PHP生成图表pChart的示例解析

    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:

    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.lingkb.com/202007/yuanma/pChart_jb51.rar

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