echarts AxisBuilder 源码
echarts AxisBuilder 代码
文件路径：/src/component/axis/AxisBuilder.ts
/*
* 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 {retrieve, defaults, extend, each, isObject, map, isString, isNumber, isFunction} from 'zrender/src/core/util';
import * as graphic from '../../util/graphic';
import {getECData} from '../../util/innerStore';
import {createTextStyle} from '../../label/labelStyle';
import Model from '../../model/Model';
import {isRadianAroundZero, remRadian} from '../../util/number';
import {createSymbol, normalizeSymbolOffset} from '../../util/symbol';
import * as matrixUtil from 'zrender/src/core/matrix';
import {applyTransform as v2ApplyTransform} from 'zrender/src/core/vector';
import {shouldShowAllLabels} from '../../coord/axisHelper';
import { AxisBaseModel } from '../../coord/AxisBaseModel';
import { ZRTextVerticalAlign, ZRTextAlign, ECElement, ColorString } from '../../util/types';
import { AxisBaseOption } from '../../coord/axisCommonTypes';
import Element from 'zrender/src/Element';
import { PathStyleProps } from 'zrender/src/graphic/Path';
import OrdinalScale from '../../scale/Ordinal';
import { prepareLayoutList, hideOverlap } from '../../label/labelLayoutHelper';
const PI = Math.PI;
type AxisIndexKey = 'xAxisIndex' | 'yAxisIndex' | 'radiusAxisIndex'
| 'angleAxisIndex' | 'singleAxisIndex';
type AxisEventData = {
componentType: string
componentIndex: number
targetType: 'axisName' | 'axisLabel'
name?: string
value?: string | number
dataIndex?: number
tickIndex?: number
} & {
[key in AxisIndexKey]?: number
};
type AxisLabelText = graphic.Text & {
__fullText: string
__truncatedText: string
} & ECElement;
export interface AxisBuilderCfg {
position?: number[]
rotation?: number
/**
* Used when nameLocation is 'middle' or 'center'.
* 1 | -1
*/
nameDirection?: number
tickDirection?: number
labelDirection?: number
/**
* Usefull when onZero.
*/
labelOffset?: number
/**
* default get from axisModel.
*/
axisLabelShow?: boolean
/**
* default get from axisModel.
*/
axisName?: string
axisNameAvailableWidth?: number
/**
* by degree, default get from axisModel.
*/
labelRotate?: number
strokeContainThreshold?: number
nameTruncateMaxWidth?: number
silent?: boolean
handleAutoShown?(elementType: 'axisLine' | 'axisTick'): boolean
}
interface TickCoord {
coord: number
tickValue?: number
}
/**
* A final axis is translated and rotated from a "standard axis".
* So opt.position and opt.rotation is required.
*
* A standard axis is and axis from [0, 0] to [0, axisExtent[1]],
* for example: (0, 0) ------------> (0, 50)
*
* nameDirection or tickDirection or labelDirection is 1 means tick
* or label is below the standard axis, whereas is -1 means above
* the standard axis. labelOffset means offset between label and axis,
* which is useful when 'onZero', where axisLabel is in the grid and
* label in outside grid.
*
* Tips: like always,
* positive rotation represents anticlockwise, and negative rotation
* represents clockwise.
* The direction of position coordinate is the same as the direction
* of screen coordinate.
*
* Do not need to consider axis 'inverse', which is auto processed by
* axis extent.
*/
class AxisBuilder {
axisModel: AxisBaseModel;
opt: AxisBuilderCfg;
readonly group = new graphic.Group();
private _transformGroup: graphic.Group;
constructor(axisModel: AxisBaseModel, opt?: AxisBuilderCfg) {
this.opt = opt;
this.axisModel = axisModel;
// Default value
defaults(
opt,
{
labelOffset: 0,
nameDirection: 1,
tickDirection: 1,
labelDirection: 1,
silent: true,
handleAutoShown: () => true
} as AxisBuilderCfg
);
// FIXME Not use a seperate text group?
