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php绘图之生成饼状图的方法,php绘图生成饼

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Release: 2016-06-13 09:16:38
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php绘图之生成饼状图的方法,php绘图生成饼

本文实例讲述了php绘图之生成饼状图的方法。分享给大家供大家参考。具体如下:

这里要实现的功能是人口分布比例图,由扇形组成一个圆,每个扇形颜色不一样。

复制代码 代码如下:

$array = array("北京"=>1925,"上海"=>2016,"广州"=>1256,"深圳"=>980);
$arr_key = array_keys($array);
$color = array();
$im = imagecreatetruecolor(300,300);
for($i=1;$i  $color[] = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
}

//创建饼状图,由多个扇形组成
$a1=rand(0,360);
$sum = array_sum($array);
for($j=0;$j  $a2 = $a1 + $arr_key[$j]/$sum*360;
 imagefilledarc($im,150,150,180,80,$a1,$a2,$color[$j],IMG_ARC_PIE);
 $a1 = $a2;
}

//输出图像
header("content-type: image/png");
imagepng($im);
//关闭
imagedestroy($im);
?>

希望本文所述对大家的php程序设计有所帮助。

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