Function getOffsetOrigin

docs/app/js/sanddance-app.js:79457–79502

(viewport, coordinateSystem)

];
var getMemoizedViewportUniforms = (0, _memoizeDefault.default)(calculateViewportUniforms);
function getOffsetOrigin(viewport, coordinateSystem) {
    var coordinateOrigin = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : DEFAULT_COORDINATE_ORIGIN;
    var shaderCoordinateOrigin = coordinateOrigin;
    var geospatialOrigin;
    var offsetMode = true;
    if (coordinateSystem === (0, _constants.COORDINATE_SYSTEM).LNGLAT_OFFSETS || coordinateSystem === (0, _constants.COORDINATE_SYSTEM).METER_OFFSETS) geospatialOrigin = coordinateOrigin;
    else geospatialOrigin = viewport.isGeospatial ? [
        Math.fround(viewport.longitude),
        Math.fround(viewport.latitude),
        0
    ] : null;
    switch(viewport.projectionMode){
        case (0, _constants.PROJECTION_MODE).WEB_MERCATOR:
            if (coordinateSystem === (0, _constants.COORDINATE_SYSTEM).LNGLAT || coordinateSystem === (0, _constants.COORDINATE_SYSTEM).CARTESIAN) offsetMode = false;
            break;
        case (0, _constants.PROJECTION_MODE).WEB_MERCATOR_AUTO_OFFSET:
            if (coordinateSystem === (0, _constants.COORDINATE_SYSTEM).LNGLAT) shaderCoordinateOrigin = geospatialOrigin;
            else if (coordinateSystem === (0, _constants.COORDINATE_SYSTEM).CARTESIAN) {
                shaderCoordinateOrigin = [
                    Math.fround(viewport.center[0]),
                    Math.fround(viewport.center[1]),
                    0
                ];
                geospatialOrigin = viewport.unprojectPosition(shaderCoordinateOrigin);
                shaderCoordinateOrigin[0] -= coordinateOrigin[0];
                shaderCoordinateOrigin[1] -= coordinateOrigin[1];
                shaderCoordinateOrigin[2] -= coordinateOrigin[2];
            }
            break;
        case (0, _constants.PROJECTION_MODE).IDENTITY:
            shaderCoordinateOrigin = viewport.position.map(Math.fround);
            break;
        case (0, _constants.PROJECTION_MODE).GLOBE:
            offsetMode = false;
            geospatialOrigin = null;
            break;
        default:
            offsetMode = false;
    }
    shaderCoordinateOrigin[2] = shaderCoordinateOrigin[2] || 0;
    return {
        geospatialOrigin: geospatialOrigin,
        shaderCoordinateOrigin: shaderCoordinateOrigin,
        offsetMode: offsetMode
    };
}
function calculateMatrixAndOffset(viewport, coordinateSystem, coordinateOrigin) {
    var viewMatrixUncentered = viewport.viewMatrixUncentered, projectionMatrix = viewport.projectionMatrix;
    var viewMatrix = viewport.viewMatrix, viewProjectionMatrix = viewport.viewProjectionMatrix;