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Small performance improvement by saving the calculated logarithm.

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Maximilian Krög
2019-12-20 23:04:09 +01:00
parent caefe8c85b
commit d7eaacf923
1 changed files with 3 additions and 3 deletions
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src/ol/View.js
+3 -3
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@@ -976,17 +976,17 @@ class View extends BaseObject {
* @return {function(number): number} Value for resolution function. * @return {function(number): number} Value for resolution function.
*/ */
getValueForResolutionFunction(opt_power) { getValueForResolutionFunction(opt_power) {
const power = opt_power || 2; const logPower = Math.log(opt_power || 2);
const maxResolution = this.maxResolution_; const maxResolution = this.maxResolution_;
const minResolution = this.minResolution_; const minResolution = this.minResolution_;
const max = Math.log(maxResolution / minResolution) / Math.log(power); const max = Math.log(maxResolution / minResolution) / logPower;
return ( return (
/** /**
* @param {number} resolution Resolution. * @param {number} resolution Resolution.
* @return {number} Value. * @return {number} Value.
*/ */
function(resolution) { function(resolution) {
const value = (Math.log(maxResolution / resolution) / Math.log(power)) / max; const value = (Math.log(maxResolution / resolution) / logPower) / max;
return value; return value;
}); });
} }