geom/ints/math.go

package ints

import "math"

// Abs returns the absolute value of i.
func Abs(i int) int {
	if 0 > i {
		return -i
	}
	return i
}

// Min returns the minimum of a and b.
func Min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// Min64 returns the minimum of a and b.
func Min64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

// Max returns the maximum of a and b.
func Max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

// Max64 returns the maximum of a and b.
func Max64(a, b int64) int64 {
	if a > b {
		return a
	}
	return b
}

// Norm returns the normalized value of i (-1, 0 or 1).
func Norm(i int) int {
	if i < 0 {
		return -1
	}
	if i > 0 {
		return 1
	}
	return 0
}

// Norm64 returns the normalized value of i (-1, 0 or 1).
func Norm64(i int64) int64 {
	if i < 0 {
		return -1
	}
	if i > 0 {
		return 1
	}
	return 0
}

// SubAbs subtracts a from b and returns the absolute value of the result.
func SubAbs(a, b int) int {
	if a > b {
		return a - b
	}
	return b - a
}

// Pow returns the power of base b to the exponent e.
func Pow(b, e int) int {
	if 0 == e {
		return 1
	}
	if 1 == e {
		return b
	}
	p := b
	for e > 1 {
		p *= b
		e--
	}
	return p
}

// Pow64 returns the power of base b to the exponent e.
func Pow64(b, e int64) int64 {
	if 0 == e {
		return 1
	}
	if 1 == e {
		return b
	}
	p := b
	for e > 1 {
		p *= b
		e--
	}
	return p
}

// Sqrt returns square root of n.
func Sqrt(n int) int {
	return int(math.Sqrt(float64(n)))
}

// Sqrt64 returns square root of n.
func Sqrt64(n int64) int64 {
	return int64(math.Sqrt(float64(n)))
}