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import Check from "../../Core/Check.js";
import ComponentDatatype from "../../Core/ComponentDatatype.js";
import Frozen from "../../Core/Frozen.js";
import defined from "../../Core/defined.js";
import Ellipsoid from "../../Core/Ellipsoid.js";
import IndexDatatype from "../../Core/IndexDatatype.js";
import Matrix4 from "../../Core/Matrix4.js";
import PrimitiveType from "../../Core/PrimitiveType.js";
import RuntimeError from "../../Core/RuntimeError.js";
import Transforms from "../../Core/Transforms.js";
import AttributeType from "../AttributeType.js";
import JsonMetadataTable from "../JsonMetadataTable.js";
import MetadataSchema from "../MetadataSchema.js";
import ModelComponents from "../ModelComponents.js";
import PropertyTable from "../PropertyTable.js";
import ResourceLoader from "../ResourceLoader.js";
import StructuralMetadata from "../StructuralMetadata.js";
import VertexAttributeSemantic from "../VertexAttributeSemantic.js";
import Buffer from "../../Renderer/Buffer.js";
import BufferUsage from "../../Renderer/BufferUsage.js";
import addAllToArray from "../../Core/addAllToArray.js";
/**
* Loads a GeoJson model as part of the <code>MAXAR_content_geojson</code> extension with the following constraints:
* <ul>
* <li>The top level GeoJSON type must be FeatureCollection or Feature.</li>
* <li>The geometry types must be LineString, MultiLineString, MultiPolygon, Polygon, MultiPoint, or Point.</li>
* <li>Polygon and polyline geometries are converted to geodesic lines.</li>
* <li>Only WGS84 geographic coordinates are supported.</li>
* </ul>
* <p>
* Implements the {@link ResourceLoader} interface.
* </p>
*
* @alias GeoJsonLoader
* @constructor
* @augments ResourceLoader
* @private
*
* @param {object} options Object with the following properties:
* @param {object} options.geoJson The GeoJson object.
*/
function GeoJsonLoader(options) {
options = options ?? Frozen.EMPTY_OBJECT;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("options.geoJson", options.geoJson);
//>>includeEnd('debug');
this._geoJson = options.geoJson;
this._components = undefined;
}
Eif (defined(Object.create)) {
GeoJsonLoader.prototype = Object.create(ResourceLoader.prototype);
GeoJsonLoader.prototype.constructor = GeoJsonLoader;
}
Object.defineProperties(GeoJsonLoader.prototype, {
/**
* The cache key of the resource.
*
* @memberof GeoJsonLoader.prototype
*
* @type {string}
* @readonly
* @private
*/
cacheKey: {
get: function () {
return undefined;
},
},
/**
* The loaded components.
*
* @memberof GeoJsonLoader.prototype
*
* @type {ModelComponents.Components}
* @readonly
* @private
*/
components: {
get: function () {
return this._components;
},
},
});
/**
* Loads the resource.
* @returns {Promise<GeoJsonLoader>} A promise which resolves to the loader when the resource loading is completed.
* @private
*/
GeoJsonLoader.prototype.load = function () {
return Promise.resolve(this);
};
/**
* Processes the resource until it becomes ready.
*
* @param {FrameState} frameState The frame state.
* @private
*/
GeoJsonLoader.prototype.process = function (frameState) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("frameState", frameState);
//>>includeEnd('debug');
Iif (defined(this._components)) {
return true;
}
this._components = parse(this._geoJson, frameState);
this._geoJson = undefined;
return true;
};
function ParsedFeature() {
this.lines = undefined;
this.points = undefined;
this.properties = undefined;
}
function ParseResult() {
this.features = [];
}
function parsePosition(position) {
const x = position[0];
const y = position[1];
const z = position[2] ?? 0.0;
return new Cartesian3(x, y, z);
}
function parseLineString(coordinates) {
const positionsLength = coordinates.length;
const line = new Array(positionsLength);
for (let i = 0; i < positionsLength; i++) {
line[i] = parsePosition(coordinates[i]);
}
const lines = [line];
return lines;
}
function parseMultiLineString(coordinates) {
const linesLength = coordinates.length;
const lines = new Array(linesLength);
for (let i = 0; i < linesLength; i++) {
lines[i] = parseLineString(coordinates[i])[0];
}
return lines;
}
function parsePolygon(coordinates) {
// Treat exterior polygon and interior polygons as lines
const linesLength = coordinates.length;
const lines = new Array(linesLength);
for (let i = 0; i < linesLength; i++) {
lines[i] = parseLineString(coordinates[i])[0];
