ol-ext - npm Package Compare versions

Comparing version 3.1.15 to 3.1.16

control/GeolocationBar.js

@@ -39,2 +39,3 @@ /*	Copyright (c) 2016 Jean-Marc VIGLINO,
     minZoom: options.minZoom,
+    tolerance: options.tolerance,
     followTrack: options.followTrack,
@@ -41,0 +42,0 @@ minAccuracy: options.minAccuracy || 10000

control/Swipe.js

@@ -279,5 +279,13 @@ /*
 ol_control_Swipe.prototype.postcompose = function(e) {
-  e.context.restore();
+  // restore context when decluttering is done
+  // https://github.com/openlayers/openlayers/issues/10096
+  if (e.target.getClassName()!=='ol-layer' && e.target.get('declutter')) {
+    setTimeout(function () {
+      e.context.restore();
+    }, 0);
+  } else {
+    e.context.restore();
+  }
 };
 
 export default ol_control_Swipe

interaction/GeolocationDraw.js

@@ -19,3 +19,7 @@ import ol_ext_inherits from '../util/ext'
 import {containsCoordinate as ol_extent_containsCoordinate, containsExtent as ol_extent_containsExtent} from 'ol/extent'
+import {ol_coordinate_dist2d, ol_coordinate_equal} from '../geom/GeomUtils'
+import {transform as ol_proj_transform} from 'ol/proj'
+import {getDistance as ol_spehre_getDistance} from 'ol/sphere'
 
+
 /** Interaction to draw on the current geolocation
@@ -33,3 +37,3 @@ *	It combines a draw with a ol_Geolocation
  *  @param {Object} options.attributes a list of attributes to register as Point properties: {accuracy:true,accuracyGeometry:true,heading:true,speed:true}, default none.
- *  @param {Number} options.tolerance tolerance to add a new point (in projection unit), use ol.geom.LineString.simplify() method, default 5
+ *  @param {Number} options.tolerance tolerance to add a new point (in meter), default 5
  *  @param {Number} options.zoom zoom for tracking, default 16
@@ -146,2 +150,51 @@ *  @param {Number} options.minZoom min zoom for tracking, if zoom is less it will zoom to it, default use zoom option
 
+
+/** Simplify 3D geometry
+ * @param {ol.geom.Geometry} geo
+ * @param {number} tolerance
+ */
+ol_interaction_GeolocationDraw.prototype.simplify3D = function(geo, tolerance) {
+  var geom = geo.getCoordinates();
+  var proj = this.getMap().getView().getProjection();
+  if (this.get("type")==='Polygon') {
+    geom = geom[0];
+  }
+  var simply = [geom[0]];
+  var pi, p = ol_proj_transform(geom[0], proj, 'EPSG:4326')
+  for (var i=1; i<geom.length; i++) {
+    pi = ol_proj_transform(geom[i], proj, 'EPSG:4326')
+    var d = ol_spehre_getDistance(p, pi);
+    if (d > tolerance) {
+      simply.push(geom[i]);
+      p = pi;
+    }
+  }
+  if (simply[simply.length-1] !== geom[geom.length-1]) {
+    simply.push(geom[geom.length-1]);
+  }
+  /*
+  var simply = geo.simplify(tolerance).getCoordinates();
+  if (this.get("type")==='Polygon') {
+    simply = simply[0];
+  }
+  var step=0;
+  simply.forEach(function(p) {
+    for (; step<this.path_.length; step++) {
+      if (ol_coordinate_equal(p, this.path_[step])) {
+        p[2] = this.path_[step][2];
+        p[3] = this.path_[step][3];
+        break;
+      }
+    }
+  }.bind(this));
+  */
+  // Get 3D geom
+  if (this.get("type")==='Polygon') {
+    geo = new ol_geom_Polygon([simply], 'XYZM');
+  } else {
+    geo = new ol_geom_LineString(simply, 'XYZM');
+  }
+  return geo;
+};
+
 /**
@@ -256,3 +309,3 @@ * Remove the interaction from its current map, if any,  and attach it to a new
 ol_interaction_GeolocationDraw.prototype.pause = function(b) {
-  this.pause_ = b!==false;
+  this.pause_ = (b!==false);
 };
@@ -409,3 +462,3 @@
   if (this.pause_) {
-    this.path_ = [pos];   
+    this.lastPosition_ = pos;
   }
@@ -428,3 +481,3 @@ if (!this.pause_ && (!loc || this.condition_.call(this, loc))) {
           geo = new ol_geom_LineString(this.path_, 'XYZM');
-          geo.simplify (this.get("tolerance"));
+          if (this.get("tolerance")) geo = this.simplify3D (geo, this.get("tolerance"));
           f.setGeometry(geo);
@@ -438,3 +491,3 @@ } else {
           geo = new ol_geom_Polygon([this.path_], 'XYZM');
-          geo.simplify (this.get("tolerance"));
+          if (this.get("tolerance")) geo = this.simplify3D (geo, this.get("tolerance"));
           f.setGeometry(geo);
@@ -441,0 +494,0 @@ }

