Detect if is retina.

desktop/main.js

@@ -32,6 +32,7 @@ app.on('ready', () =>
   app.win = new BrowserWindow({width: 400, height: 420, minWidth: 400, minHeight: 420,webPreferences: {zoomFactor: 1.0}, backgroundColor:"#000", frame:false, autoHideMenuBar: true, icon: __dirname + '/icon.ico'})
   
   app.win.loadURL(`file://${__dirname}/sources/index.html`);
+  app.win.scaleFactor = require('electron').screen.getPrimaryDisplay().scaleFactor
 
   app.win.on('closed', () => {
     win = null

desktop/sources/scripts/dotgrid.js

@@ -507,7 +507,6 @@ String.prototype.capitalize = function()
   return this.charAt(0).toUpperCase() + this.slice(1).toLowerCase();
 }
 
-
 function is_json(text){ try{ JSON.parse(text);return true; } catch(error){ return false; }}
 function pos_is_equal(a,b){ return a && b && a.x == b.x && a.y == b.y }
 function clamp(v, min, max) { return v < min ? min : v > max ? max : v; }

desktop/sources/scripts/guide.js

@@ -8,7 +8,7 @@ function Guide()
   this.el.style.height = "320px";
   this.show_extras = true;
 
-  var scale = 2;
+  var scale = require('electron').remote.getCurrentWindow().scaleFactor;
 
   this.start = function()
   {