ol/geom/flat/flip.js

OpenLayers mapping library

/**
 * @module ol/geom/flat/flip
 */
/**
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {Array<number>=} opt_dest Destination.
 * @param {number=} opt_destOffset Destination offset.
 * @return {Array<number>} Flat coordinates.
 */
export function flipXY(flatCoordinates, offset, end, stride, opt_dest, opt_destOffset) {
    var dest, destOffset;
    if (opt_dest !== undefined) {
        dest = opt_dest;
        destOffset = opt_destOffset !== undefined ? opt_destOffset : 0;
    }
    else {
        dest = [];
        destOffset = 0;
    }
    var j = offset;
    while (j < end) {
        var x = flatCoordinates[j++];
        dest[destOffset++] = flatCoordinates[j++];
        dest[destOffset++] = x;
        for (var k = 2; k < stride; ++k) {
            dest[destOffset++] = flatCoordinates[j++];
        }
    }
    dest.length = destOffset;
    return dest;
}
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