public/zh/builder/src/echarts/chart/heatmap/HeatmapView.js

/*
* 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 { __DEV__ } from '../../config';
import * as echarts from '../../echarts';
import * as graphic from '../../util/graphic';
import HeatmapLayer from './HeatmapLayer';
import * as zrUtil from 'zrender/src/core/util';

function getIsInPiecewiseRange(dataExtent, pieceList, selected) {
  var dataSpan = dataExtent[1] - dataExtent[0];
  pieceList = zrUtil.map(pieceList, function (piece) {
    return {
      interval: [(piece.interval[0] - dataExtent[0]) / dataSpan, (piece.interval[1] - dataExtent[0]) / dataSpan]
    };
  });
  var len = pieceList.length;
  var lastIndex = 0;
  return function (val) {
    // Try to find in the location of the last found
    for (var i = lastIndex; i < len; i++) {
      var interval = pieceList[i].interval;

      if (interval[0] <= val && val <= interval[1]) {
        lastIndex = i;
        break;
      }
    }

    if (i === len) {
      // Not found, back interation
      for (var i = lastIndex - 1; i >= 0; i--) {
        var interval = pieceList[i].interval;

        if (interval[0] <= val && val <= interval[1]) {
          lastIndex = i;
          break;
        }
      }
    }

    return i >= 0 && i < len && selected[i];
  };
}

function getIsInContinuousRange(dataExtent, range) {
  var dataSpan = dataExtent[1] - dataExtent[0];
  range = [(range[0] - dataExtent[0]) / dataSpan, (range[1] - dataExtent[0]) / dataSpan];
  return function (val) {
    return val >= range[0] && val <= range[1];
  };
}

function isGeoCoordSys(coordSys) {
  var dimensions = coordSys.dimensions; // Not use coorSys.type === 'geo' because coordSys maybe extended

  return dimensions[0] === 'lng' && dimensions[1] === 'lat';
}

export default echarts.extendChartView({
  type: 'heatmap',
  render: function (seriesModel, ecModel, api) {
    var visualMapOfThisSeries;
    ecModel.eachComponent('visualMap', function (visualMap) {
      visualMap.eachTargetSeries(function (targetSeries) {
        if (targetSeries === seriesModel) {
          visualMapOfThisSeries = visualMap;
        }
      });
    });
    this.group.removeAll();
    this._incrementalDisplayable = null;
    var coordSys = seriesModel.coordinateSystem;

    if (coordSys.type === 'cartesian2d' || coordSys.type === 'calendar') {
      this._renderOnCartesianAndCalendar(seriesModel, api, 0, seriesModel.getData().count());
    } else if (isGeoCoordSys(coordSys)) {
      this._renderOnGeo(coordSys, seriesModel, visualMapOfThisSeries, api);
    }
  },
  incrementalPrepareRender: function (seriesModel, ecModel, api) {
    this.group.removeAll();
  },
  incrementalRender: function (params, seriesModel, ecModel, api) {
    var coordSys = seriesModel.coordinateSystem;

    if (coordSys) {
      this._renderOnCartesianAndCalendar(seriesModel, api, params.start, params.end, true);
    }
  },
  _renderOnCartesianAndCalendar: function (seriesModel, api, start, end, incremental) {
    var coordSys = seriesModel.coordinateSystem;
    var width;
    var height;

    if (coordSys.type === 'cartesian2d') {
      var xAxis = coordSys.getAxis('x');
      var yAxis = coordSys.getAxis('y');
      width = xAxis.getBandWidth();
      height = yAxis.getBandWidth();
    }

    var group = this.group;
    var data = seriesModel.getData();
    var itemStyleQuery = 'itemStyle';
    var hoverItemStyleQuery = 'emphasis.itemStyle';
    var labelQuery = 'label';
    var hoverLabelQuery = 'emphasis.label';
    var style = seriesModel.getModel(itemStyleQuery).getItemStyle(['color']);
    var hoverStl = seriesModel.getModel(hoverItemStyleQuery).getItemStyle();
    var labelModel = seriesModel.getModel(labelQuery);
    var hoverLabelModel = seriesModel.getModel(hoverLabelQuery);
    var coordSysType = coordSys.type;
    var dataDims = coordSysType === 'cartesian2d' ? [data.mapDimension('x'), data.mapDimension('y'), data.mapDimension('value')] : [data.mapDimension('time'), data.mapDimension('value')];

    for (var idx = start; idx < end; idx++) {
      var rect;

