Adding HdpiManager to start and scale from a default resolution that is correct by default for the game.

Fixing VirtualJoystick on resize.

front/tests/Phaser/Services/HdpiManagerTest.ts

@@ -0,0 +1,32 @@
+import "jasmine";
+import {HdpiManager} from "../../../src/Phaser/Services/HdpiManager";
+
+describe("Test HdpiManager", () => {
+    it("should match screen size if size is too small.", () => {
+        const hdpiManager = new HdpiManager(640*480);
+
+        const result = hdpiManager.getOptimalGameSize({ width: 320, height: 200 });
+        expect(result.game.width).toEqual(320);
+        expect(result.game.height).toEqual(200);
+        expect(result.real.width).toEqual(320);
+        expect(result.real.height).toEqual(200);
+    });
+
+    it("should match multiple just above.", () => {
+        const hdpiManager = new HdpiManager(640*480);
+
+        let result = hdpiManager.getOptimalGameSize({ width: 960, height: 600 });
+        expect(result.game.width).toEqual(960);
+        expect(result.game.height).toEqual(600);
+
+        result = hdpiManager.getOptimalGameSize({ width: 640 * 2 + 50, height: 480 * 2 + 50 });
+        expect(result.game.width).toEqual(Math.ceil((640 * 2 + 50) / 2));
+        expect(result.game.height).toEqual((480 * 2 + 50) / 2);
+
+        result = hdpiManager.getOptimalGameSize({ width: 640 * 3 + 50, height: 480 * 3 + 50 });
+        expect(result.game.width).toEqual(Math.ceil((640 * 3 + 50) / 3));
+        expect(result.game.height).toEqual(Math.ceil((480 * 3 + 50) / 3));
+        expect(result.real.width).toEqual(result.game.width * 3);
+        expect(result.real.height).toEqual(result.game.height * 3);
+    });
+});