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/* RCSid $Id: cone.h,v 2.6 2003/06/27 06:53:21 greg Exp $ */
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/*
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* cone.h - header file for cones (cones, cylinders, rings, cups, tubes).
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*
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* Storage of arguments in the cone structure is a little strange.
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* To save space, we use an index into the real arguments of the
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* object structure through ca. The indices are for the axis
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* endpoints and radii: p0, p1, r0 and r1.
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*
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* 2/12/86
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*/
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#ifndef _RAD_CONE_H_
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#define _RAD_CONE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct cone {
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RREAL *ca; /* cone arguments (o->oargs.farg) */
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char p0, p1; /* indices for endpoints */
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char r0, r1; /* indices for radii */
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FVECT ad; /* axis direction vector */
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RREAL al; /* axis length */
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RREAL sl; /* side length */
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RREAL (*tm)[4]; /* pointer to transformation matrix */
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} CONE;
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#define CO_R0(co) ((co)->ca[(int)((co)->r0)])
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#define CO_R1(co) ((co)->ca[(int)((co)->r1)])
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#define CO_P0(co) ((co)->ca+(co)->p0)
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#define CO_P1(co) ((co)->ca+(co)->p1)
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extern CONE *getcone(OBJREC *o, int getxf);
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extern void freecone(OBJREC *o);
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extern void conexform(CONE *co);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_CONE_H_ */
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