323 lines
12 KiB
JavaScript
323 lines
12 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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/**
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* AUTO-GENERATED FILE. DO NOT MODIFY.
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*/
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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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import * as zrUtil from 'zrender/lib/core/util.js';
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import * as textContain from 'zrender/lib/contain/text.js';
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import { makeInner } from '../util/model.js';
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import { makeLabelFormatter, getOptionCategoryInterval, shouldShowAllLabels } from './axisHelper.js';
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var inner = makeInner();
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export function createAxisLabels(axis) {
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// Only ordinal scale support tick interval
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return axis.type === 'category' ? makeCategoryLabels(axis) : makeRealNumberLabels(axis);
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}
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/**
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* @param {module:echats/coord/Axis} axis
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* @param {module:echarts/model/Model} tickModel For example, can be axisTick, splitLine, splitArea.
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* @return {Object} {
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* ticks: Array.<number>
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* tickCategoryInterval: number
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* }
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*/
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export function createAxisTicks(axis, tickModel) {
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// Only ordinal scale support tick interval
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return axis.type === 'category' ? makeCategoryTicks(axis, tickModel) : {
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ticks: zrUtil.map(axis.scale.getTicks(), function (tick) {
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return tick.value;
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})
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};
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}
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function makeCategoryLabels(axis) {
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var labelModel = axis.getLabelModel();
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var result = makeCategoryLabelsActually(axis, labelModel);
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return !labelModel.get('show') || axis.scale.isBlank() ? {
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labels: [],
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labelCategoryInterval: result.labelCategoryInterval
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} : result;
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}
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function makeCategoryLabelsActually(axis, labelModel) {
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var labelsCache = getListCache(axis, 'labels');
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var optionLabelInterval = getOptionCategoryInterval(labelModel);
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var result = listCacheGet(labelsCache, optionLabelInterval);
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if (result) {
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return result;
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}
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var labels;
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var numericLabelInterval;
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if (zrUtil.isFunction(optionLabelInterval)) {
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labels = makeLabelsByCustomizedCategoryInterval(axis, optionLabelInterval);
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} else {
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numericLabelInterval = optionLabelInterval === 'auto' ? makeAutoCategoryInterval(axis) : optionLabelInterval;
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labels = makeLabelsByNumericCategoryInterval(axis, numericLabelInterval);
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}
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// Cache to avoid calling interval function repeatedly.
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return listCacheSet(labelsCache, optionLabelInterval, {
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labels: labels,
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labelCategoryInterval: numericLabelInterval
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});
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}
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function makeCategoryTicks(axis, tickModel) {
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var ticksCache = getListCache(axis, 'ticks');
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var optionTickInterval = getOptionCategoryInterval(tickModel);
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var result = listCacheGet(ticksCache, optionTickInterval);
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if (result) {
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return result;
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}
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var ticks;
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var tickCategoryInterval;
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// Optimize for the case that large category data and no label displayed,
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// we should not return all ticks.
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if (!tickModel.get('show') || axis.scale.isBlank()) {
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ticks = [];
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}
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if (zrUtil.isFunction(optionTickInterval)) {
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ticks = makeLabelsByCustomizedCategoryInterval(axis, optionTickInterval, true);
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}
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// Always use label interval by default despite label show. Consider this
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// scenario, Use multiple grid with the xAxis sync, and only one xAxis shows
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// labels. `splitLine` and `axisTick` should be consistent in this case.
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else if (optionTickInterval === 'auto') {
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var labelsResult = makeCategoryLabelsActually(axis, axis.getLabelModel());
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tickCategoryInterval = labelsResult.labelCategoryInterval;
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ticks = zrUtil.map(labelsResult.labels, function (labelItem) {
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return labelItem.tickValue;
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});
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} else {
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tickCategoryInterval = optionTickInterval;
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ticks = makeLabelsByNumericCategoryInterval(axis, tickCategoryInterval, true);
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}
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// Cache to avoid calling interval function repeatedly.
