-/* bspline.c */
-int bspline(int samples, int zoom_factor, int spline_order, double input[], double output[]);
-/* clip.c */
-int inside_obj(const OBJECT *obj, double x, double y, const int coord_type);
-int clipsegment(double *x1, double *y1, double *x2, double *y2, const double u, const double v);
-int clipsector(double *x1, double *y1, double *x2, double *y2, const double u, const double v);
-int clipcircle(double *x1, double *y1, double *x2, double *y2, const double cx, const double cy, const double radius, double t1, double t2);
-int cliptriangle(double *x1, double *y1, double *x2, double *y2, const double u, const double v, const int clip_xaxis);
-/* convolve.c */
-double convolve(const double f1[], const double f2[], const double dx, const int n, const int np, const int func_type);
-double convolve_both(const double f1[], const double f2[], const double dx, const int n, const int np);
-/* ctsub.c */
-void dminmax(const double array[], const int pts, double *xmin, double *xmax);
-void rotate2d(double x[], double y[], int pts, double angle);
-void xlat2d(double x[], double y[], int pts, double xoffset, double yoffset);
-void scale2d(double x[], double y[], int pts, double xfact, double yfact);
-int circle_pts(double theta);
-/* filt.c */
-double d_filtfunc(int filt_type, double x, double bw, double param, int n);
-double filter_freq(int filt_type, double u, double bw, double param);
-double a_filtfunc(int filt_type, double x, double bw, double param);
-double sinc(double x, double mult);
-double abscos_int(double u, double w);
-double *filter_generate(int filt_type, double bw, double xmin, double xmax, int n, double param, int domain, int numint);
-void image_filter_init(IMAGE *im, int domain, double bw, int filt_type, double filt_param, int opt_trace);
-/* im_draw.c */
-void image_show(IMAGE *im, int nxcell, int nycell, double densmin, double densmax, bool disp_scale);
-int image_paint(int dev, IMAGE *im, int xmin, int ymin, int nxcell, int nycell, double densmin, double densmax, bool disp_scale);
-int gs_image(GREYSCALE *gs, IMAGE *im, double densmin, double densmax, bool disp_scale);
-void paint_cscale(GREYSCALE *gs, int nx, int ny);
-GREYSCALE *gs_init(int dev, int xmin, int ymin, int nxcell, int nycell);
-void gs_pixel(GREYSCALE *gs, int x, int y, int gs_level);
-void gs_set_pos(GREYSCALE *gs, int x, int y);
-void gs_set_at_addr(GREYSCALE *gs, int gs_level);
-void gs_set_color_scale(void);
-/* image.c */
-IMAGE *image_create(const char *fname, const int nx, const int ny);
-int image_clear(IMAGE *im);
-int image_save(IMAGE *im);
-IMAGE *image_load(const char *fname);
-/* ir_vars.c */
-/* options.c */
-int opt_set_trace(const char *optarg, const char *program);
-const char *name_of_picture(const int picnum);
-int opt_set_picture(const char *optarg, const char *program);
-int opt_set_interpolation(const char *optarg, const char *program);
-const char *name_of_interpolation(int interp_type);
-int opt_set_filter(const char *optarg, const char *program);
-const char *name_of_filter(const int filter);
-int opt_set_filter_domain(const char *optarg, const char *program);
-const char *name_of_filter_domain(const int domain);
-int opt_set_backproj(const char *optarg, const char *program);
-const char *name_of_backproj(const int backproj);
-/* pic.c */
-PICTURE *select_pic(void);
-PICTURE *create_pic_from_file(const char *fname);
-PICTURE *create_pic(const int picnum);
-PICTURE *init_pic(void);
-int add_objs_kb(PICTURE *pic);
-int add_objs_file(PICTURE *pic, const char *fname);
-void addobject(PICTURE *pic, const int type, const double cx, const double cy,
- const double u, const double v, const double rot, const double atten);
-int makeobjpts(OBJECT *obj);
-void makeobjxform(OBJECT *obj);
-void calc_arc(double x[], double y[], const int pts, const double xcent, const double ycent,
- const double r, const double start, const double stop);
-void calc_ellipse(double x[], double y[], const int pts, const double u, const double v);
-OBJECT *alloc_obj(void);
-void prt_pic(PICTURE *pic);
-void show_pic(const PICTURE *pic);
-void draw_pic(const PICTURE *pic);
-/* pic2image.c */
-void pic_to_image(const PICTURE *pic, IMAGE *im, const int col_start, const int col_count,
- const int nsample, const int trace);
-/* ray.c */
-void rs_trace_showprm (const char *label, const char *fmt, int row, int color, ...);
-DETECTOR *detect_create(const PICTURE *pic, int ndet, int nview, int nsample, const double rot_anglen);
-void detect_free(DETECTOR *det);
-int raysum_collect(RAYSUM *rs, const DETECTOR *det, const PICTURE *pic, const int start_view,
- const int trace, const int unit_pulse);
-void rayview(const PICTURE *pic, DETARRAY *darray, const DETECTOR *det,
- const double xd1, const double yd1, const double xd2, const double yd2,
- const double xs1, const double ys1, const double xs2, const double ys2, const int unit_pulse);
-double calc_rsum(const PICTURE *pic, const double x1, const double y1, const double x2, const double y2);
-double calc_objsum(const OBJECT *obj, const double x1, const double y1, const double x2, const double y2);
-int clipobj(const OBJECT *obj, double *x1, double *y1, double *x2, double *y2);
-/* rayio.c */
-RAYSUM *raysum_create(const char *fname, const int nview, const int ndet);
-RAYSUM *raysum_create_from_det(const char *fname, const DETECTOR *det);
-RAYSUM *raysum_open(const char *filename);
-void raysum_alloc_views(RAYSUM *rs);
-void raysum_free(RAYSUM *rs);
-int raysum_is_open(RAYSUM *rs);
-int raysum_close(RAYSUM *rs);
-int raysum_read_header(RAYSUM *rs);
-int raysum_write_header(RAYSUM *rs);
-int raysum_read(RAYSUM *rs);
-int raysum_write(RAYSUM *rs);
-DETARRAY *detarray_alloc(const int n);
-void detarray_free(DETARRAY *darray);
-int detarray_read(RAYSUM *rs, DETARRAY *darray, const int view_num);
-int detarray_write(RAYSUM *rs, const DETARRAY *darray, const int view_num);
-int raysum_print(const RAYSUM *rs);
-/* phantom.c */
-void herm_head(PICTURE *pic);
-void row_head(PICTURE *pic);
-void row_bord_head(PICTURE *pic);
-/* xform.c */
-void indent_mtx2(GRFMTX_2D m);
-void xlat_mtx2(GRFMTX_2D m, const double x, const double y);
-void scale_mtx2(GRFMTX_2D m, const double sx, const double sy);
-void rot_mtx2(GRFMTX_2D m, const double theta);
-void mult_mtx2(GRFMTX_2D m1, GRFMTX_2D m2, GRFMTX_2D result);
-void xform_mtx2(const GRFMTX_2D m, double *x, double *y);