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Rewrote in simple language

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Ron Hale-Evans 2016-06-13 12:57:42 -07:00
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docs/reference/led/plot.md
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# Plot
Turn on a LED light on the [LED screen](/device/screen). Specify which LED using x, y coordinates. Use [unplot](/reference/led/unplot) to turn a LED off.
Turn on the LED light you say on the [LED screen](/device/screen).
```sig
led.plot(0,0);
```
## ~hint
Use [unplot](/reference/led/unplot) to turn **off** an LED.
## ~
### Parameters
* x - [Number](/reference/types/number); the *x coordinate* or horizontal position (0, 1, 2, 3, 4)
* y - [Number](/reference/types/number); the *y coordinate* or vertical position (0, 1, 2, 3, 4)
* **x** is a [number](/reference/types/number) that means the horizontal spot on the LED screen (from left to right: 0, 1, 2, 3, or 4)
* **y** is a [number](/reference/types/number) that means the vertical spot on the LED screen (from top to bottom: 0, 1, 2, 3, or 4)
If a parameter is [out of bounds](/reference/out-of-bounds) (a value other than 0-4), then this function will do nothing.
If a parameter is [out of bounds](/reference/out-of-bounds) (a value
other than 0 to 4), then this function will do nothing.
### x, y coordinates?
### ~hint
The LED screen is made up of 25 LEDs arranged in a 5x5 grid. To figure out the ``x``, ``y`` coordinates, see [LED screen](/device/screen).
The LED screen is a solid square of LEDs with five LEDs on each side.
To learn more about how you number the LEDs with ``x`` and ``y``
coordinates, see [LED screen](/device/screen).
This code turns on the centre LED:
### ~
### Example: One LED
This program turns on the bottom right LED.
```blocks
led.plot(2, 2)
led.plot(4, 4)
```
### Get the LED on/off state
Use the [point](/reference/led/point) function to find out if a LED is on or off.
### Example: Square
### Example: a square
The following example uses a [for loop](/reference/loops/for) and the `plot` function to turn on the LED lights along the edge of the screen, making a square:
This program uses a [for loop](/reference/loops/for)
and the `plot` function
to make a square around the edges of the LED screen.
```blocks
for (let i = 0; i < 5; i++) {
@ -41,7 +53,13 @@ for (let i = 0; i < 5; i++) {
}
```
### ~hint
Use the [point](/reference/led/point) function to find out if an LED is
on or off.
### ~
### See also
[unplot](/reference/led/unplot), [point](/reference/led/point), [LED screen](/device/screen)