      if (coordSysType === 'cartesian2d') {
        // Ignore empty data
        if (isNaN(data.get(dataDims[2], idx))) {
          continue;
        }

        var point = coordSys.dataToPoint([data.get(dataDims[0], idx), data.get(dataDims[1], idx)]);
        rect = new graphic.Rect({
          shape: {
            x: point[0] - width / 2,
            y: point[1] - height / 2,
            width: width,
            height: height
          },
          style: {
            fill: data.getItemVisual(idx, 'color'),
            opacity: data.getItemVisual(idx, 'opacity')
          }
        });
      } else {
        // Ignore empty data
        if (isNaN(data.get(dataDims[1], idx))) {
          continue;
        }

        rect = new graphic.Rect({
          z2: 1,
          shape: coordSys.dataToRect([data.get(dataDims[0], idx)]).contentShape,
          style: {
            fill: data.getItemVisual(idx, 'color'),
            opacity: data.getItemVisual(idx, 'opacity')
          }
        });
      }

      var itemModel = data.getItemModel(idx); // Optimization for large datset

      if (data.hasItemOption) {
        style = itemModel.getModel(itemStyleQuery).getItemStyle(['color']);
        hoverStl = itemModel.getModel(hoverItemStyleQuery).getItemStyle();
        labelModel = itemModel.getModel(labelQuery);
        hoverLabelModel = itemModel.getModel(hoverLabelQuery);
      }

      var rawValue = seriesModel.getRawValue(idx);
      var defaultText = '-';

      if (rawValue && rawValue[2] != null) {
        defaultText = rawValue[2];
      }

      graphic.setLabelStyle(style, hoverStl, labelModel, hoverLabelModel, {
        labelFetcher: seriesModel,
        labelDataIndex: idx,
        defaultText: defaultText,
        isRectText: true
      });
      rect.setStyle(style);
      graphic.setHoverStyle(rect, data.hasItemOption ? hoverStl : zrUtil.extend({}, hoverStl));
      rect.incremental = incremental; // PENDING

      if (incremental) {
        // Rect must use hover layer if it's incremental.
        rect.useHoverLayer = true;
      }

      group.add(rect);
      data.setItemGraphicEl(idx, rect);
    }
  },
  _renderOnGeo: function (geo, seriesModel, visualMapModel, api) {
    var inRangeVisuals = visualMapModel.targetVisuals.inRange;
    var outOfRangeVisuals = visualMapModel.targetVisuals.outOfRange; // if (!visualMapping) {
    //     throw new Error('Data range must have color visuals');
    // }

    var data = seriesModel.getData();
    var hmLayer = this._hmLayer || this._hmLayer || new HeatmapLayer();
    hmLayer.blurSize = seriesModel.get('blurSize');
    hmLayer.pointSize = seriesModel.get('pointSize');
    hmLayer.minOpacity = seriesModel.get('minOpacity');
    hmLayer.maxOpacity = seriesModel.get('maxOpacity');
    var rect = geo.getViewRect().clone();
    var roamTransform = geo.getRoamTransform();
    rect.applyTransform(roamTransform); // Clamp on viewport

    var x = Math.max(rect.x, 0);
    var y = Math.max(rect.y, 0);
    var x2 = Math.min(rect.width + rect.x, api.getWidth());
    var y2 = Math.min(rect.height + rect.y, api.getHeight());
    var width = x2 - x;
    var height = y2 - y;
    var dims = [data.mapDimension('lng'), data.mapDimension('lat'), data.mapDimension('value')];
    var points = data.mapArray(dims, function (lng, lat, value) {
      var pt = geo.dataToPoint([lng, lat]);
      pt[0] -= x;
      pt[1] -= y;
      pt.push(value);
      return pt;
    });
    var dataExtent = visualMapModel.getExtent();
    var isInRange = visualMapModel.type === 'visualMap.continuous' ? getIsInContinuousRange(dataExtent, visualMapModel.option.range) : getIsInPiecewiseRange(dataExtent, visualMapModel.getPieceList(), visualMapModel.option.selected);
    hmLayer.update(points, width, height, inRangeVisuals.color.getNormalizer(), {
      inRange: inRangeVisuals.color.getColorMapper(),
      outOfRange: outOfRangeVisuals.color.getColorMapper()
    }, isInRange);
    var img = new graphic.Image({
      style: {
        width: width,
        height: height,
        x: x,
        y: y,
        image: hmLayer.canvas
      },
      silent: true
    });
    this.group.add(img);
  },
  dispose: function () {}
});