const transformGroup = new graphic.Group({
x: opt.position[0],
y: opt.position[1],
rotation: opt.rotation
});
// this.group.add(transformGroup);
// this._transformGroup = transformGroup;
transformGroup.updateTransform();
this._transformGroup = transformGroup;
}
hasBuilder(name: keyof typeof builders) {
return !!builders[name];
}
add(name: keyof typeof builders) {
builders[name](this.opt, this.axisModel, this.group, this._transformGroup);
}
getGroup() {
return this.group;
}
static innerTextLayout(axisRotation: number, textRotation: number, direction: number) {
const rotationDiff = remRadian(textRotation - axisRotation);
let textAlign;
let textVerticalAlign;
if (isRadianAroundZero(rotationDiff)) { // Label is parallel with axis line.
textVerticalAlign = direction > 0 ? 'top' : 'bottom';
textAlign = 'center';
}
else if (isRadianAroundZero(rotationDiff - PI)) { // Label is inverse parallel with axis line.
textVerticalAlign = direction > 0 ? 'bottom' : 'top';
textAlign = 'center';
}
else {
textVerticalAlign = 'middle';
if (rotationDiff > 0 && rotationDiff < PI) {
textAlign = direction > 0 ? 'right' : 'left';
}
else {
textAlign = direction > 0 ? 'left' : 'right';
}
}
return {
rotation: rotationDiff,
textAlign: textAlign as ZRTextAlign,
textVerticalAlign: textVerticalAlign as ZRTextVerticalAlign
};
}
static makeAxisEventDataBase(axisModel: AxisBaseModel) {
const eventData = {
componentType: axisModel.mainType,
componentIndex: axisModel.componentIndex
} as AxisEventData;
eventData[axisModel.mainType + 'Index' as AxisIndexKey] = axisModel.componentIndex;
return eventData;
}
static isLabelSilent(axisModel: AxisBaseModel): boolean {
const tooltipOpt = axisModel.get('tooltip');
return axisModel.get('silent')
// Consider mouse cursor, add these restrictions.
|| !(
axisModel.get('triggerEvent') || (tooltipOpt && tooltipOpt.show)
);
}
};
interface AxisElementsBuilder {
(
opt: AxisBuilderCfg,
axisModel: AxisBaseModel,
group: graphic.Group,
transformGroup: graphic.Group
):void
}
const builders: Record<'axisLine' | 'axisTickLabel' | 'axisName', AxisElementsBuilder> = {
axisLine(opt, axisModel, group, transformGroup) {
let shown = axisModel.get(['axisLine', 'show']);
if (shown === 'auto' && opt.handleAutoShown) {
shown = opt.handleAutoShown('axisLine');
}
if (!shown) {
return;
}
const extent = axisModel.axis.getExtent();
const matrix = transformGroup.transform;
const pt1 = [extent[0], 0];
const pt2 = [extent[1], 0];
const inverse = pt1[0] > pt2[0];
if (matrix) {
v2ApplyTransform(pt1, pt1, matrix);
v2ApplyTransform(pt2, pt2, matrix);
}
const lineStyle = extend(
{
lineCap: 'round'
},
axisModel.getModel(['axisLine', 'lineStyle']).getLineStyle()
);
const line = new graphic.Line({
shape: {
x1: pt1[0],
y1: pt1[1],
x2: pt2[0],
y2: pt2[1]
},
style: lineStyle,
strokeContainThreshold: opt.strokeContainThreshold || 5,
silent: true,
z2: 1
});
graphic.subPixelOptimizeLine(line.shape, line.style.lineWidth);
line.anid = 'line';
group.add(line);
