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Find the intersection of two lines: Difference between revisions
Find the intersection of two lines (view source)
Revision as of 15:37, 16 September 2018
, 5 years agoAdd Swift
Thundergnat (talk | contribs) m (→{{header|C}}: Remove vanity tags) |
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Intersection point: lines are parallel
</pre>
=={{header|Swift}}==
<lang swift>struct Point {
var x: Double
var y: Double
}
struct Line {
var p1: Point
var p2: Point
var slope: Double {
guard p1.x - p2.x != 0.0 else { return .nan }
return (p1.y-p2.y) / (p1.x-p2.x)
}
func intersection(of other: Line) -> Point? {
let ourSlope = slope
let theirSlope = other.slope
guard ourSlope != theirSlope else { return nil }
if ourSlope == .nan && theirSlope != .nan {
return Point(x: p1.x, y: (p1.x - other.p1.x) * theirSlope + other.p1.y)
} else if theirSlope == .nan && ourSlope != .nan {
return Point(x: other.p1.x, y: (other.p1.x - p1.x) * ourSlope + other.p1.y)
} else {
let x = (ourSlope*p1.x - theirSlope*other.p1.x + other.p1.y - p1.y) / (ourSlope - theirSlope)
return Point(x: x, y: theirSlope*(x - other.p1.x) + other.p1.y)
}
}
}
let l1 = Line(p1: Point(x: 4.0, y: 0.0), p2: Point(x: 6.0, y: 10.0))
let l2 = Line(p1: Point(x: 0.0, y: 3.0), p2: Point(x: 10.0, y: 7.0))
print("Intersection at : \(l1.intersection(of: l2)!)")</lang>
{{out}}
<pre>Intersection at : Point(x: 5.0, y: 5.0)</pre>
=={{header|zkl}}==
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