Shoelace formula for polygonal area: Difference between revisions
Shoelace formula for polygonal area (view source)
Revision as of 13:33, 30 September 2020
, 3 years agoAdded Wren
m (→{{header|Phix}}: alt) |
(Added Wren) |
||
Line 1,714:
<pre>Given a polygon with vertices [(3, 4), (5, 11), (12, 8), (9, 5), (5, 6)],
its area is 30.</pre>
=={{header|Wren}}==
<lang ecmascript>var shoelace = Fn.new { |pts|
var area = 0
for (i in 0...pts.count-1) {
area = area + pts[i][0]*pts[i+1][1] - pts[i+1][0]*pts[i][1]
}
return (area + pts[-1][0]*pts[0][1] - pts[0][0]*pts[-1][1]).abs / 2
}
var pts = [ [3, 4], [5, 11], [12, 8], [9, 5], [5, 6] ]
System.print("The polygon with vertices at %(pts) has an area of %(shoelace.call(pts)).")</lang>
{{out}}
<pre>
The polygon with vertices at [[3, 4], [5, 11], [12, 8], [9, 5], [5, 6]] has an area of 30.
</pre>
=={{header|zkl}}==
| |||