Constraint objects moved to ol namespace from ol.interaction namespace

src/ol/rotationconstraint.js

@@ -0,0 +1,39 @@
+goog.provide('ol.RotationConstraint');
+goog.provide('ol.RotationConstraintType');
+
+
+/**
+ * @typedef {function((number|undefined), number): (number|undefined)}
+ */
+ol.RotationConstraintType;
+
+
+/**
+ * @param {number|undefined} rotation Rotation.
+ * @param {number} delta Delta.
+ * @return {number|undefined} Rotation.
+ */
+ol.RotationConstraint.none = function(rotation, delta) {
+  if (goog.isDef(rotation)) {
+    return rotation + delta;
+  } else {
+    return undefined;
+  }
+};
+
+
+/**
+ * @param {number} n N.
+ * @return {ol.RotationConstraintType} Rotation constraint.
+ */
+ol.RotationConstraint.createSnapToN = function(n) {
+  var theta = 2 * Math.PI / n;
+  return function(rotation, delta) {
+    if (goog.isDef(rotation)) {
+      rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;
+      return rotation;
+    } else {
+      return undefined;
+    }
+  };
+};