|
/*
|
* 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.
|
*/
|
|
|
/**
|
* AUTO-GENERATED FILE. DO NOT MODIFY.
|
*/
|
|
/*
|
* 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 { isFunction, isString } from 'zrender/lib/core/util.js';
|
var samplers = {
|
average: function (frame) {
|
var sum = 0;
|
var count = 0;
|
|
for (var i = 0; i < frame.length; i++) {
|
if (!isNaN(frame[i])) {
|
sum += frame[i];
|
count++;
|
}
|
} // Return NaN if count is 0
|
|
|
return count === 0 ? NaN : sum / count;
|
},
|
sum: function (frame) {
|
var sum = 0;
|
|
for (var i = 0; i < frame.length; i++) {
|
// Ignore NaN
|
sum += frame[i] || 0;
|
}
|
|
return sum;
|
},
|
max: function (frame) {
|
var max = -Infinity;
|
|
for (var i = 0; i < frame.length; i++) {
|
frame[i] > max && (max = frame[i]);
|
} // NaN will cause illegal axis extent.
|
|
|
return isFinite(max) ? max : NaN;
|
},
|
min: function (frame) {
|
var min = Infinity;
|
|
for (var i = 0; i < frame.length; i++) {
|
frame[i] < min && (min = frame[i]);
|
} // NaN will cause illegal axis extent.
|
|
|
return isFinite(min) ? min : NaN;
|
},
|
// TODO
|
// Median
|
nearest: function (frame) {
|
return frame[0];
|
}
|
};
|
|
var indexSampler = function (frame) {
|
return Math.round(frame.length / 2);
|
};
|
|
export default function dataSample(seriesType) {
|
return {
|
seriesType: seriesType,
|
// FIXME:TS never used, so comment it
|
// modifyOutputEnd: true,
|
reset: function (seriesModel, ecModel, api) {
|
var data = seriesModel.getData();
|
var sampling = seriesModel.get('sampling');
|
var coordSys = seriesModel.coordinateSystem;
|
var count = data.count(); // Only cartesian2d support down sampling. Disable it when there is few data.
|
|
if (count > 10 && coordSys.type === 'cartesian2d' && sampling) {
|
var baseAxis = coordSys.getBaseAxis();
|
var valueAxis = coordSys.getOtherAxis(baseAxis);
|
var extent = baseAxis.getExtent();
|
var dpr = api.getDevicePixelRatio(); // Coordinste system has been resized
|
|
var size = Math.abs(extent[1] - extent[0]) * (dpr || 1);
|
var rate = Math.round(count / size);
|
|
if (isFinite(rate) && rate > 1) {
|
if (sampling === 'lttb') {
|
seriesModel.setData(data.lttbDownSample(data.mapDimension(valueAxis.dim), 1 / rate));
|
}
|
|
var sampler = void 0;
|
|
if (isString(sampling)) {
|
sampler = samplers[sampling];
|
} else if (isFunction(sampling)) {
|
sampler = sampling;
|
}
|
|
if (sampler) {
|
// Only support sample the first dim mapped from value axis.
|
seriesModel.setData(data.downSample(data.mapDimension(valueAxis.dim), 1 / rate, sampler, indexSampler));
|
}
|
}
|
}
|
}
|
};
|
}
|
