echarts treemapLayout 源码
echarts treemapLayout 代码
文件路径：/src/chart/treemap/treemapLayout.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.
*/
/*
* A third-party license is embeded for some of the code in this file:
* The treemap layout implementation was originally copied from
* "d3.js" with some modifications made for this project.
* (See more details in the comment of the method "squarify" below.)
* The use of the source code of this file is also subject to the terms
* and consitions of the license of "d3.js" (BSD-3Clause, see
* </licenses/LICENSE-d3>).
*/
import * as zrUtil from 'zrender/src/core/util';
import BoundingRect, { RectLike } from 'zrender/src/core/BoundingRect';
import {parsePercent, MAX_SAFE_INTEGER} from '../../util/number';
import * as layout from '../../util/layout';
import * as helper from '../helper/treeHelper';
import TreemapSeriesModel, { TreemapSeriesNodeItemOption } from './TreemapSeries';
import GlobalModel from '../../model/Global';
import ExtensionAPI from '../../core/ExtensionAPI';
import { TreeNode } from '../../data/Tree';
import Model from '../../model/Model';
import { TreemapRenderPayload, TreemapMovePayload, TreemapZoomToNodePayload } from './treemapAction';
const mathMax = Math.max;
const mathMin = Math.min;
const retrieveValue = zrUtil.retrieve;
const each = zrUtil.each;
const PATH_BORDER_WIDTH = ['itemStyle', 'borderWidth'] as const;
const PATH_GAP_WIDTH = ['itemStyle', 'gapWidth'] as const;
const PATH_UPPER_LABEL_SHOW = ['upperLabel', 'show'] as const;
const PATH_UPPER_LABEL_HEIGHT = ['upperLabel', 'height'] as const;
export interface TreemapLayoutNode extends TreeNode {
parentNode: TreemapLayoutNode
children: TreemapLayoutNode[]
viewChildren: TreemapLayoutNode[]
}
export interface TreemapItemLayout extends RectLike {
area: number
isLeafRoot: boolean
dataExtent: [number, number]
borderWidth: number
upperHeight: number
upperLabelHeight: number
isInView: boolean
invisible: boolean
isAboveViewRoot: boolean
};
type NodeModel = Model<TreemapSeriesNodeItemOption>;
type OrderBy = 'asc' | 'desc' | boolean;
type LayoutRow = TreemapLayoutNode[] & {
area: number
};
/**
* @public
*/
export default {
seriesType: 'treemap',
reset: function (
seriesModel: TreemapSeriesModel,
ecModel: GlobalModel,
api: ExtensionAPI,
payload?: TreemapZoomToNodePayload | TreemapRenderPayload | TreemapMovePayload
) {
// Layout result in each node:
// {x, y, width, height, area, borderWidth}
const ecWidth = api.getWidth();
const ecHeight = api.getHeight();
const seriesOption = seriesModel.option;
const layoutInfo = layout.getLayoutRect(
seriesModel.getBoxLayoutParams(),
{
width: api.getWidth(),
height: api.getHeight()
}
);
const size = seriesOption.size || []; // Compatible with ec2.
const containerWidth = parsePercent(
retrieveValue(layoutInfo.width, size[0]),
ecWidth
);
const containerHeight = parsePercent(
retrieveValue(layoutInfo.height, size[1]),
ecHeight
);
// Fetch payload info.
const payloadType = payload && payload.type;
const types = ['treemapZoomToNode', 'treemapRootToNode'];
const targetInfo = helper
.retrieveTargetInfo(payload, types, seriesModel);
const rootRect = (payloadType === 'treemapRender' || payloadType === 'treemapMove')
? payload.rootRect : null;
const viewRoot = seriesModel.getViewRoot();
const viewAbovePath = helper.getPathToRoot(viewRoot) as TreemapLayoutNode[];
if (payloadType !== 'treemapMove') {
const rootSize = payloadType === 'treemapZoomToNode'
? estimateRootSize(
seriesModel, targetInfo, viewRoot, containerWidth, containerHeight
)
: rootRect
? [rootRect.width, rootRect.height]
: [containerWidth, containerHeight];
let sort = seriesOption.sort;
if (sort && sort !== 'asc' && sort !== 'desc') {
// Default to be desc order.
sort = 'desc';
}
const options = {
squareRatio: seriesOption.squareRatio,
sort: sort,
leafDepth: seriesOption.leafDepth
};
// layout should be cleared because using updateView but not update.
viewRoot.hostTree.clearLayouts();
// TODO
// optimize: if out of view clip, do not layout.
