led-canvas-text/lib/index.js

Generate text matrices compatible with led-canvas

"use strict";

var LedCanvasMatrix = require("led-canvas-matrix");

var LedCanvasText = function LedCanvasText(str, font, ledFactory) {
  var matrices = [];

  str.split("").forEach(function (character) {
    var fontCharacter = font.chars[character];
    var lineHeight = font.meta.lineHeight;

    if (!fontCharacter) {
      return matrices.push(new LedCanvasMatrix(0, 0, 4, lineHeight, ledFactory));
    }

    var charWidth = fontCharacter.width || font.meta.charWidth;
    var pixelOffset = fontCharacter.offset || 0;

    var matrix = new LedCanvasMatrix(0, 0, charWidth, lineHeight, ledFactory);

    fontCharacter.data.forEach(function (pixel) {
      matrix.index(pixel + pixelOffset).set(true);
    });

    matrices.push(matrix);
    matrices.push(new LedCanvasMatrix(0, 0, font.meta.charSpacing, lineHeight, ledFactory));
  });

  return matrices.reduce(function (base, next) {
    return base.add(next);
  });
};

module.exports = LedCanvasText;