Move squaredDistance and squaredSegmentDistance into ol.math

src/ol/math.js

@@ -59,6 +59,49 @@ ol.math.sinh = function(x) {
 };
 
 
+/**
+ * Returns the square of the closest distance between the point (x, y) and the
+ * line segment (x1, y1) to (x2, y2).
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @param {number} x1 X1.
+ * @param {number} y1 Y1.
+ * @param {number} x2 X2.
+ * @param {number} y2 Y2.
+ * @return {number} Squared distance.
+ */
+ol.math.squaredSegmentDistance = function(x, y, x1, y1, x2, y2) {
+  var dx = x2 - x1;
+  var dy = y2 - y1;
+  if (dx !== 0 || dy !== 0) {
+    var t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);
+    if (t > 1) {
+      x1 = x2;
+      y1 = y2;
+    } else if (t > 0) {
+      x1 += dx * t;
+      y1 += dy * t;
+    }
+  }
+  return ol.math.squaredDistance(x, y, x1, y1);
+};
+
+
+/**
+ * Returns the square of the distance between the points (x1, y1) and (x2, y2).
+ * @param {number} x1 X1.
+ * @param {number} y1 Y1.
+ * @param {number} x2 X2.
+ * @param {number} y2 Y2.
+ * @return {number} Squared distance.
+ */
+ol.math.squaredDistance = function(x1, y1, x2, y2) {
+  var dx = x2 - x1;
+  var dy = y2 - y1;
+  return dx * dx + dy * dy;
+};
+
+
 /**
  * @param {number} x X.
  * @return {number} Hyperbolic tangent of x.