php生成图形（Libchart）实例
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 $style;
- function drawPic($,$width="500",$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($this->|$this->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->|$this->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";
- }
FANGZHENGFANGSONG.ttf 这个文件是我找的方正仿宋简体字库，我把中文名字改成那个样子了，其实不改也是可以的。