let arrows = axisModel.get(['axisLine', 'symbol']);
if (arrows != null) {
let arrowSize = axisModel.get(['axisLine', 'symbolSize']);
if (isString(arrows)) {
// Use the same arrow for start and end point
arrows = [arrows, arrows];
}
if (isString(arrowSize) || isNumber(arrowSize)) {
// Use the same size for width and height
arrowSize = [arrowSize as number, arrowSize as number];
}
const arrowOffset = normalizeSymbolOffset(axisModel.get(['axisLine', 'symbolOffset']) || 0, arrowSize);
const symbolWidth = arrowSize[0];
const symbolHeight = arrowSize[1];
each([{
rotate: opt.rotation + Math.PI / 2,
offset: arrowOffset[0],
r: 0
}, {
rotate: opt.rotation - Math.PI / 2,
offset: arrowOffset[1],
r: Math.sqrt((pt1[0] - pt2[0]) * (pt1[0] - pt2[0])
+ (pt1[1] - pt2[1]) * (pt1[1] - pt2[1]))
}], function (point, index) {
if (arrows[index] !== 'none' && arrows[index] != null) {
const symbol = createSymbol(
arrows[index],
-symbolWidth / 2,
-symbolHeight / 2,
symbolWidth,
symbolHeight,
lineStyle.stroke,
true
);
// Calculate arrow position with offset
const r = point.r + point.offset;
const pt = inverse ? pt2 : pt1;
symbol.attr({
rotation: point.rotate,
x: pt[0] + r * Math.cos(opt.rotation),
y: pt[1] - r * Math.sin(opt.rotation),
silent: true,
z2: 11
});
group.add(symbol);
}
});
}
},
axisTickLabel(opt, axisModel, group, transformGroup) {
const ticksEls = buildAxisMajorTicks(group, transformGroup, axisModel, opt);
const labelEls = buildAxisLabel(group, transformGroup, axisModel, opt);
fixMinMaxLabelShow(axisModel, labelEls, ticksEls);
buildAxisMinorTicks(group, transformGroup, axisModel, opt.tickDirection);
// This bit fixes the label overlap issue for the time chart.
// See https://github.com/apache/echarts/issues/14266 for more.
if (axisModel.get(['axisLabel', 'hideOverlap'])) {
const labelList = prepareLayoutList(map(labelEls, label => ({
label,
priority: label.z2,
defaultAttr: {
ignore: label.ignore
}
})));
hideOverlap(labelList);
}
},
axisName(opt, axisModel, group, transformGroup) {
const name = retrieve(opt.axisName, axisModel.get('name'));
if (!name) {
return;
}
const nameLocation = axisModel.get('nameLocation');
const nameDirection = opt.nameDirection;
const textStyleModel = axisModel.getModel('nameTextStyle');
const gap = axisModel.get('nameGap') || 0;
const extent = axisModel.axis.getExtent();
const gapSignal = extent[0] > extent[1] ? -1 : 1;
const pos = [
nameLocation === 'start'
? extent[0] - gapSignal * gap
: nameLocation === 'end'
? extent[1] + gapSignal * gap
: (extent[0] + extent[1]) / 2, // 'middle'
// Reuse labelOffset.
isNameLocationCenter(nameLocation) ? opt.labelOffset + nameDirection * gap : 0
];
let labelLayout;
let nameRotation = axisModel.get('nameRotate');
if (nameRotation != null) {
nameRotation = nameRotation * PI / 180; // To radian.
}
let axisNameAvailableWidth;
if (isNameLocationCenter(nameLocation)) {
labelLayout = AxisBuilder.innerTextLayout(
opt.rotation,
nameRotation != null ? nameRotation : opt.rotation, // Adapt to axis.
