Add intersection function

Docs/CalculatedTags.md

@@ -20,6 +20,7 @@
     + [sidewalk:left, sidewalk:right, generic_key:left:property, generic_key:right:property](#sidewalkleft,-sidewalk:right,-generic_key:left:property,-generic_key:right:property)
     + [distanceTo](#distanceto)
     + [overlapWith](#overlapwith)
+    + [intersectionsWith](#intersectionswith)
     + [closest](#closest)
     + [closestn](#closestn)
     + [memberships](#memberships)
@@ -200,6 +201,7 @@ Some advanced functions are available on **feat** as well:
 
   - [distanceTo](#distanceTo)
   - [overlapWith](#overlapWith)
+  - [intersectionsWith](#intersectionsWith)
   - [closest](#closest)
   - [closestn](#closestn)
   - [memberships](#memberships)
@@ -223,7 +225,19 @@ The resulting list is sorted in descending order by overlap. The feature with th
 
 For example to get all objects which overlap or embed from a layer, use `_contained_climbing_routes_properties=feat.overlapWith('climbing_route')` 
 
-  0. ...layerIds - one or more layer ids  of the layer from which every feature is checked for overlap)
+  0. ...layerIds - one or more layer ids of the layer from which every feature is checked for overlap)
+ 
+
+### intersectionsWith 
+
+ Gives the intersection points with selected features. Only works with (Multi)Polygons and LineStrings.
+
+Returns a `{feat: GeoJson, intersections: [number,number][]}` where `feat` is the full, original feature. This list is in random order.
+
+If the current feature is a point, this function will return an empty list.
+Points from other layers are ignored - even if the points are parts of the current linestring. 
+
+  0. ...layerIds - one or more layer ids of the layer from which every feature is checked for intersection)
  
 
 ### closest 

Logic/ExtraFunctions.ts

@@ -39,7 +39,7 @@ class OverlapFunc implements ExtraFunction {
         "The resulting list is sorted in descending order by overlap. The feature with the most overlap will thus be the first in the list\n" +
         "\n" +
         "For example to get all objects which overlap or embed from a layer, use `_contained_climbing_routes_properties=feat.overlapWith('climbing_route')`"
-    _args = ["...layerIds - one or more layer ids  of the layer from which every feature is checked for overlap)"]
+    _args = ["...layerIds - one or more layer ids of the layer from which every feature is checked for overlap)"]
 
     _f(params, feat) {
         return (...layerIds: string[]) => {
@@ -67,6 +67,46 @@ class OverlapFunc implements ExtraFunction {
     }
 }
 
+
+class IntersectionFunc implements ExtraFunction {
+
+
+    _name = "intersectionsWith";
+    _doc = "Gives the intersection points with selected features. Only works with (Multi)Polygons and LineStrings.\n\n" +
+        "Returns a `{feat: GeoJson, intersections: [number,number][]}` where `feat` is the full, original feature. This list is in random order.\n\n" +
+        "If the current feature is a point, this function will return an empty list.\n" +
+        "Points from other layers are ignored - even if the points are parts of the current linestring."
+    _args = ["...layerIds - one or more layer ids of the layer from which every feature is checked for intersection)"]
+
+    _f(params: ExtraFuncParams, feat) {
+        return (...layerIds: string[]) => {
+            const result: { feat: any, intersections: [number,number][] }[] = []
+
+            const bbox = BBox.get(feat)
+
+            for (const layerId of layerIds) {
+                const otherLayers = params.getFeaturesWithin(layerId, bbox)
+                if (otherLayers === undefined) {
+                    continue;
+                }
+                if (otherLayers.length === 0) {
+                    continue;
+                }
+                for (const tile of otherLayers) {
+                    for (const otherFeature of tile) {
+                        
+                   const intersections = GeoOperations.LineIntersections(feat, otherFeature)
+                        result.push({feat, intersections})
+                    }
+                }
+            }
+
+            return result;
+        }
+    }
+}
+
+
 class DistanceToFunc implements ExtraFunction {
 
     _name = "distanceTo";
@@ -351,6 +391,7 @@ export class ExtraFunctions {
     private static readonly allFuncs: ExtraFunction[] = [
         new DistanceToFunc(),
         new OverlapFunc(),
+        new IntersectionFunc(),
         new ClosestObjectFunc(),
         new ClosestNObjectFunc(),
         new Memberships(),

Logic/GeoOperations.ts

@@ -356,7 +356,7 @@ export class GeoOperations {
      * Returns 0 if both are linestrings
      * Returns null if the features are not intersecting
      */
-    static calculateInstersection(feature, otherFeature, featureBBox: BBox, otherFeatureBBox?: BBox): number {
+    private static calculateInstersection(feature, otherFeature, featureBBox: BBox, otherFeatureBBox?: BBox): number {
         try {
             if (feature.geometry.type === "LineString") {
 
@@ -442,6 +442,13 @@ export class GeoOperations {
         return undefined;
     }
 
+    /**
+     * Calculates line intersection between two features.
+     */
+    public static LineIntersections(feature, otherFeature): [number,number][]{
+        return turf.lineIntersect(feature, otherFeature).features.map(p =><[number,number]> p.geometry.coordinates)
+    }
+    
     public static AsGpx(feature, generatedWithLayer?: LayerConfig){
         
         const metadata = {}

Models/ThemeConfig/LayoutConfig.ts

@@ -156,6 +156,9 @@ export default class LayoutConfig {
     private static ExtractLayers(json: LayoutConfigJson, official: boolean, context: string): { layers: LayerConfig[], extractAllNodes: boolean } {
         const result: LayerConfig[] = []
         let exportAllNodes = false
+        if(json.layers === undefined){
+            throw "Got undefined layers for "+json.id+" at "+context
+        }
         json.layers.forEach((layer, i) => {
 
             if (typeof layer === "string") {
@@ -193,12 +196,11 @@ export default class LayoutConfig {
             if (typeof names === "string") {
                 names = [names]
             }
+            
+            // This is a very special layer which triggers special behaviour
+            exportAllNodes = names.some(name => name === "type_node");
+            
             names.forEach(name => {
-                if (name === "type_node") {
-                    // This is a very special layer which triggers special behaviour
-                    exportAllNodes = true;
-                }
-
                 const shared = AllKnownLayers.sharedLayersJson.get(name);
                 if (shared === undefined) {
                     throw `Unknown shared/builtin layer ${name} at ${context}.layers[${i}]. Available layers are ${Array.from(AllKnownLayers.sharedLayersJson.keys()).join(", ")}`;

scripts/generateLayerOverview.ts

@@ -88,6 +88,7 @@ class LayerOverviewUtils {
         return errorCount
     }
 
+    
     main(args: string[]) {
 
         AllKnownLayers.runningGenerateScript = true;
@@ -211,6 +212,8 @@ class LayerOverviewUtils {
 
             // We load again from disc, as modifications were made above
             const lt = this.loadThemesAndLayers();
+            
+            
             this.writeFiles(lt);
         } else {
             const errors = layerErrorCount.concat(themeErrorCount).join("\n")