From b5dd10e92077ce960d629e9f7fbe9466673b7958 Mon Sep 17 00:00:00 2001
From: evlist <vdv@dyomedea.com>
Date: Wed, 19 Oct 2022 13:55:44 +0200
Subject: [PATCH] Adding tests for the <Map> component.

---
 src/components/map/Map.tsx | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/components/map/Map.tsx b/src/components/map/Map.tsx
index 52e3c1e..ab0f240 100644
--- a/src/components/map/Map.tsx
+++ b/src/components/map/Map.tsx
@@ -1,4 +1,4 @@
-import react, { useCallback, useState } from 'react';
+import react, { useCallback } from 'react';
 import { atom, useAtom } from 'jotai';
 
 import Handlers from './Handlers';
@@ -8,12 +8,26 @@ import { Point, TileFactory } from './types';
 
 export interface MapProperties {}
 
-const initialCoordinateSystem = {
+/**
+ * Definition of a coordinate system
+ *
+ * The coordinate system is shifted and zoomed (from the viewport origin)
+ *
+ */
+export interface CoordinateSystem {
+  /** Zoom relative to the origin */
+  zoom: number;
+  /** Origin's shift (in pixels) */
+  shift: Point;
+}
+
+const initialCoordinateSystem: CoordinateSystem = {
   zoom: 1,
   shift: { x: 0, y: 0 },
 };
 
-const coordinateSystemAtom = atom(initialCoordinateSystem);
+/** An atom to store the map coordinates system */
+export const coordinateSystemAtom = atom(initialCoordinateSystem);
 
 /**
  * Description of coordinates system transformation