ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

snap to vertices or edges

Browse Source
This commit is contained in:
drnextgis
2016-03-20 03:04:58 +06:00
parent 7990bb3bf6
commit d41bfde25d
3 changed files with 99 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
src/ol/interaction/snapinteraction.js
View File

@@ -61,6 +61,18 @@ ol.interaction.Snap = function(opt_options) {
*/
this.source_ = options.source ? options.source : null;
/**
* @private
* @type {boolean}
*/
this.vertex_ = options.vertex !== undefined ? options.vertex : true;
/**
* @private
* @type {boolean}
*/
this.edge_ = options.edge !== undefined ? options.edge : true;
/**
* @type {ol.Collection.<ol.Feature>}
* @private
@@ -374,28 +386,48 @@ ol.interaction.Snap.prototype.snapTo = function(pixel, pixelCoordinate, map) {
var snapped = false;
var vertex = null;
var vertexPixel = null;
var dist, pixel1, pixel2, squaredDist1, squaredDist2;
if (segments.length > 0) {
this.pixelCoordinate_ = pixelCoordinate;
segments.sort(this.sortByDistance_);
var closestSegment = segments[0].segment;
vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
closestSegment));
vertexPixel = map.getPixelFromCoordinate(vertex);
if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
this.pixelTolerance_) {
snapped = true;
var pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
var pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
var squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
var squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
var dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
if (this.vertex_ && !this.edge_) {
pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
squaredDist1 = ol.coordinate.squaredDistance(pixel, pixel1);
squaredDist2 = ol.coordinate.squaredDistance(pixel, pixel2);
dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
snappedToVertex = dist <= this.pixelTolerance_;
if (snappedToVertex) {
snapped = true;
vertex = squaredDist1 > squaredDist2 ?
closestSegment[1] : closestSegment[0];
vertexPixel = map.getPixelFromCoordinate(vertex);
vertexPixel = [Math.round(vertexPixel[0]), Math.round(vertexPixel[1])];
}
} else if (this.edge_) {
vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
closestSegment));
vertexPixel = map.getPixelFromCoordinate(vertex);
if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
this.pixelTolerance_) {
snapped = true;
if (this.vertex_) {
pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
snappedToVertex = dist <= this.pixelTolerance_;
if (snappedToVertex) {
vertex = squaredDist1 > squaredDist2 ?
closestSegment[1] : closestSegment[0];
vertexPixel = map.getPixelFromCoordinate(vertex);
}
}
}
}
if (snapped) {
vertexPixel = [Math.round(vertexPixel[0]), Math.round(vertexPixel[1])];
}
}
return /** @type {ol.interaction.Snap.ResultType} */ ({