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Homephp教程php手册php绘制一个扇形的方法

这篇文章主要介绍了php绘制一个扇形的方法,涉及GD库中imagefilledarc方法的使用技巧,需要的朋友可以参考下

本文实例讲述了php绘制一个扇形的方法。分享给大家供大家参考。具体如下:

php绘制一个扇形。关于参数说明,除最后一个参数外,其它都与弧线的参数一样,请参考上一篇《php绘制一条弧线的方法》。最后一个参数有四种类型。分别是:

IMG_ARC_PIE、IMG_ARC_CHORD、IMG_ARC_NOFILL和IMG_ARC_EDGED,,具体参数说明见php手册的 imagefilledarc 画扇形函数。

复制代码 代码如下:

//1、创建画布
$im = imagecreatetruecolor(300,200);//新建一个真彩色图像,默认背景是黑色,返回图像标识符。另外还有一个函数 imagecreate 已经不推荐使用。
//2、绘制所需要的图像
$red = imagecolorallocate($im,255,0,0);//创建一个颜色
imagefilledarc($im,100,80,120,90,0,120,$red,IMG_ARC_PIE);//画扇形函数
//3、输出图像
header("content-type: image/png");
imagepng($im);//输出到页面。如果有第二个参数[,$filename],则表示保存图像
//4、销毁图像,释放内存
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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