layer/Geoportail.js

@@ -151,9 +151,13 @@ /*	Copyright (c) 2019 Jean-Marc VIGLINO,
 ol_layer_Geoportail.capabilities = {
-  "GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD","title":"Carte IGN","format":"image/jpeg","style":"normal","queryable":false,"tilematrix":"PM","minZoom":0,"maxZoom":18,"bbox":[-179.62723,-84.5047,179.74588,85.47958],"desc":"Cartographie topographique multi-échelles du territoire français issue des bases de données vecteur de l’IGN - emprise nationale, visible du 1/200 au 1/130000000","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":0,"maxZoom":18,"constraint":[{"minZoom":13,"maxZoom":13,"bbox":[-63.37252,13.428586,11.429714,51.44377]},{"minZoom":11,"maxZoom":12,"bbox":[-63.37252,13.428586,11.496459,51.444122]},{"minZoom":9,"maxZoom":9,"bbox":[-64.81273,13.428586,11.496459,51.444016]},{"minZoom":10,"maxZoom":10,"bbox":[-63.37252,13.428586,11.496459,51.444016]},{"minZoom":0,"maxZoom":2,"bbox":[-175.99709,-84.42859,175.99709,84.2865]},{"minZoom":4,"maxZoom":4,"bbox":[-179.62723,-84.0159,-179.21112,85.47958]},{"minZoom":18,"maxZoom":18,"bbox":[-63.189068,-21.428364,55.846638,51.175068]},{"minZoom":15,"maxZoom":17,"bbox":[-63.189117,-21.428364,55.84698,51.175068]},{"minZoom":14,"maxZoom":14,"bbox":[-63.283817,-21.7006,56.039127,51.44377]},{"minZoom":6,"maxZoom":8,"bbox":[-179.49689,-84.02368,179.74588,85.30035]},{"minZoom":3,"maxZoom":3,"bbox":[-176.23093,-84.5047,179.08267,84.89126]},{"minZoom":5,"maxZoom":5,"bbox":[-179.57285,-83.84196,178.4975,85.36646]}]}}},
+  "GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"GEOGRAPHICALGRIDSYSTEMS.MAPS.SCAN-EXPRESS.STANDARD","title":"Carte IGN","format":"image/jpeg","style":"normal","queryable":false,"tilematrix":"PM","minZoom":0,"maxZoom":18,"bbox":[-179.62723,-84.5047,179.74588,85.47958],"desc":"Cartographie topographique multi-échelles du territoire français issue des bases de données vecteur de l’IGN - emprise nationale, visible du 1/200 au 1/130000000","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":0,"maxZoom":18,"constraint":[{"minZoom":5,"maxZoom":5,"bbox":[-179.57285,-83.84196,178.4975,85.36646]},{"minZoom":0,"maxZoom":2,"bbox":[-175.99709,-84.42859,175.99709,84.2865]},{"minZoom":3,"maxZoom":3,"bbox":[-176.23093,-84.5047,179.08267,84.89126]},{"minZoom":4,"maxZoom":4,"bbox":[-179.62723,-84.0159,-179.21112,85.47958]},{"minZoom":6,"maxZoom":8,"bbox":[-179.49689,-84.02368,179.74588,85.30035]},{"minZoom":15,"maxZoom":18,"bbox":[-5.6663494,41.209736,10.819784,51.175068]},{"minZoom":14,"maxZoom":14,"bbox":[-5.713191,40.852314,11.429714,51.44377]},{"minZoom":13,"maxZoom":13,"bbox":[-63.37252,13.428586,11.429714,51.44377]},{"minZoom":11,"maxZoom":12,"bbox":[-63.37252,13.428586,11.496459,51.444122]},{"minZoom":9,"maxZoom":9,"bbox":[-64.81273,13.428586,11.496459,51.444016]},{"minZoom":10,"maxZoom":10,"bbox":[-63.37252,13.428586,11.496459,51.444016]}]}}},
