35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
& Lesson 8: A random walk
|
|
|
|
& Besides colors, what can we get?
|
|
doc! (random) & Check the console to see the documentation
|
|
|
|
pc! (random (colors))
|
|
|
|
& * random distances
|
|
|
|
fd! (random (10, 50)) & walks forward a random amount between 10 and 50
|
|
|
|
& * random angles
|
|
|
|
rt! (random (-0.25, 0.25)) & turns a random amount between -0.25 and 0.25
|
|
& you can give turtle commands negative values!
|
|
& try giving `fd!` and `bk!` negative values.
|
|
|
|
& do it a random number of times:
|
|
let times = random (10, 30)
|
|
& `let` allows us to give names to values; so far we have only named functions
|
|
& let times = random (10, 30)
|
|
& ^^^ `let` is a special form; after
|
|
& ^^^^^ This is the name we're binding
|
|
& ^ `=` goes between the lhs and the rhs
|
|
& ^^^^^^^^^^^^^^^ The value of this expression is what's bound to the name
|
|
& (in this case, it's a random value between 10 and 30)
|
|
|
|
& here's our random walk:
|
|
repeat times { & repeat our random number of times
|
|
pc! (random (colors)) & a new random color
|
|
fd! (random (10, 50)) & a new random distance
|
|
rt! (random (-0.3, 0.3)) & a new random turn
|
|
}
|
|
|