public/zh/builder/src/echarts/chart/helper/Symbol.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.
*/

/**
 * @module echarts/chart/helper/Symbol
 */
import * as zrUtil from 'zrender/src/core/util';
import { createSymbol } from '../../util/symbol';
import * as graphic from '../../util/graphic';
import { parsePercent } from '../../util/number';
import { getDefaultLabel } from './labelHelper';
/**
 * @constructor
 * @alias {module:echarts/chart/helper/Symbol}
 * @param {module:echarts/data/List} data
 * @param {number} idx
 * @extends {module:zrender/graphic/Group}
 */

function SymbolClz(data, idx, seriesScope) {
  graphic.Group.call(this);
  this.updateData(data, idx, seriesScope);
}

var symbolProto = SymbolClz.prototype;
/**
 * @public
 * @static
 * @param {module:echarts/data/List} data
 * @param {number} dataIndex
 * @return {Array.<number>} [width, height]
 */

var getSymbolSize = SymbolClz.getSymbolSize = function (data, idx) {
  var symbolSize = data.getItemVisual(idx, 'symbolSize');
  return symbolSize instanceof Array ? symbolSize.slice() : [+symbolSize, +symbolSize];
};

function getScale(symbolSize) {
  return [symbolSize[0] / 2, symbolSize[1] / 2];
}

function driftSymbol(dx, dy) {
  this.parent.drift(dx, dy);
}

symbolProto._createSymbol = function (symbolType, data, idx, symbolSize, keepAspect) {
  // Remove paths created before
  this.removeAll();
  var color = data.getItemVisual(idx, 'color'); // var symbolPath = createSymbol(
  //     symbolType, -0.5, -0.5, 1, 1, color
  // );
  // If width/height are set too small (e.g., set to 1) on ios10
  // and macOS Sierra, a circle stroke become a rect, no matter what
  // the scale is set. So we set width/height as 2. See #4150.

  var symbolPath = createSymbol(symbolType, -1, -1, 2, 2, color, keepAspect);
  symbolPath.attr({
    z2: 100,
    culling: true,
    scale: getScale(symbolSize)
  }); // Rewrite drift method

  symbolPath.drift = driftSymbol;
  this._symbolType = symbolType;
  this.add(symbolPath);
};
/**
 * Stop animation
 * @param {boolean} toLastFrame
 */


symbolProto.stopSymbolAnimation = function (toLastFrame) {
  this.childAt(0).stopAnimation(toLastFrame);
};
/**
 * FIXME:
 * Caution: This method breaks the encapsulation of this module,
 * but it indeed brings convenience. So do not use the method
 * unless you detailedly know all the implements of `Symbol`,
 * especially animation.
 *
 * Get symbol path element.
 */


symbolProto.getSymbolPath = function () {
  return this.childAt(0);
};
/**
 * Get scale(aka, current symbol size).
 * Including the change caused by animation
 */


symbolProto.getScale = function () {
  return this.childAt(0).scale;
};
/**
 * Highlight symbol
 */


symbolProto.highlight = function () {
  this.childAt(0).trigger('emphasis');
};
/**
 * Downplay symbol
 */


symbolProto.downplay = function () {
  this.childAt(0).trigger('normal');
};
/**
 * @param {number} zlevel
 * @param {number} z
 */


symbolProto.setZ = function (zlevel, z) {
  var symbolPath = this.childAt(0);
  symbolPath.zlevel = zlevel;
  symbolPath.z = z;
};

symbolProto.setDraggable = function (draggable) {
  var symbolPath = this.childAt(0);
  symbolPath.draggable = draggable;
  symbolPath.cursor = draggable ? 'move' : symbolPath.cursor;
};
/**
 * Update symbol properties
 * @param {module:echarts/data/List} data
 * @param {number} idx
 * @param {Object} [seriesScope]
 * @param {Object} [seriesScope.itemStyle]
 * @param {Object} [seriesScope.hoverItemStyle]
 * @param {Object} [seriesScope.symbolRotate]
 * @param {Object} [seriesScope.symbolOffset]
 * @param {module:echarts/model/Model} [seriesScope.labelModel]
 * @param {module:echarts/model/Model} [seriesScope.hoverLabelModel]
 * @param {boolean} [seriesScope.hoverAnimation]
 * @param {Object} [seriesScope.cursorStyle]
 * @param {module:echarts/model/Model} [seriesScope.itemModel]
 * @param {string} [seriesScope.symbolInnerColor]
 * @param {Object} [seriesScope.fadeIn=false]
 */


symbolProto.updateData = function (data, idx, seriesScope) {
  this.silent = false;
  var symbolType = data.getItemVisual(idx, 'symbol') || 'circle';
  var seriesModel = data.hostModel;
  var symbolSize = getSymbolSize(data, idx);
  var isInit = symbolType !== this._symbolType;

  if (isInit) {
    var keepAspect = data.getItemVisual(idx, 'symbolKeepAspect');

    this._createSymbol(symbolType, data, idx, symbolSize, keepAspect);
  } else {
    var symbolPath = this.childAt(0);
    symbolPath.silent = false;
    graphic.updateProps(symbolPath, {
      scale: getScale(symbolSize)
    }, seriesModel, idx);
  }

  this._updateCommon(data, idx, symbolSize, seriesScope);

  if (isInit) {
    var symbolPath = this.childAt(0);
    var fadeIn = seriesScope && seriesScope.fadeIn;
    var target = {
      scale: symbolPath.scale.slice()
    };
    fadeIn && (target.style = {
      opacity: symbolPath.style.opacity
    });
    symbolPath.scale = [0, 0];
    fadeIn && (symbolPath.style.opacity = 0);
    graphic.initProps(symbolPath, target, seriesModel, idx);
  }

