InsideZoomView.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.
*/

var zrUtil = require("zrender/lib/core/util");

var DataZoomView = require("./DataZoomView");

var sliderMove = require("../helper/sliderMove");

var roams = require("./roams");

/*
* 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.
*/
var bind = zrUtil.bind;
var InsideZoomView = DataZoomView.extend({
  type: 'dataZoom.inside',

  /**
   * @override
   */
  init: function (ecModel, api) {
    /**
     * 'throttle' is used in this.dispatchAction, so we save range
     * to avoid missing some 'pan' info.
     * @private
     * @type {Array.<number>}
     */
    this._range;
  },

  /**
   * @override
   */
  render: function (dataZoomModel, ecModel, api, payload) {
    InsideZoomView.superApply(this, 'render', arguments); // Hance the `throttle` util ensures to preserve command order,
    // here simply updating range all the time will not cause missing
    // any of the the roam change.

    this._range = dataZoomModel.getPercentRange(); // Reset controllers.

    zrUtil.each(this.getTargetCoordInfo(), function (coordInfoList, coordSysName) {
      var allCoordIds = zrUtil.map(coordInfoList, function (coordInfo) {
        return roams.generateCoordId(coordInfo.model);
      });
      zrUtil.each(coordInfoList, function (coordInfo) {
        var coordModel = coordInfo.model;
        var getRange = {};
        zrUtil.each(['pan', 'zoom', 'scrollMove'], function (eventName) {
          getRange[eventName] = bind(roamHandlers[eventName], this, coordInfo, coordSysName);
        }, this);
        roams.register(api, {
          coordId: roams.generateCoordId(coordModel),
          allCoordIds: allCoordIds,
          containsPoint: function (e, x, y) {
            return coordModel.coordinateSystem.containPoint([x, y]);
          },
          dataZoomId: dataZoomModel.id,
          dataZoomModel: dataZoomModel,
          getRange: getRange
        });
      }, this);
    }, this);
  },

  /**
   * @override
   */
  dispose: function () {
    roams.unregister(this.api, this.dataZoomModel.id);
    InsideZoomView.superApply(this, 'dispose', arguments);
    this._range = null;
  }
});
var roamHandlers = {
  /**
   * @this {module:echarts/component/dataZoom/InsideZoomView}
   */
  zoom: function (coordInfo, coordSysName, controller, e) {
    var lastRange = this._range;
    var range = lastRange.slice(); // Calculate transform by the first axis.

    var axisModel = coordInfo.axisModels[0];

    if (!axisModel) {
      return;
    }

    var directionInfo = getDirectionInfo[coordSysName](null, [e.originX, e.originY], axisModel, controller, coordInfo);
    var percentPoint = (directionInfo.signal > 0 ? directionInfo.pixelStart + directionInfo.pixelLength - directionInfo.pixel : directionInfo.pixel - directionInfo.pixelStart) / directionInfo.pixelLength * (range[1] - range[0]) + range[0];
    var scale = Math.max(1 / e.scale, 0);
    range[0] = (range[0] - percentPoint) * scale + percentPoint;
    range[1] = (range[1] - percentPoint) * scale + percentPoint; // Restrict range.

    var minMaxSpan = this.dataZoomModel.findRepresentativeAxisProxy().getMinMaxSpan();
    sliderMove(0, range, [0, 100], 0, minMaxSpan.minSpan, minMaxSpan.maxSpan);
    this._range = range;

    if (lastRange[0] !== range[0] || lastRange[1] !== range[1]) {
      return range;
    }
  },

  /**
   * @this {module:echarts/component/dataZoom/InsideZoomView}
   */
  pan: makeMover(function (range, axisModel, coordInfo, coordSysName, controller, e) {
    var directionInfo = getDirectionInfo[coordSysName]([e.oldX, e.oldY], [e.newX, e.newY], axisModel, controller, coordInfo);
    return directionInfo.signal * (range[1] - range[0]) * directionInfo.pixel / directionInfo.pixelLength;
  }),

