ccfacc5ee6
Using the [ts.js codemod](https://gist.github.com/tschaub/1ea498c9d1e5268cf36d212b3949be4e): jscodeshift --transform ts.js src
73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
/**
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* @module ol/resolutionconstraint
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*/
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import {linearFindNearest} from './array.js';
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import {clamp} from './math.js';
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/**
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* @typedef {function((number|undefined), number, number): (number|undefined)} Type
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*/
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/**
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* @param {Array<number>} resolutions Resolutions.
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* @return {Type} Zoom function.
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*/
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export function createSnapToResolutions(resolutions) {
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return (
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/**
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* @param {number|undefined} resolution Resolution.
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* @param {number} delta Delta.
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* @param {number} direction Direction.
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* @return {number|undefined} Resolution.
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*/
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function(resolution, delta, direction) {
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if (resolution !== undefined) {
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let z = linearFindNearest(resolutions, resolution, direction);
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z = clamp(z + delta, 0, resolutions.length - 1);
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const index = Math.floor(z);
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if (z != index && index < resolutions.length - 1) {
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const power = resolutions[index] / resolutions[index + 1];
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return resolutions[index] / Math.pow(power, z - index);
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} else {
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return resolutions[index];
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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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}
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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 {Type} Zoom function.
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*/
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export function createSnapToPower(power, maxResolution, opt_maxLevel) {
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return (
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/**
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* @param {number|undefined} resolution Resolution.
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* @param {number} delta Delta.
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* @param {number} direction Direction.
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* @return {number|undefined} Resolution.
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*/
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function(resolution, delta, direction) {
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if (resolution !== undefined) {
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const offset = -direction / 2 + 0.5;
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const oldLevel = Math.floor(
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Math.log(maxResolution / resolution) / Math.log(power) + offset);
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let newLevel = Math.max(oldLevel + delta, 0);
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if (opt_maxLevel !== undefined) {
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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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