public/en/builder/src/echarts/component/visualMap/ContinuousView.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 * as zrUtil from 'zrender/src/core/util';
import LinearGradient from 'zrender/src/graphic/LinearGradient';
import * as eventTool from 'zrender/src/core/event';
import VisualMapView from './VisualMapView';
import * as graphic from '../../util/graphic';
import * as numberUtil from '../../util/number';
import sliderMove from '../helper/sliderMove';
import * as helper from './helper';
import * as modelUtil from '../../util/model';
var linearMap = numberUtil.linearMap;
var each = zrUtil.each;
var mathMin = Math.min;
var mathMax = Math.max; // Arbitrary value

var HOVER_LINK_SIZE = 12;
var HOVER_LINK_OUT = 6; // Notice:
// Any "interval" should be by the order of [low, high].
// "handle0" (handleIndex === 0) maps to
// low data value: this._dataInterval[0] and has low coord.
// "handle1" (handleIndex === 1) maps to
// high data value: this._dataInterval[1] and has high coord.
// The logic of transform is implemented in this._createBarGroup.

var ContinuousView = VisualMapView.extend({
  type: 'visualMap.continuous',

  /**
   * @override
   */
  init: function () {
    ContinuousView.superApply(this, 'init', arguments);
    /**
     * @private
     */

    this._shapes = {};
    /**
     * @private
     */

    this._dataInterval = [];
    /**
     * @private
     */

    this._handleEnds = [];
    /**
     * @private
     */

    this._orient;
    /**
     * @private
     */

    this._useHandle;
    /**
     * @private
     */

    this._hoverLinkDataIndices = [];
    /**
     * @private
     */

    this._dragging;
    /**
     * @private
     */

    this._hovering;
  },

  /**
   * @protected
   * @override
   */
  doRender: function (visualMapModel, ecModel, api, payload) {
    if (!payload || payload.type !== 'selectDataRange' || payload.from !== this.uid) {
      this._buildView();
    }
  },

  /**
   * @private
   */
  _buildView: function () {
    this.group.removeAll();
    var visualMapModel = this.visualMapModel;
    var thisGroup = this.group;
    this._orient = visualMapModel.get('orient');
    this._useHandle = visualMapModel.get('calculable');

    this._resetInterval();

    this._renderBar(thisGroup);

    var dataRangeText = visualMapModel.get('text');

    this._renderEndsText(thisGroup, dataRangeText, 0);

    this._renderEndsText(thisGroup, dataRangeText, 1); // Do this for background size calculation.


    this._updateView(true); // After updating view, inner shapes is built completely,
    // and then background can be rendered.


    this.renderBackground(thisGroup); // Real update view

    this._updateView();

    this._enableHoverLinkToSeries();

    this._enableHoverLinkFromSeries();

    this.positionGroup(thisGroup);
  },

  /**
   * @private
   */
  _renderEndsText: function (group, dataRangeText, endsIndex) {
    if (!dataRangeText) {
      return;
    } // Compatible with ec2, text[0] map to high value, text[1] map low value.


    var text = dataRangeText[1 - endsIndex];
    text = text != null ? text + '' : '';
    var visualMapModel = this.visualMapModel;
    var textGap = visualMapModel.get('textGap');
    var itemSize = visualMapModel.itemSize;
    var barGroup = this._shapes.barGroup;

    var position = this._applyTransform([itemSize[0] / 2, endsIndex === 0 ? -textGap : itemSize[1] + textGap], barGroup);

    var align = this._applyTransform(endsIndex === 0 ? 'bottom' : 'top', barGroup);

    var orient = this._orient;
    var textStyleModel = this.visualMapModel.textStyleModel;
    this.group.add(new graphic.Text({
      style: {
        x: position[0],
        y: position[1],
        textVerticalAlign: orient === 'horizontal' ? 'middle' : align,
        textAlign: orient === 'horizontal' ? align : 'center',
        text: text,
        textFont: textStyleModel.getFont(),
        textFill: textStyleModel.getTextColor()
      }
    }));
  },

