解析PHP生成图表pChart的示例

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：

相关学习推荐：PHP编程从入门到精通

主要分为三步：

1. * 读取用于生成图表数据（数据库、文件）
2. * 设计图表样式（圆角、底色等）
3. * 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("pChart/pData.class");
     include("pChart/pChart.class");
     // Dataset definITion  $DataSet = new pData;
     //图表数据 $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();
     //数据图例 $DataSet->
    SetSerieName("microsoft","Serie1");
     $DataSet->
    SetSerieName("IBM","Serie2");
     $DataSet->
    SetSerieName("GOOGLE","Serie3");
     // Initialise the graph $test = new pChart(700,230);
     //设置图表尺寸、样式 $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("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);
      //生成图表 $imageFile = "example12.png";
     $Test->
    Render($imageFile);
     echo 'img src="'.$imageFile.'">
    ';
    ?>
    

这个是雷达效果的：

代码：

?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("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::：

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

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