(PECL imagick 2.0.0)
ImagickDraw::setStrokeLineCap — Specifies the shape to be used at the end of open subpaths when they are stroked
$linecap
)本函数还未编写文档，仅有参数列表。
Specifies the shape to be used at the end of open subpaths when they are stroked.
linecap
LINECAP_ constant
没有返回值。