| /* |
| * 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 vec2 from 'zrender/src/core/vector'; |
| import { getSymbolSize, getNodeGlobalScale } from './graphHelper'; |
| var PI = Math.PI; |
| var _symbolRadiansHalf = []; |
| /** |
| * `basedOn` can be: |
| * 'value': |
| * This layout is not accurate and have same bad case. For example, |
| * if the min value is very smaller than the max value, the nodes |
| * with the min value probably overlap even though there is enough |
| * space to layout them. So we only use this approach in the as the |
| * init layout of the force layout. |
| * FIXME |
| * Probably we do not need this method any more but use |
| * `basedOn: 'symbolSize'` in force layout if |
| * delay its init operations to GraphView. |
| * 'symbolSize': |
| * This approach work only if all of the symbol size calculated. |
| * That is, the progressive rendering is not applied to graph. |
| * FIXME |
| * If progressive rendering is applied to graph some day, |
| * probably we have to use `basedOn: 'value'`. |
| * |
| * @param {module:echarts/src/model/Series} seriesModel |
| * @param {string} basedOn 'value' or 'symbolSize' |
| */ |
| |
| export function circularLayout(seriesModel, basedOn) { |
| var coordSys = seriesModel.coordinateSystem; |
| |
| if (coordSys && coordSys.type !== 'view') { |
| return; |
| } |
| |
| var rect = coordSys.getBoundingRect(); |
| var nodeData = seriesModel.getData(); |
| var graph = nodeData.graph; |
| var cx = rect.width / 2 + rect.x; |
| var cy = rect.height / 2 + rect.y; |
| var r = Math.min(rect.width, rect.height) / 2; |
| var count = nodeData.count(); |
| nodeData.setLayout({ |
| cx: cx, |
| cy: cy |
| }); |
| |
| if (!count) { |
| return; |
| } |
| |
| _layoutNodesBasedOn[basedOn](seriesModel, coordSys, graph, nodeData, r, cx, cy, count); |
| |
| graph.eachEdge(function (edge) { |
| var curveness = edge.getModel().get('lineStyle.curveness') || 0; |
| var p1 = vec2.clone(edge.node1.getLayout()); |
| var p2 = vec2.clone(edge.node2.getLayout()); |
| var cp1; |
| var x12 = (p1[0] + p2[0]) / 2; |
| var y12 = (p1[1] + p2[1]) / 2; |
| |
| if (+curveness) { |
| curveness *= 3; |
| cp1 = [cx * curveness + x12 * (1 - curveness), cy * curveness + y12 * (1 - curveness)]; |
| } |
| |
| edge.setLayout([p1, p2, cp1]); |
| }); |
| } |
| var _layoutNodesBasedOn = { |
| value: function (seriesModel, coordSys, graph, nodeData, r, cx, cy, count) { |
| var angle = 0; |
| var sum = nodeData.getSum('value'); |
| var unitAngle = Math.PI * 2 / (sum || count); |
| graph.eachNode(function (node) { |
| var value = node.getValue('value'); |
| var radianHalf = unitAngle * (sum ? value : 1) / 2; |
| angle += radianHalf; |
| node.setLayout([r * Math.cos(angle) + cx, r * Math.sin(angle) + cy]); |
| angle += radianHalf; |
| }); |
| }, |
| symbolSize: function (seriesModel, coordSys, graph, nodeData, r, cx, cy, count) { |
| var sumRadian = 0; |
| _symbolRadiansHalf.length = count; |
| var nodeScale = getNodeGlobalScale(seriesModel); |
| graph.eachNode(function (node) { |
| var symbolSize = getSymbolSize(node); // Normally this case will not happen, but we still add |
| // some the defensive code (2px is an arbitrary value). |
| |
| isNaN(symbolSize) && (symbolSize = 2); |
| symbolSize < 0 && (symbolSize = 0); |
| symbolSize *= nodeScale; |
| var symbolRadianHalf = Math.asin(symbolSize / 2 / r); // when `symbolSize / 2` is bigger than `r`. |
| |
| isNaN(symbolRadianHalf) && (symbolRadianHalf = PI / 2); |
| _symbolRadiansHalf[node.dataIndex] = symbolRadianHalf; |
| sumRadian += symbolRadianHalf * 2; |
| }); |
| var halfRemainRadian = (2 * PI - sumRadian) / count / 2; |
| var angle = 0; |
| graph.eachNode(function (node) { |
| var radianHalf = halfRemainRadian + _symbolRadiansHalf[node.dataIndex]; |
| angle += radianHalf; |
| node.setLayout([r * Math.cos(angle) + cx, r * Math.sin(angle) + cy]); |
| angle += radianHalf; |
| }); |
| } |
| }; |