/*
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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 textContain from 'zrender/src/contain/text';
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import Axis from '../Axis';
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import {makeInner} from '../../util/model';
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import Scale from '../../scale/Scale';
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import OrdinalScale from '../../scale/Ordinal';
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import Polar from './Polar';
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import { AngleAxisModel } from './AxisModel';
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const inner = makeInner<{
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lastAutoInterval: number
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lastTickCount: number
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}, AngleAxisModel>();
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interface AngleAxis {
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dataToAngle: Axis['dataToCoord']
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angleToData: Axis['coordToData']
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}
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class AngleAxis extends Axis {
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polar: Polar;
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model: AngleAxisModel;
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constructor(scale?: Scale, angleExtent?: [number, number]) {
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super('angle', scale, angleExtent || [0, 360]);
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}
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pointToData(point: number[], clamp?: boolean) {
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return this.polar.pointToData(point, clamp)[this.dim === 'radius' ? 0 : 1];
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}
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/**
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* Only be called in category axis.
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* Angle axis uses text height to decide interval
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*
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* @override
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* @return {number} Auto interval for cateogry axis tick and label
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*/
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calculateCategoryInterval() {
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const axis = this;
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const labelModel = axis.getLabelModel();
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const ordinalScale = axis.scale as OrdinalScale;
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const 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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const 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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const tickValue = ordinalExtent[0];
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const unitSpan = axis.dataToCoord(tickValue + 1) - axis.dataToCoord(tickValue);
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const unitH = Math.abs(unitSpan);
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// Not precise, just use height as text width
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// and each distance from axis line yet.
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const rect = textContain.getBoundingRect(
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tickValue == null ? '' : tickValue + '',
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labelModel.getFont(),
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'center',
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'top'
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);
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const maxH = Math.max(rect.height, 7);
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let dh = maxH / unitH;
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// 0/0 is NaN, 1/0 is Infinity.
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isNaN(dh) && (dh = Infinity);
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let interval = Math.max(0, Math.floor(dh));
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const cache = inner(axis.model);
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const lastAutoInterval = cache.lastAutoInterval;
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const 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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if (lastAutoInterval != null
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&& lastTickCount != null
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&& Math.abs(lastAutoInterval - interval) <= 1
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&& 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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) {
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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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}
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return interval;
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}
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}
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AngleAxis.prototype.dataToAngle = Axis.prototype.dataToCoord;
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AngleAxis.prototype.angleToData = Axis.prototype.coordToData;
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export default AngleAxis;
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