74 lines
2.0 KiB
JavaScript
74 lines
2.0 KiB
JavaScript
goog.provide('ol.ResolutionConstraint');
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goog.provide('ol.ResolutionConstraintType');
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goog.require('goog.math');
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goog.require('ol.array');
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/**
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* @typedef {function((number|undefined), number): (number|undefined)}
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*/
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ol.ResolutionConstraintType;
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/**
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* @param {number} power Power.
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* @param {number} maxResolution Maximum resolution.
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* @param {number=} opt_minResolution Minimum resolution.
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* @return {ol.ResolutionConstraintType} Zoom function.
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*/
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ol.ResolutionConstraint.createContinuous =
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function(power, maxResolution, opt_minResolution) {
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var minResolution = opt_minResolution || 0;
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return function(resolution, delta) {
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if (goog.isDef(resolution)) {
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resolution /= Math.pow(power, delta);
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return goog.math.clamp(resolution, minResolution, maxResolution);
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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 {Array.<number>} resolutions Resolutions.
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* @return {ol.ResolutionConstraintType} Zoom function.
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*/
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ol.ResolutionConstraint.createSnapToResolutions =
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function(resolutions) {
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return function(resolution, delta) {
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if (goog.isDef(resolution)) {
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var z = ol.array.linearFindNearest(resolutions, resolution);
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z = goog.math.clamp(z + delta, 0, resolutions.length - 1);
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return resolutions[z];
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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} power Power.
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* @param {number} maxResolution Maximum resolution.
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* @param {number=} opt_maxLevel Maximum level.
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* @return {ol.ResolutionConstraintType} Zoom function.
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*/
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ol.ResolutionConstraint.createSnapToPower =
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function(power, maxResolution, opt_maxLevel) {
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return function(resolution, delta) {
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if (goog.isDef(resolution)) {
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var oldLevel = Math.floor(
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Math.log(maxResolution / resolution) / Math.log(power) + 0.5);
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var newLevel = Math.max(oldLevel + delta, 0);
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if (goog.isDef(opt_maxLevel)) {
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newLevel = Math.min(newLevel, opt_maxLevel);
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}
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return maxResolution / Math.pow(power, newLevel);
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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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