+  "GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2","title":"Plan IGN v2","format":"image/png","style":"normal","queryable":false,"tilematrix":"PM","minZoom":0,"maxZoom":19,"bbox":[-175,-85,175,85],"desc":"Cartographie multi-échelles sur le territoire national, issue des bases de données vecteur de l’IGN, mis à jour régulièrement et réalisée selon un processus entièrement automatisé. Version actuellement en beta test","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":0,"maxZoom":18,"constraint":[{"minZoom":0,"maxZoom":18,"bbox":[-175,-85,175,85]}]}}},
+  "GEOGRAPHICALGRIDSYSTEMS.SLOPES.MOUNTAIN": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"GEOGRAPHICALGRIDSYSTEMS.SLOPES.MOUNTAIN","title":"Carte des pentes","format":"image/png","style":"normal","queryable":false,"tilematrix":"PM","minZoom":0,"maxZoom":17,"bbox":[-63.161392,-21.544624,56.001812,51.099052],"desc":"Carte des zones ayant une valeur de pente supérieure à 30°-35°-40°-45° d'après la BD ALTI au pas de 5m","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":0,"maxZoom":17,"constraint":[{"minZoom":0,"maxZoom":17,"bbox":[-5.1504726,41.32521,9.570543,51.099052]}]}}},
+  "ADMINEXPRESS_COG_2018": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"ADMINEXPRESS_COG_2018","title":"ADMINEXPRESS_COG (2018)","format":"image/png","style":"normal","queryable":true,"tilematrix":"PM","minZoom":6,"maxZoom":16,"bbox":[-63.37252,-21.475586,55.925865,51.31212],"desc":"Limites administratives COG mises à jour en continu. État en Mai 2018.","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":6,"maxZoom":16,"constraint":[{"minZoom":6,"maxZoom":16,"bbox":[-63.37252,-21.475586,55.925865,51.31212]}]}}},
   "ELEVATION.SLOPES": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"ELEVATION.SLOPES","title":"Altitude","format":"image/jpeg","style":"normal","queryable":true,"tilematrix":"PM","minZoom":6,"maxZoom":14,"bbox":[-178.20589,-22.595179,167.43176,50.93085],"desc":"La couche altitude se compose d'un MNT (Modèle Numérique de Terrain) affiché en teintes hypsométriques et issu de la BD ALTI®.","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":6,"maxZoom":14,"constraint":[{"minZoom":6,"maxZoom":14,"bbox":[55.205746,-21.392344,55.846554,-20.86271]}]}}},
   "GEOGRAPHICALGRIDSYSTEMS.MAPS.BDUNI.J1": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"GEOGRAPHICALGRIDSYSTEMS.MAPS.BDUNI.J1","title":"Plan IGN j+1","format":"image/png","style":"normal","queryable":false,"tilematrix":"PM","minZoom":0,"maxZoom":18,"bbox":[-179.5,-75,179.5,75],"desc":"Plan IGN j+1","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":0,"maxZoom":18,"constraint":[{"minZoom":0,"maxZoom":18,"bbox":[-179,-80,179,80]}]}}},
