Increased coverage and added isSelfIntersecting

src/extras/BuildingShapeUtils.js

@@ -37,7 +37,7 @@ class BuildingShapeUtils extends ShapeUtils {
   }
 
   /**
-   * Check if a way is a cloased shape.
+   * Check if a way is a closed shape.
    *
    * @param {DOM.Element} way - OSM XML way element.
    *
@@ -49,6 +49,29 @@ class BuildingShapeUtils extends ShapeUtils {
     return elements[0].getAttribute('ref') === elements[elements.length - 1].getAttribute('ref');
   }
 
+  /**
+   * Check if a way is self-intersecting.
+   *
+   * @param {DOM.Element} way - OSM XML way element.
+   *
+   * @return {boolean}
+   */
+  static isSelfIntersecting(way) {
+    const nodes = Array.from(way.getElementsByTagName('nd'));
+    if (BuildingShapeUtils.isClosed(way)){
+      nodes.pop();
+    }
+    const refs = new Set();
+    for (const node of nodes) {
+      const ref = node.getAttribute('ref');
+      if (refs.has(ref)){
+        return true;
+      }
+      refs.add(ref);
+    }
+    return false;
+  }
+
   /**
    * Walk through an array and seperate any closed ways.
    * Attempt to find matching open ways to enclose them.
@@ -92,8 +115,8 @@ class BuildingShapeUtils extends ShapeUtils {
             i++;
             changed = true;
           } else if (way1[0].getAttribute('ref') === way2[0].getAttribute('ref')) {
-            const tempway = BuildingShapeUtils.reverseWay(ways[i]);
-            const result = BuildingShapeUtils.joinWays(tempway, ways[i + 1]);
+            const tempway = BuildingShapeUtils.reverseWay(ways[i+1]);
+            const result = BuildingShapeUtils.joinWays(tempway, ways[i]);
             openWays.push(result);
             i++;
             changed = true;

