Internal lib - Improve smooth path generation

Author: graphieros

src/lib.js

@@ -756,8 +756,8 @@ export function createSmoothPath(points) {
         if (slopes[i - 1] * slopes[i] <= 0) {
             tangents[i] = 0;
         } else {
-            const commonSlope = (slopes[i - 1] + slopes[i]) / 2;
-            tangents[i] = Math.min(Math.abs(commonSlope), Math.abs(slopes[i - 1]), Math.abs(slopes[i])) * Math.sign(commonSlope);
+            const harmonicMean = (2 * slopes[i - 1] * slopes[i]) / (slopes[i - 1] + slopes[i]);
+            tangents[i] = harmonicMean;
         }
     }
 
@@ -766,10 +766,8 @@ export function createSmoothPath(points) {
         const y1 = points[i].y;
         const x2 = points[i + 1].x;
         const y2 = points[i + 1].y;
-
         const m1 = tangents[i];
         const m2 = tangents[i + 1];
-
         const controlX1 = x1 + (x2 - x1) / 3;
         const controlY1 = y1 + m1 * (x2 - x1) / 3;
         const controlX2 = x2 - (x2 - x1) / 3;
@@ -781,6 +779,7 @@ export function createSmoothPath(points) {
     return path.join(' ');
 }
 
+
 export function createUid() {
     return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
         .replace(/[xy]/g, function (c) {