// But take care that if do not render node out of view clip,
// how to calculate start po
let viewRootLayout = {
x: 0,
y: 0,
width: rootSize[0],
height: rootSize[1],
area: rootSize[0] * rootSize[1]
};
viewRoot.setLayout(viewRootLayout);
squarify(viewRoot, options, false, 0);
// Supplement layout.
viewRootLayout = viewRoot.getLayout();
each(viewAbovePath, function (node, index) {
const childValue = (viewAbovePath[index + 1] || viewRoot).getValue();
node.setLayout(zrUtil.extend(
{
dataExtent: [childValue, childValue],
borderWidth: 0,
upperHeight: 0
},
viewRootLayout
));
});
}
const treeRoot = seriesModel.getData().tree.root;
treeRoot.setLayout(
calculateRootPosition(layoutInfo, rootRect, targetInfo),
true
);
seriesModel.setLayoutInfo(layoutInfo);
// FIXME
// 现在没有clip功能，暂时取ec高宽。
prunning(
treeRoot,
// Transform to base element coordinate system.
new BoundingRect(-layoutInfo.x, -layoutInfo.y, ecWidth, ecHeight),
viewAbovePath,
viewRoot,
0
);
}
};
/**
* Layout treemap with squarify algorithm.
* The original presentation of this algorithm
* was made by Mark Bruls, Kees Huizing, and Jarke J. van Wijk
* <https://graphics.ethz.ch/teaching/scivis_common/Literature/squarifiedTreeMaps.pdf>.
* The implementation of this algorithm was originally copied from "d3.js"
* <https://github.com/d3/d3/blob/9cc9a875e636a1dcf36cc1e07bdf77e1ad6e2c74/src/layout/treemap.js>
* with some modifications made for this program.
* See the license statement at the head of this file.
*
* @protected
* @param {module:echarts/data/Tree~TreeNode} node
* @param {Object} options
* @param {string} options.sort 'asc' or 'desc'
* @param {number} options.squareRatio
* @param {boolean} hideChildren
* @param {number} depth
*/
function squarify(
node: TreemapLayoutNode,
options: {
sort?: OrderBy
squareRatio?: number
leafDepth?: number
},
hideChildren: boolean,
depth: number
) {
let width;
let height;
if (node.isRemoved()) {
return;
}
const thisLayout = node.getLayout();
width = thisLayout.width;
height = thisLayout.height;
// Considering border and gap
const nodeModel = node.getModel<TreemapSeriesNodeItemOption>();
const borderWidth = nodeModel.get(PATH_BORDER_WIDTH);
const halfGapWidth = nodeModel.get(PATH_GAP_WIDTH) / 2;
const upperLabelHeight = getUpperLabelHeight(nodeModel);
const upperHeight = Math.max(borderWidth, upperLabelHeight);
const layoutOffset = borderWidth - halfGapWidth;
const layoutOffsetUpper = upperHeight - halfGapWidth;
node.setLayout({
borderWidth: borderWidth,
upperHeight: upperHeight,
upperLabelHeight: upperLabelHeight
}, true);
width = mathMax(width - 2 * layoutOffset, 0);
height = mathMax(height - layoutOffset - layoutOffsetUpper, 0);
const totalArea = width * height;
const viewChildren = initChildren(
node, nodeModel, totalArea, options, hideChildren, depth
);
if (!viewChildren.length) {
return;
}
const rect = {x: layoutOffset, y: layoutOffsetUpper, width: width, height: height};
let rowFixedLength = mathMin(width, height);
let best = Infinity; // the best row score so far
const row = [] as LayoutRow;
row.area = 0;
for (let i = 0, len = viewChildren.length; i < len;) {
const child = viewChildren[i];
row.push(child);
row.area += child.getLayout().area;
const score = worst(row, rowFixedLength, options.squareRatio);
// continue with this orientation
if (score <= best) {
i++;
best = score;
}
// abort, and try a different orientation
else {
row.area -= row.pop().getLayout().area;
position(row, rowFixedLength, rect, halfGapWidth, false);
rowFixedLength = mathMin(rect.width, rect.height);
row.length = row.area = 0;
best = Infinity;
}
}
if (row.length) {
position(row, rowFixedLength, rect, halfGapWidth, true);
}
if (!hideChildren) {
const childrenVisibleMin = nodeModel.get('childrenVisibleMin');
if (childrenVisibleMin != null && totalArea < childrenVisibleMin) {
hideChildren = true;
}
}
for (let i = 0, len = viewChildren.length; i < len; i++) {
squarify(viewChildren[i], options, hideChildren, depth + 1);
}
}
/**
* Set area to each child, and calculate data extent for visual coding.