  /**
   * @private
   */
  _renderBar: function (targetGroup) {
    var visualMapModel = this.visualMapModel;
    var shapes = this._shapes;
    var itemSize = visualMapModel.itemSize;
    var orient = this._orient;
    var useHandle = this._useHandle;
    var itemAlign = helper.getItemAlign(visualMapModel, this.api, itemSize);

    var barGroup = shapes.barGroup = this._createBarGroup(itemAlign); // Bar


    barGroup.add(shapes.outOfRange = createPolygon());
    barGroup.add(shapes.inRange = createPolygon(null, useHandle ? getCursor(this._orient) : null, zrUtil.bind(this._dragHandle, this, 'all', false), zrUtil.bind(this._dragHandle, this, 'all', true)));
    var textRect = visualMapModel.textStyleModel.getTextRect('国');
    var textSize = mathMax(textRect.width, textRect.height); // Handle

    if (useHandle) {
      shapes.handleThumbs = [];
      shapes.handleLabels = [];
      shapes.handleLabelPoints = [];

      this._createHandle(barGroup, 0, itemSize, textSize, orient, itemAlign);

      this._createHandle(barGroup, 1, itemSize, textSize, orient, itemAlign);
    }

    this._createIndicator(barGroup, itemSize, textSize, orient);

    targetGroup.add(barGroup);
  },

  /**
   * @private
   */
  _createHandle: function (barGroup, handleIndex, itemSize, textSize, orient) {
    var onDrift = zrUtil.bind(this._dragHandle, this, handleIndex, false);
    var onDragEnd = zrUtil.bind(this._dragHandle, this, handleIndex, true);
    var handleThumb = createPolygon(createHandlePoints(handleIndex, textSize), getCursor(this._orient), onDrift, onDragEnd);
    handleThumb.position[0] = itemSize[0];
    barGroup.add(handleThumb); // Text is always horizontal layout but should not be effected by
    // transform (orient/inverse). So label is built separately but not
    // use zrender/graphic/helper/RectText, and is located based on view
    // group (according to handleLabelPoint) but not barGroup.

    var textStyleModel = this.visualMapModel.textStyleModel;
    var handleLabel = new graphic.Text({
      draggable: true,
      drift: onDrift,
      onmousemove: function (e) {
        // Fot mobile devicem, prevent screen slider on the button.
        eventTool.stop(e.event);
      },
      ondragend: onDragEnd,
      style: {
        x: 0,
        y: 0,
        text: '',
        textFont: textStyleModel.getFont(),
        textFill: textStyleModel.getTextColor()
      }
    });
    this.group.add(handleLabel);
    var handleLabelPoint = [orient === 'horizontal' ? textSize / 2 : textSize * 1.5, orient === 'horizontal' ? handleIndex === 0 ? -(textSize * 1.5) : textSize * 1.5 : handleIndex === 0 ? -textSize / 2 : textSize / 2];
    var shapes = this._shapes;
    shapes.handleThumbs[handleIndex] = handleThumb;
    shapes.handleLabelPoints[handleIndex] = handleLabelPoint;
    shapes.handleLabels[handleIndex] = handleLabel;
  },

  /**
   * @private
   */
  _createIndicator: function (barGroup, itemSize, textSize, orient) {
    var indicator = createPolygon([[0, 0]], 'move');
    indicator.position[0] = itemSize[0];
    indicator.attr({
      invisible: true,
      silent: true
    });
    barGroup.add(indicator);
    var textStyleModel = this.visualMapModel.textStyleModel;
    var indicatorLabel = new graphic.Text({
      silent: true,
      invisible: true,
      style: {
        x: 0,
        y: 0,
        text: '',
        textFont: textStyleModel.getFont(),
        textFill: textStyleModel.getTextColor()
      }
    });
    this.group.add(indicatorLabel);
    var indicatorLabelPoint = [orient === 'horizontal' ? textSize / 2 : HOVER_LINK_OUT + 3, 0];
    var shapes = this._shapes;
    shapes.indicator = indicator;
    shapes.indicatorLabel = indicatorLabel;
    shapes.indicatorLabelPoint = indicatorLabelPoint;
  },

  /**
   * @private
   */
  _dragHandle: function (handleIndex, isEnd, dx, dy) {
    if (!this._useHandle) {
      return;
    }

    this._dragging = !isEnd;

    if (!isEnd) {
      // Transform dx, dy to bar coordination.
      var vertex = this._applyTransform([dx, dy], this._shapes.barGroup, true);

      this._updateInterval(handleIndex, vertex[1]); // Considering realtime, update view should be executed
      // before dispatch action.


