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openlayers

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Build tools and sources for developing OpenLayers based mapping applications

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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; } }); };