struct GsCOORDINATE2 {
u_long flg;
MATRIX coord;
MATRIX workm;
GsCOORD2PARM *param;
GsCOORDINATE2 *super;
};
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Members
| flg |
Flag indicating whether coord was rewritten |
| coord |
The matrix |
| workm |
Result of multiplying this coordinate system with the WORLD coordinate
system |
| param |
Pointer for scaling, rotation and translation parameters |
| super |
Pointer to the parent coordinate system |
Explanation
GsCOORDINATE2 is defined by the matrix coord and a pointer
to the parent coordinate system.
workm retains the result of matrix multiplication in each node
of GsCOORDINATE2 from WORLD coordinates and performed by the GsGetLw()
and GsGetLs() functions. However,
workm does not store the result of matrix multiplication for a coordinate system that is directly coupled to the WORLD coordinate system.
flg is used during GsGetLw()
and GsGetLs() to omit calculations
for a node when calculations were already performed. When flg is
set to 1, calculations are omitted. When flg is set to 0, calculations
are performed. The programmer must clear this flag whenever coord
is changed otherwise the GsGetLw()
and GsGetLs() functions will not
execute properly.
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