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