   "CADASTRALPARCELS.PARCELS": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"CADASTRALPARCELS.PARCELS","title":"Parcelles cadastrales","format":"image/png","style":"bdparcellaire","queryable":false,"tilematrix":"PM","minZoom":0,"maxZoom":20,"bbox":[-63.160706,-21.39223,55.84643,51.090965],"desc":"Limites des parcelles cadastrales issues de plans scannés et de plans numériques.","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":0,"maxZoom":20,"constraint":[{"minZoom":0,"maxZoom":20,"bbox":[-63.160706,-21.39223,55.84643,51.090965]}]}}},
-  "ORTHOIMAGERY.ORTHOPHOTOS": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"ORTHOIMAGERY.ORTHOPHOTOS","title":"Photographies aériennes","format":"image/jpeg","style":"normal","queryable":true,"tilematrix":"PM","minZoom":0,"bbox":[-180,-86,180,84],"desc":"Photographies aériennes","originators":{"PLANETOBSERVER":{"href":"http://www.planetobserver.com/","attribution":"PlanetObserver (images satellites)","logo":"https://wxs.ign.fr/static/logos/PLANETOBSERVER/PLANETOBSERVER.gif","minZoom":0,"maxZoom":12,"constraint":[{"minZoom":0,"maxZoom":12,"bbox":[-180,-86,180,84]}]},"MPM":{"href":"http://www.marseille-provence.com/","attribution":"Marseille Provence Métropole","logo":"https://wxs.ign.fr/static/logos/MPM/MPM.gif","minZoom":20,"maxZoom":20,"constraint":[{"minZoom":20,"maxZoom":20,"bbox":[5.076959,43.153347,5.7168245,43.454994]}]},"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et 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+  "ADMINEXPRESS_COG_CARTO_2018": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"ADMINEXPRESS_COG_CARTO_2018","title":"ADMINEXPRESS_COG_CARTO (2018)","format":"image/png","style":"normal","queryable":true,"tilematrix":"PM","minZoom":6,"maxZoom":16,"bbox":[-63.37252,-21.475586,55.925865,51.31212],"desc":"Limites administratives COG généralisées mises à jour en continu. État en Mai 2018.","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":6,"maxZoom":16,"constraint":[{"minZoom":6,"maxZoom":16,"bbox":[-63.37252,-21.475586,55.925865,51.31212]}]}}},
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   "TRANSPORTNETWORKS.ROADS": {"server":"https://wxs.ign.fr/geoportail/wmts","layer":"TRANSPORTNETWORKS.ROADS","title":"Routes","format":"image/png","style":"normal","queryable":false,"tilematrix":"PM","minZoom":6,"maxZoom":18,"bbox":[-63.969162,-21.49687,55.964417,71.584076],"desc":"Affichage du réseau routier français et européen.","originators":{"IGN":{"href":"http://www.ign.fr","attribution":"Institut national de l'information géographique et forestière","logo":"https://wxs.ign.fr/static/logos/IGN/IGN.gif","minZoom":6,"maxZoom":18,"constraint":[{"minZoom":15,"maxZoom":18,"bbox":[-63.37252,-21.475586,55.925865,51.31212]},{"minZoom":6,"maxZoom":14,"bbox":[-63.969162,-21.49687,55.964417,71.584076]}]}}},
@@ -160,0 +164,0 @@ };

