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Rewrote in simple language.

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Ron Hale-Evans
2016-06-13 15:47:08 -07:00
parent de293be4fc
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1 changed files with 19 additions and 12 deletions
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docs/reference/led/point.md
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@@ -1,6 +1,7 @@
# Point # Point
Get the on/off state of a LED on the [LED screen](/device/screen). Specify the LED using x, y coordinates. Find whether the LED you say on the
[LED screen](/device/screen) is on or off.
```sig ```sig
led.point(0,0); led.point(0,0);
@@ -8,30 +9,36 @@ led.point(0,0);
### Parameters ### Parameters
* x - [Number](/reference/types/number); the *x coordinate* or horizontal 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 - [Number](/reference/types/number); the *y coordinate* or vertical position (0, 1, 2, 3, 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 return `false`. If a parameter is [out of bounds](/reference/out-of-bounds) (a value
other than 0 to 4), this function will return `false`.
### Returns ### Returns
* [Boolean](/reference/types/boolean) - `true` if the LED is *on* and `false` if the LED is *off* * a [boolean](/reference/types/boolean). If it is `true`, that means the LED is on. If it is `false`, that means the LED is off.
### 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).
### Example: toggle off ### ~
If `point(1, 1)` returns `true`, then the following code turns off the LED: ### Example: Toggle off
This program turns the center LED (2, 2) off if it is already on. (If
it is already off, this program leaves it off.)
```blocks ```blocks
if (led.point(1, 1)) { if (led.point(2, 2)) {
led.unplot(1, 1) led.unplot(2, 2)
} }
``` ```
### See also ### See also
[unplot](/reference/led/unplot), [plot](/reference/led/plot), [LED screen](/device/screen), [create image](/reference/images/create-image) [unplot](/reference/led/unplot), [plot](/reference/led/plot), [LED screen](/device/screen)