應用實例:PHP生成圖表pChart(附源碼)

　　幫客之家教程 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。數據源可以來自於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：

　　主要分為三步：

1. * 讀取用於生成圖表數據（數據庫、文件）
2. * 設計圖表樣式（圓角、底色等）
3. * 制作標簽、題目、圖例並生成圖表

　　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.'">';
?>

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