ref: d010b87b1814a3bf4df3f13d0c4131fbd885b270
dir: /sys/src/games/mahjongg/logic.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <event.h> #include "mahjongg.h" Click NC = { -1, 0, 0, }; Click Cl(int d, int x, int y) { return (Click){d, x, y}; } int eqcl(Click c1, Click c2) { return c1.d == c2.d && c1.x == c2.x && c1.y == c2.y; } int freeup(Click c) { if(c.d == Depth -1 || (level.board[c.d+1][c.x][c.y].which == None && level.board[c.d+1][c.x+1][c.y].which == None && level.board[c.d+1][c.x][c.y+1].which == None && level.board[c.d+1][c.x+1][c.y+1].which == None)) return 1; return 0; } int freeleft(Click c) { if(c.x == 0 || (level.board[c.d][c.x-1][c.y].which == None && level.board[c.d][c.x-1][c.y+1].which == None)) return 1; return 0; } int freeright(Click c) { if(c.x == Lx-2 || (level.board[c.d][c.x+2][c.y].which == None && level.board[c.d][c.x+2][c.y+1].which == None)) return 1; return 0; } int isfree(Click c) { return (freeleft(c) || freeright(c)) && freeup(c); } Click cmatch(Click c, int dtop) { Click lc; lc.d = dtop; do { for(lc.y = 0; lc.y < Ly; lc.y++) for(lc.x = 0; lc.x < Lx; lc.x++) if(level.board[lc.d][lc.x][lc.y].which == TL && isfree(lc) && !eqcl(c, lc) && level.board[c.d][c.x][c.y].type == level.board[lc.d][lc.x][lc.y].type) return lc; } while(--lc.d >= 0); return NC; } Brick * bmatch(Click c) { Click lc; lc = cmatch(c, Depth - 1); if(lc.d == -1) return nil; else return &level.board[lc.d][lc.x][lc.y]; } int canmove(void) { Click c; for(c.d = Depth - 1; c.d >= 0; c.d--) for(c.y = 0; c.y < Ly; c.y++) for(c.x = 0; c.x < Lx; c.x++) if(level.board[c.d][c.x][c.y].which == TL && isfree(c) && bmatch(c) != nil) return 1; return 0; }