WS2812B (neopixel) and Graphics lib: custom matrix configuration

Well, there is a solution in Espruino to handle multiple NxN+NxN plates

// connected to a 4x4 neopixel plate (x,y)=(0-3,0-3)
//var leds = Graphics.createArrayBuffer(4,4,24); 

// connect to four noepixel plates (x,y)=(0-4,0-15)
var npp = Graphics.createArrayBuffer(4,16,24);

// horizontal (x,y)= (0-15,0-4)
npp.setRotation(1,false);