devextreme
Version:
JavaScript/TypeScript Component Suite for Responsive Web Development
47 lines (46 loc) • 2.06 kB
JavaScript
/**
* DevExtreme (esm/__internal/viz/translators/logarithmic_translator.js)
* Version: 25.2.7
* Build date: Tue May 05 2026
*
* Copyright (c) 2012 - 2026 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import {
isDefined
} from "../../../core/utils/type";
import {
getLogExt as getLog,
raiseToExt as raiseTo
} from "../../viz/core/utils";
export default {
fromValue(value) {
return null !== value ? getLog(value, this._canvasOptions.base, this._businessRange.allowNegatives, this._businessRange.linearThreshold) : value
},
toValue(value) {
return null !== value ? raiseTo(value, this._canvasOptions.base, this._businessRange.allowNegatives, this._businessRange.linearThreshold) : value
},
getMinBarSize(minBarSize) {
const visibleArea = this.getCanvasVisibleArea();
const minValue = this.from(visibleArea.min + minBarSize);
const canvasOptions = this._canvasOptions;
const startValue = this.fromValue(this.from(visibleArea.min));
const endValue = this.fromValue(minValue ?? this.from(visibleArea.max));
const value = Math.abs(startValue - endValue);
return canvasOptions.base ** value
},
checkMinBarSize(initialValue, minShownValue, stackValue) {
const canvasOptions = this._canvasOptions;
const prevValue = stackValue ? stackValue - initialValue : 0;
const baseMethod = this.constructor.prototype.checkMinBarSize;
let minBarSize;
let updateValue;
if (isDefined(minShownValue) && prevValue > 0) {
minBarSize = baseMethod(this.fromValue(stackValue / prevValue), this.fromValue(minShownValue) - canvasOptions.rangeMinVisible);
updateValue = canvasOptions.base ** (this.fromValue(prevValue) + minBarSize) - prevValue
} else {
updateValue = baseMethod(initialValue, minShownValue)
}
return updateValue
}
};