Added sokoban WIP to demos

demos/sokoban.lua

@@ -0,0 +1,121 @@
+FLOOR = 0
+GOAL = 1
+BOX = 2
+PLAYER = 4
+WALL = 7
+
+function init()
+    mode(2)
+    level=1
+    player={}
+    init_level()
+end
+
+function init_level()
+    update=update_level
+    load_from_string("####|# .#|#  ###|#*@  #|#  $ #|#  ###|####")
+end
+
+function load_from_string(str)
+    map={}
+    local pos=0
+    local y,x=1,1
+    local maxx=0
+    map[y] = {}
+    while pos<#str do
+        local chr = ascii(str,pos)
+        if chr == 35 then map[y][x] = WALL end
+        if chr == 64 then player.x,player.y=x,y map[y][x] = FLOOR end
+        if chr == 43 then player.x,player.y=x,y map[y][x] = GOAL end
+        if chr == 36 then map[y][x] = BOX end
+        if chr == 42 then map[y][x] = GOAL+BOX end
+        if chr == 46 then map[y][x] = GOAL end
+        if chr == 32 then map[y][x] = FLOOR end
+        if chr == 124 then
+            y=y+1
+            map[y] = {}
+            if maxx < x then maxx=x end
+            x=0
+        end
+        pos=pos+1
+        x=x+1
+    end
+    ox = flr((20-maxx)/2)
+    oy = flr((15-y)/2)
+end
+
+function update_level()
+    border(0)
+    color(1,0)
+    cls()
+    for y=1,#map do
+        for x=1,#map[y] do
+            if map[y][x] == WALL then color(4,15) print("\127",ox+x-1,oy+y-1)
+            elseif map[y][x]&BOX == BOX then color(0,6) print("\016",ox+x-1,oy+y-1)
+            elseif map[y][x] == GOAL then color(4,0) print("\144",ox+x-1,oy+y-1)
+            end
+        end
+    end
+    color(15,0) print("\248",ox+player.x-1,oy+player.y-1)
+
+    if btnp(KEY_UP) then try_move(0,-1)
+    elseif btnp(KEY_DOWN) then try_move(0,1)
+    elseif btnp(KEY_LEFT) then try_move(-1,0)
+    elseif btnp(KEY_RIGHT) then try_move(1,0)
+    end
+end
+
+function try_move(x,y)
+    if is_empty(x,y) then
+        move_player(x,y)
+    elseif is_box(x,y) and is_empty(x*2,y*2) then
+        move_box(x,y)
+    end
+end
+
+function is_empty(x,y)
+    return map[player.y+y][player.x+x] < 2
+end
+
+function is_box(x,y)
+    return map[player.y+y][player.x+x] < 4
+end
+
+function move_player(x,y)
+    player.x=player.x+x
+    player.y=player.y+y 
+end
+
+function move_box(x,y)
+    map[player.y+y*2][player.x+x*2] = map[player.y+y*2][player.x+x*2] + BOX
+    map[player.y+y][player.x+x] = map[player.y+y][player.x+x] - BOX
+    move_player(x,y)
+    check_finished()
+end
+
+function check_finished()
+    for y=1,#map do
+        for x=1,#map[y] do
+            if map[y][x] == GOAL then return end
+        end
+    end
+    init_goodjob()
+end
+
+function init_goodjob()
+    border(15)
+    update=update_goodjob
+    wait=120
+end
+
+function update_goodjob()
+    color(15,0)
+    cls()
+    print("LEVEL "..level,6,6)
+    print("GOOD JOB!",4,8)
+    wait=wait-1
+    if wait==0 then
+        level=level+1
+        init_level()
+    end
+end