Forest fire

fastgraphics

graphsize 600,600

font "Arial", 20,100

dim cell(101,101)

cell[50,50]=2

burned = 1

Rem probabilitity to catch fire

p=.3

for turn = 1 to 1000

For x = 2 to 99

For y = 2 to 99

if cell[x-1,y]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x,y-1]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x,y+1]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x+1,y]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x-1,y-1]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x-1,y+1]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x+1,y-1]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x+1,y+1]=2 and cell[x,y]=0 and rand < p then cell[x,y]=3

if cell[x,y]=3 then burned = burned + 1

next y

next x

For x = 2 to 99

For y = 2 to 99

if cell[x,y]=0 then color green

if cell[x,y]=1 then color darkorange

if cell[x,y]=2 then color red
if cell[x,y]=3 then color yellow

if cell[x,y]>1 then cell[x,y]=cell[x,y]-1

rect 6*x,6*y,6,6

next y

next x

color blue

Text 10,10,"Cicle="+turn+" % burned trees=" +(burned/100)

refresh

next turn