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：

* 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 inclusionsinclude(\"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 inclusionsinclude(\"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：