Add epsilon parameter to geoVecEqual

modules/geo/vector.js

@@ -1,6 +1,10 @@
 // vector equals
-export function geoVecEqual(a, b) {
-    return (a[0] === b[0]) && (a[1] === b[1]);
+export function geoVecEqual(a, b, epsilon) {
+    if (epsilon) {
+        return (Math.abs(a[0] - b[0]) <= epsilon) && (Math.abs(a[1] - b[1]) <= epsilon);
+    } else {
+        return (a[0] === b[0]) && (a[1] === b[1]);
+    }
 }
 
 // vector addition