308 lines
8.7 KiB
JavaScript
308 lines
8.7 KiB
JavaScript
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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var numberUtil = require("../util/number");
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var formatUtil = require("../util/format");
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var Scale = require("./Scale");
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var helper = require("./helper");
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/**
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* Interval scale
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* @module echarts/scale/Interval
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*/
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var roundNumber = numberUtil.round;
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/**
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* @alias module:echarts/coord/scale/Interval
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* @constructor
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*/
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var IntervalScale = Scale.extend({
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type: 'interval',
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_interval: 0,
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_intervalPrecision: 2,
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setExtent: function (start, end) {
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var thisExtent = this._extent; //start,end may be a Number like '25',so...
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if (!isNaN(start)) {
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thisExtent[0] = parseFloat(start);
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}
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if (!isNaN(end)) {
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thisExtent[1] = parseFloat(end);
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}
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},
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unionExtent: function (other) {
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var extent = this._extent;
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other[0] < extent[0] && (extent[0] = other[0]);
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other[1] > extent[1] && (extent[1] = other[1]); // unionExtent may called by it's sub classes
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IntervalScale.prototype.setExtent.call(this, extent[0], extent[1]);
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},
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/**
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* Get interval
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*/
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getInterval: function () {
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return this._interval;
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},
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/**
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* Set interval
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*/
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setInterval: function (interval) {
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this._interval = interval; // Dropped auto calculated niceExtent and use user setted extent
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// We assume user wan't to set both interval, min, max to get a better result
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this._niceExtent = this._extent.slice();
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this._intervalPrecision = helper.getIntervalPrecision(interval);
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},
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/**
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* @param {boolean} [expandToNicedExtent=false] If expand the ticks to niced extent.
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* @return {Array.<number>}
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*/
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getTicks: function (expandToNicedExtent) {
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var interval = this._interval;
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var extent = this._extent;
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var niceTickExtent = this._niceExtent;
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var intervalPrecision = this._intervalPrecision;
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var ticks = []; // If interval is 0, return [];
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if (!interval) {
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return ticks;
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} // Consider this case: using dataZoom toolbox, zoom and zoom.
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var safeLimit = 10000;
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if (extent[0] < niceTickExtent[0]) {
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if (expandToNicedExtent) {
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ticks.push(roundNumber(niceTickExtent[0] - interval, intervalPrecision));
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} else {
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ticks.push(extent[0]);
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}
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}
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var tick = niceTickExtent[0];
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while (tick <= niceTickExtent[1]) {
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ticks.push(tick); // Avoid rounding error
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tick = roundNumber(tick + interval, intervalPrecision);
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if (tick === ticks[ticks.length - 1]) {
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// Consider out of safe float point, e.g.,
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// -3711126.9907707 + 2e-10 === -3711126.9907707
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break;
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}
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if (ticks.length > safeLimit) {
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return [];
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}
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} // Consider this case: the last item of ticks is smaller
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// than niceTickExtent[1] and niceTickExtent[1] === extent[1].
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var lastNiceTick = ticks.length ? ticks[ticks.length - 1] : niceTickExtent[1];
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if (extent[1] > lastNiceTick) {
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if (expandToNicedExtent) {
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ticks.push(roundNumber(lastNiceTick + interval, intervalPrecision));
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} else {
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ticks.push(extent[1]);
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}
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}
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return ticks;
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},
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/**
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* @param {number} [splitNumber=5]
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* @return {Array.<Array.<number>>}
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*/
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getMinorTicks: function (splitNumber) {
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var ticks = this.getTicks(true);
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var minorTicks = [];
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var extent = this.getExtent();
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for (var i = 1; i < ticks.length; i++) {
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var nextTick = ticks[i];
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var prevTick = ticks[i - 1];
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var count = 0;
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var minorTicksGroup = [];
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var interval = nextTick - prevTick;
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var minorInterval = interval / splitNumber;
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while (count < splitNumber - 1) {
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var minorTick = numberUtil.round(prevTick + (count + 1) * minorInterval); // For the first and last interval. The count may be less than splitNumber.
