show_message, text draw not show text properly

[macpit]

Show_message and text draw show text not properly:

Type of Raspberry Pi

Pi 3B

Linux Kernel version / Python

Linux raspberrypi 4.9.59-v7+ #1047 SMP Sun Oct 29 12:19:23 GMT 2017 armv7l GNU/Linux.

root@raspberrypi:~/# pip3 list|grep luma
luma.core (1.2.1)
luma.led-matrix (1.0.7)
root@raspberrypi:~/# python3 -V
Python 3.5.3

Expected behaviour

Test Code:

import time

from luma.led_matrix.device import neopixel
from luma.core.render import canvas
from luma.core.legacy import text, show_message
from luma.core.legacy.font import TINY_FONT, CP437_FONT

device = neopixel(width=60, height=10)
device.contrast(50)

def main():
    with canvas(device, dither=True) as draw:
        text(draw, (0, -1), txt="TEST", fill="red", font=CP437_FONT)

    time.sleep(10)

if __name__ == "__main__":
    main()

Actual behaviour

ws281x Library installed from https://github.com/richardghirst/rpi_ws281x, The provided Demo works:

[rm-hull]

Can I ask how the neopixels are arranged? They are serially addressed, so there needs to be a mapping of some sort to turn them into an array of 60x10 pixels.

The unicorn HAT has a snake layout but you can invent your own, see the relevant docs - https://luma-led-matrix.readthedocs.io/en/latest/python-usage.html#pimoroni-unicorn-hat and https://github.com/rm-hull/luma.led_matrix/blob/master/luma/led_matrix/device.py#L335-L346

In order to work out the layout, alter the value for cascaded here: https://github.com/rm-hull/luma.led_matrix/blob/master/examples/neopixel_crawl.py#L11 and then run that program. Observe how the green dot moves over the array, and this should give you enough of an idea how to create your own mapping. If you can't make a video of it, upload to YouTube and post a link here and we'll help.

[rm-hull]

Also, your code:

    with canvas(device, dither=True) as draw:
        text(draw, (0, -1), txt="TEST", fill="red", font=CP437_FONT)

Neopixels are full-color RGB, so no need for the dither=True, ... and try drawing from (0, 0) as well.

What would be useful to debug this is to run the following from luma.examples:

$ python examples/demo.py --display neopixel --width=60 --height=10

And if that works, post a pic of the neopixels with that running.

[macpit]

I have create my own mapping, now all works fine.

Thank you!

[thijstriemstra]

Can you share this mapping here so others can use it?

[thijstriemstra]

P.s. that screen looks huge 😁

[macpit]

The screen is a Dell 43 Zoll 4K Screen :-) The mapping you can find bellow:

10 x 60 LEDS, conected in snake layout.

a = [540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599]
b = [539, 538, 537, 536, 535, 534, 533, 532, 531, 530, 529, 528, 527, 526, 525, 524, 523, 522, 521, 520, 519, 518, 517, 516, 515, 514, 513, 512, 511, 510, 509, 508, 507, 506, 505, 504, 503, 502, 501, 500, 499, 498, 497, 496, 495, 494, 493, 492, 491, 490, 489, 488, 487, 486, 485, 484, 483, 482, 481, 480]
c = [420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479]
d = [419, 418, 417, 416, 415, 414, 413, 412, 411, 410, 409, 408, 407, 406, 405, 404, 403, 402, 401, 400, 399, 398, 397, 396, 395, 394, 393, 392, 391, 390, 389, 388, 387, 386, 385, 384, 383, 382, 381, 380, 379, 378, 377, 376, 375, 374, 373, 372, 371, 370, 369, 368, 367, 366, 365, 364, 363, 362, 361, 360]
e = [300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359]
f = [299, 298, 297, 296, 295, 294, 293, 292, 291, 290, 289, 288, 287, 286, 285, 284, 283, 282, 281, 280, 279, 278, 277, 276, 275, 274, 273, 272, 271, 270, 269, 268, 267, 266, 265, 264, 263, 262, 261, 260, 259, 258, 257, 256, 255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240]
g = [180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239]
h = [179, 178, 177, 176, 175, 174, 173, 172, 171, 170, 169, 168, 167, 166, 165, 164, 163, 162, 161, 160, 159, 158, 157, 156, 155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 144, 143, 142, 141, 140, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129, 128, 127, 126, 125, 124, 123, 122, 121, 120]
i = [60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119]
j = [59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]

p600 = a + b + c + d + e + f + g + h + i + j