ShuoHuang/public/SuperMap/Cesium/Workers/createVectorTilePoints.js

/**
 * Cesium - https://github.com/AnalyticalGraphicsInc/cesium
 *
 * Copyright 2011-2017 Cesium Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Columbus View (Pat. Pend.)
 *
 * Portions licensed separately.
 * See https://github.com/AnalyticalGraphicsInc/cesium/blob/master/LICENSE.md for full licensing details.
 */
define(['./when-8d13db60', './Check-70bec281', './Math-61ede240', './Cartographic-fe4be337', './Cartesian2-85064f09', './AttributeCompression-84a90a13', './createTaskProcessorWorker'], function (when, Check, _Math, Cartographic, Cartesian2, AttributeCompression, createTaskProcessorWorker) { 'use strict';

    var maxShort = 32767;

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

        transferableObjects.push(decoded.buffer);

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

    return createVectorTilePoints$1;

});