*/
function initChildren(
node: TreemapLayoutNode,
nodeModel: NodeModel,
totalArea: number,
options: {
sort?: OrderBy
leafDepth?: number
},
hideChildren: boolean,
depth: number
) {
let viewChildren = node.children || [];
let orderBy = options.sort;
orderBy !== 'asc' && orderBy !== 'desc' && (orderBy = null);
const overLeafDepth = options.leafDepth != null && options.leafDepth <= depth;
// leafDepth has higher priority.
if (hideChildren && !overLeafDepth) {
return (node.viewChildren = []);
}
// Sort children, order by desc.
viewChildren = zrUtil.filter(viewChildren, function (child) {
return !child.isRemoved();
});
sort(viewChildren, orderBy);
const info = statistic(nodeModel, viewChildren, orderBy);
if (info.sum === 0) {
return (node.viewChildren = []);
}
info.sum = filterByThreshold(nodeModel, totalArea, info.sum, orderBy, viewChildren);
if (info.sum === 0) {
return (node.viewChildren = []);
}
// Set area to each child.
for (let i = 0, len = viewChildren.length; i < len; i++) {
const area = viewChildren[i].getValue() as number / info.sum * totalArea;
// Do not use setLayout({...}, true), because it is needed to clear last layout.
viewChildren[i].setLayout({
area: area
});
}
if (overLeafDepth) {
viewChildren.length && node.setLayout({
isLeafRoot: true
}, true);
viewChildren.length = 0;
}
node.viewChildren = viewChildren;
node.setLayout({
dataExtent: info.dataExtent
}, true);
return viewChildren;
}
/**
* Consider 'visibleMin'. Modify viewChildren and get new sum.
*/
function filterByThreshold(
nodeModel: NodeModel,
totalArea: number,
sum: number,
orderBy: OrderBy,
orderedChildren: TreemapLayoutNode[]
) {
// visibleMin is not supported yet when no option.sort.
if (!orderBy) {
return sum;
}
const visibleMin = nodeModel.get('visibleMin');
const len = orderedChildren.length;
let deletePoint = len;
// Always travel from little value to big value.
for (let i = len - 1; i >= 0; i--) {
const value = orderedChildren[
orderBy === 'asc' ? len - i - 1 : i
].getValue() as number;
if (value / sum * totalArea < visibleMin) {
deletePoint = i;
sum -= value;
}
}
orderBy === 'asc'
? orderedChildren.splice(0, len - deletePoint)
: orderedChildren.splice(deletePoint, len - deletePoint);
return sum;
}
/**
* Sort
*/
function sort(
viewChildren: TreemapLayoutNode[],
orderBy: OrderBy
) {
if (orderBy) {
viewChildren.sort(function (a, b) {
const diff = orderBy === 'asc'
? a.getValue() as number - (b.getValue() as number)
: b.getValue() as number - (a.getValue() as number);
return diff === 0
? (orderBy === 'asc'
? a.dataIndex - b.dataIndex : b.dataIndex - a.dataIndex
)
: diff;
});
}
return viewChildren;
}
/**
* Statistic
*/
function statistic(
nodeModel: NodeModel,
children: TreemapLayoutNode[],
orderBy: OrderBy
) {
// Calculate sum.
let sum = 0;
for (let i = 0, len = children.length; i < len; i++) {
sum += children[i].getValue() as number;
}
// Statistic data extent for latter visual coding.
