led-canvas/lib/cursor.js

Lightweight led board implemented with canvas

"use strict";

var _classProps = function (child, staticProps, instanceProps) {
  if (staticProps) Object.defineProperties(child, staticProps);
  if (instanceProps) Object.defineProperties(child.prototype, instanceProps);
};

var Cursor = (function () {
  var Cursor = function Cursor(x, y, height, maxX, maxY) {
    this.x = x;
    this.y = y;

    this.height = height;

    this.max = {
      x: maxX,
      y: maxY
    };
  };

  _classProps(Cursor, null, {
    reset: {
      writable: true,
      value: function () {
        this.x = 1;
        this.y = 0;
      }
    },
    plus: {
      writable: true,
      value: function (x) {
        if (this.x + x <= this.max.x) {
          this.x += x;
        } else {
          this.line();
        }
      }
    },
    minus: {
      writable: true,
      value: function (x) {
        if (this.x + x >= 0) {
          this.x -= x;
        } else {
          this.line(-1);
        }
      }
    },
    line: {
      writable: true,
      value: function (offset) {
        if (offset === undefined) offset = 1;
        var distance = offset * this.height;
        this.x = 1;

        if (this.y + distance <= this.max.y && this.y + distance >= 0) {
          this.y += distance;
        } else {
          this.reset();
        }
      }
    }
  });

  return Cursor;
})();

module.exports = Cursor;