rozek

/**** asString - can also convert Object.create(null) to string ****/

  asString = function asString (Value) {
    switch (Value) {
      case undefined: return '[object Undefined]';
      case null:      return '[object Null]';
      default:
        if (Array.isArray(Value)) { return '[object Array]' };

        return (

rozek

/**** basic JavaScript object whose properties could be used for unit testing ****/

  function newTestObject () {
    return {
      undefined:undefined,
      null:null,
      true:true, false:false,
      negativeInteger:-123, zero:0, positiveInteger:123,
      negativeInfinity:-Infinity, Number:Math.PI, positiveInfinity:Infinity, NaN:NaN,
      emptyString:'', String:'Test',

rozek

// how many characters can be shown per line on Bangle.js using the default font?

  Bangle.setLCDMode();                                // use normal display mode
  g.clear();
  g.setFont('4x6');

  let Digits = '1234567890';
  let StringToDraw = '';
    for (let i = 0; i < 8; i++) { StringToDraw += Digits }
    StringToDraw += '\n';

rozek

// which 8-bit character glyphs are available?
  
  const LineHeight = 10;
  let   yPosition;

/**** clear ****/

  function clear () {
    Bangle.setLCDMode();                              // use normal display mode
    g.clear();

rozek

// fills the display of a Bangle.js with a color stripe

  Bangle.setLCDMode();                                // use normal display mode
  g.clear();

/**** HSVtoRGB ****/
// see https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB

  function HSVtoRGB (h, s, v) {
    let c = v*s;

rozek

// fills the display of a Bangle.js with a color disc

  Bangle.setLCDMode();                                // use normal display mode
  g.clear();

/**** HSVtoRGB (especially for Bangle.js and its RGB565 encoding) ****/
// see https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB

  function HSVtoRGB (h, s, v) {
    let c = v*s;

rozek

  Bangle.setLCDMode();                                // use normal display mode
  g.clear();

  const Width  = g.getWidth();
  const Height = g.getHeight();

/**** color mapping (especially for Bangle.js) ****/

  function rgb565 (r,g,b) {
    return (r << 11) | (g << 5) | b;

rozek

  Bangle.setLCDMode('120x120');
  g.clear();
  g.setFont("6x8");

  const Width  = g.getWidth();
  const Height = g.getHeight();

/**** show screen ****/ 

  g.drawString('Accelerometer', 5,5);

rozek

  const CharsPerLine = 60;
  const LineHeight   = 10;
  let   yPosition;
  
/**** clear ****/

  function clear () {
    Bangle.setLCDMode();                              // use normal display mode
    g.clear();
    g.setFont("4x6");

rozek

  Bangle.setLCDMode('120x120');
  g.clear();

  const Width  = g.getWidth();
  const Height = g.getHeight();

/**** color mapping (especially for Bangle.js) ****/

  function PaletteEntry (r,g,b) {     // 8-bit modes use the "web color palette"
    return r*36 + g*6 + b;