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/* RCSid $Id$ */
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/*
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* view.h - header file for image generation.
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*
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* Include after fvect.h
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* Includes resolu.h
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*/
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#include "copyright.h"
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#include "resolu.h"
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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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#define VT_ANG 'a' /* angular fisheye */
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#define VT_HEM 'h' /* hemispherical fisheye */
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#define VT_CYL 'c' /* cylindrical panorama */
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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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double vfore; /* fore clipping plane */
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double vaft; /* aft clipping plane (<=0 for inf) */
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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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#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.}, \
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45.,45.,0.,0.,0.,0., \
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{0.,0.,0.},{0.,0.,0.},0.,0.}
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#define VIEWSTR "VIEW="
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#define VIEWSTRL 5
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#ifdef NOPROTO
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extern char *setview();
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extern void normaspect();
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extern double viewray();
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extern void viewloc();
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extern void pix2loc();
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extern void loc2pix();
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extern int getviewopt();
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extern int sscanview();
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extern void fprintview();
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extern char *viewopt();
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extern int isview();
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extern int viewfile();
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#else
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extern char *setview(VIEW *v);
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extern void normaspect(double va, double *ap, int *xp, int *yp);
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extern double viewray(FVECT orig, FVECT direc, VIEW *v, double x, double y);
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extern void viewloc(FVECT ip, VIEW *v, FVECT p);
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extern void pix2loc(FLOAT loc[2], RESOLU *rp, int px, int py);
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extern void loc2pix(int pp[2], RESOLU *rp, double lx, double ly);
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extern int getviewopt(VIEW *v, int ac, char *av[]);
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extern int sscanview(VIEW *vp, char *s);
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extern void fprintview(VIEW *vp, FILE *fp);
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extern char *viewopt(VIEW *vp);
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extern int isview(char *s);
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extern int viewfile(char *fname, VIEW *vp, RESOLU *rp);
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#endif
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