Utils.modulate(value, [a, a], [b, b], limit)

Translates a number between two ranges. When you enable limit, it will never return a value outside of the b range. The default value for limit is false.
译：在两个范围之间转换一个数字。当您启用限制时，它将永远不会返回一个值以外的“B”的范围内。限制的默认值是“假”。

Arguments（参数）

1. value — A variable, representing the input. 译：一个变量，表示输入。
2. [a, a] — The first range of two numbers. 译：两个数的第一个范围。
3. [b, b] — The second range of two numbers. 译：两个数的第二范围。
4. limit — A boolean, set to false by default. (Optional) 译：一个布尔值，默认设置为假。（可选）

print Utils.modulate(0.5, [0, 1], [0, 100])
# Output: 50 

print Utils.modulate(1, [0, 1], [0, 100])
# Output: 100

You can think of modulate as a way to convert numbers between different scales. Like going from Celcius to Farenheit, or Kilometers to Miles.
译：你可以认为调制是一种在不同尺度间转换数字的方法。喜欢从摄氏度到华氏或公里，英里。

# Convert to Celsius/Farenheit 
Utils.modulate(celcius, [0, 100], [32, 212])

It's also useful for creating parallax effects on scroll. For example, you can move a layer from 0-10, when scrolling from 0-100.
译：它也有助于创建滚动的视差效果。例如，你可以移动一层 0-10 ，滚动时从 0-100。

scroll = new ScrollComponent
    scrollHorizontal: false

layerA = new Layer
    x: 100

# Modulate the scrolling distance 
scroll.on Events.Move, ->
    y = Utils.modulate(scroll.scrollY, [0,100], [0,10])
    layerA.y = y