nameDirection
);
}
else {
labelLayout = endTextLayout(
opt.rotation, nameLocation, nameRotation || 0, extent
);
axisNameAvailableWidth = opt.axisNameAvailableWidth;
if (axisNameAvailableWidth != null) {
axisNameAvailableWidth = Math.abs(
axisNameAvailableWidth / Math.sin(labelLayout.rotation)
);
!isFinite(axisNameAvailableWidth) && (axisNameAvailableWidth = null);
}
}
const textFont = textStyleModel.getFont();
const truncateOpt = axisModel.get('nameTruncate', true) || {};
const ellipsis = truncateOpt.ellipsis;
const maxWidth = retrieve(
opt.nameTruncateMaxWidth, truncateOpt.maxWidth, axisNameAvailableWidth
);
const textEl = new graphic.Text({
x: pos[0],
y: pos[1],
rotation: labelLayout.rotation,
silent: AxisBuilder.isLabelSilent(axisModel),
style: createTextStyle(textStyleModel, {
text: name,
font: textFont,
overflow: 'truncate',
width: maxWidth,
ellipsis,
fill: textStyleModel.getTextColor()
|| axisModel.get(['axisLine', 'lineStyle', 'color']) as ColorString,
align: textStyleModel.get('align')
|| labelLayout.textAlign,
verticalAlign: textStyleModel.get('verticalAlign')
|| labelLayout.textVerticalAlign
}),
z2: 1
}) as AxisLabelText;
graphic.setTooltipConfig({
el: textEl,
componentModel: axisModel,
itemName: name
});
textEl.__fullText = name;
// Id for animation
textEl.anid = 'name';
if (axisModel.get('triggerEvent')) {
const eventData = AxisBuilder.makeAxisEventDataBase(axisModel);
eventData.targetType = 'axisName';
eventData.name = name;
getECData(textEl).eventData = eventData;
}
// FIXME
transformGroup.add(textEl);
textEl.updateTransform();
group.add(textEl);
textEl.decomposeTransform();
}
};
function endTextLayout(
rotation: number, textPosition: 'start' | 'middle' | 'end', textRotate: number, extent: number[]
) {
const rotationDiff = remRadian(textRotate - rotation);
let textAlign: ZRTextAlign;
let textVerticalAlign: ZRTextVerticalAlign;
const inverse = extent[0] > extent[1];
const onLeft = (textPosition === 'start' && !inverse)
|| (textPosition !== 'start' && inverse);
if (isRadianAroundZero(rotationDiff - PI / 2)) {
textVerticalAlign = onLeft ? 'bottom' : 'top';
textAlign = 'center';
}
else if (isRadianAroundZero(rotationDiff - PI * 1.5)) {
textVerticalAlign = onLeft ? 'top' : 'bottom';
textAlign = 'center';
}
else {
textVerticalAlign = 'middle';
if (rotationDiff < PI * 1.5 && rotationDiff > PI / 2) {
textAlign = onLeft ? 'left' : 'right';
}
else {
textAlign = onLeft ? 'right' : 'left';
}
}
return {
rotation: rotationDiff,
textAlign: textAlign,
textVerticalAlign: textVerticalAlign
};
}
function fixMinMaxLabelShow(
axisModel: AxisBaseModel,
labelEls: graphic.Text[],
tickEls: graphic.Line[]
) {
if (shouldShowAllLabels(axisModel.axis)) {
return;
}
// If min or max are user set, we need to check
// If the tick on min(max) are overlap on their neighbour tick
// If they are overlapped, we need to hide the min(max) tick label
const showMinLabel = axisModel.get(['axisLabel', 'showMinLabel']);
const showMaxLabel = axisModel.get(['axisLabel', 'showMaxLabel']);
// FIXME
// Have not consider onBand yet, where tick els is more than label els.
labelEls = labelEls || [];
tickEls = tickEls || [];
const firstLabel = labelEls[0];
const nextLabel = labelEls[1];
const lastLabel = labelEls[labelEls.length - 1];
const prevLabel = labelEls[labelEls.length - 2];
const firstTick = tickEls[0];
const nextTick = tickEls[1];
const lastTick = tickEls[tickEls.length - 1];
const prevTick = tickEls[tickEls.length - 2];
if (showMinLabel === false) {
ignoreEl(firstLabel);
ignoreEl(firstTick);
}
else if (isTwoLabelOverlapped(firstLabel, nextLabel)) {
if (showMinLabel) {
ignoreEl(nextLabel);
ignoreEl(nextTick);
}
else {
ignoreEl(firstLabel);
ignoreEl(firstTick);
}
}
if (showMaxLabel === false) {
ignoreEl(lastLabel);
ignoreEl(lastTick);
}
else if (isTwoLabelOverlapped(prevLabel, lastLabel)) {
if (showMaxLabel) {
ignoreEl(prevLabel);
ignoreEl(prevTick);
}
else {
ignoreEl(lastLabel);
ignoreEl(lastTick);
}
}
}
function ignoreEl(el: Element) {
el && (el.ignore = true);
}
function isTwoLabelOverlapped(
current: graphic.Text,
next: graphic.Text
) {
// current and next has the same rotation.
