data.h
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	/* RCSid $Id: data.h,v 2.7 2003/06/27 06:53:22 greg Exp $ */
	/*
	* Header for data file loading and computation routines.
	*/
	#ifndef _RAD_DATA_H_
	#define _RAD_DATA_H_
	#ifdef __cplusplus
	extern "C" {
	#endif

	#define MAXDDIM 5 /* maximum data dimensions */

	#define DATATYPE float /* single precision to save space */
	#define DATATY 'f' /* format for DATATYPE */

	typedef struct datarray {
	char name; / name of our data */
	short type; /* DATATY, RED, GRN or BLU */
	short nd; /* number of dimensions */
	struct {
	DATATYPE org, siz; /* coordinate domain */
	int ne; /* number of elements */
	DATATYPE p; / point locations */
	} dim[MAXDDIM]; /* dimension specifications */
	union {
	DATATYPE d; / float data */
	COLR c; / RGB data */
	} arr; /* the data */
	struct datarray next; / next array in list */
	} DATARRAY; /* a data array */


	extern DATARRAY getdata(char dname);
	extern DATARRAY getpict(char pname);
	extern void freedata(DATARRAY *dta);
	extern double datavalue(DATARRAY dp, double pt);


	#ifdef __cplusplus
	}
	#endif
	#endif /* _RAD_DATA_H_ */