php生成图形（Libchart）实例

2024-09-04 11:46:56

字体：大中小

来源：转载

供稿：网友

统计图形就我们会常到的数据图形了，如果三个数组以图形显示或楼盘以图形走向我们都会要用到图形，下面介绍一个php LIbchart图形生成类.

统计图形就我们会常到的数据图形了，如果三个数组以图形显示或楼盘以图形走向我们都会要用到图形，下面我来介绍一个php LIbchart图形生成类吧，很用的有需要的朋友可参考。

简单全数字或英文的就可以直接使用下面类了(libchart类大家可自行百度下载),代码如下:

<?

/*

  update by Leo

  It's draw the pic of Sheet,and it will take all the num on the pic.

*/

require "./libchart/classes/libchart.php";

class drawPic{

  var $chart;

  var $style;

  function drawPic($style="1",$width="500",$height="250"){

   $this->style=$style;

   if($style==1){

    //cylinder

    $this->chart = new VerticalBarChart($width,$height);

   }else if($style==2){

    //line

    $this->chart = new LineChart($width,$height);

   }else if($style==3){

    //Lump

    $this->chart = new PieChart($width,$height);

   }else{

    //cross

    $this->chart=new HorizontalBarChart($width,$height);

   }

  }

  function draw($obj){

   if($this->style==1||$this->style=="1"){

    //cylinder

    $dataSet = new XYDataSet() ;

    $this->chart->setTitle($obj->title);//title

    $arr=array();

    $arr=$obj->dataArray;

    foreach($arr as $key => $val){

     $dataSet->addPoint ( new Point($key,$val)) ;

    }

    $this->chart->setDataSet ( $dataSet ) ;

    $this->chart->render();

   }else if($this->style==2||$this->style=="2"){

    //line

    $this->chart->setTitle($obj->title);//title

    $arr=array();

    $arr=$obj->dataArray;

    $i=0;

    $dataSet = new XYSeriesDataSet();

    foreach($arr as $key => $val){

     $serie{$i}= new XYDataSet();

     foreach($val as $k => $v){

      $serie{$i}->addPoint(new Point($k,$v));

     }

     $dataSet->addSerie($key,$serie{$i});

     $i=$i+1;

    }

    $this->chart->setDataSet($dataSet);

    $this->chart->render();

   }else if($style==3){

    //Lump

    $dataSet = new XYDataSet() ;

    $this->chart->setTitle($obj->title);//title

    $arr=array();

    $arr=$obj->dataArray;

    foreach($arr as $key => $val){

     $dataSet->addPoint ( new Point($key."($val)",$val)) ;

    }

    $this->chart->setDataSet ( $dataSet ) ;

    $this->chart->render();

   }else{

    //cross

    $dataSet = new XYDataSet();

    $this->chart->setTitle($obj->title);//title

    $arr=array();

    $arr=$obj->dataArray;

    foreach($arr as $key => $val){

     $dataSet->addPoint ( new Point($key,$val)) ;

    }

    $this->chart->setDataSet($dataSet);

    $this->chart->render();

   }

  }

}

class kkk{};

$n=new drawPic("4");//it will set 1 or 2 or 3 or 4

$k=new kkk();

$k->dataArray=array("2000"=>"30","2001"=>"40","2002"=>"50","2003"=>"60","2004"=>"70","2005"=>"80","20020"=>"90");//style==1 or style=2 or style=4

//$k->dataArray=array("2000"=>"30","2001"=>"40","2002"=>"50","2003"=>"60","2004"=>"70","2005"=>"80","20020"=>"90");//style==3

//$k->dataArray=array("yi"=>array("2000"=>"30","2001"=>"40","2002"=>"50","2004"=>"60"),"er"=>array("2003"=>"60","2004"=>"70","2005"=>"80","20020"=>"90"),"san"=>array("33"=>"12","45"=>"56","89"=>"45","86"=>"49"));//style==2 and the years will show first array to block.(it will be show 2000 2001 2002 2004)

$k->title="The Sheet title";

$n->draw($k);

?>

红色字体为调用。方法1，2，4为相同的数组。3为线性图，有可能有两条线或者多条线的比较（也可以单线）。

如果要使用中文可能会发现libchart中文乱码了，下面找了一个办法

我们的应用主源代码如下：

<?php

   header("content-type:image/png");

   require_once('libchart/classes/libchart.php');

   $chart = new VerticalBarChart( 500 , 250 ) ; // 参数表示需要创建的图像的宽和高

   $dataSet = new XYDataSet() ; // 实例化一个 XY 轴数据对象

     // 为这个对象增加四组数据集合， Point 对象的第一个参数表示 X 轴坐标，

// 第二个表示 Y 轴坐标

   $str = '二月';

$str = mb_convert_encoding($str, "html-entities","utf-8" );

$dataSet -> addPoint ( new Point( "Jan 2005" , 273 )) ;

    $dataSet -> addPoint ( new Point( "$str" , 120 )) ;

    $dataSet -> addPoint ( new Point( "March 2005" , 442 )) ;

    $dataSet -> addPoint ( new Point( "April 2005" , 600 )) ;

     // 把这个数据集合传递给图形对象

    $chart -> setDataSet ( $dataSet ) ;

    // 设置图形的标题，并把它作为一个 png 文件渲染

    $chart -> setTitle ( "统计图" ) ;

    //$chart -> render ( "demo/generated/demo1.png" ) ;

    // 这里需要一个路径和文件名称

    //就这么简单一个像下图一样美丽的柱状图就出来了

    $chart -> render () ;

?>

标红字的地方是为了解决中文乱码的。

2、标题乱码：

默认显示中文是乱码，这是由于编码的原因，做如下修改：

首先，更改libchar/libchart/classes/view/chart/Chart.php，找到如下内容：

public function setTitle($title) {

$this->plot->setTitle($title);

}

更改为：

public function setTitle($title) {

$title = mb_convert_encoding($title, "html-entities","utf-8" );

$this->plot->setTitle($title);

}

第三步：就是上面某个博客里讲到的：

1、自己写的使用Libchart 库生成图表的php 文件以utf-8编码保存

2、找几个中文字体库，比如华文行楷、宋体等等，复制到libchart fonts目录下

3、修改libchart classes目录下的text.php 文件

第47、48行,代码如下:

$this->fontCondensed = dirname(__FILE__) . "/../fonts/DejaVuSansCondensed.ttf";

$this->fontCondensedBold = dirname(__FILE__) . "/../fonts/DejaVuSansCondensed-Bold.ttf";

改为代码如下:

$this->fontCondensed = dirname(__FILE__) . "/../fonts/你找来的中文字体";

$this->fontCondensedBold = dirname(__FILE__) . "/../fonts/你找来的中文字体";

我修改的代码如下:

public function Text() {

    $baseDir = dirname(__FILE__) . "/../../../";

    // Free low-res fonts based on Bitstream Vera <http://dejavu.sourceforge.net/wiki/>

   $this->fontCondensed = $baseDir . "fonts/FANGZHENGFANGSONG.ttf";

    $this->fontCondensedBold = $baseDir . "fonts/FANGZHENGFANGSONG.ttf";

   }