整理：php生成饼图类及示例

           今天小涛分享一下php生成饼图类及示例，在做数据统计的时候经常用到，可以直观形象的反应所占比例：

<?php

/*

* 生成饼形图片

*/

class PieChart {

private $center; //饼形中点

private $width; //饼形直径

private $image; //图形对象

function __construct($width,$backcolor = array(array(“r”=>0xFF,”g”=>0xFF,”b”=>0xFF))) {

$this->width = $width;

$this->center = $width / 2;

//创建图形对象

$this->image = imagecreatetruecolor($this->width, $this->width);

//将初始图形填充为白色

$color = imagecolorallocate($this->image, $backcolor[0][“r”], $backcolor[0][“g”], $backcolor[0][“b”]);

imagefill($this->image, 0, 0, $color);

}

//设置图形数据

public function graphData($data, $colors){

$black = imagecolorallocate($this->image, 0x00, 0x00, 0x00);

$sum = array_sum($data);

$start = -90;

for($i=0; $i<count($data); $i++){

$color = imagecolorallocate($this->image, $colors[$i][“r”], $colors[$i][“g”], $colors[$i][“b”]);

$stop = @($data[$i] / $sum * 360) + $start;

imagefilledarc($this->image, $this->center, $this->center,

$this->width, $this->width, $start, $stop, $color, IMG_ARC_PIE);

imagefilledarc($this->image, $this->center, $this->center,

$this->width, $this->width, $start, $stop, $black, IMG_ARC_NOFILL | IMG_ARC_EDGED);

$start = $stop;

}

}

//生成图形

public function flushImage(){

header(“Content-type:image/png”);

imagepng($this->image);

}

}

//代码 演示

$total = $_GET[“total”]=100;  //为了演示方便，直接赋值，这里是总数

$count = $_GET[“count”]=50;   //为了演示方便，直接赋值，这里是占百分比的对象

$data = array($total-$count,$count);

$colors = array(

array(‘r’=>0xDD,’g’=>0xEE,’b’=>0xFF),

array(‘r’=>0xFF,’g’=>0xBB,’b’=>0xAA)

);

$chart = new PieChart(200,array(array(“r”=>0xF9,”g”=>0xF9,”b”=>0xF9)));

$chart->graphData($data, $colors);

$chart->flushImage();

?>

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