doc Simple game example
doc based on the popular Sokoban
doc graphics taken from Rocks'n'Diamonds


// Initialize the window, load the sprites and put up the canvas
window open 100,100 to 484,484, "Win", "Simple Sokoban Example"
window set "Win", "flags", "not-zoomable, not-h-resizable, not-v-resizable"

bitmap 32,32, "wall"
err = draw image 0,0 to 31,31, "img/wall.png", "wall"
bitmap 32,32, "front1"
err = err + draw image 0,0 to 31,31, "img/front.png", "front1"
bitmap 32,32, "bulb"
err = err + draw image 0,0 to 31,31, "img/bulb.png", "bulb"
bitmap 32,32, "target"
err = err + draw image 0,0 to 31,31, "img/target.png", "target"
bitmap 32,32, "final"
err = err + draw image 0,0 to 31,31, "img/final.png", "final"
bitmap 32,32, "background"
draw set "highcolor", 0,0,0, "background"
draw rect 0,0 to 31,31, "background"

if(err>0) then
	alert "Could not load images", "Ok", "stop"
	window close "Win"
	exit(1)
endif

option set "Win", "focus", true

canvas 0,0 to 384,384, "Canvas", "Win"

draw set "highcolor", 0,0,0, "Canvas"
draw rect 0,0 to 384,384, "Canvas"

// Read in the demo level and show it
dim levelline$(12)
for i=1 to 12 
	read levelline$(i)
	for j = 1 to 12
		switch(mid$(levelline$(i), j, 1))
			case " "
				draw bitmap x,y, "background", "copy", "Canvas"
				break
			case "w"
				draw bitmap x,y, "wall", "copy", "Canvas"
				break
			case "b"
				draw bitmap x,y, "bulb", "copy", "Canvas"
				break
			case "t"
				draw bitmap x,y, "target", "copy", "Canvas"
				break
			case "s"
				draw bitmap x,y, "front1", "alpha", "Canvas"
				mapx = j
				mapy = i
				mid$(levelline$(i), j, 1) = " "
				break
		end switch
		x = x + 32
	next j
	x = 0
	y = y + 32
next i

playerx = (mapx-1)*32
playery = (mapy-1)*32

// soundplay "rhythmloop.wav", true

// handle the movements
while(not quitting)
	key$ = keyboard message$("Win")
	switch(key$)
		case "down"
			if(instr(" t", mid$(levelline$(mapy+1), mapx, 1))) then
				// soundplay "base.wav", false
				WalkDown()
			elseif(instr("bf", mid$(levelline$(mapy+1), mapx, 1)) and instr(" t", mid$(levelline$(mapy+2), mapx,1))) then
				PushDown()
			endif
			sleep 0.10
			break
		case "up"
			if(instr(" t", mid$(levelline$(mapy-1), mapx, 1))) then
				// soundplay "base.wav", false
				WalkUp()
			elseif(instr("bf", mid$(levelline$(mapy-1), mapx, 1)) and instr(" t", mid$(levelline$(mapy-2), mapx,1))) then
				PushUp()
			endif
			sleep 0.10
			break
		case "left"
			if(instr(" t", mid$(levelline$(mapy), mapx-1, 1))) then
				// soundplay "base.wav", false
				WalkLeft()
			elseif(instr("bf", mid$(levelline$(mapy), mapx-1, 1)) and instr(" t", mid$(levelline$(mapy), mapx-2,1))) then
				PushLeft()
			endif
			sleep 0.10
			break
		case "right"
			if(instr(" t", mid$(levelline$(mapy), mapx+1, 1))) then
				// soundplay "base.wav", false
				WalkRight()
			elseif(instr("bf", mid$(levelline$(mapy), mapx+1, 1)) and instr(" t", mid$(levelline$(mapy), mapx+2,1))) then
				PushRight()
			endif
			sleep 0.10
			break
		case "esc"
			quitting = true
			break
	end switch
	m$ = message$
	if(m$ = "Win:_QuitRequested|" or m$ = "_QuitRequested") quitting = true
wend

window close "Win"

sub WalkDown()
	mapy = mapy + 1
	playery = playery + 32
	draw bitmap playerx, playery, "front1","alpha", "Canvas"
	if(mid$(levelline$(mapy-1), mapx,1) = " ") then
		draw bitmap playerx, playery-32, "background","copy", "Canvas"
	elseif(mid$(levelline$(mapy-1), mapx,1) = "t") then
		draw bitmap playerx, playery-32, "target","copy", "Canvas"
	elseif(mid$(levelline$(mapy-1), mapx,1) = "f") then
		draw bitmap playerx, playery-32, "final","copy", "Canvas"
	endif
	return
end sub

sub WalkUp()
	mapy = mapy - 1
	playery = playery - 32
	draw bitmap playerx, playery, "front1","alpha", "Canvas"
	if(mid$(levelline$(mapy+1), mapx,1) = " ") then
		draw bitmap playerx, playery+32, "background","copy", "Canvas"
	elseif(mid$(levelline$(mapy+1), mapx,1) = "t") then
		draw bitmap playerx, playery+32, "target","copy", "Canvas"
	elseif(mid$(levelline$(mapy+1), mapx,1) = "f") then
		draw bitmap playerx, playery+32, "final","copy", "Canvas"
	endif
	return
end sub

