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jkatayama/useful function for math

Created March 2, 2016 09:16
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math.swift
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useful function for math
### 二つの点の距離
``` swift
func distance(pointA: CGPoint, pontB: CGPoint) -> Float {
let dx: Float = abs(pointA.x - pontB.x)
let dy: Float = abs(pointA.y - pontB.y)
let dist = sqrt(dx*dx + dy*dy)
return dist
}
```
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