PHP生成图表pChart的示例解析

吾爱主题阅读：146 2021-10-21 12:30:00 评论：0

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：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 <?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：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 <?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 . '">' ; ?>