Sets the line join style.
type
TLineJoinStyle = ( ljMiterJoin, ljRoundJoin, ljBevelJoin );
Delphi 語法：
procedure SetLineJoin ( LineJoin: TLineJoinStyle );
C++ 語法：
void __fastcall SetLineJoin ( TLineJoinStyle LineJoin);
描述：
line join style 會指定 stroked paths 的角落所使用的形狀
數值意義
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ljMiterJoin |
Miter join。兩個 segments 的 stroke 外緣會延伸 until they meet at an angle, as in a picture frame. |
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ljRoundJoin |
Round join. A circle with a diameter equal to the line width is drawn around 兩個 segments 相交的位置會被填滿，產生圓角 corner.
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ljBevelJoin |
Bevel join。兩個 segments 以 butt caps 結束，且 segments 端點外側形成的 notch 會被填滿 is filled with a triangle.
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