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饼图生成类及示例

时间：2021-07-01 10:21:17 帮助过：12人阅读

根据传入参数自动生成饼图。

/*
* 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 $color = imagecolorallocate($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);
}
}
?>

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