lepu-test-platform-web/node_modules/echarts/lib/scale/Log.js

212 lines
6.2 KiB
JavaScript

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
var zrUtil = require("zrender/lib/core/util");
var Scale = require("./Scale");
var numberUtil = require("../util/number");
var IntervalScale = require("./Interval");
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/**
* Log scale
* @module echarts/scale/Log
*/
// Use some method of IntervalScale
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();
},
/**
* @param {boolean} [expandToNicedExtent=false] If expand the ticks to niced extent.
* @return {Array.<number>}
*/
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)); // Fix #4158
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);
},
/**
* @param {number} splitNumber
* @return {Array.<Array.<number>>}
*/
getMinorTicks: intervalScaleProto.getMinorTicks,
/**
* @param {number} val
* @return {string}
*/
getLabel: intervalScaleProto.getLabel,
/**
* @param {number} val
* @return {number}
*/
scale: function (val) {
val = scaleProto.scale.call(this, val);
return mathPow(this.base, val);
},
/**
* @param {number} start
* @param {number} end
*/
setExtent: function (start, end) {
var base = this.base;
start = mathLog(start) / mathLog(base);
end = mathLog(end) / mathLog(base);
intervalScaleProto.setExtent.call(this, start, end);
},
/**
* @return {number} 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]); // Fix #4158
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;
},
/**
* @param {Array.<number>} 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);
},
/**
* @override
*/
unionExtentFromData: function (data, dim) {
// TODO
// filter value that <= 0
this.unionExtent(data.getApproximateExtent(dim));
},
/**
* Update interval and extent of intervals for nice ticks
* @param {number} [approxTickNum = 10] Given approx tick number
*/
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; // Filter ticks to get closer to the desired count.
if (err <= 0.5) {
interval *= 10;
} // Interval should be integer
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;
},
/**
* Nice extent.
* @override
*/
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;