cesium/Source/Workers/createVectorTilePoints.js

CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.

/* This file is automatically rebuilt by the Cesium build process. */
define(['./when-e6e3e713', './Check-1df6b9a0', './Math-c5f6c994', './Cartesian2-1d7364fa', './AttributeCompression-d68d64ef', './createTaskProcessorWorker'], function (when, Check, _Math, Cartesian2, AttributeCompression, createTaskProcessorWorker) { 'use strict';

    var maxShort = 32767;

        var scratchBVCartographic = new Cartesian2.Cartographic();
        var scratchEncodedPosition = new Cartesian2.Cartesian3();

        var scratchRectangle = new Cartesian2.Rectangle();
        var scratchEllipsoid = new Cartesian2.Ellipsoid();
        var scratchMinMaxHeights = {
            min : undefined,
            max : undefined
        };

        function unpackBuffer(packedBuffer) {
            packedBuffer = new Float64Array(packedBuffer);

            var offset = 0;
            scratchMinMaxHeights.min = packedBuffer[offset++];
            scratchMinMaxHeights.max = packedBuffer[offset++];

            Cartesian2.Rectangle.unpack(packedBuffer, offset, scratchRectangle);
            offset += Cartesian2.Rectangle.packedLength;

            Cartesian2.Ellipsoid.unpack(packedBuffer, offset, scratchEllipsoid);
        }

        function createVectorTilePoints(parameters, transferableObjects) {
            var positions = new Uint16Array(parameters.positions);

            unpackBuffer(parameters.packedBuffer);
            var rectangle = scratchRectangle;
            var ellipsoid = scratchEllipsoid;
            var minimumHeight = scratchMinMaxHeights.min;
            var maximumHeight = scratchMinMaxHeights.max;

            var positionsLength = positions.length / 3;
            var uBuffer = positions.subarray(0, positionsLength);
            var vBuffer = positions.subarray(positionsLength, 2 * positionsLength);
            var heightBuffer = positions.subarray(2 * positionsLength, 3 * positionsLength);
            AttributeCompression.AttributeCompression.zigZagDeltaDecode(uBuffer, vBuffer, heightBuffer);

            var decoded = new Float64Array(positions.length);
            for (var i = 0; i < positionsLength; ++i) {
                var u = uBuffer[i];
                var v = vBuffer[i];
                var h = heightBuffer[i];

                var lon = _Math.CesiumMath.lerp(rectangle.west, rectangle.east, u / maxShort);
                var lat = _Math.CesiumMath.lerp(rectangle.south, rectangle.north, v / maxShort);
                var alt = _Math.CesiumMath.lerp(minimumHeight, maximumHeight, h / maxShort);

                var cartographic = Cartesian2.Cartographic.fromRadians(lon, lat, alt, scratchBVCartographic);
                var decodedPosition = ellipsoid.cartographicToCartesian(cartographic, scratchEncodedPosition);
                Cartesian2.Cartesian3.pack(decodedPosition, decoded, i * 3);
            }

            transferableObjects.push(decoded.buffer);

            return {
                positions : decoded.buffer
            };
        }
    var createVectorTilePoints$1 = createTaskProcessorWorker(createVectorTilePoints);

    return createVectorTilePoints$1;

});