Lines with a 180 degree angle between them should be considered paral…

…lel (`turf-boolean-parallel`) (#2475) * Lines with a 180 degree angle between them are considered parallel * Add simple verticals test * Add failing test case for 3d lines * Fix verticals 3d test
Turfjs · Sep 19, 2023 · cc6689a · cc6689a
1 parent cf7a0c5
commit cc6689a
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diff --git a/packages/turf-boolean-parallel/index.ts b/packages/turf-boolean-parallel/index.ts
@@ -53,7 +53,7 @@ function booleanParallel(
 function isParallel(segment1: Position[], segment2: Position[]) {
  var slope1 = bearingToAzimuth(rhumbBearing(segment1[0], segment1[1]));
  var slope2 = bearingToAzimuth(rhumbBearing(segment2[0], segment2[1]));
- return slope1 === slope2;
+ return slope1 === slope2 || (slope2 - slope1) % 180 === 0;
 }
 
 /**

diff --git a/packages/turf-boolean-parallel/test/true/opposites.geojson b/packages/turf-boolean-parallel/test/true/opposites.geojson
@@ -0,0 +1,27 @@
+{
+ "type": "FeatureCollection",
+ "features": [
+ {
+ "type": "Feature",
+ "properties": {},
+ "geometry": {
+ "type": "LineString",
+ "coordinates": [
+ [0, 0],
+ [1, 0]
+ ]
+ }
+ },
+ {
+ "type": "Feature",
+ "properties": {},
+ "geometry": {
+ "type": "LineString",
+ "coordinates": [
+ [1, 0],
+ [0, 0]
+ ]
+ }
+ }
+ ]
+}
diff --git a/packages/turf-boolean-parallel/test/true/verticals.geojson b/packages/turf-boolean-parallel/test/true/verticals.geojson
@@ -0,0 +1,27 @@
+{
+ "type": "FeatureCollection",
+ "features": [
+ {
+ "type": "Feature",
+ "properties": {},
+ "geometry": {
+ "type": "LineString",
+ "coordinates": [
+ [0, 0],
+ [0, 1]
+ ]
+ }
+ },
+ {
+ "type": "Feature",
+ "properties": {},
+ "geometry": {
+ "type": "LineString",
+ "coordinates": [
+ [1, 0],
+ [1, 1]
+ ]
+ }
+ }
+ ]
+}
diff --git a/packages/turf-boolean-parallel/test/true/verticals3d.geojson b/packages/turf-boolean-parallel/test/true/verticals3d.geojson
@@ -0,0 +1,27 @@
+{
+ "type": "FeatureCollection",
+ "features": [
+ {
+ "type": "Feature",
+ "properties": {},
+ "geometry": {
+ "type": "LineString",
+ "coordinates": [
+ [-10, 20, 0],
+ [-10, 10, 0]
+ ]
+ }
+ },
+ {
+ "type": "Feature",
+ "properties": {},
+ "geometry": {
+ "type": "LineString",
+ "coordinates": [
+ [-20, 20, 0],
+ [-20, 10, 0]
+ ]
+ }
+ }
+ ]
+}