'宣言 Protected Overrides Function GetRotateAngle( _ ByVal centerPt As Point, _ ByVal pt1 As Point, _ ByVal pt2 As Point _ ) As Single
'宣言
Protected Overrides Function GetRotateAngle( _ ByVal centerPt As Point, _ ByVal pt1 As Point, _ ByVal pt2 As Point _ ) As Single
protected override float GetRotateAngle( Point centerPt, Point pt1, Point pt2 )
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