}
return lines;
}
function parseMultiPolygon(coordinates) {
const polygonsLength = coordinates.length;
const lines = [];
for (let i = 0; i < polygonsLength; i++) {
const polygon = parsePolygon(coordinates[i]);
addAllToArray(lines, polygon);
}
return lines;
}
function parsePoint(coordinates) {
return [parsePosition(coordinates)];
}
function parseMultiPoint(coordinates) {
const pointsLength = coordinates.length;
const points = new Array(pointsLength);
for (let i = 0; i < pointsLength; i++) {
points[i] = parsePosition(coordinates[i]);
}
return points;
}
const geometryTypes = {
LineString: parseLineString,
MultiLineString: parseMultiLineString,
MultiPolygon: parseMultiPolygon,
Polygon: parsePolygon,
MultiPoint: parseMultiPoint,
Point: parsePoint,
};
const primitiveTypes = {
LineString: PrimitiveType.LINES,
MultiLineString: PrimitiveType.LINES,
MultiPolygon: PrimitiveType.LINES,
Polygon: PrimitiveType.LINES,
MultiPoint: PrimitiveType.POINTS,
Point: PrimitiveType.POINTS,
};
function parseFeature(feature, result) {
Iif (!defined(feature.geometry)) {
return;
}
const geometryType = feature.geometry.type;
const geometryFunction = geometryTypes[geometryType];
const primitiveType = primitiveTypes[geometryType];
const coordinates = feature.geometry.coordinates;
Iif (!defined(geometryFunction)) {
return;
}
Iif (!defined(coordinates)) {
return;
}
const parsedFeature = new ParsedFeature();
if (primitiveType === PrimitiveType.LINES) {
parsedFeature.lines = geometryFunction(coordinates);
} else Eif (primitiveType === PrimitiveType.POINTS) {
parsedFeature.points = geometryFunction(coordinates);
}
parsedFeature.properties = feature.properties;
result.features.push(parsedFeature);
}
function parseFeatureCollection(featureCollection, result) {
const features = featureCollection.features;
const featuresLength = features.length;
for (let i = 0; i < featuresLength; i++) {
parseFeature(features[i], result);
}
}
const geoJsonObjectTypes = {
FeatureCollection: parseFeatureCollection,
Feature: parseFeature,
};
const scratchCartesian = new Cartesian3();
function createLinesPrimitive(features, toLocal, frameState) {
// Count the number of vertices and indices
let vertexCount = 0;
let indexCount = 0;
const featureCount = features.length;
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
Eif (defined(feature.lines)) {
const linesLength = feature.lines.length;
for (let j = 0; j < linesLength; j++) {
const line = feature.lines[j];
vertexCount += line.length;
indexCount += (line.length - 1) * 2;
}
}
}
// Allocate typed arrays
const positionsTypedArray = new Float32Array(vertexCount * 3);
const featureIdsTypedArray = new Float32Array(vertexCount);
const indicesTypedArray = IndexDatatype.createTypedArray(
vertexCount,
indexCount,
);
const indexDatatype = IndexDatatype.fromTypedArray(indicesTypedArray);
// Process the data. Convert positions to local ENU. Generate indices.
const localMin = new Cartesian3(
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
);
const localMax = new Cartesian3(
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
);
let vertexCounter = 0;
let segmentCounter = 0;
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
Iif (!defined(feature.lines)) {
continue;
}
const linesLength = feature.lines.length;
for (let j = 0; j < linesLength; j++) {
const line = feature.lines[j];
const positionsLength = line.length;
for (let k = 0; k < positionsLength; k++) {
const cartographic = line[k];
const globalCartesian = Cartesian3.fromDegrees(
cartographic.x,
cartographic.y,
cartographic.z,
Ellipsoid.WGS84,
scratchCartesian,
);
const localCartesian = Matrix4.multiplyByPoint(
toLocal,
globalCartesian,
scratchCartesian,
);
Cartesian3.minimumByComponent(localMin, localCartesian, localMin);
Cartesian3.maximumByComponent(localMax, localCartesian, localMax);
Cartesian3.pack(localCartesian, positionsTypedArray, vertexCounter * 3);
featureIdsTypedArray[vertexCounter] = i;
if (k < positionsLength - 1) {
indicesTypedArray[segmentCounter * 2] = vertexCounter;
indicesTypedArray[segmentCounter * 2 + 1] = vertexCounter + 1;
segmentCounter++;
}
vertexCounter++;
}
}
}
// Create GPU buffers
const positionBuffer = Buffer.createVertexBuffer({
typedArray: positionsTypedArray,
context: frameState.context,
usage: BufferUsage.STATIC_DRAW,
});
positionBuffer.vertexArrayDestroyable = false;
const featureIdBuffer = Buffer.createVertexBuffer({
typedArray: featureIdsTypedArray,
