Brownian tree: Difference between revisions
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=={{header|EasyLang}}==
[https://easylang.dev/show/#cod=dZHLboMwEEX3/oqzLoqxiahUCfIjiAUlRrVK7IjQFv6+snmkqpKFrfH1eM6dcet7PxxRaLTojaOrajKleAm7uPhvQ67IlRhMO6JkHpboKr3lkKCVqinRwlHyppQSPx+2N1gKnIDBXE0zCoCJkqFxZ+vG+PiAjvr8RP9yo+3pqnmHTQFYU5xihhSwwHR0EBmekmkpG8J5JSd3xJED2Qp+KNuOiQKFH5i3YOJURhdRXOKYDe+DaT5XvtwqPLC9eYQ42smTkgWb6QoO0/oz6EXqqtnfK/n/pWzoYT90WC7+jH6lZPMH7frTMiPBkuLin2/Xt96Y654un7QlhRS/ Run it]
<syntaxhighlight
color3 0 1 1
len f[] 200 * 200
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while i < n
repeat
x =
y =
until f[y * 200 + x + 1] <> 1
.
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xo = x
yo = y
x +=
y +=
if x < 0 or y < 0 or x >= 200 or y >= 200
break 1
Line 4,959:
world[py][px] := 1;
rect(SCALE * pred(px), SCALE * pred(py), SCALE, SCALE, white);
bumped := TRUE;
else
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until bumped;
end for;
end func;</syntaxhighlight>
Original source: [http://seed7.sourceforge.net/algorith/graphic.htm#brownian_tree]
=={{header|SequenceL}}==
'''SequenceL Code:'''<br>
Line 5,426 ⟶ 5,419:
:Pause
:RecallGDB 0</syntaxhighlight>
=={{header|Uiua}}==
Uiua Pad will show well-shaped arrays as images directly. If running locally you can uncomment the final few lines to save it as a file instead. (Running local is ~10 times faster too.)
The main move loop passes round a pair of points: here and previous position, so when we hit a set cell we can just back up one.
<syntaxhighlight lang="Uiua">
S ← 80
# Create SxS grid, and set the centre point as seed.
⍜⊡(+1)↯2⌊÷2S ↯ S_S 0
RandInt ← ⌊×⚂
RandPoint ← ([⍥(RandInt S)2])
# Update the pair to be a new adjacent [[Here] [Last]]
Move ← ⊟∵(-1+⌊RandInt 3).⊢
In ← /××⊃(≥0)(<S) # Is this point in bounds?
# Given a grid return a free point pair and that grid.
SeedPair ← ⊟.⍢(RandPoint ◌)(=1⊡) RandPoint
# Find next adjacent position, or new seed if out of bounds.
Next ← ⟨SeedPair ◌|∘⟩:⟜(In ⊢)Move
# Start from a new Seed Pair and move until you hit the tree. Add the prior pos to the tree.
JoinTree ← ⍜⊡(+1)◌°⊟⍢Next (=0⊡⊢) SeedPair
# Do it multiple times.
⍜now⍥JoinTree500
# ◌
# &ime "png"
# &fwa "BrownianTree.png"
</syntaxhighlight>
Or if you like your code terse :-)
<syntaxhighlight lang="Uiua">
S ← 80
⍜⊡(+1)↯2⌊÷2S↯S_S0
Rp ← (⊟⍥(⌊×⚂S)2)
Sd ← ⊟.⍢(Rp◌)(=1⊡) Rp
Nx ← ⟨Sd◌|∘⟩:⟜(/××⊃(≥0)(<S)⊢)⊟∵(-1+⌊×⚂3).⊢
⍜now⍥(⍜⊡(+1)◌°⊟⍢Nx(=0⊡⊢)Sd)500
</syntaxhighlight>
{{out}}
[[File:UiuaBrownianTree.png|thumb|center||Sample with higher values than provided code]]
=={{header|Visual Basic .NET}}==
Windows Forms Application.
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{{trans|Go}}
As you'd expect, not very fast so have halved Go's parameters to draw the tree in around 45 seconds.
<syntaxhighlight lang="
import "dome" for Window
import "random" for Random
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var Game = BrownianTree.new(200, 150, 7500)</syntaxhighlight>
=={{header|XPL0}}==
[[File:BrownXPL0.gif|right]]
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