AutoCAD Map 3D 2009 Geospatial Platform Reference

AutoCAD Map 3D Geospatial Platform API

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MgGeometry Class Reference
[MgGeometry]

Inherits MgGeometricEntity.

Inherited by MgAggregateGeometry, MgCurve, MgPoint, and MgRegion.

List of all members.

Detailed Description

MgGeometry is an abstract base class for all of the geometry types.

Remarks:
All of the geometries are constructed by calling non-static methods on an instance of MgGeometryFactory and are immutable once constructed.
Note:
The following analysis functions would throw MgGeometryException if called on an instance of MgMultiGeometry:
  1. Intersection
  2. Union
  3. Difference
  4. SymetricDifference
  5. Disjoint
  6. Touches
  7. Intersects
  8. Crosses
  9. Within
  10. Contains
  11. Overlaps
  12. Equals

Public Member Functions

virtual MgGeometry * Boundary ()
 
Remarks:

virtual MgGeometry * Buffer (double distance, MgMeasure *measure)
 Returns a geometry that represents all points whose distance from this geometric entity is less than or equal to a given distance. By default, the distance computation is done using a linear algorithm unless a custom measure is supplied.
virtual bool Contains (MgGeometry *other)
 
virtual MgGeometry * ConvexHull ()
 
Remarks:
In section 12.4.2 [JTS1.4 ] states: "The convex hull of a Geometry is the smallest convex Polygon that contains all the points in the Geometry. If the convex hull contains fewer than 3 points, a lower dimension Geometry is returned, specified as follows:

virtual bool Crosses (MgGeometry *other)
 Given 2 geometries a and b, a.Crosses(b) is true if and only if the dimension of the intersection of the interior of a and the interior of b is less than the greater of the dimension of the interior of a and the dimension of the interior of b and the intersection of a and b is neither a nor b.
virtual MgGeometry * Difference (MgGeometry *other)
 Returns a geometry that represents a point set difference between this geometric entity and another.
virtual bool Disjoint (MgGeometry *other)
 Given 2 geometries a and b, a.Disjoint(b)is true if and only if the intersection of a and b is empty.
virtual double Distance (MgGeometry *other, MgMeasure *measure)
 Returns the shortest distance between this geometry and another. By default distance computation is done using a linear algorithm unless a custom measure is supplied.
virtual bool Equals (MgGeometry *other)
 Given 2 geometries a and b, a.Equals(b) is true if the 2 geometries are spatially equal.
virtual INT32 GetGeometryType ()=0
 Gets the type of this geometry.
virtual MgGeometry * Intersection (MgGeometry *other)
 Returns a geometry that represents the point set intersection of this geometry and another.
virtual bool Intersects (MgGeometry *other)
 This is a convenience method. Given 2 geometries a and b, a.Intersects(b) is true if and only if a.Disjoint (b) is false.
virtual bool Overlaps (MgGeometry *other)
 Given 2 geometries a and b, a.Overlaps(b) is true if and only if the dimension of the interior of a equals the dimension of the interior of b equals the dimension of the intersection of the interior of a and the interior of b and the intersection of a and b is neither a nor b.
virtual MgGeometry * SymetricDifference (MgGeometry *other)
 Returns a geometry that represents the point set symmetric difference of this geometry with another.
virtual bool Touches (MgGeometry *other)
 Given 2 geometries a and b, a.Touches(b) is true if and only if the intersection of the interior of a and the interior of b is empty and the intersection of a and b is not empty.
virtual MgGeometry * Union (MgGeometry *other)
 Returns a geometry that represents the point set union of this geometry with another.
virtual bool Within (MgGeometry *other)
 Given 2 geometries a and b, a.Within(b) is true if and only if the intersection of a and b is a and the intersection of the interior of a and the interior of b is not empty.

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