package.json

 {
   "name": "ol-ext",
-  "version": "3.1.15",
+  "version": "3.1.16",
   "description": "A set of cool extensions for OpenLayers (ol) in node modules structure",
@@ -5,0 +5,0 @@ "main": "dist/ol-ext.js",

style/FlowLine.js

@@ -11,2 +11,3 @@ /*	Copyright (c) 2019 Jean-Marc VIGLINO,
 import {ol_coordinate_dist2d} from '../geom/GeomUtils'
+import '../geom/LineStringSplitAt'
 
@@ -24,2 +25,3 @@ /** Flow line style
  *  @param {number} options.width2 Final stroke width
+ *  @param {number} options.arrow Arrow at start (-1), at end (1), at both (2), none (0), default geta
  *  @param {ol.colorLike|function} options.color Stroke color or a function that gets a feature and the position (beetween [0,1]) and returns current color
@@ -55,2 +57,8 @@ *  @param {ol.colorLike} options.color2 Final sroke color
   this.setLineCap(options.lineCap);
+  // 
+  this.setArrow(options.arrow);
+  //
+  this._offset = [0,0];
+  this.setOffset(options.offset0, 0);
+  this.setOffset(options.offset1, 1);
 };
@@ -73,2 +81,28 @@ ol_ext_inherits(ol_style_FlowLine, ol_style_Style);
 
+/** Get offset at start or end
+ * @param {number} where 0=start, 1=end
+ * @return {number} width
+ */
+ol_style_FlowLine.prototype.getOffset = function(where) {
+  return this._offset[where];
+};
+
+/** Add an offset at start or end
+ * @param {number} width
+ * @param {number} where 0=start, 1=end
+ */
+ol_style_FlowLine.prototype.setOffset = function(width, where) {
+  width = Math.max(0, parseFloat(width));
+  switch(where) {
+    case 0: {
+      this._offset[0] = width;
+      break;
+    }
+    case 1: {
+      this._offset[1] = width;
+      break;
+    }
+  }
+};
+
 /** Set the LineCap
@@ -131,2 +165,52 @@ * @param {steing} cap LineCap (round or butt), default butt
 
