package main

import (
  "math/rand"
)

type Interval struct {
  Min float64
  Max float64
}

func (i Interval) Size() float64 {
  return i.Max - i.Min;
}

func (i Interval) Include(x float64) bool {
  return i.Min <= x && x <= i.Max;
}

func (i Interval) Surround(x float64) bool {
  return i.Min < x && x < i.Max;
}

func (i Interval) Clamp(x float64) float64 {
  if x < i.Min {
    return i.Min;
  }
  if x > i.Max {
    return i.Max;
  }
  return x;
}

func (i Interval) Sample() float64 {
  return rand.Float64() * i.Size() + i.Min;
}