2D Functionality

2D functionality

• An XY() function which returns the index number of the X-Y coordinate on the matrix has been added.
  • The origin (x=0,y=0) is at the top left of the display, with X axis extending to the right, Y axis toward the bottom.
  • The LED order starts from 0 at the top left, and ascends to the right on the top row.
  • 2D addressing is leds[XY(column, row)]
• A serpentine/zig-zag setting has been added to 'LED Settings'.
  • With serpentine mode enabled, the led index on every odd row (top row is row 0) is ascending from right to left, and on even rows is ascending from left to right
  • The opposite of serpentine is "progressive", where all rows are oriented in ascending order from left to right

As documented in FastLED:

Don't enable serpentine setting if your pixels are
laid out all running the same way, like this:

    0 >  1 >  2 >  3 >  4
                        |
    .----<----<----<----'
    |
    5 >  6 >  7 >  8 >  9
                        |
    .----<----<----<----'
    |
   10 > 11 > 12 > 13 > 14
                        |
    .----<----<----<----'
    |
   15 > 16 > 17 > 18 > 19

Enable serpentine setting if your pixels are
laid out back-and-forth, like this:

    0 >  1 >  2 >  3 >  4
                        |
                        |
    9 <  8 <  7 <  6 <  5
    |
    |
   10 > 11 > 12 > 13 > 14
                       |
                       |
   19 < 18 < 17 < 16 < 15

• matrixWidth and matrixHeight are new 'LED Settings'.
  • matrixWidth is the number of pixels per row.
  • matrixHeight is the number of pixels per column.
• Some existing animations (as of Jan 2021) were coded for different orientations and need to be redone to match the newly agreed to orientation described above.
  • It's likely that there will at least a minor change in animations required to support a non-rectangular or non-contiguous mapping.

XY() routine update

The dev branch has a new XY() function (thanks Sutaburosu) in FX.cpp, which supports multiple layouts.

There are 5 orientation flags as follows:

• Serpentine - A serpentine layout as described above (otherwise non-serpentine layout).
• Rowmajor - The x (or Major) value goes horizontal (otherwise vertical).
• Flipmajor - Flip the major axis, ie top to bottom (otherwise not).
• Flipminor - Flip the minor axis, ie left to right (otherwise not).
• Transpose - Swap the major and the minor axes (otherwise no swap). Don't use on non-square.

By comparison, the author's aliexpress purchased 16x16 array needs to be configured as:

Serpentine | Rowmajor | Flipmajor

Note: When an X,Y value goes out of bounds, this routine writes to an LED beyond SEGLEN, and as a result, we need to use the setPixels() routine to write to the display.

Note: Oh, and here's a simulator you can play around with to get familiar with XY() at Wokwi.