themeRiverLayout.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.
*/
/**
* @file Using layout algorithm transform the raw data to layout information.
* @author Deqing Li(annong035@gmail.com)
*/
import * as zrUtil from 'zrender/src/core/util';
import * as numberUtil from '../../util/number';
export default function (ecModel, api) {
ecModel.eachSeriesByType('themeRiver', function (seriesModel) {
var data = seriesModel.getData();
var single = seriesModel.coordinateSystem;
var layoutInfo = {};
// use the axis boundingRect for view
var rect = single.getRect();
layoutInfo.rect = rect;
var boundaryGap = seriesModel.get('boundaryGap');
var axis = single.getAxis();
layoutInfo.boundaryGap = boundaryGap;
if (axis.orient === 'horizontal') {
boundaryGap[0] = numberUtil.parsePercent(boundaryGap[0], rect.height);
boundaryGap[1] = numberUtil.parsePercent(boundaryGap[1], rect.height);
var height = rect.height - boundaryGap[0] - boundaryGap[1];
themeRiverLayout(data, seriesModel, height);
}
else {
boundaryGap[0] = numberUtil.parsePercent(boundaryGap[0], rect.width);
boundaryGap[1] = numberUtil.parsePercent(boundaryGap[1], rect.width);
var width = rect.width - boundaryGap[0] - boundaryGap[1];
themeRiverLayout(data, seriesModel, width);
}
data.setLayout('layoutInfo', layoutInfo);
});
}
/**
* The layout information about themeriver
*
* @param {module:echarts/data/List} data data in the series
* @param {module:echarts/model/Series} seriesModel the model object of themeRiver series
* @param {number} height value used to compute every series height
*/
function themeRiverLayout(data, seriesModel, height) {
if (!data.count()) {
return;
}
var coordSys = seriesModel.coordinateSystem;
// the data in each layer are organized into a series.
var layerSeries = seriesModel.getLayerSeries();
// the points in each layer.
var timeDim = data.mapDimension('single');
var valueDim = data.mapDimension('value');
var layerPoints = zrUtil.map(layerSeries, function (singleLayer) {
return zrUtil.map(singleLayer.indices, function (idx) {
var pt = coordSys.dataToPoint(data.get(timeDim, idx));
pt[1] = data.get(valueDim, idx);
return pt;
});
});
var base = computeBaseline(layerPoints);
var baseLine = base.y0;
var ky = height / base.max;
// set layout information for each item.
var n = layerSeries.length;
var m = layerSeries[0].indices.length;
var baseY0;
for (var j = 0; j < m; ++j) {
baseY0 = baseLine[j] * ky;
data.setItemLayout(layerSeries[0].indices[j], {
layerIndex: 0,
x: layerPoints[0][j][0],
y0: baseY0,
y: layerPoints[0][j][1] * ky
});
for (var i = 1; i < n; ++i) {
baseY0 += layerPoints[i - 1][j][1] * ky;
data.setItemLayout(layerSeries[i].indices[j], {
layerIndex: i,
x: layerPoints[i][j][0],
y0: baseY0,
y: layerPoints[i][j][1] * ky
});
}
}
}
/**
* Compute the baseLine of the rawdata
* Inspired by Lee Byron's paper Stacked Graphs - Geometry & Aesthetics
*
* @param {Array.<Array>} data the points in each layer
* @return {Object}
*/
function computeBaseline(data) {
var layerNum = data.length;
var pointNum = data[0].length;
var sums = [];
var y0 = [];
var max = 0;
var temp;
var base = {};
for (var i = 0; i < pointNum; ++i) {
for (var j = 0, temp = 0; j < layerNum; ++j) {
temp += data[j][i][1];
}
if (temp > max) {
max = temp;
}
sums.push(temp);
}
for (var k = 0; k < pointNum; ++k) {
y0[k] = (max - sums[k]) / 2;
}
max = 0;
for (var l = 0; l < pointNum; ++l) {
var sum = sums[l] + y0[l];
if (sum > max) {
max = sum;
}
}
base.y0 = y0;
base.max = max;
return base;
}