# Fire (evolved version)

Model was written in NetLogo 6.3.0
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globals [ initial-trees burned-trees ;; how many trees (green patches) we started with ] breed [fires fire] ;; bright red turtles -- the leading edge of the fire breed [embers ember] to setup clear-all ;; make some green trees ask patches with [(random-float 100) < Density] [ set pcolor green ] ;; make a column of burning trees at the left-edge if Starting_point_of_fire = "Center" [ask patches [ if pxcor = 0 and pycor < 5 and pycor > 1 [ set pcolor red ] ] ] if Starting_point_of_fire = "Left side" [ask patches with [pxcor = min-pxcor] [ set pcolor red ]] ;; keep track of how many trees there are set initial-trees count patches with [pcolor = green] reset-ticks end to go ;; stop the model when done if all? patches [pcolor != red] [ stop ] ;; each burning tree (red patch) checks its 4 neighbors. ;; If any are unburned trees (green patches), change their probability ;; of igniting based on the wind direction ask patches with [pcolor = red] [ ;; ask the unburned trees neighboring the burning tree ask neighbors4 with [pcolor = green] [ let probability Propability_of_spread ;; compute the direction from you (the green tree) to the burning tree ;; (NOTE: “myself” is the burning tree (the red patch) that asked you ;; to execute commands) let direction towards myself ;; the burning tree is north of you ;; so the south wind impedes the fire spreading to you ;; so reduce the probability of spread if (direction = 0 ) [ set probability probability - South_wind_speed ] ;; the burning tree is east of you ;; so the west wind impedes the fire spreading to you ;; so reduce the probability of spread if (direction = 90 ) [ set probability probability - West_wind_speed ] ;; the burning tree is south of you ;; so the south wind aids the fire spreading to you ;; so increase the probability of spread if (direction = 180 ) [ set probability probability + South_wind_speed ] ;; the burning tree is west of you ;; so the west wind aids the fire spreading to you ;; so increase the probability of spread if (direction = 270 ) [ set probability probability + West_wind_speed ] if random 100 < probability [ set pcolor red ;; to catch on fire ;; if big jumps is on, then sparks can fly farther if Low_humidity_rates [ let target patch-at (West_wind_speed / 5) (South_wind_speed / 5) if target != nobody and [ pcolor ] of target = green [ ask target [ set pcolor red ;; to ignite the target patch ] ] ] ] ] set pcolor red - 3.5;; once the tree is burned, darken its color ] tick ;; advance the clock by one “tick” end to Spread_fire_with_mouse if mouse-down? [ ask patch mouse-xcor mouse-ycor [ set pcolor red ] display ] end ; Copyright 2006 Uri Wilensky. ; See Info tab for full copyright and license.

There is only one version of this model, created 7 months ago by Katerina Benisi.

## Attached files

File | Type | Description | Last updated | |
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Fire (evolved version).png | preview | Preview for 'Fire (evolved version)' | 7 months ago, by Katerina Benisi | Download |

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