context: frameState.context,
usage: BufferUsage.STATIC_DRAW,
});
featureIdBuffer.vertexArrayDestroyable = false;
const indexBuffer = Buffer.createIndexBuffer({
typedArray: indicesTypedArray,
context: frameState.context,
usage: BufferUsage.STATIC_DRAW,
indexDatatype: indexDatatype,
});
indexBuffer.vertexArrayDestroyable = false;
// Create ModelComponents
const positionAttribute = new ModelComponents.Attribute();
positionAttribute.semantic = VertexAttributeSemantic.POSITION;
positionAttribute.componentDatatype = ComponentDatatype.FLOAT;
positionAttribute.type = AttributeType.VEC3;
positionAttribute.count = vertexCount;
positionAttribute.min = localMin;
positionAttribute.max = localMax;
positionAttribute.buffer = positionBuffer;
const featureIdAttribute = new ModelComponents.Attribute();
featureIdAttribute.semantic = VertexAttributeSemantic.FEATURE_ID;
featureIdAttribute.setIndex = 0;
featureIdAttribute.componentDatatype = ComponentDatatype.FLOAT;
featureIdAttribute.type = AttributeType.SCALAR;
featureIdAttribute.count = vertexCount;
featureIdAttribute.buffer = featureIdBuffer;
const attributes = [positionAttribute, featureIdAttribute];
const material = new ModelComponents.Material();
material.unlit = true;
const indices = new ModelComponents.Indices();
indices.indexDatatype = indexDatatype;
indices.count = indicesTypedArray.length;
indices.buffer = indexBuffer;
const featureId = new ModelComponents.FeatureIdAttribute();
featureId.featureCount = featureCount;
featureId.propertyTableId = 0;
featureId.setIndex = 0;
featureId.positionalLabel = "featureId_0";
const featureIds = [featureId];
const primitive = new ModelComponents.Primitive();
primitive.attributes = attributes;
primitive.indices = indices;
primitive.featureIds = featureIds;
primitive.primitiveType = PrimitiveType.LINES;
primitive.material = material;
return primitive;
}
function createPointsPrimitive(features, toLocal, frameState) {
// Count the number of vertices
let vertexCount = 0;
const featureCount = features.length;
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
Eif (defined(feature.points)) {
vertexCount += feature.points.length;
}
}
// Allocate typed arrays
const positionsTypedArray = new Float32Array(vertexCount * 3);
const featureIdsTypedArray = new Float32Array(vertexCount);
// Process the data. Convert positions to local ENU.
const localMin = new Cartesian3(
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
);
const localMax = new Cartesian3(
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
);
let vertexCounter = 0;
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
Iif (!defined(feature.points)) {
continue;
}
const pointsLength = feature.points.length;
for (let j = 0; j < pointsLength; j++) {
const cartographic = feature.points[j];
const globalCartesian = Cartesian3.fromDegrees(
cartographic.x,
cartographic.y,
cartographic.z,
Ellipsoid.WGS84,
scratchCartesian,
);
const localCartesian = Matrix4.multiplyByPoint(
toLocal,
globalCartesian,
scratchCartesian,
);
Cartesian3.minimumByComponent(localMin, localCartesian, localMin);
Cartesian3.maximumByComponent(localMax, localCartesian, localMax);
Cartesian3.pack(localCartesian, positionsTypedArray, vertexCounter * 3);
featureIdsTypedArray[vertexCounter] = i;
vertexCounter++;
}
}
// Create GPU buffers
const positionBuffer = Buffer.createVertexBuffer({
typedArray: positionsTypedArray,
context: frameState.context,
usage: BufferUsage.STATIC_DRAW,
});
positionBuffer.vertexArrayDestroyable = false;
const featureIdBuffer = Buffer.createVertexBuffer({
typedArray: featureIdsTypedArray,
context: frameState.context,
usage: BufferUsage.STATIC_DRAW,
});
featureIdBuffer.vertexArrayDestroyable = false;
// Create ModelComponents
const positionAttribute = new ModelComponents.Attribute();
positionAttribute.semantic = VertexAttributeSemantic.POSITION;
positionAttribute.componentDatatype = ComponentDatatype.FLOAT;
positionAttribute.type = AttributeType.VEC3;
positionAttribute.count = vertexCount;
positionAttribute.min = localMin;
positionAttribute.max = localMax;
positionAttribute.buffer = positionBuffer;
const featureIdAttribute = new ModelComponents.Attribute();
featureIdAttribute.semantic = VertexAttributeSemantic.FEATURE_ID;
featureIdAttribute.setIndex = 0;
featureIdAttribute.componentDatatype = ComponentDatatype.FLOAT;
featureIdAttribute.type = AttributeType.SCALAR;
featureIdAttribute.count = vertexCount;
