网教程 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：
![pChart](/uploadfile/phpjc/ Standard inclusions <br /> include("pChart/pData.class");<br /> include("pChart/pChart.class");<br /> <br /> // Dataset definition <br /> $DataSet = new pData;<br /> //图表数据<br /> $DataSet->AddPoint(array(1,4,-3,2,-3,3,2,1,0,7,4),"Serie1");<br /> $DataSet->AddPoint(array(3,3,-4,1,-2,2,1,0,-1,6,3),"Serie2");<br /> $DataSet->AddPoint(array(4,1,2,-1,-4,-2,3,2,1,2,2),"Serie3");<br /> $DataSet->AddAllSeries();<br /> $DataSet->SetAbsciseLabelSerie();<br /> //数据图例<br /> $DataSet->SetSerieName("Microsoft","Serie1");<br /> $DataSet->SetSerieName("IBM","Serie2");<br /> $DataSet->SetSerieName("Google","Serie3");<br /> <br /> // Initialise the graph<br /> $Test = new pChart(700,230);<br /> //设置图表尺寸、样式<br /> $Test->setFontProperties("Fonts/tahoma.ttf",8);<br /> $Test->setGraphArea(50,30,680,200);<br /> $Test->drawFilledRoundedRectangle(7,7,693,223,5,240,240,240);<br /> $Test->drawRoundedRectangle(5,5,695,225,5,230,230,230);<br /> $Test->drawGraphArea(255,255,255,TRUE);<br /> $Test->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),SCALE_NORMAL,150,150,150,TRUE,0,2,TRUE);<br /> $Test->drawGrid(4,TRUE,230,230,230,50);<br /> <br /> // Draw the 0 line<br /> $Test->setFontProperties("Fonts/MankSans.ttf",6);<br /> $Test->drawTreshold(0,143,55,72,TRUE,TRUE);<br /> <br /> // Draw the bar graph<br /> //柱状图要使用drawBarGraph()<br /> $Test->drawBarGraph($DataSet->GetData(),$DataSet->GetDataDescription(),TRUE,80);<br /> <br /> <br /> // Finish the graph<br /> //制作图例、标题、字体等属性<br /> $Test->setFontProperties("Fonts/MankSans.ttf",10);<br /> $Test->drawLegend(596,150,$DataSet->GetDataDescription(),255,255,255);<br /> $Test->setFontProperties("Fonts/MankSans.ttf",10);<br /> $Test->drawTitle(50,22,"Example",50,50,50,585);<br /> <br /> //生成图表<br /> $imageFile = "example12.png";<br /> $Test->Render($imageFile);<br /> echo '<img src="'.$imageFile.'">';<br /> ?></td> </tr> </tbody></table></p><p> <div style= "pChart")
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