sub WalkLeft()
	mapx = mapx - 1
	playerx = playerx - 32
	draw bitmap playerx, playery, "front1","alpha", "Canvas"
	if(mid$(levelline$(mapy), mapx+1,1) = " ") then
		draw bitmap playerx+32, playery, "background","copy", "Canvas"
	elseif(mid$(levelline$(mapy), mapx+1,1) = "t") then
		draw bitmap playerx+32, playery, "target","copy", "Canvas"
	elseif(mid$(levelline$(mapy), mapx+1,1) = "f") then
		draw bitmap playerx+32, playery, "final","copy", "Canvas"
	endif
	return
end sub

sub WalkRight()
	mapx = mapx + 1
	playerx = playerx + 32
	draw bitmap playerx, playery, "front1","alpha", "Canvas"
	if(mid$(levelline$(mapy), mapx-1,1) = " ") then
		draw bitmap playerx-32, playery, "background","copy", "Canvas"
	elseif(mid$(levelline$(mapy), mapx-1,1) = "t") then
		draw bitmap playerx-32, playery, "target","copy", "Canvas"
	elseif(mid$(levelline$(mapy), mapx-1,1) = "f") then
		draw bitmap playerx-32, playery, "final","copy", "Canvas"
	endif
	return
end sub

sub PushDown()
	local t$

	t$ = mid$(levelline$(mapy+1), mapx, 1)
	if(t$ = "b") then
		mid$(levelline$(mapy+1), mapx, 1) = " "
		draw bitmap playerx,playery+32, "background", "copy", "Canvas"
	else
		mid$(levelline$(mapy+1), mapx, 1) = "t"
		draw bitmap playerx,playery+32, "target", "copy", "Canvas"
	endif
	t$ = mid$(levelline$(mapy+2), mapx, 1)
	if(t$ = " ") then
		mid$(levelline$(mapy+2), mapx, 1) = "b"
		draw bitmap playerx,playery+64, "bulb", "copy", "Canvas"
		// soundplay "roehr.wav", false 
	else
		mid$(levelline$(mapy+2), mapx, 1) = "f"
		draw bitmap playerx,playery+64, "final", "copy", "Canvas"
		// soundplay "pong.wav", false
	endif
	WalkDown()
	CheckFinished()
	return
end sub

sub PushUp()
	local t$

	t$ = mid$(levelline$(mapy-1), mapx, 1)
	if(t$ = "b") then
		mid$(levelline$(mapy-1), mapx, 1) = " "
		draw bitmap playerx,playery-32, "background", "copy", "Canvas"
	else
		mid$(levelline$(mapy-1), mapx, 1) = "t"
		draw bitmap playerx,playery-32, "target", "copy", "Canvas"
	endif
	t$ = mid$(levelline$(mapy-2), mapx, 1)
	if(t$ = " ") then
		mid$(levelline$(mapy-2), mapx, 1) = "b"
		draw bitmap playerx,playery-64, "bulb", "copy", "Canvas"
		// soundplay "roehr.wav", false 
	else
		mid$(levelline$(mapy-2), mapx, 1) = "f"
		draw bitmap playerx,playery-64, "final", "copy", "Canvas"
		// soundplay "pong.wav", false
	endif
	WalkUp()
	CheckFinished()
	return
end sub

sub PushLeft()
	local t$

	t$ = mid$(levelline$(mapy), mapx-1, 1)
	if(t$ = "b") then
		mid$(levelline$(mapy), mapx-1, 1) = " "
		draw bitmap playerx-32,playery, "background", "copy", "Canvas"
	else
		mid$(levelline$(mapy), mapx-1, 1) = "t"
		draw bitmap playerx-32,playery, "target", "copy", "Canvas"
	endif
	t$ = mid$(levelline$(mapy), mapx-2, 1)
	if(t$ = " ") then
		mid$(levelline$(mapy), mapx-2, 1) = "b"
		draw bitmap playerx-64,playery, "bulb", "copy", "Canvas"
		// soundplay "roehr.wav", false
	else
		mid$(levelline$(mapy), mapx-2, 1) = "f"
		draw bitmap playerx-64,playery, "final", "copy", "Canvas"
		// soundplay "pong.wav", false
	endif
	WalkLeft()
	CheckFinished()
	return
end sub

sub PushRight()
	local t$

	t$ = mid$(levelline$(mapy), mapx+1, 1)
	if(t$ = "b") then
		mid$(levelline$(mapy), mapx+1, 1) = " "
		draw bitmap playerx+32,playery, "background", "copy", "Canvas"
	else
		mid$(levelline$(mapy), mapx+1, 1) = "t"
		draw bitmap playerx+32,playery, "target", "copy", "Canvas"
	endif
	t$ = mid$(levelline$(mapy), mapx+2, 1)
	if(t$ = " ") then
		mid$(levelline$(mapy), mapx+2, 1) = "b"
		draw bitmap playerx+64,playery, "bulb", "copy", "Canvas"
		// soundplay "roehr.wav", false 
	else
		mid$(levelline$(mapy), mapx+2, 1) = "f"
		draw bitmap playerx+64,playery, "final", "copy", "Canvas"
		// soundplay "pong.wav", false
	endif
	WalkRight()
	CheckFinished()
	return
end sub

sub CheckFinished()
	local i
	for i = 1 to 12
		if(instr(levelline$(i), "b")) return
	next i
	// soundplay "halloffame.wav", false
	alert "Solved! This was too easy ;)", "Ok", "info"
	quitting = true
	return
end sub

data "   ww       "
data "wwwwww  www "
data "wtt  w wwsww"
data "wtt  www   w"
data "wtt     bb w"
data "wtt  w w b w"
data "wttwww w b w"
data "wwww b wb  w"
data "   w  bw b w"
data "   w b  b  w"
data "   w  ww   w"
data "   wwwwwwwww"