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- var zrUtil = require("zrender/lib/core/util");
- var Scale = require("./Scale");
- var numberUtil = require("../util/number");
- var IntervalScale = require("./Interval");
- var scaleProto = Scale.prototype;
- var intervalScaleProto = IntervalScale.prototype;
- var getPrecisionSafe = numberUtil.getPrecisionSafe;
- var roundingErrorFix = numberUtil.round;
- var mathFloor = Math.floor;
- var mathCeil = Math.ceil;
- var mathPow = Math.pow;
- var mathLog = Math.log;
- var LogScale = Scale.extend({
- type: 'log',
- base: 10,
- $constructor: function () {
- Scale.apply(this, arguments);
- this._originalScale = new IntervalScale();
- },
-
- getTicks: function (expandToNicedExtent) {
- var originalScale = this._originalScale;
- var extent = this._extent;
- var originalExtent = originalScale.getExtent();
- return zrUtil.map(intervalScaleProto.getTicks.call(this, expandToNicedExtent), function (val) {
- var powVal = numberUtil.round(mathPow(this.base, val));
- powVal = val === extent[0] && originalScale.__fixMin ? fixRoundingError(powVal, originalExtent[0]) : powVal;
- powVal = val === extent[1] && originalScale.__fixMax ? fixRoundingError(powVal, originalExtent[1]) : powVal;
- return powVal;
- }, this);
- },
-
- getMinorTicks: intervalScaleProto.getMinorTicks,
-
- getLabel: intervalScaleProto.getLabel,
-
- scale: function (val) {
- val = scaleProto.scale.call(this, val);
- return mathPow(this.base, val);
- },
-
- setExtent: function (start, end) {
- var base = this.base;
- start = mathLog(start) / mathLog(base);
- end = mathLog(end) / mathLog(base);
- intervalScaleProto.setExtent.call(this, start, end);
- },
-
- getExtent: function () {
- var base = this.base;
- var extent = scaleProto.getExtent.call(this);
- extent[0] = mathPow(base, extent[0]);
- extent[1] = mathPow(base, extent[1]);
- var originalScale = this._originalScale;
- var originalExtent = originalScale.getExtent();
- originalScale.__fixMin && (extent[0] = fixRoundingError(extent[0], originalExtent[0]));
- originalScale.__fixMax && (extent[1] = fixRoundingError(extent[1], originalExtent[1]));
- return extent;
- },
-
- unionExtent: function (extent) {
- this._originalScale.unionExtent(extent);
- var base = this.base;
- extent[0] = mathLog(extent[0]) / mathLog(base);
- extent[1] = mathLog(extent[1]) / mathLog(base);
- scaleProto.unionExtent.call(this, extent);
- },
-
- unionExtentFromData: function (data, dim) {
-
-
- this.unionExtent(data.getApproximateExtent(dim));
- },
-
- niceTicks: function (approxTickNum) {
- approxTickNum = approxTickNum || 10;
- var extent = this._extent;
- var span = extent[1] - extent[0];
- if (span === Infinity || span <= 0) {
- return;
- }
- var interval = numberUtil.quantity(span);
- var err = approxTickNum / span * interval;
- if (err <= 0.5) {
- interval *= 10;
- }
- while (!isNaN(interval) && Math.abs(interval) < 1 && Math.abs(interval) > 0) {
- interval *= 10;
- }
- var niceExtent = [numberUtil.round(mathCeil(extent[0] / interval) * interval), numberUtil.round(mathFloor(extent[1] / interval) * interval)];
- this._interval = interval;
- this._niceExtent = niceExtent;
- },
-
- niceExtent: function (opt) {
- intervalScaleProto.niceExtent.call(this, opt);
- var originalScale = this._originalScale;
- originalScale.__fixMin = opt.fixMin;
- originalScale.__fixMax = opt.fixMax;
- }
- });
- zrUtil.each(['contain', 'normalize'], function (methodName) {
- LogScale.prototype[methodName] = function (val) {
- val = mathLog(val) / mathLog(this.base);
- return scaleProto[methodName].call(this, val);
- };
- });
- LogScale.create = function () {
- return new LogScale();
- };
- function fixRoundingError(val, originalVal) {
- return roundingErrorFix(val, getPrecisionSafe(originalVal));
- }
- var _default = LogScale;
- module.exports = _default;
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