      this._updateView();
    } // dragEnd do not dispatch action when realtime.


    if (isEnd === !this.visualMapModel.get('realtime')) {
      // jshint ignore:line
      this.api.dispatchAction({
        type: 'selectDataRange',
        from: this.uid,
        visualMapId: this.visualMapModel.id,
        selected: this._dataInterval.slice()
      });
    }

    if (isEnd) {
      !this._hovering && this._clearHoverLinkToSeries();
    } else if (useHoverLinkOnHandle(this.visualMapModel)) {
      this._doHoverLinkToSeries(this._handleEnds[handleIndex], false);
    }
  },

  /**
   * @private
   */
  _resetInterval: function () {
    var visualMapModel = this.visualMapModel;
    var dataInterval = this._dataInterval = visualMapModel.getSelected();
    var dataExtent = visualMapModel.getExtent();
    var sizeExtent = [0, visualMapModel.itemSize[1]];
    this._handleEnds = [linearMap(dataInterval[0], dataExtent, sizeExtent, true), linearMap(dataInterval[1], dataExtent, sizeExtent, true)];
  },

  /**
   * @private
   * @param {(number|string)} handleIndex 0 or 1 or 'all'
   * @param {number} dx
   * @param {number} dy
   */
  _updateInterval: function (handleIndex, delta) {
    delta = delta || 0;
    var visualMapModel = this.visualMapModel;
    var handleEnds = this._handleEnds;
    var sizeExtent = [0, visualMapModel.itemSize[1]];
    sliderMove(delta, handleEnds, sizeExtent, handleIndex, // cross is forbiden
    0);
    var dataExtent = visualMapModel.getExtent(); // Update data interval.

    this._dataInterval = [linearMap(handleEnds[0], sizeExtent, dataExtent, true), linearMap(handleEnds[1], sizeExtent, dataExtent, true)];
  },

  /**
   * @private
   */
  _updateView: function (forSketch) {
    var visualMapModel = this.visualMapModel;
    var dataExtent = visualMapModel.getExtent();
    var shapes = this._shapes;
    var outOfRangeHandleEnds = [0, visualMapModel.itemSize[1]];
    var inRangeHandleEnds = forSketch ? outOfRangeHandleEnds : this._handleEnds;

    var visualInRange = this._createBarVisual(this._dataInterval, dataExtent, inRangeHandleEnds, 'inRange');

    var visualOutOfRange = this._createBarVisual(dataExtent, dataExtent, outOfRangeHandleEnds, 'outOfRange');

    shapes.inRange.setStyle({
      fill: visualInRange.barColor,
      opacity: visualInRange.opacity
    }).setShape('points', visualInRange.barPoints);
    shapes.outOfRange.setStyle({
      fill: visualOutOfRange.barColor,
      opacity: visualOutOfRange.opacity
    }).setShape('points', visualOutOfRange.barPoints);

    this._updateHandle(inRangeHandleEnds, visualInRange);
  },

  /**
   * @private
   */
  _createBarVisual: function (dataInterval, dataExtent, handleEnds, forceState) {
    var opts = {
      forceState: forceState,
      convertOpacityToAlpha: true
    };

    var colorStops = this._makeColorGradient(dataInterval, opts);

    var symbolSizes = [this.getControllerVisual(dataInterval[0], 'symbolSize', opts), this.getControllerVisual(dataInterval[1], 'symbolSize', opts)];

    var barPoints = this._createBarPoints(handleEnds, symbolSizes);

    return {
      barColor: new LinearGradient(0, 0, 0, 1, colorStops),
      barPoints: barPoints,
      handlesColor: [colorStops[0].color, colorStops[colorStops.length - 1].color]
    };
  },

  /**
   * @private
   */
  _makeColorGradient: function (dataInterval, opts) {
    // Considering colorHue, which is not linear, so we have to sample
    // to calculate gradient color stops, but not only caculate head
    // and tail.
    var sampleNumber = 100; // Arbitrary value.

