patches-own [ elevation ; elevation of the patch ] globals [ highest ; maximum patch elevation lowest ; minimum patch elevation d ; distance direction ; direction in which walker is looking height ; elevation where walker is walks ; number of climbs and descents x ; distance input to plot ] to setup-patches ; creates a terrain of ca ; random elevations ask patches [set elevation (random 10000) ; A slider variable 'smoothness' ] ; sets how rough the terrain becomes repeat smoothness[diffuse elevation 1.0 ] ; during diffusion of 'elevation'. ask patches [set pcolor scale-color brown elevation 10000 1000 ; colors general ground ] set highest max values-from patches [elevation] set lowest min values-from patches [elevation] ask patches [if (elevation > (highest - 400)) ; colors hills [set pcolor grey ] if (elevation > (highest - topping)) ; colors tops of hills [set pcolor 7 ] if (elevation < (lowest + 300)) ; colors valleys [set pcolor green ] ] ; below:- colors one highest patch ; in each quadrant set pcolor-of max-one-of patches with [(pxcor > 0) and (pxcor != 50) and (pycor > 0) and (pycor != 50)][elevation] 7.1 set pcolor-of max-one-of patches with [(pxcor < 0) and (pxcor != -50) and (pycor > 0) and (pycor != 50)][elevation] 7.1 set pcolor-of max-one-of patches with [(pxcor > 0) and (pxcor != 50) and (pycor < 0) and (pycor != -50)][elevation] 7.1 set pcolor-of max-one-of patches with [(pxcor < 0) and (pxcor != -50) and (pycor < 0) and (pycor != -50)][elevation] 7.1 end to setup clear-marks clear-plot ct crt 1 ask turtle 0 [set color blue setxy 0 0 set heading random 360 set direction heading set height elevation-of patch-here set d 0 set walks 0 set x 0 ] end to go if (walks = 8) or (height = 0)[stop] if (walks = 0) or (walks = 2) or (walks = 4) or (walks = 6)[climb] if (walks = 1) or (walks = 3) or (walks = 5) or (walks = 7)[descend] end to climb ask turtle 0 [ifelse (d > 140) ; limits distance of look or (abspx = 50) or (abspy = 50) ; and stops wrap [increment-heading ; increments direction of look ] [ifelse (color-ahead = 7.1) ; looks for hilltop patch color [walk print height wait 1 ; walks towards patch of that color stamp white set walks walks + 1 ; also stamps mark on arrival ] [increment-d ; increments range of look ] ] ] end to walk repeat d [fd 1 set d (d - 1) increment-x do-plot wait 0.2] end to descend ask turtle 0 [ifelse (d > 140) ; limits distance of look or (abspx = 50) or (abspy = 50) ; and stops wrap [increment-heading ; increments direction of look ] [ifelse (color-ahead = green) and (d <= 50) ; looks for green of a valley [walk print height wait 1 ; up to distance 50 stamp yellow set walks walks + 1 ; also stamps mark on arrival ] [increment-d ] ] ] end to increment-heading ; rotates direction of look (heading) by 0.5 degree steps set d 0 ; (sets d 0 to start new distance search) set heading heading + 0.5 set direction heading ; reports direction to monitor end to-report abspx report abs pxcor-of patch-at (d * dx) (d * dy); reports absolute x cordinates end to-report abspy report abs pycor-of patch-at (d * dx) (d * dy); reports absolute y coordinates end to increment-d set d d + 1 end to-report color-ahead ; the guidance "radar" report pcolor-of patch-at (d * dx) (d * dy) end to increment-x ; sets up 'x' plot set x x + 1 end to do-plot set height elevation-of patch-here ; defines 'y' plot if (walks = 0) or (walks = 2) or (walks = 4) or (walks = 6)[set-plot-pen-color red] if (walks = 1) or (walks = 3) or (walks = 5) or (walks = 7)[set-plot-pen-color green] plotxy x height end to clear-marks ask patches [if (pcolor = white) [set pcolor 7.1] if (pcolor = yellow) [set pcolor green] ] end @#$#@#$#@ GRAPHICS-WINDOW 374 10 778 414 50 50 4.0 1 10 0 0 CC-WINDOW 132 288 306 438 Command Center SLIDER 