(PECL imagick 2, PECL imagick 3)
ImagickDraw::setFillPatternURL — Sets the URL to use as a fill pattern for filling objects
本函数还未编写文档，仅有参数列表。
Sets the URL to use as a fill pattern for filling objects. Only local URLs ("#identifier") are supported at this time. These local URLs are normally created by defining a named fill pattern with DrawPushPattern/DrawPopPattern.
fill_urlURL to use to obtain fill pattern.