    var colorStops = [];
    var step = (dataInterval[1] - dataInterval[0]) / sampleNumber;
    colorStops.push({
      color: this.getControllerVisual(dataInterval[0], 'color', opts),
      offset: 0
    });

    for (var i = 1; i < sampleNumber; i++) {
      var currValue = dataInterval[0] + step * i;

      if (currValue > dataInterval[1]) {
        break;
      }

      colorStops.push({
        color: this.getControllerVisual(currValue, 'color', opts),
        offset: i / sampleNumber
      });
    }

    colorStops.push({
      color: this.getControllerVisual(dataInterval[1], 'color', opts),
      offset: 1
    });
    return colorStops;
  },

  /**
   * @private
   */
  _createBarPoints: function (handleEnds, symbolSizes) {
    var itemSize = this.visualMapModel.itemSize;
    return [[itemSize[0] - symbolSizes[0], handleEnds[0]], [itemSize[0], handleEnds[0]], [itemSize[0], handleEnds[1]], [itemSize[0] - symbolSizes[1], handleEnds[1]]];
  },

  /**
   * @private
   */
  _createBarGroup: function (itemAlign) {
    var orient = this._orient;
    var inverse = this.visualMapModel.get('inverse');
    return new graphic.Group(orient === 'horizontal' && !inverse ? {
      scale: itemAlign === 'bottom' ? [1, 1] : [-1, 1],
      rotation: Math.PI / 2
    } : orient === 'horizontal' && inverse ? {
      scale: itemAlign === 'bottom' ? [-1, 1] : [1, 1],
      rotation: -Math.PI / 2
    } : orient === 'vertical' && !inverse ? {
      scale: itemAlign === 'left' ? [1, -1] : [-1, -1]
    } : {
      scale: itemAlign === 'left' ? [1, 1] : [-1, 1]
    });
  },

  /**
   * @private
   */
  _updateHandle: function (handleEnds, visualInRange) {
    if (!this._useHandle) {
      return;
    }

    var shapes = this._shapes;
    var visualMapModel = this.visualMapModel;
    var handleThumbs = shapes.handleThumbs;
    var handleLabels = shapes.handleLabels;
    each([0, 1], function (handleIndex) {
      var handleThumb = handleThumbs[handleIndex];
      handleThumb.setStyle('fill', visualInRange.handlesColor[handleIndex]);
      handleThumb.position[1] = handleEnds[handleIndex]; // Update handle label position.

      var textPoint = graphic.applyTransform(shapes.handleLabelPoints[handleIndex], graphic.getTransform(handleThumb, this.group));
      handleLabels[handleIndex].setStyle({
        x: textPoint[0],
        y: textPoint[1],
        text: visualMapModel.formatValueText(this._dataInterval[handleIndex]),
        textVerticalAlign: 'middle',
        textAlign: this._applyTransform(this._orient === 'horizontal' ? handleIndex === 0 ? 'bottom' : 'top' : 'left', shapes.barGroup)
      });
    }, this);
  },

  /**
   * @private
   * @param {number} cursorValue
   * @param {number} textValue
   * @param {string} [rangeSymbol]
   * @param {number} [halfHoverLinkSize]
   */
  _showIndicator: function (cursorValue, textValue, rangeSymbol, halfHoverLinkSize) {
    var visualMapModel = this.visualMapModel;
    var dataExtent = visualMapModel.getExtent();
    var itemSize = visualMapModel.itemSize;
    var sizeExtent = [0, itemSize[1]];
    var pos = linearMap(cursorValue, dataExtent, sizeExtent, true);
    var shapes = this._shapes;
    var indicator = shapes.indicator;

    if (!indicator) {
      return;
    }

    indicator.position[1] = pos;
    indicator.attr('invisible', false);
    indicator.setShape('points', createIndicatorPoints(!!rangeSymbol, halfHoverLinkSize, pos, itemSize[1]));
    var opts = {
      convertOpacityToAlpha: true
    };
    var color = this.getControllerVisual(cursorValue, 'color', opts);
    indicator.setStyle('fill', color); // Update handle label position.

    var textPoint = graphic.applyTransform(shapes.indicatorLabelPoint, graphic.getTransform(indicator, this.group));
    var indicatorLabel = shapes.indicatorLabel;
    indicatorLabel.attr('invisible', false);

    var align = this._applyTransform('left', shapes.barGroup);

    var orient = this._orient;
    indicatorLabel.setStyle({
      text: (rangeSymbol ? rangeSymbol : '') + visualMapModel.formatValueText(textValue),
      textVerticalAlign: orient === 'horizontal' ? align : 'middle',
      textAlign: orient === 'horizontal' ? 'center' : align,
      x: textPoint[0],
      y: textPoint[1]
    });
  },