featureIdAttribute.buffer = featureIdBuffer;
const attributes = [positionAttribute, featureIdAttribute];
const material = new ModelComponents.Material();
material.unlit = true;
const featureId = new ModelComponents.FeatureIdAttribute();
featureId.featureCount = featureCount;
featureId.propertyTableId = 0;
featureId.setIndex = 0;
featureId.positionalLabel = "featureId_0";
const featureIds = [featureId];
const primitive = new ModelComponents.Primitive();
primitive.attributes = attributes;
primitive.featureIds = featureIds;
primitive.primitiveType = PrimitiveType.POINTS;
primitive.material = material;
return primitive;
}
function parse(geoJson, frameState) {
const result = new ParseResult();
// Parse the GeoJSON
const parseFunction = geoJsonObjectTypes[geoJson.type];
Eif (defined(parseFunction)) {
parseFunction(geoJson, result);
}
const features = result.features;
const featureCount = features.length;
Iif (featureCount === 0) {
throw new RuntimeError("GeoJSON must have at least one feature");
}
// Allocate space for property values
const properties = {};
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
const featureProperties = feature.properties ?? Frozen.EMPTY_OBJECT;
for (const propertyId in featureProperties) {
Eif (featureProperties.hasOwnProperty(propertyId)) {
if (!defined(properties[propertyId])) {
properties[propertyId] = new Array(featureCount);
}
}
}
}
// Fill in the property values. Default to empty string for undefined values.
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
for (const propertyId in properties) {
Eif (properties.hasOwnProperty(propertyId)) {
const value = feature.properties[propertyId] ?? "";
properties[propertyId][i] = value;
}
}
}
const jsonMetadataTable = new JsonMetadataTable({
count: featureCount,
properties: properties,
});
const propertyTable = new PropertyTable({
id: 0,
count: featureCount,
jsonMetadataTable: jsonMetadataTable,
});
const propertyTables = [propertyTable];
const schema = MetadataSchema.fromJson({});
const structuralMetadata = new StructuralMetadata({
schema: schema,
propertyTables: propertyTables,
});
// Find the cartographic bounding box
const cartographicMin = new Cartesian3(
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
);
const cartographicMax = new Cartesian3(
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
);
let hasLines = false;
let hasPoints = false;
for (let i = 0; i < featureCount; i++) {
const feature = features[i];
if (defined(feature.lines)) {
hasLines = true;
const linesLength = feature.lines.length;
for (let j = 0; j < linesLength; j++) {
const line = feature.lines[j];
const positionsLength = line.length;
for (let k = 0; k < positionsLength; k++) {
Cartesian3.minimumByComponent(
cartographicMin,
line[k],
cartographicMin,
);
Cartesian3.maximumByComponent(
cartographicMax,
line[k],
cartographicMax,
);
}
}
}
if (defined(feature.points)) {
hasPoints = true;
const pointsLength = feature.points.length;
for (let j = 0; j < pointsLength; j++) {
const point = feature.points[j];
Cartesian3.minimumByComponent(cartographicMin, point, cartographicMin);
Cartesian3.maximumByComponent(cartographicMax, point, cartographicMax);
}
}
}
// Compute the ENU matrix
const cartographicCenter = Cartesian3.midpoint(
cartographicMin,
cartographicMax,
new Cartesian3(),
);
const ecefCenter = Cartesian3.fromDegrees(
cartographicCenter.x,
cartographicCenter.y,
cartographicCenter.z,
Ellipsoid.WGS84,
new Cartesian3(),
);
const toGlobal = Transforms.eastNorthUpToFixedFrame(
ecefCenter,
Ellipsoid.WGS84,
new Matrix4(),
);
const toLocal = Matrix4.inverseTransformation(toGlobal, new Matrix4());
const primitives = [];
if (hasLines) {
primitives.push(createLinesPrimitive(features, toLocal, frameState));
}
if (hasPoints) {
primitives.push(createPointsPrimitive(features, toLocal, frameState));
}
const node = new ModelComponents.Node();
node.index = 0;
node.primitives = primitives;
const nodes = [node];
const scene = new ModelComponents.Scene();
scene.nodes = nodes;
const components = new ModelComponents.Components();
components.scene = scene;
components.nodes = nodes;
components.transform = toGlobal;
components.structuralMetadata = structuralMetadata;
return components;
}
/**
* Unloads the resource.
* @private
*/
GeoJsonLoader.prototype.unload = function () {
this._components = undefined;
};
export default GeoJsonLoader;
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