PHP生成图表pChart

阿尔哦覅和

　　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图表：

　　代码如下：
<?php
// Standard inclusions   
include(&quot;pChart/pData.class&quot;);
include(&quot;pChart/pChart.class&quot;);
// Dataset definition
$DataSet = new pData;
//图表数据
$DataSet->AddPoint(array(1,4,-3,2,-3,3,2,1,0,7,4),&quot;Serie1&quot;);
$DataSet->AddPoint(array(3,3,-4,1,-2,2,1,0,-1,6,3),&quot;Serie2&quot;);
$DataSet->AddPoint(array(4,1,2,-1,-4,-2,3,2,1,2,2),&quot;Serie3&quot;);
$DataSet->AddAllSeries();
$DataSet->SetAbsciseLabelSerie();
//数据图例
$DataSet->SetSerieName(&quot;Microsoft&quot;,&quot;Serie1&quot;);
$DataSet->SetSerieName(&quot;IBM&quot;,&quot;Serie2&quot;);
$DataSet->SetSerieName(&quot;Google&quot;,&quot;Serie3&quot;);
// Initialise the graph
$Test = new pChart(700,230);
//设置图表尺寸、样式
$Test->setFontProperties(&quot;Fonts/tahoma.ttf&quot;,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(&quot;Fonts/MankSans.ttf&quot;,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(&quot;Fonts/MankSans.ttf&quot;,10);
$Test->drawLegend(596,150,$DataSet->GetDataDescription(),255,255,255);
$Test->setFontProperties(&quot;Fonts/MankSans.ttf&quot;,10);
$Test->drawTitle(50,22,&quot;Example&quot;,50,50,50,585);
//生成图表
$imageFile = &quot;example12.png&quot;;
$Test->Render($imageFile);
echo '<img src=&quot;'.$imageFile.'&quot;>';
?>
　　这个是雷达效果的：

　　代码：

<?php
// Standard inclusions   
include(&quot;pChart/pData.class&quot;);
include(&quot;pChart/pChart.class&quot;);
// Dataset definition
$DataSet = new pData;
$DataSet->AddPoint(array(&quot;Memory&quot;,&quot;Disk&quot;,&quot;Network&quot;,&quot;Slots&quot;,&quot;CPU&quot;),&quot;Label&quot;);
$DataSet->AddPoint(array(6,4,7,4,5),&quot;Serie1&quot;);
$DataSet->AddPoint(array(2,3,5,2,4),&quot;Serie2&quot;);
$DataSet->AddSerie(&quot;Serie1&quot;);
$DataSet->AddSerie(&quot;Serie2&quot;);
$DataSet->SetAbsciseLabelSerie(&quot;Label&quot;);

$DataSet->SetSerieName(&quot;Reference&quot;,&quot;Serie1&quot;);
$DataSet->SetSerieName(&quot;Tested computer&quot;,&quot;Serie2&quot;);
// Initialise the graph
$Test = new pChart(400,400);
$Test->setFontProperties(&quot;Fonts/tahoma.ttf&quot;,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 graph
$Test->drawLegend(15,15,$DataSet->GetDataDescription(),255,255,255);
$Test->setFontProperties(&quot;Fonts/tahoma.ttf&quot;,10);
$Test->drawTitle(0,22,&quot;Example&quot;,50,50,50,400);
$imageFile = &quot;example8.png&quot;;
$Test->Render($imageFile);
echo '<img src=&quot;'.$imageFile.'&quot;>';
?>

　　再看几个其他的效果
1，饼图：

　　2, 双座标曲线图：

　　3, 层叠柱状图：

　　4, 多图表：

　　图表的种类已经相当丰富了，具体图表设置请参考
http://pchart.sourceforge.net/documentation.php?topic=pChart

::源代码下载::