+/** Get arrow
+ */
+ol_style_FlowLine.prototype.getArrow = function() {
+  return this._arrow;
+};
+
+/** Set arrow
+ * @param {number} n -1 | 0 | 1 | 2, default: 0
+ */
+ol_style_FlowLine.prototype.setArrow = function(n) {
+  this._arrow = parseInt(n);
+  if (this._arrow < -1 || this._arrow > 2) this._arrow = 0;
+}
+
+/** getArrowSize
+ * @return {ol.size}
+ */
+ol_style_FlowLine.prototype.getArrowSize = function() {
+  return this._arrowSize || [16,16];
+};
+
+/** setArrowSize
+ * @param {number|ol.size} size
+ */
+ol_style_FlowLine.prototype.setArrowSize = function(size) {
+  if (Array.isArray(size)) this._arrowSize = size;
+  else if (typeof(size) === 'number') this._arrowSize = [size,size];
+};
+
+/** drawArrow
+ * @param {CanvasRenderingContext2D} ctx 
+ * @param {ol.coordinate} p0 
+ * @param ol.coordinate} p1 
+ * @param {number} width 
+ * @private
+ */
+ol_style_FlowLine.prototype.drawArrow = function (ctx, p0, p1, width) {
+  var asize = this.getArrowSize()[0];
+  var l = ol_coordinate_dist2d(p0, p1);
+  var dx = (p0[0]-p1[0])/l;
+  var dy = (p0[1]-p1[1])/l;
+  var width = Math.max(this.getArrowSize()[1]/2, width/2);
+  ctx.beginPath();
+  ctx.moveTo(p0[0],p0[1]);
+  ctx.lineTo(p0[0]-asize*dx+width*dy, p0[1]-asize*dy-width*dx);
+  ctx.lineTo(p0[0]-asize*dx-width*dy, p0[1]-asize*dy+width*dx);
+  ctx.lineTo(p0[0],p0[1]);
+  ctx.fill();
+};
+
 /** Renderer function
@@ -138,7 +222,7 @@ * @param {Array<ol.coordinate>} geom The pixel coordinates of the geometry in GeoJSON notation
   if (e.geometry.getType()==='LineString') {
-    var i, p, ctx = e.context;
+    var i, g, p, ctx = e.context;
     // Get geometry used at drawing
     if (!this._visible) {
       var a = e.pixelRatio / e.resolution;
-      var g = e.geometry.getCoordinates();
+      g = e.geometry.getCoordinates();
       var dx = geom[0][0] - g[0][0] * a;
@@ -151,21 +235,45 @@ var dy = geom[0][1] + g[0][1] * a;
     }
-    // Split into
-    var geoms = this._splitInto(geom, 255, 2);
-    var k = 0;
-    var nb = geoms.length;
-    // Draw
+
+    var asize = this.getArrowSize()[0];
+
     ctx.save();
+      // Offsets
+      if (this.getOffset(0)) this._splitAsize(geom, this.getOffset(0))
+      if (this.getOffset(1)) this._splitAsize(geom, this.getOffset(1), true)
+      // Arrow 1
+      if (geom.length>1 && (this.getArrow()===-1 || this.getArrow()===2)) {
+        var p = this._splitAsize(geom, asize);
+        ctx.fillStyle = this.getColor(e.feature, 0);
+        this.drawArrow(ctx, p[0], p[1], this.getWidth(e.feature, 0) * e.pixelRatio);
+      }
+      // Arrow 2 
+      if (geom.length>1 && this.getArrow()>0) {
+        var p = this._splitAsize(geom, asize, true)
+        ctx.fillStyle = this.getColor(e.feature, 1);
+        this.drawArrow(ctx, p[0], p[1], this.getWidth(e.feature, 1) * e.pixelRatio);
+      }
+
+      // Split into
+      var geoms = this._splitInto(geom, 255, 2);
+      var k = 0;
+      var nb = geoms.length;
+      
+      // Draw
       ctx.lineJoin = 'round';
       ctx.lineCap = this._lineCap || 'butt';
-      geoms.forEach(function(g) {
-        var step = k++/nb;
-        ctx.lineWidth = this.getWidth(e.feature, step) * e.pixelRatio;
-        ctx.strokeStyle = this.getColor(e.feature, step);
-        ctx.beginPath();
-        ctx.moveTo(g[0][0],g[0][1]);
-        for (i=1; p=g[i]; i++) {
-          ctx.lineTo(p[0],p[1]);
+
+      if (geoms.length > 1) {
+        for (k=0; k<geoms.length; k++) {
+          var step = k/nb;
+          g = geoms[k];
+          ctx.lineWidth = this.getWidth(e.feature, step) * e.pixelRatio;
+          ctx.strokeStyle = this.getColor(e.feature, step);
+          ctx.beginPath();
+          ctx.moveTo(g[0][0],g[0][1]);
+          for (i=1; p=g[i]; i++) {
+            ctx.lineTo(p[0],p[1]);
+          }
           ctx.stroke();
         }
-      }.bind(this));
+      }
     ctx.restore();
@@ -175,2 +283,34 @@ }
 
+/** Split extremity
+ * @param {ol.geom.LineString} geom
+ * @param {number} asize
+ * @param {boolean} end start=false or end=true, default false (start)
+ */
+ol_style_FlowLine.prototype._splitAsize = function(geom, asize, end) {
+  var p, p1, p0;
+  var dl, d = 0;
+  if (end) p0 = geom.pop();
+  else p0 = geom.shift();
+  p = p0;
+  while(geom.length) {
+    if (end) p1 = geom.pop();
+    else p1 = geom.shift();
+    dl = ol_coordinate_dist2d(p,p1);
+    if (d+dl > asize) {
+      p = [p[0]+(p1[0]-p[0])*asize/dl, p[1]+(p1[1]-p[1])*asize/dl];
+      if (end) {
+        geom.push(p1);
+        geom.push(p);
+      } else {
+        geom.unshift(p1);
+        geom.unshift(p);
+      }
+      break;
+    }
+    d += dl;
+    p = p1;
+  }
+  return [p0,p1];
+};
+
 /** Split line geometry into equal length geometries
@@ -177,0 +317,0 @@ * @param {Array<ol.coordinate>} geom

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