// Notice: data extent should be calculate based on raw children
// but not filtered view children, otherwise visual mapping will not
// be stable when zoom (where children is filtered by visibleMin).
const dimension = nodeModel.get('visualDimension');
let dataExtent: number[];
// The same as area dimension.
if (!children || !children.length) {
dataExtent = [NaN, NaN];
}
else if (dimension === 'value' && orderBy) {
dataExtent = [
children[children.length - 1].getValue() as number,
children[0].getValue() as number
];
orderBy === 'asc' && dataExtent.reverse();
}
// Other dimension.
else {
dataExtent = [Infinity, -Infinity];
each(children, function (child) {
const value = child.getValue(dimension) as number;
value < dataExtent[0] && (dataExtent[0] = value);
value > dataExtent[1] && (dataExtent[1] = value);
});
}
return {sum: sum, dataExtent: dataExtent};
}
/**
* Computes the score for the specified row,
* as the worst aspect ratio.
*/
function worst(row: LayoutRow, rowFixedLength: number, ratio: number) {
let areaMax = 0;
let areaMin = Infinity;
for (let i = 0, area, len = row.length; i < len; i++) {
area = row[i].getLayout().area;
if (area) {
area < areaMin && (areaMin = area);
area > areaMax && (areaMax = area);
}
}
const squareArea = row.area * row.area;
const f = rowFixedLength * rowFixedLength * ratio;
return squareArea
? mathMax(
(f * areaMax) / squareArea,
squareArea / (f * areaMin)
)
: Infinity;
}
/**
* Positions the specified row of nodes. Modifies `rect`.
*/
function position(
row: LayoutRow,
rowFixedLength: number,
rect: RectLike,
halfGapWidth: number,
flush?: boolean
) {
// When rowFixedLength === rect.width,
// it is horizontal subdivision,
// rowFixedLength is the width of the subdivision,
// rowOtherLength is the height of the subdivision,
// and nodes will be positioned from left to right.
// wh[idx0WhenH] means: when horizontal,
// wh[idx0WhenH] => wh[0] => 'width'.
// xy[idx1WhenH] => xy[1] => 'y'.
const idx0WhenH = rowFixedLength === rect.width ? 0 : 1;
const idx1WhenH = 1 - idx0WhenH;
const xy = ['x', 'y'] as const;
const wh = ['width', 'height'] as const;
let last = rect[xy[idx0WhenH]];
let rowOtherLength = rowFixedLength
? row.area / rowFixedLength : 0;
if (flush || rowOtherLength > rect[wh[idx1WhenH]]) {
rowOtherLength = rect[wh[idx1WhenH]]; // over+underflow
}
for (let i = 0, rowLen = row.length; i < rowLen; i++) {
const node = row[i];
const nodeLayout = {} as TreemapItemLayout;
const step = rowOtherLength
? node.getLayout().area / rowOtherLength : 0;
const wh1 = nodeLayout[wh[idx1WhenH]] = mathMax(rowOtherLength - 2 * halfGapWidth, 0);
// We use Math.max/min to avoid negative width/height when considering gap width.
const remain = rect[xy[idx0WhenH]] + rect[wh[idx0WhenH]] - last;
const modWH = (i === rowLen - 1 || remain < step) ? remain : step;
const wh0 = nodeLayout[wh[idx0WhenH]] = mathMax(modWH - 2 * halfGapWidth, 0);
nodeLayout[xy[idx1WhenH]] = rect[xy[idx1WhenH]] + mathMin(halfGapWidth, wh1 / 2);
nodeLayout[xy[idx0WhenH]] = last + mathMin(halfGapWidth, wh0 / 2);
last += modWH;
node.setLayout(nodeLayout, true);
}
rect[xy[idx1WhenH]] += rowOtherLength;
rect[wh[idx1WhenH]] -= rowOtherLength;
}
// Return [containerWidth, containerHeight] as default.
