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/* Copyright (c) 1988 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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/* |
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* view.h - header file for image generation. |
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* |
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* 9/19/88 |
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*/ |
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/* view types */ |
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#define VT_PER 'v' /* perspective */ |
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#define VT_PAR 'l' /* parallel */ |
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typedef struct { |
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int type; /* view type */ |
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FVECT vp; /* view origin */ |
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FVECT vdir; /* view direction */ |
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FVECT vup; /* view up */ |
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double horiz; /* horizontal view size */ |
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double vert; /* vertical view size */ |
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double hoff; /* horizontal image offset */ |
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double voff; /* vertical image offset */ |
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FVECT hvec; /* computed horizontal image vector */ |
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FVECT vvec; /* computed vertical image vector */ |
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double hn2; /* DOT(hvec,hvec) */ |
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double vn2; /* DOT(vvec,vvec) */ |
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} VIEW; /* view parameters */ |
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extern VIEW stdview; |
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extern char *setview(); |
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extern double sqrt(); |
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#define viewaspect(v) sqrt((v)->vn2/(v)->hn2) |
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#define STDVIEW {VT_PER,0.,0.,0.,0.,1.,0.,0.,0.,1.,45.,45.,0.,0.} |
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#define VIEWSTR "VIEW=" |