  /**
   * @this {module:echarts/component/dataZoom/InsideZoomView}
   */
  scrollMove: makeMover(function (range, axisModel, coordInfo, coordSysName, controller, e) {
    var directionInfo = getDirectionInfo[coordSysName]([0, 0], [e.scrollDelta, e.scrollDelta], axisModel, controller, coordInfo);
    return directionInfo.signal * (range[1] - range[0]) * e.scrollDelta;
  })
};

function makeMover(getPercentDelta) {
  return function (coordInfo, coordSysName, controller, e) {
    var lastRange = this._range;
    var range = lastRange.slice(); // Calculate transform by the first axis.

    var axisModel = coordInfo.axisModels[0];

    if (!axisModel) {
      return;
    }

    var percentDelta = getPercentDelta(range, axisModel, coordInfo, coordSysName, controller, e);
    sliderMove(percentDelta, range, [0, 100], 'all');
    this._range = range;

    if (lastRange[0] !== range[0] || lastRange[1] !== range[1]) {
      return range;
    }
  };
}

var getDirectionInfo = {
  grid: function (oldPoint, newPoint, axisModel, controller, coordInfo) {
    var axis = axisModel.axis;
    var ret = {};
    var rect = coordInfo.model.coordinateSystem.getRect();
    oldPoint = oldPoint || [0, 0];

    if (axis.dim === 'x') {
      ret.pixel = newPoint[0] - oldPoint[0];
      ret.pixelLength = rect.width;
      ret.pixelStart = rect.x;
      ret.signal = axis.inverse ? 1 : -1;
    } else {
      // axis.dim === 'y'
      ret.pixel = newPoint[1] - oldPoint[1];
      ret.pixelLength = rect.height;
      ret.pixelStart = rect.y;
      ret.signal = axis.inverse ? -1 : 1;
    }

    return ret;
  },
  polar: function (oldPoint, newPoint, axisModel, controller, coordInfo) {
    var axis = axisModel.axis;
    var ret = {};
    var polar = coordInfo.model.coordinateSystem;
    var radiusExtent = polar.getRadiusAxis().getExtent();
    var angleExtent = polar.getAngleAxis().getExtent();
    oldPoint = oldPoint ? polar.pointToCoord(oldPoint) : [0, 0];
    newPoint = polar.pointToCoord(newPoint);

    if (axisModel.mainType === 'radiusAxis') {
      ret.pixel = newPoint[0] - oldPoint[0]; // ret.pixelLength = Math.abs(radiusExtent[1] - radiusExtent[0]);
      // ret.pixelStart = Math.min(radiusExtent[0], radiusExtent[1]);

      ret.pixelLength = radiusExtent[1] - radiusExtent[0];
      ret.pixelStart = radiusExtent[0];
      ret.signal = axis.inverse ? 1 : -1;
    } else {
      // 'angleAxis'
      ret.pixel = newPoint[1] - oldPoint[1]; // ret.pixelLength = Math.abs(angleExtent[1] - angleExtent[0]);
      // ret.pixelStart = Math.min(angleExtent[0], angleExtent[1]);

      ret.pixelLength = angleExtent[1] - angleExtent[0];
      ret.pixelStart = angleExtent[0];
      ret.signal = axis.inverse ? -1 : 1;
    }

    return ret;
  },
  singleAxis: function (oldPoint, newPoint, axisModel, controller, coordInfo) {
    var axis = axisModel.axis;
    var rect = coordInfo.model.coordinateSystem.getRect();
    var ret = {};
    oldPoint = oldPoint || [0, 0];

    if (axis.orient === 'horizontal') {
      ret.pixel = newPoint[0] - oldPoint[0];
      ret.pixelLength = rect.width;
      ret.pixelStart = rect.x;
      ret.signal = axis.inverse ? 1 : -1;
    } else {
      // 'vertical'
      ret.pixel = newPoint[1] - oldPoint[1];
      ret.pixelLength = rect.height;
      ret.pixelStart = rect.y;
      ret.signal = axis.inverse ? -1 : 1;
    }

    return ret;
  }
};
var _default = InsideZoomView;
module.exports = _default;