Handling window resize (and rotate).

package.json

@@ -26,6 +26,7 @@
     "jotai": "^1.8.6",
     "lodash": "^4.17.21",
     "react": "^18.2.0",
+    "react-cool-dimensions": "^2.0.7",
     "react-dom": "^18.2.0",
     "react-router": "^5.2.0",
     "react-router-dom": "^5.2.0",

src/App.tsx

@@ -1,15 +1,12 @@
-import { Redirect, Route } from 'react-router-dom';
 import {
   IonApp,
   IonButtons,
   IonContent,
   IonFooter,
   IonHeader,
-  IonRouterOutlet,
   IonToolbar,
   setupIonicReact,
 } from '@ionic/react';
-import { IonReactRouter } from '@ionic/react-router';
 
 /* Core CSS required for Ionic components to work properly */
 import '@ionic/react/css/core.css';

src/components/map/LayerStack.tsx

@@ -79,11 +79,7 @@ export const LayerStack: react.FC<LayerStackProperties> = (
   //  console.log(`tiledLayers: ${JSON.stringify(tiledLayers)}`);
 
   return (
-    <svg
+    <svg width='100%' height='100%' data-testid='layer-stack'>
-      width={window.innerWidth}
-      height={window.innerHeight}
-      data-testid='layer-stack'
-    >
       <g
         transform={`translate(${props.coordinateSystem.shift.x}, ${props.coordinateSystem.shift.y}) scale(${props.coordinateSystem.zoom})`}
       >

src/components/map/LiveMap.tsx

@@ -1,4 +1,6 @@
 import react, { useEffect, useState } from 'react';
+import useDimensions from 'react-cool-dimensions';
+
 import { MapScope, Point } from './types';
 import Map from './Map';
 import Handlers from './Handlers';
@@ -58,6 +60,7 @@ export const LiveMap: react.FC<LiveMapProperties> = (
     setScope(props.scope);
   }, [props.scope]);
   console.log(`LiveMap rendering: ${JSON.stringify(scope)}`);
+  const { observe, width, height } = useDimensions<HTMLDivElement>();
   const transform = (t: Transformation) => {
     const deltaZoom = t.deltaZoom === null ? 1 : t.deltaZoom;
     const deltaZoomLevel = Math.log2(deltaZoom);
@@ -96,12 +99,12 @@ export const LiveMap: react.FC<LiveMapProperties> = (
       x:
         tilesCenter.x -
         actualDeltaShiftTiles.x -
-        (window.innerWidth / 2 / visibleTileSize - actualZoomCenterTiles.x) *
+        (width / 2 / visibleTileSize - actualZoomCenterTiles.x) *
           (deltaZoom - 1),
       y:
         tilesCenter.y -
         actualDeltaShiftTiles.y -
-        (window.innerHeight / 2 / visibleTileSize - actualZoomCenterTiles.y) *
+        (height / 2 / visibleTileSize - actualZoomCenterTiles.y) *
           (deltaZoom - 1),
     };
 
@@ -127,10 +130,10 @@ export const LiveMap: react.FC<LiveMapProperties> = (
   };
 
   return (
-    <>
+    <div style={{ width: '100%', height: '100%' }} ref={observe}>
       <Handlers transformMap={transform} />
       <Map scope={scope} numberOfTiledLayers={props.numberOfTiledLayers} />
-    </>
+    </div>
   );
 };
 

src/components/map/Map.tsx

@@ -1,4 +1,5 @@
 import react from 'react';
+import useDimensions from 'react-cool-dimensions';
 
 import { Point, MapScope } from './types';
 import LayerStack from './LayerStack';
@@ -20,6 +21,8 @@ export interface MapProperties {
  *
  */
 export const Map: react.FC<MapProperties> = (props: MapProperties) => {
+  const { observe, width, height } = useDimensions<HTMLDivElement>();
+
   const tileProvider = tileProviders[props.scope.tileProvider];
 
   const tilesZoom = Math.min(
@@ -33,13 +36,13 @@ export const Map: react.FC<MapProperties> = (props: MapProperties) => {
   const softZoom = props.scope.zoom - tilesZoom;
   const relativeScale = 2 ** softZoom;
   const visibleTileSize = tileProvider.tileSize * relativeScale;
-  const nbTilesLeft = window.innerWidth / 2 / visibleTileSize;
+  const nbTilesLeft = width / 2 / visibleTileSize;
-  const nbTilesTop = window.innerHeight / 2 / visibleTileSize;
+  const nbTilesTop = height / 2 / visibleTileSize;
   const firstTileLeft = Math.floor(tilesCenter.x - nbTilesLeft);
   const firstTileTop = Math.floor(tilesCenter.y - nbTilesTop);
 
   return (
-    <>
+    <div style={{ width: '100%', height: '100%' }} ref={observe}>
       <LayerStack
         numberOfTiledLayers={props.numberOfTiledLayers}
         keyObject={{
@@ -56,7 +59,7 @@ export const Map: react.FC<MapProperties> = (props: MapProperties) => {
           zoom: relativeScale,
         }}
       />
-    </>
+    </div>
   );
 };
 

src/components/map/TiledLayer.tsx

@@ -1,4 +1,4 @@
-import react from 'react';
+import react, { useRef } from 'react';
 import TileSet from './TileSet';
 import { Point, TileKeyObject } from './types';
 import { CoordinateSystem } from './LiveMap';
@@ -32,30 +32,33 @@ export interface TiledLayerProperties {
 export const TiledLayer: react.FC<TiledLayerProperties> = (
   props: TiledLayerProperties
 ) => {
-  const viewPort =
+  const g = useRef<SVGGElement>(null);
-    props.zoom === 256
+  var viewPort: any = undefined;
-      ? {
+  if (
+    props.zoom === 256 &&
+    g.current !== null &&
+    g.current.ownerSVGElement !== null &&
+    g.current.ownerSVGElement.parentElement !== null
+  ) {
+    const nearerHTMLParent = g.current.ownerSVGElement.parentElement;
+    viewPort = {
       topLeft: {
         x:
           props.keyObject.x +
           Math.floor(
-                -props.coordinateSystem.shift.x /
+            -props.coordinateSystem.shift.x / props.coordinateSystem.zoom / 256
-                  props.coordinateSystem.zoom /
-                  256
           ),
         y:
           props.keyObject.y +
           Math.floor(
-                -props.coordinateSystem.shift.y /
+            -props.coordinateSystem.shift.y / props.coordinateSystem.zoom / 256
-                  props.coordinateSystem.zoom /
-                  256
           ),
       },
       bottomRight: {
         x:
           props.keyObject.x +
           Math.ceil(
-                (-props.coordinateSystem.shift.x + window.innerWidth) /
+            (-props.coordinateSystem.shift.x + nearerHTMLParent.offsetWidth) /
               props.coordinateSystem.zoom /
               256
           ) -
@@ -63,17 +66,18 @@ export const TiledLayer: react.FC<TiledLayerProperties> = (
         y:
           props.keyObject.y +
           Math.ceil(
-                (-props.coordinateSystem.shift.y + window.innerHeight) /
+            (-props.coordinateSystem.shift.y + nearerHTMLParent.offsetHeight) /
               props.coordinateSystem.zoom /
               256
           ) -
           1,
       },
+    };
   }
-      : undefined;
   return (
     <g
       transform={`scale(${props.zoom}) translate(${props.shift.x}, ${props.shift.y})`}
+      ref={g}
     >
       <TileSet
         keyObject={{