  /**
   * @private
   */
  _enableHoverLinkToSeries: function () {
    var self = this;

    this._shapes.barGroup.on('mousemove', function (e) {
      self._hovering = true;

      if (!self._dragging) {
        var itemSize = self.visualMapModel.itemSize;

        var pos = self._applyTransform([e.offsetX, e.offsetY], self._shapes.barGroup, true, true); // For hover link show when hover handle, which might be
        // below or upper than sizeExtent.


        pos[1] = mathMin(mathMax(0, pos[1]), itemSize[1]);

        self._doHoverLinkToSeries(pos[1], 0 <= pos[0] && pos[0] <= itemSize[0]);
      }
    }).on('mouseout', function () {
      // When mouse is out of handle, hoverLink still need
      // to be displayed when realtime is set as false.
      self._hovering = false;
      !self._dragging && self._clearHoverLinkToSeries();
    });
  },

  /**
   * @private
   */
  _enableHoverLinkFromSeries: function () {
    var zr = this.api.getZr();

    if (this.visualMapModel.option.hoverLink) {
      zr.on('mouseover', this._hoverLinkFromSeriesMouseOver, this);
      zr.on('mouseout', this._hideIndicator, this);
    } else {
      this._clearHoverLinkFromSeries();
    }
  },

  /**
   * @private
   */
  _doHoverLinkToSeries: function (cursorPos, hoverOnBar) {
    var visualMapModel = this.visualMapModel;
    var itemSize = visualMapModel.itemSize;

    if (!visualMapModel.option.hoverLink) {
      return;
    }

    var sizeExtent = [0, itemSize[1]];
    var dataExtent = visualMapModel.getExtent(); // For hover link show when hover handle, which might be below or upper than sizeExtent.

    cursorPos = mathMin(mathMax(sizeExtent[0], cursorPos), sizeExtent[1]);
    var halfHoverLinkSize = getHalfHoverLinkSize(visualMapModel, dataExtent, sizeExtent);
    var hoverRange = [cursorPos - halfHoverLinkSize, cursorPos + halfHoverLinkSize];
    var cursorValue = linearMap(cursorPos, sizeExtent, dataExtent, true);
    var valueRange = [linearMap(hoverRange[0], sizeExtent, dataExtent, true), linearMap(hoverRange[1], sizeExtent, dataExtent, true)]; // Consider data range is out of visualMap range, see test/visualMap-continuous.html,
    // where china and india has very large population.

    hoverRange[0] < sizeExtent[0] && (valueRange[0] = -Infinity);
    hoverRange[1] > sizeExtent[1] && (valueRange[1] = Infinity); // Do not show indicator when mouse is over handle,
    // otherwise labels overlap, especially when dragging.

    if (hoverOnBar) {
      if (valueRange[0] === -Infinity) {
        this._showIndicator(cursorValue, valueRange[1], '< ', halfHoverLinkSize);
      } else if (valueRange[1] === Infinity) {
        this._showIndicator(cursorValue, valueRange[0], '> ', halfHoverLinkSize);
      } else {
        this._showIndicator(cursorValue, cursorValue, '≈ ', halfHoverLinkSize);
      }
    } // When realtime is set as false, handles, which are in barGroup,
    // also trigger hoverLink, which help user to realize where they
    // focus on when dragging. (see test/heatmap-large.html)
    // When realtime is set as true, highlight will not show when hover
    // handle, because the label on handle, which displays a exact value
    // but not range, might mislead users.


    var oldBatch = this._hoverLinkDataIndices;
    var newBatch = [];

    if (hoverOnBar || useHoverLinkOnHandle(visualMapModel)) {
      newBatch = this._hoverLinkDataIndices = visualMapModel.findTargetDataIndices(valueRange);
    }

    var resultBatches = modelUtil.compressBatches(oldBatch, newBatch);

    this._dispatchHighDown('downplay', helper.makeHighDownBatch(resultBatches[0], visualMapModel));

    this._dispatchHighDown('highlight', helper.makeHighDownBatch(resultBatches[1], visualMapModel));
  },

