Setting colors for individual LEDs on Pixel Kit

[murilopolese]

In both implementations for "streaming frame" (python and nodejs), what the communitysdk does is to encode and send a list of 128 color values: One for each LED.

This list is a one dimensional representation of a two dimensional matrix of LEDs so to set the color of an LED by the x and y coordinate we need to convert a pair of coordinates (x, y) into an index in the unidimensional list.

The math is not complicated, for example if you want to set this color to red (#ff0000) all you have to do is to set a value in the frame array:

index = (x * 16) + y
frame[index] = '#ff0000'
# stream frame here

It would be great to have a method inside the communitysdk to solve this issue and/or an example on how to do this calculation.

[mexitalian]

Have started work on this, it is working with example included.
Going to write the unit tests, would love some feedback.
Can see changes to retailpixel.py → here