Tobias

Most recent activity

• Receiving simple data from phone

  in Bangle.js • 2 years

  

  Thanks a lot, I had a look at the tutorials but did not find something very usefull. But thanks for all the suggestions. I will give it a try!

• Receiving simple data from phone

  @Tobias started

  • 5 comments
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• Drawing Images from Array

  in Bangle.js • 2 years

  

  Thanks, I guess I gonna look into this a bit further.

• Drawing Images from Array

  @Tobias started

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  @Tobias replied
• Receiving simple data from phone

  in Bangle.js • 2 years

  

  Hello everyone,

  for my future Bangle.js project I need to send data from my Android device to the watch. Since I'm experienced in the Android development part, I only struggle with the watch side.
  I would assume there should be a simple way of receiving data via Bluetooth (LE) that just reacts to incoming "streams" from the phone.

  Could anyone point me in the right direction?

  I found that one
  http://forum.espruino.com/conversations/­364065/#comment16008718
  but it doesn't seem to be exactly what I need. Especially since it's pretty much code where as I would simply be happy with a minimal example like sending a String to the watch and printing it.

  Thanks for any assistance.

• Drawing Images from Array

  in Bangle.js • 2 years, 1 month

  

  Okay, some updates.

  I made it. The issue was I had to define a palette myself. I falsely assumed there was one already existing.

  However there seems to be still an issue.

  I defined this:

  var pal = new Uint16Array([
  0x0000, //0000000000000000 BLACK
  0xF800, //1111100000000000 5 bit RED
  0x07E0, //0000011111100000 6 bits GREEN
  0x001F, //0000000000011111 5 bit BLUE
  0x0000, //0000000000000000 BLACK
  0xF800, //1111100000000000 5 bit RED
  0x07E0, //0000011111100000 6 bits GREEN
  0x001F, //0000000000011111 5 bit BLUE
  ]);
  
  var colors = new Uint8Array([
    0b00110011, 0b00110010,
    0b00110011, 0b00110010,
    0b00110011, 0b00110010,
    0b00110011, 0b00110010,
  ]);
  
  var img = {
    width : 4, height : 4, bpp : 4,
    palette:pal,
    buffer : colors.buffer
  };
  
  g.drawImage(img, 10, 10)
  

  But the error I get goes as follows:

  Uncaught Error: Palette specified, but must be a flat Uint16Array of 2,4,8,16,256 elements
  at line 1 col 24

  But I have 8 elements there. If I chose 2, 4 or 16 everything works fine. So is this a bug? Am I missing something? Why would it tell me 8 colors are fine when they are obviously not?

• Drawing Images from Array

  in Bangle.js • 2 years, 1 month

  

  Sorry for posting this twice. I'm not sure which board is the right one to ask something for my Bangle.js project. Please close the wrong one if needed (http://forum.espruino.com/conversations/­373677/#comment16426952)

  ---

  Hello everyone,
  in my project for my Bangle.js I need to draw a picture from an Array.
  Since it has to be performant - and the display isn't capable of many more colors - I was thinking of using the 4bit images.
  The API
  https://www.espruino.com/Reference#l_Gra­phics_drawImage
  states
  "On Bangle.js, 4 bit images use the Apple Mac 16 color palette"
  However, I don't seem to understand how this palette is organized.

  From what I understand when painting the image, defining the bpp to 4 enables this dirctly. And the values that are drawn are not color values (e.g. RGB) but values of a fixed color set. E.g. 0 = black, 1 = yellow or such kind)

  So I made a minimal example code like this hoping to see some colors:

  var colorPalette3 = new Uint8Array([
       0b00010000
  ]);
  
  var img = {
    width : 1, height : 1, bpp : 4,
    buffer : colorPalette3.buffer
  };
  
  g.drawImage(img, 10, 10)
  

  However this is almost all the time showing a black pixel. Some values lead to other colors but I can't understand the pattern. I also tried it with integer values hoping to understand the palette but without success.

  Could anyone help me with that? Or maybe a like would be nice.
  I even tried the color scheme I saw on Wikipedia where each bit suggests the color canal to be 1 or 0. But even then a 001 should not be black, right?
  https://en.wikipedia.org/wiki/List_of_mo­nochrome_and_RGB_color_formats#3-bit_RGB­

  Thanks for the help!