67 lines
1.8 KiB
TypeScript
67 lines
1.8 KiB
TypeScript
import { Vector3 } from "three";
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import { Extent } from "./build-scene";
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import { unpackEdges, unpackVertices } from "./decoders";
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import proj4 from "proj4";
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export function getMaxSize(extent: Extent) {
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return Math.max(
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extent.xmax - extent.xmin,
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extent.ymax - extent.ymin,
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extent.zmax - extent.zmin
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);
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}
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export function getCenter3D(extent: Extent) {
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return new Vector3(
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(extent.xmin + extent.xmax) / 2,
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(extent.ymin + extent.ymax) / 2,
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(extent.zmax + extent.zmin) / 2
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);
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}
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export async function getMetadata(serviceUrl: string) {
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const response = await fetch(serviceUrl, {
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method: "GET",
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mode: "cors",
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headers: {
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"Content-Type": "application/json",
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},
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});
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if (response.ok) {
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return response.json();
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} else {
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throw new Error("HTTP error status: " + response.status);
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}
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}
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export async function request(url: string) {
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const response = await fetch(url);
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if (response.ok) {
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return response.arrayBuffer();
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} else {
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throw new Error("HTTP error status: " + response.status);
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}
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}
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export async function fetchTriangleIndices(edgeUrl: string, geomId: string) {
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const url = edgeUrl + geomId;
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const buffer = await request(url);
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return unpackEdges(buffer);
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}
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export async function fetchVertices(pointUrl: string, geomId: string) {
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const url = pointUrl + geomId;
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const buffer = await request(url);
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return unpackVertices(buffer);
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}
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// Transformation from EPSG 3034 to EPSG 3857
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const SOURCE = "EPSG:3034";
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const PROJ_STRING =
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"+proj=lcc +lat_0=52 +lon_0=10 +lat_1=35 +lat_2=65 +x_0=4000000 +y_0=2800000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs";
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const DEST = "EPSG:3857";
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proj4.defs(SOURCE, PROJ_STRING);
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export function transform(p: number[]) {
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return proj4(SOURCE, DEST, p);
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}
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