openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.RotationConstraint');
goog.require('ol.math');
/**
* @param {number|undefined} rotation Rotation.
* @param {number} delta Delta.
* @return {number|undefined} Rotation.
*/
ol.RotationConstraint.disable = function(rotation, delta) {
if (rotation !== undefined) {
return 0;
} else {
return undefined;
}
};
/**
* @param {number|undefined} rotation Rotation.
* @param {number} delta Delta.
* @return {number|undefined} Rotation.
*/
ol.RotationConstraint.none = function(rotation, delta) {
if (rotation !== undefined) {
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 (
/**
* @param {number|undefined} rotation Rotation.
* @param {number} delta Delta.
* @return {number|undefined} Rotation.
*/
function(rotation, delta) {
if (rotation !== undefined) {
rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;
return rotation;
} else {
return undefined;
}
});
};
/**
* @param {number=} opt_tolerance Tolerance.
* @return {ol.RotationConstraintType} Rotation constraint.
*/
ol.RotationConstraint.createSnapToZero = function(opt_tolerance) {
var tolerance = opt_tolerance || ol.math.toRadians(5);
return (
/**
* @param {number|undefined} rotation Rotation.
* @param {number} delta Delta.
* @return {number|undefined} Rotation.
*/
function(rotation, delta) {
if (rotation !== undefined) {
if (Math.abs(rotation + delta) <= tolerance) {
return 0;
} else {
return rotation + delta;
}
} else {
return undefined;
}
});
};