include/base.h base header #include <assert.h>#include <errno.h>#include <fcntl.h>#include <math.h>#include <stdio.h>#include <stdlib.h>#include <stddef.h>#include <stdbool.h>#include <sys/types.h>#include <sys/stat.h>#include <unistd.h>#include <time.h>#include <string.h>#include <glib-2.0/glib.h>#include <gtk-4.0/gtk/gtk.h> struct arrow_t defines an arrow address #define EAST   0 If I'm standing on Earth (or any spinning spheroid), looking towards its North pole. #define WEST   1 #define ZENITH   2 #define NADIR   3 #define SOUTH   4 #define NORTH   5 enum { X_AXIS , Y_AXIS , Z_AXIS , N_AXIS } used by graphics.h

base header This file is part of Gem-graph.

EASTbase.h base.hEAST #define EAST   0 If I'm standing on Earth (or any spinning spheroid), looking towards its North pole. Then : X - X = EAST - WEST = red - cyan Y - Y = ZENITH - NADIR = green - magenta (fuschia) Z - Z = NORTH - SOUTH = blue - yellow x red

NADIRbase.h base.hNADIR #define NADIR   3 y magenta

NORTHbase.h base.hNORTH #define NORTH   5 z yellow

SOUTHbase.h base.hSOUTH #define SOUTH   4 z blue

WESTbase.h base.hWEST #define WEST   1 x cyan

ZENITHbase.h base.hZENITH #define ZENITH   2 y green