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McGeRay2d::McGeRay2d 构造函数 (McGePoint2d&, McGePoint2d&)

建构一条起点为pnt1并通过点pnt2的射线

C++
McGeRay2d(const McGePoint2d& pnt1, const McGePoint2d& pnt2);
参数 
说明 
const McGePoint2d& pnt1 
输入射线的起点 
const McGePoint2d& pnt2 
输入任意不同于pnt1的2D点 
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