123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141 |
- 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 count === 0 ? NaN : sum / count;
- },
- sum: function (frame) {
- var sum = 0;
- for (var i = 0; i < frame.length; i++) {
-
- 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]);
- }
-
- 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]);
- }
-
- return isFinite(min) ? min : NaN;
- },
- minmax: function (frame) {
- var turningPointAbsoluteValue = -Infinity;
- var turningPointOriginalValue = -Infinity;
- for (var i = 0; i < frame.length; i++) {
- var originalValue = frame[i];
- var absoluteValue = Math.abs(originalValue);
- if (absoluteValue > turningPointAbsoluteValue) {
- turningPointAbsoluteValue = absoluteValue;
- turningPointOriginalValue = originalValue;
- }
- }
- return isFinite(turningPointOriginalValue) ? turningPointOriginalValue : NaN;
- },
-
-
- nearest: function (frame) {
- return frame[0];
- }
- };
- var indexSampler = function (frame) {
- return Math.round(frame.length / 2);
- };
- export default function dataSample(seriesType) {
- return {
- seriesType: seriesType,
-
-
- reset: function (seriesModel, ecModel, api) {
- var data = seriesModel.getData();
- var sampling = seriesModel.get('sampling');
- var coordSys = seriesModel.coordinateSystem;
- var count = data.count();
-
- if (count > 10 && coordSys.type === 'cartesian2d' && sampling) {
- var baseAxis = coordSys.getBaseAxis();
- var valueAxis = coordSys.getOtherAxis(baseAxis);
- var extent = baseAxis.getExtent();
- var dpr = api.getDevicePixelRatio();
-
- 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) {
-
- seriesModel.setData(data.downSample(data.mapDimension(valueAxis.dim), 1 / rate, sampler, indexSampler));
- }
- }
- }
- }
- };
- }
|