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return listCacheSet(ticksCache, optionTickInterval, {
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ticks: ticks,
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tickCategoryInterval: tickCategoryInterval
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});
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}
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function makeRealNumberLabels(axis) {
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var ticks = axis.scale.getTicks();
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var labelFormatter = makeLabelFormatter(axis);
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return {
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labels: zrUtil.map(ticks, function (tick, idx) {
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return {
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level: tick.level,
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formattedLabel: labelFormatter(tick, idx),
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rawLabel: axis.scale.getLabel(tick),
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tickValue: tick.value
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};
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})
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};
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}
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function getListCache(axis, prop) {
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// Because key can be a function, and cache size always is small, we use array cache.
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return inner(axis)[prop] || (inner(axis)[prop] = []);
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}
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function listCacheGet(cache, key) {
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for (var i = 0; i < cache.length; i++) {
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if (cache[i].key === key) {
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return cache[i].value;
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}
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}
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}
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function listCacheSet(cache, key, value) {
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cache.push({
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key: key,
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value: value
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});
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return value;
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}
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function makeAutoCategoryInterval(axis) {
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var result = inner(axis).autoInterval;
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return result != null ? result : inner(axis).autoInterval = axis.calculateCategoryInterval();
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}
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/**
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* Calculate interval for category axis ticks and labels.
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* To get precise result, at least one of `getRotate` and `isHorizontal`
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* should be implemented in axis.
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*/
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export function calculateCategoryInterval(axis) {
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var params = fetchAutoCategoryIntervalCalculationParams(axis);
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var labelFormatter = makeLabelFormatter(axis);
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var rotation = (params.axisRotate - params.labelRotate) / 180 * Math.PI;
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var ordinalScale = axis.scale;
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var ordinalExtent = ordinalScale.getExtent();
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// Providing this method is for optimization:
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// avoid generating a long array by `getTicks`
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// in large category data case.
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var tickCount = ordinalScale.count();
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if (ordinalExtent[1] - ordinalExtent[0] < 1) {
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return 0;
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}
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var step = 1;
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// Simple optimization. Empirical value: tick count should less than 40.
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if (tickCount > 40) {
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step = Math.max(1, Math.floor(tickCount / 40));
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}
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var tickValue = ordinalExtent[0];
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var unitSpan = axis.dataToCoord(tickValue + 1) - axis.dataToCoord(tickValue);
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var unitW = Math.abs(unitSpan * Math.cos(rotation));
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var unitH = Math.abs(unitSpan * Math.sin(rotation));
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var maxW = 0;
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var maxH = 0;
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// Caution: Performance sensitive for large category data.
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// Consider dataZoom, we should make appropriate step to avoid O(n) loop.
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for (; tickValue <= ordinalExtent[1]; tickValue += step) {
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var width = 0;
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var height = 0;
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// Not precise, do not consider align and vertical align
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// and each distance from axis line yet.
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var rect = textContain.getBoundingRect(labelFormatter({
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value: tickValue
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}), params.font, 'center', 'top');
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// Magic number
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width = rect.width * 1.3;
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height = rect.height * 1.3;
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// Min size, void long loop.
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maxW = Math.max(maxW, width, 7);
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maxH = Math.max(maxH, height, 7);
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}
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var dw = maxW / unitW;
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var dh = maxH / unitH;
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// 0/0 is NaN, 1/0 is Infinity.
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isNaN(dw) && (dw = Infinity);
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isNaN(dh) && (dh = Infinity);
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var interval = Math.max(0, Math.floor(Math.min(dw, dh)));
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var cache = inner(axis.model);
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var axisExtent = axis.getExtent();
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var lastAutoInterval = cache.lastAutoInterval;
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var lastTickCount = cache.lastTickCount;
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// Use cache to keep interval stable while moving zoom window,
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// otherwise the calculated interval might jitter when the zoom
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// window size is close to the interval-changing size.
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// For example, if all of the axis labels are `a, b, c, d, e, f, g`.
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// The jitter will cause that sometimes the displayed labels are
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// `a, d, g` (interval: 2) sometimes `a, c, e`(interval: 1).