test/combine_ways.test.js

@@ -0,0 +1,101 @@
+/**
+ * @jest-environment jsdom
+ */
+
+import {toBeDeepCloseTo} from 'jest-matcher-deep-close-to';
+expect.extend({toBeDeepCloseTo});
+
+import { TextEncoder } from 'node:util';
+global.TextEncoder = TextEncoder;
+
+import { Shape } from 'three';
+
+import { BuildingShapeUtils } from '../src/extras/BuildingShapeUtils.js';
+// import { JSDOM } from 'jsdom';
+
+test('Test no combining necessary. one open way', () => {
+  var way1 = '<way id="1"><nd ref="1"/><nd ref="2"/><nd ref="3"/><nd ref="4"/></way>';
+  let parser = new window.DOMParser();
+  let xml1 = parser.parseFromString(way1, 'text/xml').getElementsByTagName('way')[0];
+  let result = BuildingShapeUtils.combineWays([xml1]);
+  expect(result.length).toBe(0);
+});
+
+test('Test combining 2 ways 1->2', () => {
+  var way1 = '<way id="1"><nd ref="1"/><nd ref="2"/></way>';
+  var way2 = '<way id="2"><nd ref="2"/><nd ref="3"/></way>';
+  var way3 = '<way id="3"><nd ref="3"/><nd ref="1"/></way>';
+  let parser = new window.DOMParser();
+  let xml1 = parser.parseFromString(way1, 'text/xml').getElementsByTagName('way')[0];
+  let xml2 = parser.parseFromString(way2, 'text/xml').getElementsByTagName('way')[0];
+  let xml3 = parser.parseFromString(way3, 'text/xml').getElementsByTagName('way')[0];
+  let result = BuildingShapeUtils.combineWays([xml1, xml2, xml3]);
+  // Expect one closed way with 3 unique nodes.
+  expect(result.length).toBe(1);
+  expect(BuildingShapeUtils.isClosed(result[0])).toBe(true);
+  expect(result[0].getElementsByTagName('nd').length).toBe(4);
+  expect(BuildingShapeUtils.isSelfIntersecting(result[0])).toBe(false);
+});
+
+test('Test combining 3 ways 2->1->3', () => {
+  var way1 = '<way id="1"><nd ref="1"/><nd ref="2"/></way>';
+  var way2 = '<way id="2"><nd ref="3"/><nd ref="1"/></way>';
+  var way3 = '<way id="3"><nd ref="2"/><nd ref="3"/></way>';
+  let parser = new window.DOMParser();
+  let xml1 = parser.parseFromString(way1, 'text/xml').getElementsByTagName('way')[0];
+  let xml2 = parser.parseFromString(way2, 'text/xml').getElementsByTagName('way')[0];
+  let xml3 = parser.parseFromString(way3, 'text/xml').getElementsByTagName('way')[0];
+  let result = BuildingShapeUtils.combineWays([xml1, xml2, xml3]);
+  expect(result.length).toBe(1);
+  expect(BuildingShapeUtils.isClosed(result[0])).toBe(true);
+  expect(BuildingShapeUtils.isSelfIntersecting(result[0])).toBe(false);
+  expect(result[0].getElementsByTagName('nd').length).toBe(4);
+});
+
+test('Test combining 2 unaligned ways', () => {
+  var way1 = '<way id="1"><nd ref="1"/><nd ref="2"/></way>';
+  var way2 = '<way id="2"><nd ref="3"/><nd ref="2"/></way>';
+  var way3 = '<way id="3"><nd ref="3"/><nd ref="1"/></way>';
+  let parser = new window.DOMParser();
+  let xml1 = parser.parseFromString(way1, 'text/xml').getElementsByTagName('way')[0];
+  let xml2 = parser.parseFromString(way2, 'text/xml').getElementsByTagName('way')[0];
+  let xml3 = parser.parseFromString(way3, 'text/xml').getElementsByTagName('way')[0];
+  let result = BuildingShapeUtils.combineWays([xml1, xml2, xml3]);
+  expect(result.length).toBe(1);
+  expect(BuildingShapeUtils.isClosed(result[0])).toBe(true);
+  expect(BuildingShapeUtils.isSelfIntersecting(result[0])).toBe(false);
+  expect(result[0].getElementsByTagName('nd').length).toBe(4);
+});
+
+test('Test combining 3 ways 1->2->3', () => {
+  var way1 = '<way id="1"><nd ref="1"/><nd ref="2"/></way>';
+  var way2 = '<way id="2"><nd ref="1"/><nd ref="3"/></way>';
+  var way3 = '<way id="3"><nd ref="2"/><nd ref="3"/></way>';
+  var way4 = '<way id="2"><nd ref="3"/><nd ref="1"/><nd ref="2"/><nd ref="3"/></way>';
+  let parser = new window.DOMParser();
+  let xml1 = parser.parseFromString(way1, 'text/xml').getElementsByTagName('way')[0];
+  let xml2 = parser.parseFromString(way2, 'text/xml').getElementsByTagName('way')[0];
+  let xml3 = parser.parseFromString(way3, 'text/xml').getElementsByTagName('way')[0];
+  let result = BuildingShapeUtils.combineWays([xml1, xml2, xml3]);
+  expect(result.length).toBe(1);
+  expect(BuildingShapeUtils.isClosed(result[0])).toBe(true);
+  expect(BuildingShapeUtils.isSelfIntersecting(result[0])).toBe(false);
+  expect(result[0].getElementsByTagName('nd').length).toBe(4);
+});
+
+test('Test combining 4 ways', () => {
+  var way1 = '<way id="1"><nd ref="1"/><nd ref="2"/></way>';
+  var way2 = '<way id="2"><nd ref="3"/><nd ref="4"/></way>';
+  var way3 = '<way id="3"><nd ref="4"/><nd ref="1"/></way>';
+  var way4 = '<way id="4"><nd ref="2"/><nd ref="3"/></way>';
+  let parser = new window.DOMParser();
+  let xml1 = parser.parseFromString(way1, 'text/xml').getElementsByTagName('way')[0];
+  let xml2 = parser.parseFromString(way2, 'text/xml').getElementsByTagName('way')[0];
+  let xml3 = parser.parseFromString(way3, 'text/xml').getElementsByTagName('way')[0];
+  let xml4 = parser.parseFromString(way4, 'text/xml').getElementsByTagName('way')[0];
+  let result = BuildingShapeUtils.combineWays([xml1, xml2, xml3, xml4]);
+  expect(result.length).toBe(1);
+  expect(BuildingShapeUtils.isClosed(result[0]));
+  expect(BuildingShapeUtils.isSelfIntersecting(result[0])).toBe(false);
+  expect(result[0].getElementsByTagName('nd').length).toBe(5);
+});

test/utils.test.js

@@ -75,3 +75,16 @@ test('Longest side angle', () => {
   expect(rightTriangle.extractPoints().shape.length).toBe(3);
   expect(BuildingShapeUtils.longestSideAngle(rightTriangle)).toBe(-Math.PI / 4);
 });
+
+describe('isSelfIntersecting', () => {
+  test.each([
+    ['<way id="1"><nd ref="1"/><nd ref="2"/></way>', false, 'open non-intersecting'],
+    ['<way id="1"><nd ref="1"/><nd ref="2"/><nd ref="3"/><nd ref="1"/></way>', false, 'closed non-intersecting'],
+    ['<way id="1"><nd ref="1"/><nd ref="2"/><nd ref="3"/><nd ref="2"/></way>', true, 'open intersecting'],
+    ['<way id="1"><nd ref="1"/><nd ref="2"/><nd ref="3"/><nd ref="4"/><nd ref="3"/><nd ref="1"/></way>', true, 'closed intersecting'],
+  ])('${description}', (way, expected, description) => {
+    let parser = new window.DOMParser();
+    let xml = parser.parseFromString(way, 'text/xml').getElementsByTagName('way')[0];
+    expect(BuildingShapeUtils.isSelfIntersecting(xml)).toBe(expected);
+  });
+});