Decaffeinate utils

src/utils.coffee

@@ -1,74 +0,0 @@
-###
-  termap - Terminal Map Viewer
-  by Michael Strassburger <codepoet@cpan.org>
-
-  methods used all around
-###
-config = require './config'
-
-constants =
-  RADIUS: 6378137
-
-utils =
-  clamp: (num, min, max) ->
-    if num <= min then min else if num >= max then max else num
-
-  baseZoom: (zoom) ->
-    Math.min config.tileRange, Math.max 0, Math.floor zoom
-
-  tilesizeAtZoom: (zoom) ->
-    config.projectSize * Math.pow(2, zoom-utils.baseZoom(zoom))
-
-  deg2rad: (angle) ->
-    # (angle / 180) * Math.PI
-    angle * 0.017453292519943295
-
-  ll2tile: (lon, lat, zoom) ->
-    x: (lon+180)/360*Math.pow(2, zoom)
-    y:  (1-Math.log(Math.tan(lat*Math.PI/180)+1/Math.cos(lat*Math.PI/180))/Math.PI)/2*Math.pow(2, zoom)
-    z:  zoom
-
-  tile2ll: (x, y, zoom) ->
-    n = Math.PI - 2*Math.PI*y/Math.pow(2, zoom)
-
-    lon: x/Math.pow(2, zoom)*360-180
-    lat: 180/Math.PI*Math.atan(0.5*(Math.exp(n)-Math.exp(-n)))
-
-  metersPerPixel: (zoom, lat = 0) ->
-    (Math.cos(lat * Math.PI/180) * 2 * Math.PI * constants.RADIUS) / (256 * Math.pow(2, zoom))
-
-  hex2rgb: (color) ->
-    return [255, 0, 0] unless color?.match
-
-    unless color.match /^#[a-fA-F0-9]{3,6}$/
-      throw new Error "#{color} isn\'t a supported hex color"
-
-    color = color.substr 1
-    decimal = parseInt color, 16
-
-    if color.length is 3
-      rgb = [decimal>>8, (decimal>>4)&15, decimal&15]
-      rgb.map (c) => c + (c<<4)
-    else
-      [(decimal>>16)&255, (decimal>>8)&255, decimal&255]
-
-  digits: (number, digits) ->
-    Math.floor(number*Math.pow(10, digits))/Math.pow(10, digits)
-
-  normalize: (ll) ->
-    ll.lon += 360 if ll.lon < -180
-    ll.lon -= 360 if ll.lon > 180
-
-    ll.lat = 85.0511 if ll.lat > 85.0511
-    ll.lat = -85.0511 if ll.lat < -85.0511
-
-    ll
-
-  population: (val) ->
-    bits = 0
-    while val>0
-      bits += val & 1
-      val >>= 1
-    bits
-
-module.exports = utils

src/utils.js

@@ -0,0 +1,103 @@
+/*
+  termap - Terminal Map Viewer
+  by Michael Strassburger <codepoet@cpan.org>
+
+  methods used all around
+*/
+'use strict';
+const config = require('./config');
+
+const constants = {
+  RADIUS: 6378137,
+};
+
+const utils = {
+  clamp: (num, min, max) => {
+    if (num <= min) {
+      return min
+    } else if (num >= max) {
+      return max;
+    } else {
+      return num;
+    }
+  },
+
+  baseZoom: (zoom) => {
+    return Math.min(config.tileRange, Math.max(0, Math.floor(zoom)));
+  },
+
+  tilesizeAtZoom: (zoom) => {
+    return config.projectSize * Math.pow(2, zoom-utils.baseZoom(zoom));
+  },
+
+  deg2rad: (angle) => {
+    // (angle / 180) * Math.PI
+    return angle * 0.017453292519943295;
+  },
+
+  ll2tile: (lon, lat, zoom) => {
+    return {
+      x: (lon+180)/360*Math.pow(2, zoom),
+      y: (1-Math.log(Math.tan(lat*Math.PI/180)+1/Math.cos(lat*Math.PI/180))/Math.PI)/2*Math.pow(2, zoom),
+      z: zoom,
+    };
+  },
+
+  tile2ll: (x, y, zoom) => {
+    const n = Math.PI - 2*Math.PI*y/Math.pow(2, zoom);
+
+    return {
+      lon: x/Math.pow(2, zoom)*360-180,
+      lat: 180/Math.PI*Math.atan(0.5*(Math.exp(n)-Math.exp(-n))),
+    };
+  },
+
+  metersPerPixel: (zoom, lat = 0) => {
+    return (Math.cos(lat * Math.PI/180) * 2 * Math.PI * constants.RADIUS) / (256 * Math.pow(2, zoom));
+  },
+
+  hex2rgb: (color) => {
+    if (typeof color !== 'string') return [255, 0, 0];
+
+    if (/^#[a-fA-F0-9]{3,6}$/.test()) {
+      throw new Error('#{color} isn\'t a supported hex color');
+    }
+
+    color = color.substr(1);
+    const decimal = parseInt(color, 16);
+
+    if (color.length === 3) {
+      const rgb = [decimal>>8, (decimal>>4)&15, decimal&15];
+      return rgb.map((c) => {
+          return c + (c<<4);
+      });
+    } else {
+      return [(decimal>>16)&255, (decimal>>8)&255, decimal&255];
+    }
+  },
+
+  digits: (number, digits) => {
+    return Math.floor(number*Math.pow(10, digits))/Math.pow(10, digits);
+  },
+
+  normalize: (ll) => {
+    if (ll.lon < -180) ll.lon += 360;
+    if (ll.lon > 180) ll.lon -= 360;
+
+    if (ll.lat > 85.0511) ll.lat = 85.0511;
+    if (ll.lat < -85.0511) ll.lat = -85.0511;
+
+    return ll;
+  },
+
+  population: (val) => {
+    let bits = 0
+    while (val > 0) {
+      bits += val & 1;
+      val >>= 1;
+    }
+    return bits;
+  },
+};
+
+module.exports = utils;