  /**
   * @private
   */
  _hoverLinkFromSeriesMouseOver: function (e) {
    var el = e.target;
    var visualMapModel = this.visualMapModel;

    if (!el || el.dataIndex == null) {
      return;
    }

    var dataModel = this.ecModel.getSeriesByIndex(el.seriesIndex);

    if (!visualMapModel.isTargetSeries(dataModel)) {
      return;
    }

    var data = dataModel.getData(el.dataType);
    var value = data.get(visualMapModel.getDataDimension(data), el.dataIndex, true);

    if (!isNaN(value)) {
      this._showIndicator(value, value);
    }
  },

  /**
   * @private
   */
  _hideIndicator: function () {
    var shapes = this._shapes;
    shapes.indicator && shapes.indicator.attr('invisible', true);
    shapes.indicatorLabel && shapes.indicatorLabel.attr('invisible', true);
  },

  /**
   * @private
   */
  _clearHoverLinkToSeries: function () {
    this._hideIndicator();

    var indices = this._hoverLinkDataIndices;

    this._dispatchHighDown('downplay', helper.makeHighDownBatch(indices, this.visualMapModel));

    indices.length = 0;
  },

  /**
   * @private
   */
  _clearHoverLinkFromSeries: function () {
    this._hideIndicator();

    var zr = this.api.getZr();
    zr.off('mouseover', this._hoverLinkFromSeriesMouseOver);
    zr.off('mouseout', this._hideIndicator);
  },

  /**
   * @private
   */
  _applyTransform: function (vertex, element, inverse, global) {
    var transform = graphic.getTransform(element, global ? null : this.group);
    return graphic[zrUtil.isArray(vertex) ? 'applyTransform' : 'transformDirection'](vertex, transform, inverse);
  },

  /**
   * @private
   */
  _dispatchHighDown: function (type, batch) {
    batch && batch.length && this.api.dispatchAction({
      type: type,
      batch: batch
    });
  },

  /**
   * @override
   */
  dispose: function () {
    this._clearHoverLinkFromSeries();

    this._clearHoverLinkToSeries();
  },

  /**
   * @override
   */
  remove: function () {
    this._clearHoverLinkFromSeries();

    this._clearHoverLinkToSeries();
  }
});

function createPolygon(points, cursor, onDrift, onDragEnd) {
  return new graphic.Polygon({
    shape: {
      points: points
    },
    draggable: !!onDrift,
    cursor: cursor,
    drift: onDrift,
    onmousemove: function (e) {
      // Fot mobile devicem, prevent screen slider on the button.
      eventTool.stop(e.event);
    },
    ondragend: onDragEnd
  });
}

function createHandlePoints(handleIndex, textSize) {
  return handleIndex === 0 ? [[0, 0], [textSize, 0], [textSize, -textSize]] : [[0, 0], [textSize, 0], [textSize, textSize]];
}

function createIndicatorPoints(isRange, halfHoverLinkSize, pos, extentMax) {
  return isRange ? [// indicate range
  [0, -mathMin(halfHoverLinkSize, mathMax(pos, 0))], [HOVER_LINK_OUT, 0], [0, mathMin(halfHoverLinkSize, mathMax(extentMax - pos, 0))]] : [// indicate single value
  [0, 0], [5, -5], [5, 5]];
}

function getHalfHoverLinkSize(visualMapModel, dataExtent, sizeExtent) {
  var halfHoverLinkSize = HOVER_LINK_SIZE / 2;
  var hoverLinkDataSize = visualMapModel.get('hoverLinkDataSize');

  if (hoverLinkDataSize) {
    halfHoverLinkSize = linearMap(hoverLinkDataSize, dataExtent, sizeExtent, true) / 2;
  }

  return halfHoverLinkSize;
}

function useHoverLinkOnHandle(visualMapModel) {
  var hoverLinkOnHandle = visualMapModel.get('hoverLinkOnHandle');
  return !!(hoverLinkOnHandle == null ? visualMapModel.get('realtime') : hoverLinkOnHandle);
}

function getCursor(orient) {
  return orient === 'vertical' ? 'ns-resize' : 'ew-resize';
}

export default ContinuousView;