const firstRect = current && current.getBoundingRect().clone();
const nextRect = next && next.getBoundingRect().clone();
if (!firstRect || !nextRect) {
return;
}
// When checking intersect of two rotated labels, we use mRotationBack
// to avoid that boundingRect is enlarge when using `boundingRect.applyTransform`.
const mRotationBack = matrixUtil.identity([]);
matrixUtil.rotate(mRotationBack, mRotationBack, -current.rotation);
firstRect.applyTransform(matrixUtil.mul([], mRotationBack, current.getLocalTransform()));
nextRect.applyTransform(matrixUtil.mul([], mRotationBack, next.getLocalTransform()));
return firstRect.intersect(nextRect);
}
function isNameLocationCenter(nameLocation: string) {
return nameLocation === 'middle' || nameLocation === 'center';
}
function createTicks(
ticksCoords: TickCoord[],
tickTransform: matrixUtil.MatrixArray,
tickEndCoord: number,
tickLineStyle: PathStyleProps,
anidPrefix: string
) {
const tickEls = [];
const pt1: number[] = [];
const pt2: number[] = [];
for (let i = 0; i < ticksCoords.length; i++) {
const tickCoord = ticksCoords[i].coord;
pt1[0] = tickCoord;
pt1[1] = 0;
pt2[0] = tickCoord;
pt2[1] = tickEndCoord;
if (tickTransform) {
v2ApplyTransform(pt1, pt1, tickTransform);
v2ApplyTransform(pt2, pt2, tickTransform);
}
// Tick line, Not use group transform to have better line draw
const tickEl = new graphic.Line({
shape: {
x1: pt1[0],
y1: pt1[1],
x2: pt2[0],
y2: pt2[1]
},
style: tickLineStyle,
z2: 2,
autoBatch: true,
silent: true
});
graphic.subPixelOptimizeLine(tickEl.shape, tickEl.style.lineWidth);
tickEl.anid = anidPrefix + '_' + ticksCoords[i].tickValue;
tickEls.push(tickEl);
}
return tickEls;
}
function buildAxisMajorTicks(
group: graphic.Group,
transformGroup: graphic.Group,
axisModel: AxisBaseModel,
opt: AxisBuilderCfg
) {
const axis = axisModel.axis;
const tickModel = axisModel.getModel('axisTick');
let shown = tickModel.get('show');
if (shown === 'auto' && opt.handleAutoShown) {
shown = opt.handleAutoShown('axisTick');
}
if (!shown || axis.scale.isBlank()) {
return;
}
const lineStyleModel = tickModel.getModel('lineStyle');
const tickEndCoord = opt.tickDirection * tickModel.get('length');
const ticksCoords = axis.getTicksCoords();
const ticksEls = createTicks(ticksCoords, transformGroup.transform, tickEndCoord, defaults(
lineStyleModel.getLineStyle(),
{
stroke: axisModel.get(['axisLine', 'lineStyle', 'color'])
}
), 'ticks');
for (let i = 0; i < ticksEls.length; i++) {
group.add(ticksEls[i]);
}
return ticksEls;
}
function buildAxisMinorTicks(
group: graphic.Group,
transformGroup: graphic.Group,
axisModel: AxisBaseModel,
tickDirection: number
) {
const axis = axisModel.axis;
const minorTickModel = axisModel.getModel('minorTick');
if (!minorTickModel.get('show') || axis.scale.isBlank()) {
return;
}
const minorTicksCoords = axis.getMinorTicksCoords();
if (!minorTicksCoords.length) {
return;
}
const lineStyleModel = minorTickModel.getModel('lineStyle');
const tickEndCoord = tickDirection * minorTickModel.get('length');
const minorTickLineStyle = defaults(
lineStyleModel.getLineStyle(),
defaults(
axisModel.getModel('axisTick').getLineStyle(),
{
stroke: axisModel.get(['axisLine', 'lineStyle', 'color'])
}
)
);
for (let i = 0; i < minorTicksCoords.length; i++) {
const minorTicksEls = createTicks(
minorTicksCoords[i], transformGroup.transform, tickEndCoord, minorTickLineStyle, 'minorticks_' + i
);
for (let k = 0; k < minorTicksEls.length; k++) {
group.add(minorTicksEls[k]);
}
}
}
function buildAxisLabel(
group: graphic.Group,
transformGroup: graphic.Group,
axisModel: AxisBaseModel,
opt: AxisBuilderCfg
) {
const axis = axisModel.axis;
const show = retrieve(opt.axisLabelShow, axisModel.get(['axisLabel', 'show']));
if (!show || axis.scale.isBlank()) {
return;
}
const labelModel = axisModel.getModel('axisLabel');
const labelMargin = labelModel.get('margin');
const labels = axis.getViewLabels();
// Special label rotate.
