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Add new ol.geom.LineString#getCoordinateAt function

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This commit is contained in:
Frederic Junod
2015-12-10 16:13:21 +01:00
parent 4ba443e829
commit e336947e8d
2 changed files with 51 additions and 3 deletions
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21
src/ol/geom/linestring.js
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@@ -166,6 +166,23 @@ ol.geom.LineString.prototype.getCoordinates = function() {
};
/**
* Return the coordinate at the provided fraction along the linestring.
* The `fraction` is a number between 0 and 1, where 0 is the start of the
* linestring and 1 is the end.
* @param {number} fraction Fraction.
* @param {ol.Coordinate=} opt_dest Optional coordinate whose values will
* be modified. If not provided, a new coordinate will be returned.
* @return {ol.Coordinate} Coordinate of the interpolated point.
* @api
*/
ol.geom.LineString.prototype.getCoordinateAt = function(fraction, opt_dest) {
return ol.geom.flat.interpolate.lineString(
this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
fraction, opt_dest);
};
/**
* Return the length of the linestring on projected plane.
* @return {number} Length (on projected plane).
@@ -182,9 +199,7 @@ ol.geom.LineString.prototype.getLength = function() {
*/
ol.geom.LineString.prototype.getFlatMidpoint = function() {
if (this.flatMidpointRevision_ != this.getRevision()) {
this.flatMidpoint_ = ol.geom.flat.interpolate.lineString(
this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
0.5, this.flatMidpoint_);
this.flatMidpoint_ = this.getCoordinateAt(0.5, this.flatMidpoint_);
this.flatMidpointRevision_ = this.getRevision();
}
return this.flatMidpoint_;