MarSTDv2004: CPoly Class Reference

MarSTDv2004

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CPoly Class Reference

Collaboration diagram for CPoly:

Collaboration graph
[legend]
List of all members.

Detailed Description

The polygon class defines a polygon using a DLL of edges in CW order. Polygons should be convex and defined CW to use all of the features.

Definition at line 31 of file CPoly.h.

Public Member Functions

CEdge * add (CEdge *edge)
CEdge * addHead (CEdge *edge)
CEdge * addTail (CEdge *edge)
CEdge * unlink (CEdge *edge)
void remove (CEdge *edge)
void clear ()
void copy (CPoly *poly)
CPoly * copy ()
void init ()
CSphere calculateSphere ()
int onFront (CPlane *plane)
int onBack (CPlane *plane)
CPoly * clip (CPlane *plane)
CPoly * clipFront (CPlane *plane)
void clip (CPlane *plane, CPoly *front, CPoly *back)
void clip (CPoly *poly, CPoly *inside, class CMesh *outside)
void reverseWinding ()
void triangulate (std::vector< CPoly * > *polyArray)
CPoly * unlink ()

Public Attributes

CEdge * edgeHead
 First edge in DLL.
CEdge * edgeTail
 Last edge in DLL.
int edgeCount
 Number of edges.
CPlane plane
 Plane. Uses left hand rule.
CSphere sphere
void * data
 Custom data field. Use it to store a pointer to some custom data structure. Eg to define material properties, texture, ...
CPoly * prev
 Reference to previous polygon in DLL.
CPoly * next
 Reference to next polygon in DLL.

Member Function Documentation

CEdge* CPoly::add (  CEdge *  edge  ) 
 

Links an edge to the tail.

See also:
add_tail()

CEdge* CPoly::addHead (  CEdge *  edge  ) 
 

Links an edge to the head.

See also:
add_tail()

CEdge* CPoly::addTail (  CEdge *  edge  ) 
 

Links an edge to the tail.

See also:
add_head()

CEdge* CPoly::unlink (  CEdge *  edge  ) 
 

Unlinks an edge from the DLL. Note that this does not free any memory.

See also:
remove()

void CPoly::remove (  CEdge *  edge  ) 
 

Removes an edge. This unlinks the edge and then frees it's memory. ()

void CPoly::clear (   ) 
 

Clear the DLL of edges. This will free all memory.

void CPoly::init (   ) 
 

Initializes the polygon. This will calculate the plane and edge normals. This should be done when the polygon creation has finished. If the number of edges < 3 this function will bail.

CSphere CPoly::calculateSphere (   ) 
 

Calculates a bounding sphere. The polygon is entirely contained within the bounding sphere.

Returns:
The bounding sphere.

int CPoly::onFront (  CPlane *  plane  ) 
 

Returns true if the polygon is in front of the plane, considering epsilon.

int CPoly::onBack (  CPlane *  plane  ) 
 

Returns true if the polygon is behind of the plane, considering epsilon.

CPoly* CPoly::clip (  CPlane *  plane  ) 
 

Clip the polygon by plane, returning the remaining polygon (all that is in front of the plane). FIXME: changing this to clip everything BEHIND the plane will probably affect brush code. Will have to fix it. :)

CPoly* CPoly::clipFront (  CPlane *  plane  ) 
 

Same as clip(CPlane* plane), however this removes the part that is behind the plane.

void CPoly::clip (  CPlane *  plane,
CPoly *  front,
CPoly *  back
) 
 

Clip the polygon by plane, returning both the parts that are in front and behind the plane.

void CPoly::clip (  CPoly *  poly,
CPoly *  inside,
class CMesh *  outside
) 
 

Clip the polygon by another polygon that is coplanar, possibly overlapping. out = this - poly. in = this - out. 

For instance:

++++                ++++
++---- => outside = ++    inside =   ++  poly =   ----
++----              ++               ++           ----
  ----                                            ----

CPoly* CPoly::unlink (   ) 
 

Unlinks this polygon from a DLL.

The documentation for this class was generated from the following file:
Generated on Tue Feb 8 21:59:43 2005 for MarSTDv2004 by  doxygen 1.4.1

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