function estimateRootSize(
seriesModel: TreemapSeriesModel,
targetInfo: { node: TreemapLayoutNode },
viewRoot: TreemapLayoutNode,
containerWidth: number,
containerHeight: number
) {
// If targetInfo.node exists, we zoom to the node,
// so estimate whold width and heigth by target node.
let currNode = (targetInfo || {}).node;
const defaultSize = [containerWidth, containerHeight];
if (!currNode || currNode === viewRoot) {
return defaultSize;
}
let parent;
const viewArea = containerWidth * containerHeight;
let area = viewArea * seriesModel.option.zoomToNodeRatio;
while (parent = currNode.parentNode) { // jshint ignore:line
let sum = 0;
const siblings = parent.children;
for (let i = 0, len = siblings.length; i < len; i++) {
sum += siblings[i].getValue() as number;
}
const currNodeValue = currNode.getValue() as number;
if (currNodeValue === 0) {
return defaultSize;
}
area *= sum / currNodeValue;
// Considering border, suppose aspect ratio is 1.
const parentModel = parent.getModel<TreemapSeriesNodeItemOption>();
const borderWidth = parentModel.get(PATH_BORDER_WIDTH);
const upperHeight = Math.max(borderWidth, getUpperLabelHeight(parentModel));
area += 4 * borderWidth * borderWidth
+ (3 * borderWidth + upperHeight) * Math.pow(area, 0.5);
area > MAX_SAFE_INTEGER && (area = MAX_SAFE_INTEGER);
currNode = parent;
}
area < viewArea && (area = viewArea);
const scale = Math.pow(area / viewArea, 0.5);
return [containerWidth * scale, containerHeight * scale];
}
// Root postion base on coord of containerGroup
function calculateRootPosition(
layoutInfo: layout.LayoutRect,
rootRect: RectLike,
targetInfo: { node: TreemapLayoutNode }
) {
if (rootRect) {
return {x: rootRect.x, y: rootRect.y};
}
const defaultPosition = {x: 0, y: 0};
if (!targetInfo) {
return defaultPosition;
}
// If targetInfo is fetched by 'retrieveTargetInfo',
// old tree and new tree are the same tree,
// so the node still exists and we can visit it.
const targetNode = targetInfo.node;
const layout = targetNode.getLayout();
if (!layout) {
return defaultPosition;
}
// Transform coord from local to container.
const targetCenter = [layout.width / 2, layout.height / 2];
let node = targetNode;
while (node) {
const nodeLayout = node.getLayout();
targetCenter[0] += nodeLayout.x;
targetCenter[1] += nodeLayout.y;
node = node.parentNode;
}
return {
x: layoutInfo.width / 2 - targetCenter[0],
y: layoutInfo.height / 2 - targetCenter[1]
};
}
// Mark nodes visible for prunning when visual coding and rendering.
// Prunning depends on layout and root position, so we have to do it after layout.
function prunning(
node: TreemapLayoutNode,
clipRect: BoundingRect,
viewAbovePath: TreemapLayoutNode[],
viewRoot: TreemapLayoutNode,
depth: number
) {
const nodeLayout = node.getLayout();
const nodeInViewAbovePath = viewAbovePath[depth];
const isAboveViewRoot = nodeInViewAbovePath && nodeInViewAbovePath === node;
if (
(nodeInViewAbovePath && !isAboveViewRoot)
|| (depth === viewAbovePath.length && node !== viewRoot)
) {
return;
}
node.setLayout({
// isInView means: viewRoot sub tree + viewAbovePath
isInView: true,
// invisible only means: outside view clip so that the node can not
// see but still layout for animation preparation but not render.
invisible: !isAboveViewRoot && !clipRect.intersect(nodeLayout),
isAboveViewRoot
}, true);
// Transform to child coordinate.
const childClipRect = new BoundingRect(
clipRect.x - nodeLayout.x,
clipRect.y - nodeLayout.y,
clipRect.width,
clipRect.height
);
each(node.viewChildren || [], function (child) {
prunning(child, childClipRect, viewAbovePath, viewRoot, depth + 1);
});
}
function getUpperLabelHeight(model: NodeModel): number {
return model.get(PATH_UPPER_LABEL_SHOW) ? model.get(PATH_UPPER_LABEL_HEIGHT) : 0;
}
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