PHP generates graphics (Libchart) example_PHP tutorial-PHP Tutorial-php.cn

PHP generates graphics (Libchart) example_PHP tutorial

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Release： 2016-07-13 10:25:27

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Statistical graphs are data graphs that we often see. If three arrays are displayed graphically or real estate is displayed graphically, we will use graphs. Let me introduce a php LIbchart graph generation class, which is very useful. Friends in need can refer to it.
For simple full numbers or English, you can directly use the following class (you can download the libchart class from Baidu)

Copy the code The code is as follows:

/*
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);
?>

The red fonts are calls. Methods 1, 2, and 4 are the same array. 3 is a linear graph, there may be two lines or multiple lines for comparison (it can also be a single line).
If you want to use Chinese, you may find that libchart Chinese characters are garbled. Here is a solution

The main source code of our application is as follows:

Copy the code The code is as follows:

header("content-type:image/png");
require_once('libchart/classes/libchart.php');

$chart = new VerticalBarChart(500, 250); // Parameter representation The width and height of the image to be created
$dataSet = new XYDataSet(); // Instantiate an XY axis data object

// Add four sets of data sets to this object. The first parameter of the Point object represents the X-axis coordinate,
// The second parameter represents the Y-axis coordinate
$str = 'February';

$str = mb_convert_encoding($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 )) ;
// Pass this data set to the graph Object
$chart -> setDataSet ( $dataSet ) ;
// Set the title of the graph and render it as a png file
$chart -> setTitle ( "Statistical Chart" ) ;

//$chart -> render ( "demo/generated/demo1.png" ) ;
// You need a path and file name here
// It’s as simple as the picture below The beautiful histogram comes out
$chart -> render () ;
?>

The place marked with red letters is to solve the problem of Chinese garbled characters.
2. The title is garbled:
The default Chinese display is garbled. This is due to encoding. Make the following modifications:
First, change libchar/libchart/classes/view/chart/Chart.php and find the following Content:

Copy code The code is as follows:

public function setTitle($title) { plot->setTitle($title);
}

changed to:

Copy code The code is as follows:

public function setTitle($title) {
$title = mb_convert_encoding($title, "html-entities","utf-8" );
$this->plot- >setTitle($title);
}

The third step: It is mentioned in a blog above:
1. PHP that I wrote using the Libchart library to generate charts The file is saved in utf-8 encoding
2. Find several Chinese font libraries, such as Chinese Xingkai, Songti, etc., and copy them to the libchart fonts directory
3. Modify the text.php file in the libchart classes directory
Lines 47 and 48

Copy code The code is as follows:

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

" /../fonts/The Chinese font you found";

$this->fontCondensedBold = dirname(__FILE__) . "/../fonts/The Chinese font you found";

What I modified:

Copy code

The code is as follows:

public function Text() { $baseDir = dirname(__FILE__) . "/../../../";

// Free low-res fonts based on Bitstream Vera

$this->fontCondensed = $baseDir. "fonts/FANGZHENGFANGSONG.ttf"; >
FANGZHENGFANGSONG.ttf This file is the FANGZHENG FANGSONG simplified font I found. I changed the Chinese name to look like that. In fact, it’s okay not to change it.