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feat(landing): limit nztm to its extent #878

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Jul 8, 2020
Merged

feat(landing): limit nztm to its extent #878

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13 changes: 11 additions & 2 deletions packages/landing/src/map.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,14 +11,15 @@ import TileSource from 'ol/source/Tile';
import BaseEvent from 'ol/events/Event';
import { ImageTile } from 'ol';
import { gaEvent, GaEvent } from './config';
import { Extent } from 'ol/extent';

/** Projection to use for the URL bar */
const UrlProjection = Epsg.Wgs84.toEpsgString();

/** Default center point if none provided */
const DefaultCenter: Record<number, MapLocation> = {
[Epsg.Google.code]: { lat: -41.88999621, lon: 174.04924373, zoom: 6 },
[Epsg.Nztm2000.code]: { lat: -41.277848, lon: 174.6763921, zoom: 2 },
[Epsg.Nztm2000.code]: { lat: -41.277848, lon: 174.6763921, zoom: 3 },
};

export interface TileLoadEvent extends BaseEvent {
Expand Down Expand Up @@ -81,10 +82,18 @@ export class Basemaps {

const loc = proj.transform([location.lon, location.lat], UrlProjection, `EPSG:${projection}`);
let resolutions: undefined | number[] = undefined;
let extent: undefined | Extent = undefined;
if (projection == Epsg.Nztm2000) {
resolutions = NztmOl.resolutions;
extent = NztmOl.extent;
}
const view = new View({ projection: projection.toEpsgString(), center: loc, zoom: location.zoom, resolutions });
const view = new View({
projection: projection.toEpsgString(),
center: loc,
zoom: location.zoom,
resolutions,
extent,
});

const source = this.getSource();
source.addEventListener('tileloadstart', this.trackTileLoad);
Expand Down
10 changes: 10 additions & 0 deletions packages/landing/src/nztm2000.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import { Nztm2000Tms } from '@basemaps/geo/build/tms/nztm2000';
import { Extent } from 'ol/extent';
import { register } from 'ol/proj/proj4';
import WMTSTileGrid from 'ol/tilegrid/WMTS.js';
import Proj from 'proj4';
Expand All @@ -14,9 +15,18 @@ const origin = [topLeft[1], topLeft[0]]; // NZTM is defined as y,x not x,y
const resolutions = Nztm2000Tms.zooms.map((c, i) => Nztm2000Tms.pixelScale(i));
const matrixIds = Nztm2000Tms.zooms.map((c) => c.identifier);

const { lowerCorner, upperCorner } = Nztm2000Tms.def.boundingBox;
const extent: Extent = [
lowerCorner[Nztm2000Tms.indexX],
lowerCorner[Nztm2000Tms.indexY],
upperCorner[Nztm2000Tms.indexX],
upperCorner[Nztm2000Tms.indexY],
];

export const NztmOl = {
resolutions,
origin,
matrixIds,
extent,
TileGrid: new WMTSTileGrid({ origin, resolutions, matrixIds }),
};