letters are backwards in text example 2

[jmartens2]

same as title. how do i flip them around

[AaronLiddiment]

I imagine you matrix is not wired with the bottom left led being 0,0.
I think your first led is perhaps bottom right?
If it is you need to change the Matrix declaration to have a negative X size:
cLEDMatrix<-MATRIX_WIDTH, MATRIX_HEIGHT, MATRIX_TYPE> leds;

[jmartens2]

That’s a fast reply! Thank you I will try later today! Sent from my iPhoneOn Oct 2, 2024, at 9:51 PM, Aaron Liddiment ***@***.***> wrote: I imagine you matrix is not wired with the bottom left led being 0,0. I think your first led is perhaps bottom right? If it is you need to change the Matrix declaration to have a negative X size: cLEDMatrix<-MATRIX_WIDTH, MATRIX_HEIGHT, MATRIX_TYPE> leds; —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>

[kampaioli]

AAron, my matrix has origin in top right .
I tested Matrix declaration with negative X and Y , but the standard EFFECT does not run.
The matrix remains completely off. I think it's because the working field is "outside" the panel.
What is the correct indication for a top+right origin? And what other precautions should I take to obtain the various effects?

The only method i've found in numerous tests is with origin 0,0 and effect_scroll_ right and effect_char_down. "down" is a strange indication but it works and text normally scroll from right to left. But in this way the other effects (effect_UP and effect_down) do not work well, and the chars resume their standard direction.
Thanks in advance.
Merry Xmas.

[AaronLiddiment]

Sounds strange!
The negative sign is only used to revese the origin of that axis, it does not affect the coordinate range.
So if X was -16 the first line would still have logical leds 0 to 15, but the first physical led would be on the right instead of the left. The same is true for the Y axis.
Next comes the wiring of the lines, ZIGZAG refers to the wiring on alternate lines being reversed.
So HORIZONTAL_ZIGZAG_MATRIX the physical leds would be wired like this:
2 1 0
3 4 5
8 7 6
So VERTICAL_ZIGZAG_MATRIX the physical leds would be wired like this:
6 5 0
7 4 1
8 3 2
The aim of the Matrix code is to make 0,0 the logical led in the bottom left even when the first physical led is in another corner.
Beyond this explanation I would need to see your code and perhaps more info on what compiler / board you are using.

[kampaioli]

Aaron, first of all ... many thanks.
My matrix is, as you permit, in horizontal_zigzag. First pixel in top right corner. The first row of 50 leds branches out to the left, and second row returns to the right... doing so for 8 rows, for a total of 400 leds.
With the 6 #defines:

#define LED_PIN        5
#define COLOR_ORDER    RGB
#define CHIPSET        WS2813
#define MATRIX_WIDTH   50 
#define MATRIX_HEIGHT  8 
#define MATRIX_TYPE    HORIZONTAL_ZIGZAG_MATRIX

what I tried is putting the negative origin in ScrollingMsg.Init(&leds, leds.Width(), ScrollingMsg.FontHeight() + 1, -50, -8); but then no EFFECT_CHAR_xx produced me char oriented in the correct direction.

I use a full ESP32 board (WEMOS LOLIN32) with level shifter e one strip of WS2815 led (plus, obvious, a 12v supply 10A).
The "leds curtain" is temporarily mounted outside my balcony until after January 8th. Until then, I can change the layout.
Now, as a fallback, in the Text I'm using EFFECT_SCROLL_RIGHT EFFECT_CHAR_DOWN.
Marco.

[AaronLiddiment]

Now it makes sense... You only use the negative signs with the Matrix class so it knows the led layout and can make 0,0 the bottom left corner. So:
cLEDMatrix<-MATRIX_WIDTH, -MATRIX_HEIGHT, MATRIX_TYPE> leds;

[kampaioli]

Many thanks, Aaron.
I don't know why, but I was fixated only on the origins as parameters for the xx.init(xx) function.
And yet the instructions are clear enough.
Oh well.
Merry Christmas.