public/zh/builder/src/echarts/component/axisPointer/CartesianAxisPointer.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 BaseAxisPointer from './BaseAxisPointer';
import * as viewHelper from './viewHelper';
import * as cartesianAxisHelper from '../../coord/cartesian/cartesianAxisHelper';
import AxisView from '../axis/AxisView';
var CartesianAxisPointer = BaseAxisPointer.extend({
  /**
   * @override
   */
  makeElOption: function (elOption, value, axisModel, axisPointerModel, api) {
    var axis = axisModel.axis;
    var grid = axis.grid;
    var axisPointerType = axisPointerModel.get('type');
    var otherExtent = getCartesian(grid, axis).getOtherAxis(axis).getGlobalExtent();
    var pixelValue = axis.toGlobalCoord(axis.dataToCoord(value, true));

    if (axisPointerType && axisPointerType !== 'none') {
      var elStyle = viewHelper.buildElStyle(axisPointerModel);
      var pointerOption = pointerShapeBuilder[axisPointerType](axis, pixelValue, otherExtent);
      pointerOption.style = elStyle;
      elOption.graphicKey = pointerOption.type;
      elOption.pointer = pointerOption;
    }

    var layoutInfo = cartesianAxisHelper.layout(grid.model, axisModel);
    viewHelper.buildCartesianSingleLabelElOption(value, elOption, layoutInfo, axisModel, axisPointerModel, api);
  },

  /**
   * @override
   */
  getHandleTransform: function (value, axisModel, axisPointerModel) {
    var layoutInfo = cartesianAxisHelper.layout(axisModel.axis.grid.model, axisModel, {
      labelInside: false
    });
    layoutInfo.labelMargin = axisPointerModel.get('handle.margin');
    return {
      position: viewHelper.getTransformedPosition(axisModel.axis, value, layoutInfo),
      rotation: layoutInfo.rotation + (layoutInfo.labelDirection < 0 ? Math.PI : 0)
    };
  },

  /**
   * @override
   */
  updateHandleTransform: function (transform, delta, axisModel, axisPointerModel) {
    var axis = axisModel.axis;
    var grid = axis.grid;
    var axisExtent = axis.getGlobalExtent(true);
    var otherExtent = getCartesian(grid, axis).getOtherAxis(axis).getGlobalExtent();
    var dimIndex = axis.dim === 'x' ? 0 : 1;
    var currPosition = transform.position;
    currPosition[dimIndex] += delta[dimIndex];
    currPosition[dimIndex] = Math.min(axisExtent[1], currPosition[dimIndex]);
    currPosition[dimIndex] = Math.max(axisExtent[0], currPosition[dimIndex]);
    var cursorOtherValue = (otherExtent[1] + otherExtent[0]) / 2;
    var cursorPoint = [cursorOtherValue, cursorOtherValue];
    cursorPoint[dimIndex] = currPosition[dimIndex]; // Make tooltip do not overlap axisPointer and in the middle of the grid.

    var tooltipOptions = [{
      verticalAlign: 'middle'
    }, {
      align: 'center'
    }];
    return {
      position: currPosition,
      rotation: transform.rotation,
      cursorPoint: cursorPoint,
      tooltipOption: tooltipOptions[dimIndex]
    };
  }
});

function getCartesian(grid, axis) {
  var opt = {};
  opt[axis.dim + 'AxisIndex'] = axis.index;
  return grid.getCartesian(opt);
}

var pointerShapeBuilder = {
  line: function (axis, pixelValue, otherExtent) {
    var targetShape = viewHelper.makeLineShape([pixelValue, otherExtent[0]], [pixelValue, otherExtent[1]], getAxisDimIndex(axis));
    return {
      type: 'Line',
      subPixelOptimize: true,
      shape: targetShape
    };
  },
  shadow: function (axis, pixelValue, otherExtent) {
    var bandWidth = Math.max(1, axis.getBandWidth());
    var span = otherExtent[1] - otherExtent[0];
    return {
      type: 'Rect',
      shape: viewHelper.makeRectShape([pixelValue - bandWidth / 2, otherExtent[0]], [bandWidth, span], getAxisDimIndex(axis))
    };
  }
};

function getAxisDimIndex(axis) {
  return axis.dim === 'x' ? 0 : 1;
}

AxisView.registerAxisPointerClass('CartesianAxisPointer', CartesianAxisPointer);
export default CartesianAxisPointer;