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if (minorTick > extent[0] && minorTick < extent[1]) {
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minorTicksGroup.push(minorTick);
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}
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count++;
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}
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minorTicks.push(minorTicksGroup);
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}
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return minorTicks;
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},
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/**
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* @param {number} data
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* @param {Object} [opt]
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* @param {number|string} [opt.precision] If 'auto', use nice presision.
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* @param {boolean} [opt.pad] returns 1.50 but not 1.5 if precision is 2.
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* @return {string}
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*/
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getLabel: function (data, opt) {
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if (data == null) {
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return '';
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}
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var precision = opt && opt.precision;
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if (precision == null) {
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precision = numberUtil.getPrecisionSafe(data) || 0;
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} else if (precision === 'auto') {
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// Should be more precise then tick.
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precision = this._intervalPrecision;
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} // (1) If `precision` is set, 12.005 should be display as '12.00500'.
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// (2) Use roundNumber (toFixed) to avoid scientific notation like '3.5e-7'.
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data = roundNumber(data, precision, true);
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return formatUtil.addCommas(data);
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},
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/**
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* Update interval and extent of intervals for nice ticks
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*
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* @param {number} [splitNumber = 5] Desired number of ticks
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* @param {number} [minInterval]
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* @param {number} [maxInterval]
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*/
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niceTicks: function (splitNumber, minInterval, maxInterval) {
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splitNumber = splitNumber || 5;
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var extent = this._extent;
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var span = extent[1] - extent[0];
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if (!isFinite(span)) {
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return;
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} // User may set axis min 0 and data are all negative
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// FIXME If it needs to reverse ?
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if (span < 0) {
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span = -span;
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extent.reverse();
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}
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var result = helper.intervalScaleNiceTicks(extent, splitNumber, minInterval, maxInterval);
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this._intervalPrecision = result.intervalPrecision;
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this._interval = result.interval;
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this._niceExtent = result.niceTickExtent;
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},
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/**
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* Nice extent.
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* @param {Object} opt
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* @param {number} [opt.splitNumber = 5] Given approx tick number
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* @param {boolean} [opt.fixMin=false]
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* @param {boolean} [opt.fixMax=false]
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* @param {boolean} [opt.minInterval]
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* @param {boolean} [opt.maxInterval]
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*/
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niceExtent: function (opt) {
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var extent = this._extent; // If extent start and end are same, expand them
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if (extent[0] === extent[1]) {
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if (extent[0] !== 0) {
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// Expand extent
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var expandSize = extent[0]; // In the fowllowing case
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// Axis has been fixed max 100
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// Plus data are all 100 and axis extent are [100, 100].
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// Extend to the both side will cause expanded max is larger than fixed max.
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// So only expand to the smaller side.
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if (!opt.fixMax) {
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extent[1] += expandSize / 2;
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extent[0] -= expandSize / 2;
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} else {
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extent[0] -= expandSize / 2;
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}
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} else {
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extent[1] = 1;
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}
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}
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var span = extent[1] - extent[0]; // If there are no data and extent are [Infinity, -Infinity]
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if (!isFinite(span)) {
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extent[0] = 0;
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extent[1] = 1;
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}
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this.niceTicks(opt.splitNumber, opt.minInterval, opt.maxInterval); // var extent = this._extent;
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var interval = this._interval;
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if (!opt.fixMin) {
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extent[0] = roundNumber(Math.floor(extent[0] / interval) * interval);
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}
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if (!opt.fixMax) {
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extent[1] = roundNumber(Math.ceil(extent[1] / interval) * interval);
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}
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}
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});
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/**
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* @return {module:echarts/scale/Time}
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*/
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IntervalScale.create = function () {
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return new IntervalScale();
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};
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var _default = IntervalScale;
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module.exports = _default; |