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/* Copyright (c) 1986 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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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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typedef struct cone { |
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double *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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double al; /* axis length */ |
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double sl; /* side length */ |
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double (*tm)[4]; /* pointer to transformation matrix */ |
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} CONE; |
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#define CO_R0(co) ((co)->ca[(co)->r0]) |
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#define CO_R1(co) ((co)->ca[(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(); |
