(UI 0.9.9)
UI\Draw\Stroke::__construct — 构造新的 Stroke
$cap
= UI\Draw\Line\Cap::Flat,$join
= UI\Draw\Line\Join::Miter,$thickness
= 1,$miterLimit
= 10将构造一个新的 Stroke
cap
UI\Draw\Line\Cap::Flat、UI\Draw\Line\Cap::Round 或 UI\Draw\Line\Cap::Square
join
UI\Draw\Line\Join::Miter、UI\Draw\Line\Join::Round 或 UI\Draw\Line\Join::Bevel
thickness
笔划的厚度
miterLimit
斜接限制(默认值对所有支持的平台都合理)