planning

node_modules/ol/src/rotationconstraint.js

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+/**
+ * @module ol/rotationconstraint
+ */
+import {toRadians} from './math.js';
+
+/**
+ * @typedef {function((number|undefined), boolean=): (number|undefined)} Type
+ */
+
+/**
+ * @param {number|undefined} rotation Rotation.
+ * @return {number|undefined} Rotation.
+ */
+export function disable(rotation) {
+  if (rotation !== undefined) {
+    return 0;
+  } else {
+    return undefined;
+  }
+}
+
+/**
+ * @param {number|undefined} rotation Rotation.
+ * @return {number|undefined} Rotation.
+ */
+export function none(rotation) {
+  if (rotation !== undefined) {
+    return rotation;
+  } else {
+    return undefined;
+  }
+}
+
+/**
+ * @param {number} n N.
+ * @return {Type} Rotation constraint.
+ */
+export function createSnapToN(n) {
+  const theta = (2 * Math.PI) / n;
+  return (
+    /**
+     * @param {number|undefined} rotation Rotation.
+     * @param {boolean} [opt_isMoving] True if an interaction or animation is in progress.
+     * @return {number|undefined} Rotation.
+     */
+    function (rotation, opt_isMoving) {
+      if (opt_isMoving) {
+        return rotation;
+      }
+
+      if (rotation !== undefined) {
+        rotation = Math.floor(rotation / theta + 0.5) * theta;
+        return rotation;
+      } else {
+        return undefined;
+      }
+    }
+  );
+}
+
+/**
+ * @param {number} [opt_tolerance] Tolerance.
+ * @return {Type} Rotation constraint.
+ */
+export function createSnapToZero(opt_tolerance) {
+  const tolerance = opt_tolerance || toRadians(5);
+  return (
+    /**
+     * @param {number|undefined} rotation Rotation.
+     * @param {boolean} [opt_isMoving] True if an interaction or animation is in progress.
+     * @return {number|undefined} Rotation.
+     */
+    function (rotation, opt_isMoving) {
+      if (opt_isMoving) {
+        return rotation;
+      }
+
+      if (rotation !== undefined) {
+        if (Math.abs(rotation) <= tolerance) {
+          return 0;
+        } else {
+          return rotation;
+        }
+      } else {
+        return undefined;
+      }
+    }
+  );
+}