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Add support for extending linear coordinates when drawing Polygons

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This commit is contained in:
Otto Pellinen
2019-09-13 11:40:15 +03:00
committed by Olivier Guyot
parent 35569a8427
commit 12ce4cc82a
1 changed files with 33 additions and 9 deletions
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42
src/ol/interaction/Draw.js
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@@ -904,21 +904,45 @@ class Draw extends PointerInteraction {
/**
* Extend an existing geometry by adding additional points. This only works
* on features with `LineString` geometries, where the interaction will
* when drawing LineStrings or Polygons. Extending supports only input
* features with `LineString` geometries, where the interaction will
* extend lines by adding points to the end of the coordinates array.
* @param {!Feature<LineString>} feature Feature to be extended.
* @api
*/
extend(feature) {
const geometry = feature.getGeometry();
const lineString = geometry;
this.sketchFeature_ = feature;
this.sketchCoords_ = lineString.getCoordinates();
const last = this.sketchCoords_[this.sketchCoords_.length - 1];
this.finishCoordinate_ = last.slice();
this.sketchCoords_.push(last.slice());
const lineStringGeometry = feature.getGeometry();;
const extendCoordinates = lineStringGeometry.getCoordinates();
const ending = extendCoordinates[extendCoordinates.length-1].slice();
const mode = this.mode_;
let coordinates = [];
if (mode === Mode.LINE_STRING) {
coordinates = this.sketchCoords_;
} else if (mode === Mode.POLYGON) {
coordinates = (this.sketchCoords_)[0];
} else {
return;
}
// (1) Remove last coordinate, (2) extend coordinate list and (3) clone last coordinate
coordinates.pop();
Array.prototype.push.apply(coordinates, extendCoordinates);
coordinates.push(ending)
// Update geometry and sketch line
this.geometryFunction_(this.sketchCoords_, this.sketchFeature_.getGeometry());
if (mode === Mode.POLYGON) {
this.sketchLineCoords_ = this.sketchCoords_[0];
if (this.sketchLine_ !== null) {
this.sketchLine_.getGeometry().setCoordinates(this.sketchLineCoords_);
} else {
this.sketchLine_ = new Feature(
new LineString(this.sketchLineCoords_));
}
}
this.updateSketchFeatures_();
this.dispatchEvent(new DrawEvent(DrawEventType.DRAWSTART, this.sketchFeature_));
}
/**