Added Track start and end angle functions

+Added Track.getStartAngleXZ and .getEndAngleXZ function and implemented them in its child classes

src/model/tracks/bezier-track.js

@@ -22,6 +22,14 @@ export default class BezierTrack extends Track
         });
     }
 
+    getStartAngleXZ() {
+        return this.points.start.atanY(this.points.control1);
+    }
+
+    getEndAngleXZ() {
+        return this.points.control2.atanY(this.points.end);
+    }
+
     static fromText(text) {
         const values = text.split(";");
         const track = new BezierTrack(

src/model/tracks/point-track.js

@@ -19,6 +19,20 @@ export default class PointTrack extends Track
         });
     }
 
+    getStartAngleXZ() {
+        return AngleHelper.degToRad(this.rot.y);
+    }
+
+    getEndAngleXZ() {
+        const startAngle = AngleHelper.degToRad(this.rot.y);
+
+        if(this.r === 0) {
+            return startAngle;
+        }
+
+        return startAngle - this.len / this.r;
+    }
+
     static _getRotLen(start, end, r) {
         // TODO: include track slope in calculations
         const pointsAngle = start.atanY(end);

src/model/tracks/standard-track.js

@@ -16,6 +16,20 @@ export default class StandardTrack extends Track
         this._calcPoints();
     }
 
+    getStartAngleXZ() {
+        return AngleHelper.degToRad(this.rot.y);
+    }
+
+    getEndAngleXZ() {
+        const startAngle = AngleHelper.degToRad(this.rot.y);
+
+        if(this.r === 0) {
+            return startAngle
+        }
+
+        return startAngle - this.len / this.r;
+    }
+
     static fromText(text) {
         const values = text.split(";");
         const track = new StandardTrack(

src/model/tracks/track.js

@@ -34,6 +34,14 @@ export default class Track extends SceneryObject {
         });
     }
 
+    getStartAngleXZ() {
+        throw new Error("getStartAngleXZ() must be implemented in subclass");
+    }
+
+    getEndAngleXZ() {
+        throw new Error("getEndAngleXZ() must be implemented in subclass");
+    }
+
     static slopesFromText(text) {
         return text.split(",", 2);
     }