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-- File: LoopPointTool.cdl
-- Created: Mon Mar 9 16:55:09 1992
-- Author: Isabelle GRIGNON
-- <isg@phobox>
---Copyright: Matra Datavision 1992
deferred generic class LoopPointTool from IntWalk
(LoopPoint as any)
---Purpose: template class to describe the necessary ressources
-- for a point usedas a starting point for a marching
-- algorithm.
-- The 'marching algorithm' determines the intersection
-- between an implicit surface and a parametrized surface.
-- these point are inside the surface not on the boundaries.
uses Pnt from gp,
Vec from gp,
Dir2d from gp
is
Value3d(myclass; PStart: LoopPoint)
---Purpose: Returns the 3d coordinates of the starting point.
returns Pnt from gp;
Value2d(myclass; PStart: LoopPoint; U, V: out Real from Standard);
---Purpose: Returns the <U,V> parameters which are associated
-- with <P>
-- it's the parameters which start the marching algorithm
Direction3d(myclass; PStart: LoopPoint)
---Purpose: returns the tangent at the intersectin in 3d space
-- associated to <P>
returns Vec from gp;
Direction2d(myclass; PStart: LoopPoint)
---Purpose: returns the tangent at the intersectin in the
-- parametric space of the parametrized surface.This tangent
-- is associated to the value2d
returns Dir2d from gp;
end LoopPointTool;
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