| /* |
| * 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. |
| */ |
| |
| import * as textContain from 'zrender/src/contain/text'; |
| import Axis from '../Axis'; |
| import {makeInner} from '../../util/model'; |
| import Scale from '../../scale/Scale'; |
| import OrdinalScale from '../../scale/Ordinal'; |
| import Polar from './Polar'; |
| import { AngleAxisModel } from './AxisModel'; |
| |
| const inner = makeInner<{ |
| lastAutoInterval: number |
| lastTickCount: number |
| }, AngleAxisModel>(); |
| |
| interface AngleAxis { |
| dataToAngle: Axis['dataToCoord'] |
| angleToData: Axis['coordToData'] |
| } |
| class AngleAxis extends Axis { |
| |
| polar: Polar; |
| |
| model: AngleAxisModel; |
| |
| constructor(scale?: Scale, angleExtent?: [number, number]) { |
| super('angle', scale, angleExtent || [0, 360]); |
| } |
| |
| pointToData(point: number[], clamp?: boolean) { |
| return this.polar.pointToData(point, clamp)[this.dim === 'radius' ? 0 : 1]; |
| } |
| |
| /** |
| * Only be called in category axis. |
| * Angle axis uses text height to decide interval |
| * |
| * @override |
| * @return {number} Auto interval for cateogry axis tick and label |
| */ |
| calculateCategoryInterval() { |
| const axis = this; |
| const labelModel = axis.getLabelModel(); |
| |
| const ordinalScale = axis.scale as OrdinalScale; |
| const ordinalExtent = ordinalScale.getExtent(); |
| // Providing this method is for optimization: |
| // avoid generating a long array by `getTicks` |
| // in large category data case. |
| const tickCount = ordinalScale.count(); |
| |
| if (ordinalExtent[1] - ordinalExtent[0] < 1) { |
| return 0; |
| } |
| |
| const tickValue = ordinalExtent[0]; |
| const unitSpan = axis.dataToCoord(tickValue + 1) - axis.dataToCoord(tickValue); |
| const unitH = Math.abs(unitSpan); |
| |
| // Not precise, just use height as text width |
| // and each distance from axis line yet. |
| const rect = textContain.getBoundingRect( |
| tickValue == null ? '' : tickValue + '', |
| labelModel.getFont(), |
| 'center', |
| 'top' |
| ); |
| const maxH = Math.max(rect.height, 7); |
| |
| let dh = maxH / unitH; |
| // 0/0 is NaN, 1/0 is Infinity. |
| isNaN(dh) && (dh = Infinity); |
| let interval = Math.max(0, Math.floor(dh)); |
| |
| const cache = inner(axis.model); |
| const lastAutoInterval = cache.lastAutoInterval; |
| const lastTickCount = cache.lastTickCount; |
| |
| // Use cache to keep interval stable while moving zoom window, |
| // otherwise the calculated interval might jitter when the zoom |
| // window size is close to the interval-changing size. |
| if (lastAutoInterval != null |
| && lastTickCount != null |
| && Math.abs(lastAutoInterval - interval) <= 1 |
| && Math.abs(lastTickCount - tickCount) <= 1 |
| // Always choose the bigger one, otherwise the critical |
| // point is not the same when zooming in or zooming out. |
| && lastAutoInterval > interval |
| ) { |
| interval = lastAutoInterval; |
| } |
| // Only update cache if cache not used, otherwise the |
| // changing of interval is too insensitive. |
| else { |
| cache.lastTickCount = tickCount; |
| cache.lastAutoInterval = interval; |
| } |
| |
| return interval; |
| } |
| } |
| |
| AngleAxis.prototype.dataToAngle = Axis.prototype.dataToCoord; |
| |
| AngleAxis.prototype.angleToData = Axis.prototype.coordToData; |
| |
| |
| export default AngleAxis; |