slider.pointForValue(value)

Takes a value and returns the corresponding point (x) within the slider. With a slider ranging from 0 to 1, the pointForValue(0.5) will be the center of the slider. With a width of 200, this will return 100.
译：取一个值并返回滑块内的相应点（x）。一个滑块从 0 到 1 ，的pointforvalue （0.5）将滑块中心。有一个宽度为200的”，这将返回”100”。

# Create a SliderComponent 
slider = new SliderComponent
    width: 200

slider.center()

# Print the point for a value of 0.5 
print slider.pointForValue(0.5)
# Returns 100