#include <u.h>#include <libc.h>#include <stdio.h>#include <libg.h>#define SCX(A) ((((A) - e1->xmin)*e1->scalex  + e1->left)+.5)#define SCY(A) ((((A) - e1->ymin)*e1->scaley + e1->bottom)+.5)#define	SCR(A) ((A)*e1->scalex+.5)#define unorm(y)	(double)(e1->sidey - y)#define	BIGINT	0x3FFFFFFF	/* a large, but valid, int */extern struct penvir {	double left, bottom;	double xmin, ymin;	double scalex, scaley;	double sidex, sidey;	double copyx, copyy;	double quantum;	double grade;	int pgap;	double pslant;	int pmode, foregr, backgr;} *e0, *e1, *esave;#define RADIAN 57.3	/* radians per degree */struct seg {	int x, y, X, Y;	char stat;};/* * Color values -- these only work with ldepth=3 & standard plan 9 color map */#define	RGB(r,g,b) (255&~(((r)<<5)|((g)<<2)|((b)>>1)))#define ZERO	RGB(0,0,0)	/* really should be ~0, but bcolor uses neg for error */#define RED	RGB(7,0,0)#define GREEN	RGB(0,7,0)#define YELLOW	RGB(7,7,0)#define BLUE	RGB(0,0,7)#define MAGENTA	RGB(7,0,7)#define CYAN	RGB(0,7,7)#define WHITE	RGB(7,7,7)/* * display parameters */int clipminx, clipminy, clipmaxx, clipmaxy;	/* clipping rectangle */int mapminx, mapminy, mapmaxx, mapmaxy;		/* centered square *//* * Prototypes */#include "../plot.h"void m_clrwin(int, int, int, int, int);void m_finish(void);void m_initialize(char *);int m_text(int, int, char *, char *, int, int, int);void m_vector(int, int, int, int, int);void m_swapbuf(void);void m_dblbuf(void);int bcolor(char *);void sscpy(struct penvir *, struct penvir *);