378 418 585 451 smoothness smoothness 15.0 30.0 30.0 0.5 1 NIL BUTTON 187 10 274 58 setup / clear setup NIL 1 T OBSERVER MONITOR 282 10 360 59 highest hill highest 0 1 MONITOR 12 10 92 59 lowest valley lowest 0 1 BUTTON 100 10 180 58 setup terrain setup-patches NIL 1 T OBSERVER SLIDER 589 417 777 450 topping topping 200 350 250 1 1 NIL MONITOR 68 289 129 338 distance d 0 1 PLOT 3 60 359 287 height and cross-section of the terrain distance height 0.0 50.0 4000.0 6500.0 true false TEXTBOX 58 86 148 116 red climb\ngreen descent BUTTON 309 291 364 389 start go T 1 T OBSERVER MONITOR 4 340 63 389 direction direction 1 1 MONITOR 4 288 64 337 height height 0 1 MONITOR 69 341 128 390 NIL walks 0 1 @#$#@#$#@ HILLWALKER is a model inspired by the Tutorial Model 3 and it uses the random terrain creating code of that model, but a little modified. The sliders 'smoothness' and 'topping' plus the 'setup terrain' button create the terrain of green valleys, brown hills and grey tops. An offwhite color 7 patch appears as a 'topping' on some hills to simulate greater height --- snow if you like. Also in each quadrant of the screen there is a single patch of color 7.1, usually "invisible" being impossible to see if against offwhite. The "invisible" patch is used as the peak that the walker sees and aims for during the climb but first the walker must look around and across the terrain to find it. The walker's search begins from a random heading but the look around proceeds clockwise. The 'climb' procedure uses sub-procedures 'increment-heading', 'increment-distance', 'color-ahead' and 'walk'. The 'setup / clear' button followed by the 'start' button runs these procedures which starts with the walker in the center of the display. The walker will walk to the top of one hill and mark the hilltop white before descending to a nearby valley where it marks yellow. The walking continues to three more hilltops and valleys. Each sector counts as a walk, 8 in all. The descent to a valley procedure is similar to the climb but looks for a valley closeby up to distance 50. The plot shows the profile of the climbs in red and the descents in green. If a terrain proves to be particularly interesting, the walker may be returned to the display center and the model may be cleared of plots and marks by the 'setup / clear' button. Then the model may be run again using the 'start' button. The model produces a print of the heights of the 8 marks in the Command Center. The work was first done to investigate a "guidance procedure" for NetLogo. The procedures include code to avoid wrap. It is possible that models such as this may have some value in sharing procedures among the NetLogo Users and for this reason it is offered. The Author Derek Rush may be contacted by Email at derekrush@beeb.net 10th June 2002 @#$#@#$#@ default true 0 Polygon -7566196 true true 150 5 40 250 150 205 260 250 arrow true 0 Polygon -7566196 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150 box true 0 Polygon -7566196 true true 45 255 255 255 255 45 45 45 spacecraft true 0 Polygon -7566196 true true 150 0 180 135 255 255 225 240 150 180 75 240 45 255 120 135 thin-arrow true 0 Polygon -7566196 true true 150 0 0 150 120 150 120 293 180 293 180 150 300 150 turtle true 0 Polygon -7566196 true true 138 75 162 75 165 105 225 105 225 142 195 135 195 187 225 195 225 225 195 217 195 202 105 202 105 217 75 225 75 195 105 187 105 135 75 142 75 105 135 105 person false 0 Circle -7566196 true true 155 20 63 Rectangle -7566196 true true 158 79 217 164 Polygon -7566196 true true 158 81 110 129 131 143 158 109 165 110 Polygon -7566196 true true 216 83 267 123 248 143 215 107 Polygon -7566196 true true 167 163 145 234 183 234 183 163 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