facexy
facexy makes a turtle change its direction (heading) to point towards a given coordinate (x,y). For example, ask turtles [ facexy 0 0 ] turns all turtles in a model to face the center of the model.
Things to keep in mind when using facexy:
facexydoesn't change a turtle's position, only its heading.- If a turtle is already on the given point (x, y), it will not change its heading.
In the model example below, there are some fish and a single patch of food. When the add food button is clicked, we change the pcolor of the patch at (3, -3) to white, which indicates a food and we ask the fish to look at this coordinate in order to indicate that they turn to the food.
Try it Yourself
xxxxxxxxxx17
1
to setup2
clear-all3
create-turtles 20 [4
set shape "fish"5
setxy random-xcor random-ycor6
]7
reset-ticks8
end9
10
to add-food11
ask patch 3 -3 [12
set pcolor white13
]14
ask turtles [15
facexy 5 -516
]17
endWhat's next?
Once you mastered the facexy primitive, don't stop there. Check out the resources below to improve your NetLogo skills.