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if (lastAutoInterval != null && lastTickCount != null && Math.abs(lastAutoInterval - interval) <= 1 && Math.abs(lastTickCount - tickCount) <= 1
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// Always choose the bigger one, otherwise the critical
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// point is not the same when zooming in or zooming out.
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&& lastAutoInterval > interval
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// If the axis change is caused by chart resize, the cache should not
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// be used. Otherwise some hidden labels might not be shown again.
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&& cache.axisExtent0 === axisExtent[0] && cache.axisExtent1 === axisExtent[1]) {
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interval = lastAutoInterval;
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}
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// Only update cache if cache not used, otherwise the
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// changing of interval is too insensitive.
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else {
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cache.lastTickCount = tickCount;
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cache.lastAutoInterval = interval;
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cache.axisExtent0 = axisExtent[0];
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cache.axisExtent1 = axisExtent[1];
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}
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return interval;
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}
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function fetchAutoCategoryIntervalCalculationParams(axis) {
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var labelModel = axis.getLabelModel();
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return {
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axisRotate: axis.getRotate ? axis.getRotate() : axis.isHorizontal && !axis.isHorizontal() ? 90 : 0,
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labelRotate: labelModel.get('rotate') || 0,
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font: labelModel.getFont()
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};
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}
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function makeLabelsByNumericCategoryInterval(axis, categoryInterval, onlyTick) {
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var labelFormatter = makeLabelFormatter(axis);
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var ordinalScale = axis.scale;
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var ordinalExtent = ordinalScale.getExtent();
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var labelModel = axis.getLabelModel();
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var result = [];
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// TODO: axisType: ordinalTime, pick the tick from each month/day/year/...
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var step = Math.max((categoryInterval || 0) + 1, 1);
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var startTick = ordinalExtent[0];
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var tickCount = ordinalScale.count();
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// Calculate start tick based on zero if possible to keep label consistent
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// while zooming and moving while interval > 0. Otherwise the selection
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// of displayable ticks and symbols probably keep changing.
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// 3 is empirical value.
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if (startTick !== 0 && step > 1 && tickCount / step > 2) {
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startTick = Math.round(Math.ceil(startTick / step) * step);
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}
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// (1) Only add min max label here but leave overlap checking
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// to render stage, which also ensure the returned list
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// suitable for splitLine and splitArea rendering.
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// (2) Scales except category always contain min max label so
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// do not need to perform this process.
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var showAllLabel = shouldShowAllLabels(axis);
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var includeMinLabel = labelModel.get('showMinLabel') || showAllLabel;
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var includeMaxLabel = labelModel.get('showMaxLabel') || showAllLabel;
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if (includeMinLabel && startTick !== ordinalExtent[0]) {
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addItem(ordinalExtent[0]);
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}
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// Optimize: avoid generating large array by `ordinalScale.getTicks()`.
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var tickValue = startTick;
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for (; tickValue <= ordinalExtent[1]; tickValue += step) {
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addItem(tickValue);
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}
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if (includeMaxLabel && tickValue - step !== ordinalExtent[1]) {
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addItem(ordinalExtent[1]);
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}
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function addItem(tickValue) {
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var tickObj = {
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value: tickValue
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};
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result.push(onlyTick ? tickValue : {
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formattedLabel: labelFormatter(tickObj),
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rawLabel: ordinalScale.getLabel(tickObj),
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tickValue: tickValue
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});
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}
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return result;
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}
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function makeLabelsByCustomizedCategoryInterval(axis, categoryInterval, onlyTick) {
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var ordinalScale = axis.scale;
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var labelFormatter = makeLabelFormatter(axis);
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var result = [];
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zrUtil.each(ordinalScale.getTicks(), function (tick) {
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var rawLabel = ordinalScale.getLabel(tick);
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var tickValue = tick.value;
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if (categoryInterval(tick.value, rawLabel)) {
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result.push(onlyTick ? tickValue : {
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formattedLabel: labelFormatter(tick),
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rawLabel: rawLabel,
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tickValue: tickValue
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});
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}
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});
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return result;
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} |