Convex hull: Difference between revisions
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{{out}}
<pre>Convex Hull: [(-9, -3), (-3, -9), (19, -8), (17, 5), (12, 17), (5, 19), (-3, 15)]</pre>
=={{header|EasyLang}}==
{{trans|Nim}}
<syntaxhighlight>
func orientation p[] q[] r[] .
return (q[2] - p[2]) * (r[1] - q[1]) - (q[1] - p[1]) * (r[2] - q[2])
.
proc calcConvexHull . pts[][] res[][] .
res[][] = [ ]
indMinX = 1
for i to len pts[][]
if pts[i][1] < pts[indMinX][1]
indMinX = i
.
.
p = indMinX
repeat
res[][] &= pts[p][]
q = (p + 1) mod1 len pts[][]
for i to len pts[][]
if orientation pts[p][] pts[i][] pts[q][] < 0
q = i
.
.
p = q
until p = indMinX
.
.
#
pts[][] = [ [ 16 3 ] [ 12 17 ] [ 0 6 ] [ -4 -6 ] [ 16 6 ] [ 16 -7 ] [ 16 -3 ] [ 17 -4 ] [ 5 19 ] [ 19 -8 ] [ 3 16 ] [ 12 13 ] [ 3 -4 ] [ 17 5 ] [ -3 15 ] [ -3 -9 ] [ 0 11 ] [ -9 -3 ] [ -4 -2 ] [ 12 10 ] ]
calcConvexHull pts[][] res[][]
print res[][]
</syntaxhighlight>
{{out}}
<pre>
[
[ -9 -3 ]
[ -3 -9 ]
[ 19 -8 ]
[ 17 5 ]
[ 12 17 ]
[ 5 19 ]
[ -3 15 ]
]
</pre>
=={{header|F_Sharp|F#}}==
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