Changes between Version 16 and Version 17 of FDORfc59


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Timestamp:
Apr 10, 2011, 4:23:06 PM (13 years ago)
Author:
gregboone
Comment:

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  • FDORfc59

    v16 v17  
    11851185Question:
    11861186
    1187 What if we change the proposal to derive FdoICircleSegment directly from FdoICurveAbstract, in the process renaming FdoICircleSegment to be FdoICircle.  To me, this has some merit, since as currently described, a circle must be closed and cannot be combined with any other ArcSegment Types to form complex curve strings. They can only stand alone, and wrapping it in a CurveString seems wasteful. If a user wished to define a non-closed circle, they would use ICircularArcSegment. 
     1187What if we change the proposal to derive FdoICircleSegment directly from FdoICurveAbstract, in the process renaming FdoICircleSegment to be FdoICircle.  To me, this has some merit, since as currently described, a circle must be closed and cannot be combined with any other !ArcSegment Types to form complex curve strings. They can only stand alone, and wrapping it in a !CurveString seems wasteful. If a user wished to define a non-closed circle, they would use ICircularArcSegment. 
    11881188
    11891189Response:
    11901190
    1191 The FdoICircle may be something of a hard sell. In OGC, Circle extends Arc, which extends ArcString, which extends CurveSegment, which implements GenericCurve.
     1191The FdoICircle may be something of a hard sell. In OGC, Circle extends Arc, which extends !ArcString, which extends !CurveSegment, which implements !GenericCurve.
    11921192
    11931193== Can ICircularArcSegment Describe a Closed Circle ==
    … …  
    11951195Question:
    11961196
    1197 I’m not sure how CircularArcSegment can describe a full circle.  if the start and end points are identical, then you only have two points (start/end and mid-point), which does not define the plane of the arc for XYZ dimensionality.
     1197I’m not sure how !CircularArcSegment can describe a full circle. If the start and end points are identical, then you only have two points (start/end and mid-point), which does not define the plane of the arc for XYZ dimensionality.
    11981198
    11991199Response: