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Ron Hale-Evans 2016-06-30 11:53:13 -07:00
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docs/reference/pins/map.md
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# Map # Map
Re-maps a number from one range to another. That is, a value of ``from low`` would get mapped to ``to low``, a value of ``from high`` to ``to high``, values in-between to values in-between, etc. Remaps the specified value from one range to another. This function
maps the value of ``from low`` to the value of ``to low``, the value
of ``from high`` to the value of ``to high``, and intermediate values
to intermediate values.
Does not constrain values to within the range, because out-of-range values are sometimes intended and useful. The `math->clamp` function may be used either before or after this function, if limits to the ranges are desired. This function does not constrain values to the ranges, because
out-of-range values are sometimes intended and useful. If you need to
limit a range, you can use the ``Math.clamp`` function before or after
calling this function.
```sig ```sig
pins.map(0, 0, 4, 0, 1023); pins.map(0, 0, 4, 0, 1023);
@ -10,15 +16,16 @@ pins.map(0, 0, 4, 0, 1023);
### Parameters ### Parameters
* ``value``: [Number](/reference/types/number) - the value to map * ``value``: a [number](/reference/types/number) that specifies the value to map
* ``from low``: [Number](/reference/types/number) - lower bound of the origin interval * ``from low``: a [number](/reference/types/number) that specifies the lower bound of the origin interval
* ``from high``: [Number](/reference/types/number) - upper bound of the origin interval * ``from high``: a [number](/reference/types/number) that specifies the upper bound of the origin interval
* ``to low``: [Number](/reference/types/number) - lower bound of the target interval * ``to low``: a [number](/reference/types/number) that specifies the lower bound of the target interval
* ``to high``: [Number](/reference/types/number) - upper bound of the target interval * ``to high``: a [number](/reference/types/number) that specifies the upper bound of the target interval
## Example ## Example
Map the value read from the analog pin ``P0`` to an LED index between ``0`` and ``4``. This example maps the value read from the analog pin `P0` to an LED
coordinate between `0` and `4`.
```blocks ```blocks
let value1 = pins.analogReadPin(AnalogPin.P0) let value1 = pins.analogReadPin(AnalogPin.P0)