chordCircularLayout.js
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/*
* 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.
*/
/**
* Chord layout
* @module echarts/chart/chord/chordCircularLayout
* @author pissang(http://github.com/pissang)
*/
import * as zrUtil from 'zrender/src/core/util';
import {parsePercent} from '../../util/number';
/**
* @param {module:echarts/data/Graph} graph
*/
function layout(graphs, opts) {
if (!zrUtil.isArray(graphs)) {
graphs = [graphs];
}
var graph0 = graphs[0];
var groups = [];
// Init groups
graph0.eachNode(function (node) {
var group = {
size: 0,
subGroups: [],
node: node
};
groups.push(group);
});
zrUtil.each(graphs, function (graph) {
graph.eachEdge(function (edge) {
var g1 = groups[edge.node1.dataIndex];
g1.size += edge.getValue('value') || 0;
g1.subGroups.push({
size: edge.getValue('value'),
edge: edge
});
});
});
var sumSize = zrUtil.reduce(groups, function (sumSize, group) {
return sumSize + group.size;
}, 0);
if (opts.sort && opts.sort !== 'none') {
groups.sort(compareGroups);
if (opts.sort === 'descending') {
groups.reverse();
}
}
var unitAngle = (Math.PI * 2 - opts.padding * graph0.data.count()) / sumSize;
var angle = opts.startAngle * Math.PI / 180;
var sign = opts.clockwise ? -1 : 1;
zrUtil.each(groups, function (group) {
if (opts.sortSub && opts.sortSub !== 'none') {
group.subGroups.sort(compareGroups);
if (opts.sortSub === 'descending') {
group.subGroups.reverse();
}
}
var endAngle = angle + sign * group.size * unitAngle;
group.node.setLayout({
startAngle: -angle,
endAngle: -endAngle,
cx: opts.cx,
cy: opts.cy,
r0: opts.r0,
r: opts.r,
clockwise: opts.clockwise
});
zrUtil.each(group.subGroups, function (subGroup) {
var startAngle = angle;
var endAngle = angle + sign * subGroup.size * unitAngle;
var layout = subGroup.edge.getLayout() || {
cx: opts.cx,
cy: opts.cy,
r: opts.r0,
clockwise: opts.clockwise
};
layout.startAngle = -startAngle;
layout.endAngle = -endAngle;
subGroup.edge.setLayout(layout);
angle = endAngle;
});
angle = endAngle + sign * opts.padding;
});
}
var compareGroups = function (a, b) {
return a.size - b.size;
};
export default function (ecModel, api, payload) {
ecModel.eachSeriesByType('chord', function (chordSeries) {
var graph = chordSeries.getGraph();
var center = chordSeries.get('center');
var radius = chordSeries.get('radius');
var viewWidth = api.getWidth();
var viewHeight = api.getHeight();
var viewSize = Math.min(viewWidth, viewHeight) / 2;
layout(graph, {
sort: chordSeries.get('sort'),
sortSub: chordSeries.get('sortSub'),
padding: chordSeries.get('padding'),
startAngle: chordSeries.get('startAngle'),
clockwise: chordSeries.get('clockwise'),
cx: parsePercent(center[0], viewWidth),
cy: parsePercent(center[1], viewHeight),
r0: parsePercent(radius[0], viewSize),
r: parsePercent(radius[1], viewSize)
});
});
}