Re-maps a number from one range to another.
For example, calling map(2, 0, 10, 0, 100) returns 20. The first three arguments set the original value to 2 and the original range from 0 to 10. The last two arguments set the target range from 0 to 100. 20's position in the target range [0, 100] is proportional to 2's position in the original range [0, 10].
The sixth parameter, withinBounds, is optional. By default, map() can return values outside of the target range. For example, map(11, 0, 10, 0, 100) returns 110. Passing true as the sixth parameter constrains the remapped value to the target range. For example, map(11, 0, 10, 0, 100, true) returns 100.
示例
语法
map(value, start1, stop1, start2, stop2, [withinBounds])
参数
the value to be remapped.
lower bound of the value's current range.
upper bound of the value's current range.
lower bound of the value's target range.
upper bound of the value's target range.
constrain the value to the newly mapped range.