Refactor complete

browser/src/parser/pathGenerators/generateRFArc.ts

@@ -0,0 +1,77 @@
+import * as geolib from "geolib";
+
+/**
+ * @param crsIntoEndpoint Course into arc endpoint
+ * @param crsIntoOrigin Course into arc origin point
+ * @param start Arc origin point
+ * @param center Arc center point
+ * @param turnDir
+ * @returns Line segments
+ */
+export const generateRFArc = (
+  crsIntoEndpoint: number,
+  crsIntoOrigin: number,
+  start: NavFix,
+  center: NavFix,
+  turnDir: TurnDirection
+) => {
+  const line: LineSegment[] = [[start.longitude, start.latitude]];
+
+  if (crsIntoEndpoint !== crsIntoOrigin) {
+    // Turn Dir
+    if (!turnDir || turnDir === "E") {
+      let prov = crsIntoOrigin - crsIntoEndpoint;
+      prov = prov > 180 ? prov - 360 : prov <= -180 ? prov + 360 : prov;
+      turnDir = prov > 0 ? "L" : "R";
+    }
+
+    let crsOrthogonalOnOrigin;
+    let crsOrthogonalOnEndpoint;
+    if (turnDir === "R") {
+      crsOrthogonalOnOrigin = (crsIntoOrigin + 90).normaliseDegrees();
+      crsOrthogonalOnEndpoint = (crsIntoEndpoint + 90).normaliseDegrees();
+    } else {
+      crsOrthogonalOnOrigin = (crsIntoOrigin - 90).normaliseDegrees();
+      crsOrthogonalOnEndpoint = (crsIntoEndpoint - 90).normaliseDegrees();
+    }
+
+    const arcRad = geolib.getDistance(center, start);
+
+    crsOrthogonalOnOrigin = crsOrthogonalOnOrigin.reciprocalCourse();
+    crsOrthogonalOnEndpoint = crsOrthogonalOnEndpoint.reciprocalCourse();
+    // Start turn immediately
+    if (turnDir === "R") {
+      crsOrthogonalOnOrigin +=
+        crsOrthogonalOnOrigin < 1 ? crsOrthogonalOnOrigin : 1;
+    } else {
+      crsOrthogonalOnOrigin -=
+        crsOrthogonalOnOrigin < 1 ? crsOrthogonalOnOrigin : 1;
+    }
+
+    while (crsOrthogonalOnOrigin !== crsOrthogonalOnEndpoint) {
+      if (turnDir === "R") {
+        const delta = (
+          crsOrthogonalOnEndpoint - crsOrthogonalOnOrigin
+        ).normaliseDegrees();
+        crsOrthogonalOnOrigin += delta < 1 ? delta : 1;
+        crsOrthogonalOnOrigin = crsOrthogonalOnOrigin.normaliseDegrees();
+      } else {
+        const delta = (
+          crsOrthogonalOnOrigin - crsOrthogonalOnEndpoint
+        ).normaliseDegrees();
+        crsOrthogonalOnOrigin -= delta < 1 ? delta : 1;
+        crsOrthogonalOnOrigin = crsOrthogonalOnOrigin.normaliseDegrees();
+      }
+
+      const arcFix = geolib.computeDestinationPoint(
+        center,
+        arcRad,
+        crsOrthogonalOnOrigin
+      );
+
+      line.push([arcFix.longitude, arcFix.latitude]);
+    }
+  }
+
+  return line;
+};