shù)據(jù)圖例
 $DataSet->SetSerieName("Microsoft","Serie1");
 $DataSet->SetSerieName("IBM","Serie2");
 $DataSet->SetSerieName("Google","Serie3");

 // Initialise the graph
 $Test = new pChart(700,230);
 //設(shè)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(biāo)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(gè)是雷達(dá)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(dá)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(gè)其他的效果

1，餅圖：