/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * * An interval list used to map matrix elements into integers in the range 0 to * 254 representing shades of gray on a PostScript printer. The list can be given * using the -i option or can be set in the optional header that can preceed each * matrix. The list should be a comma or space separated list that looks like, * *		num1,num2, ... ,numn * * where each num is a floating point number. The list must be given in increasing * numerical order. The n numbers in the list partion the real line into 2n+1 * regions given by, * *		region1		element < num1 *		region2		element = num1 *		region3		element < num2 *		region4		element = num3 *		   .		     . *		   .		     . *		   .		     . *		region2n	element = numn *		region2n+1	element > numn * * Every number in a given region is mapped into an integer in the range 0 to 254 * and that number, when displayed on a PostScript printer using the image operator, * prints as a square filled with a gray scale that reflects the integer that was * chosen. 0 maps to black and 255 white (that's why 255 is normally omitted). * * The shades of gray chosen by the program are normally generated automatically, * but can be reassigned using the -g option or by including a grayscale line in * the optional header. The grayscale list is comma or space separated list of * integers between 0 and 255 that's used to map individual regions into arbitray * shade of gray, thus overriding the default choice made in the program. The list * should look like, * *		color1,color2, ... ,color2n+1 * * where color1 applies to region1 and color2n+1 applies to region2n+1. If less * than 2n+1 numbers are given the default assignments will be used for the missing * regions. Each color must be an integer in the range 0 to 255. * * The default interval list is given below. The default grayscale maps 254 (almost * white) into the first region and 0 (black) into the last. * */ #define DFLTILIST	"-1,0,1" /* * * The active interval list is built from an interval string and stored in an array * whose elements are of type Ilist. * */ typedef struct  {	double	val;			/* only valid in kind is ENDPOINT */	int	color;			/* gray scale color */	long	count;			/* statistics for each region */} Ilist; /* * * Non-integer function declarations. * */ char	*savestring();