const labelRotation = (
retrieve(opt.labelRotate, labelModel.get('rotate')) || 0
) * PI / 180;
const labelLayout = AxisBuilder.innerTextLayout(opt.rotation, labelRotation, opt.labelDirection);
const rawCategoryData = axisModel.getCategories && axisModel.getCategories(true);
const labelEls: graphic.Text[] = [];
const silent = AxisBuilder.isLabelSilent(axisModel);
const triggerEvent = axisModel.get('triggerEvent');
each(labels, function (labelItem, index) {
const tickValue = axis.scale.type === 'ordinal'
? (axis.scale as OrdinalScale).getRawOrdinalNumber(labelItem.tickValue)
: labelItem.tickValue;
const formattedLabel = labelItem.formattedLabel;
const rawLabel = labelItem.rawLabel;
let itemLabelModel = labelModel;
if (rawCategoryData && rawCategoryData[tickValue]) {
const rawCategoryItem = rawCategoryData[tickValue];
if (isObject(rawCategoryItem) && rawCategoryItem.textStyle) {
itemLabelModel = new Model(
rawCategoryItem.textStyle, labelModel, axisModel.ecModel
);
}
}
const textColor = itemLabelModel.getTextColor() as AxisBaseOption['axisLabel']['color']
|| axisModel.get(['axisLine', 'lineStyle', 'color']);
const tickCoord = axis.dataToCoord(tickValue);
const textEl = new graphic.Text({
x: tickCoord,
y: opt.labelOffset + opt.labelDirection * labelMargin,
rotation: labelLayout.rotation,
silent: silent,
z2: 10 + (labelItem.level || 0),
style: createTextStyle(itemLabelModel, {
text: formattedLabel,
align: itemLabelModel.getShallow('align', true)
|| labelLayout.textAlign,
verticalAlign: itemLabelModel.getShallow('verticalAlign', true)
|| itemLabelModel.getShallow('baseline', true)
|| labelLayout.textVerticalAlign,
fill: isFunction(textColor)
? textColor(
// (1) In category axis with data zoom, tick is not the original
// index of axis.data. So tick should not be exposed to user
// in category axis.
// (2) Compatible with previous version, which always use formatted label as
// input. But in interval scale the formatted label is like '223,445', which
// maked user repalce ','. So we modify it to return original val but remain
// it as 'string' to avoid error in replacing.
axis.type === 'category'
? rawLabel
: axis.type === 'value'
? tickValue + ''
: tickValue,
index
)
: textColor as string
})
});
textEl.anid = 'label_' + tickValue;
// Pack data for mouse event
if (triggerEvent) {
const eventData = AxisBuilder.makeAxisEventDataBase(axisModel);
eventData.targetType = 'axisLabel';
eventData.value = rawLabel;
eventData.tickIndex = index;
if (axis.type === 'category') {
eventData.dataIndex = tickValue;
}
getECData(textEl).eventData = eventData;
}
// FIXME
transformGroup.add(textEl);
textEl.updateTransform();
labelEls.push(textEl);
group.add(textEl);
textEl.decomposeTransform();
});
return labelEls;
}
export default AxisBuilder;
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