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Add ol.geom.flat.linearRingPerimeter

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This commit is contained in:
Tom Payne
2013-11-26 16:26:35 +01:00
parent 8c669ab540
commit d45734634a
1 changed files with 18 additions and 0 deletions
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18
src/ol/geom/flatgeom.js
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@@ -216,6 +216,24 @@ ol.geom.flat.linearRingIsClockwise =
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.
* @param {number} end End.
* @param {number} stride Stride.
* @return {number} Perimeter.
*/
ol.geom.flat.linearRingPerimeter =
function(flatCoordinates, offset, end, stride) {
var perimeter =
ol.geom.flat.lineStringLength(flatCoordinates, offset, end, stride);
var dx = flatCoordinates[end - stride] - flatCoordinates[offset];
var dy = flatCoordinates[end - stride + 1] - flatCoordinates[offset + 1];
perimeter += Math.sqrt(dx * dx + dy * dy);
return perimeter;
};
/**
* @param {Array.<number>} flatCoordinates Flat coordinates.
* @param {number} offset Offset.