72 lines
1.7 KiB
JavaScript
72 lines
1.7 KiB
JavaScript
goog.provide('ol.RotationConstraint');
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goog.provide('ol.RotationConstraintType');
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/**
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* @typedef {function((number|undefined), number): (number|undefined)}
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*/
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ol.RotationConstraintType;
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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ol.RotationConstraint.none = function(rotation, delta) {
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if (goog.isDef(rotation)) {
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return rotation + delta;
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} else {
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return undefined;
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}
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};
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/**
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* @param {number} n N.
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* @return {ol.RotationConstraintType} Rotation constraint.
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*/
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ol.RotationConstraint.createSnapToN = function(n) {
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var theta = 2 * Math.PI / n;
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return (
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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function(rotation, delta) {
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if (goog.isDef(rotation)) {
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rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;
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return rotation;
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} else {
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return undefined;
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}
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});
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};
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/**
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* @param {number=} opt_tolerance Tolerance.
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* @return {ol.RotationConstraintType} Rotation constraint.
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*/
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ol.RotationConstraint.createSnapToZero = function(opt_tolerance) {
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var tolerance = opt_tolerance || 0.1;
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return (
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/**
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* @param {number|undefined} rotation Rotation.
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* @param {number} delta Delta.
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* @return {number|undefined} Rotation.
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*/
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function(rotation, delta) {
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if (goog.isDef(rotation)) {
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if (Math.abs(rotation + delta) <= tolerance) {
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return 0;
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} else {
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return rotation + delta;
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}
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} else {
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return undefined;
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}
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});
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};
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