  this._seriesModel = seriesModel;
}; // Update common properties


var normalStyleAccessPath = ['itemStyle'];
var emphasisStyleAccessPath = ['emphasis', 'itemStyle'];
var normalLabelAccessPath = ['label'];
var emphasisLabelAccessPath = ['emphasis', 'label'];
/**
 * @param {module:echarts/data/List} data
 * @param {number} idx
 * @param {Array.<number>} symbolSize
 * @param {Object} [seriesScope]
 */

symbolProto._updateCommon = function (data, idx, symbolSize, seriesScope) {
  var symbolPath = this.childAt(0);
  var seriesModel = data.hostModel;
  var color = data.getItemVisual(idx, 'color'); // Reset style

  if (symbolPath.type !== 'image') {
    symbolPath.useStyle({
      strokeNoScale: true
    });
  }

  var itemStyle = seriesScope && seriesScope.itemStyle;
  var hoverItemStyle = seriesScope && seriesScope.hoverItemStyle;
  var symbolRotate = seriesScope && seriesScope.symbolRotate;
  var symbolOffset = seriesScope && seriesScope.symbolOffset;
  var labelModel = seriesScope && seriesScope.labelModel;
  var hoverLabelModel = seriesScope && seriesScope.hoverLabelModel;
  var hoverAnimation = seriesScope && seriesScope.hoverAnimation;
  var cursorStyle = seriesScope && seriesScope.cursorStyle;

  if (!seriesScope || data.hasItemOption) {
    var itemModel = seriesScope && seriesScope.itemModel ? seriesScope.itemModel : data.getItemModel(idx); // Color must be excluded.
    // Because symbol provide setColor individually to set fill and stroke

    itemStyle = itemModel.getModel(normalStyleAccessPath).getItemStyle(['color']);
    hoverItemStyle = itemModel.getModel(emphasisStyleAccessPath).getItemStyle();
    symbolRotate = itemModel.getShallow('symbolRotate');
    symbolOffset = itemModel.getShallow('symbolOffset');
    labelModel = itemModel.getModel(normalLabelAccessPath);
    hoverLabelModel = itemModel.getModel(emphasisLabelAccessPath);
    hoverAnimation = itemModel.getShallow('hoverAnimation');
    cursorStyle = itemModel.getShallow('cursor');
  } else {
    hoverItemStyle = zrUtil.extend({}, hoverItemStyle);
  }

  var elStyle = symbolPath.style;
  symbolPath.attr('rotation', (symbolRotate || 0) * Math.PI / 180 || 0);

  if (symbolOffset) {
    symbolPath.attr('position', [parsePercent(symbolOffset[0], symbolSize[0]), parsePercent(symbolOffset[1], symbolSize[1])]);
  }

  cursorStyle && symbolPath.attr('cursor', cursorStyle); // PENDING setColor before setStyle!!!

  symbolPath.setColor(color, seriesScope && seriesScope.symbolInnerColor);
  symbolPath.setStyle(itemStyle);
  var opacity = data.getItemVisual(idx, 'opacity');

  if (opacity != null) {
    elStyle.opacity = opacity;
  }

  var liftZ = data.getItemVisual(idx, 'liftZ');
  var z2Origin = symbolPath.__z2Origin;

  if (liftZ != null) {
    if (z2Origin == null) {
      symbolPath.__z2Origin = symbolPath.z2;
      symbolPath.z2 += liftZ;
    }
  } else if (z2Origin != null) {
    symbolPath.z2 = z2Origin;
    symbolPath.__z2Origin = null;
  }

  var useNameLabel = seriesScope && seriesScope.useNameLabel;
  graphic.setLabelStyle(elStyle, hoverItemStyle, labelModel, hoverLabelModel, {
    labelFetcher: seriesModel,
    labelDataIndex: idx,
    defaultText: getLabelDefaultText,
    isRectText: true,
    autoColor: color
  }); // Do not execute util needed.

  function getLabelDefaultText(idx, opt) {
    return useNameLabel ? data.getName(idx) : getDefaultLabel(data, idx);
  }

  symbolPath.__symbolOriginalScale = getScale(symbolSize);
  symbolPath.hoverStyle = hoverItemStyle;
  symbolPath.highDownOnUpdate = hoverAnimation && seriesModel.isAnimationEnabled() ? highDownOnUpdate : null;
  graphic.setHoverStyle(symbolPath);
};

function highDownOnUpdate(fromState, toState) {
  // Do not support this hover animation util some scenario required.
  // Animation can only be supported in hover layer when using `el.incremetal`.
  if (this.incremental || this.useHoverLayer) {
    return;
  }

  if (toState === 'emphasis') {
    var scale = this.__symbolOriginalScale;
    var ratio = scale[1] / scale[0];
    var emphasisOpt = {
      scale: [Math.max(scale[0] * 1.1, scale[0] + 3), Math.max(scale[1] * 1.1, scale[1] + 3 * ratio)]
    }; // FIXME
    // modify it after support stop specified animation.
    // toState === fromState
    //     ? (this.stopAnimation(), this.attr(emphasisOpt))

    this.animateTo(emphasisOpt, 400, 'elasticOut');
  } else if (toState === 'normal') {
    this.animateTo({
      scale: this.__symbolOriginalScale
    }, 400, 'elasticOut');
  }
}
/**
 * @param {Function} cb
 * @param {Object} [opt]
 * @param {Object} [opt.keepLabel=true]
 */


symbolProto.fadeOut = function (cb, opt) {
  var symbolPath = this.childAt(0); // Avoid mistaken hover when fading out

  this.silent = symbolPath.silent = true; // Not show text when animating

  !(opt && opt.keepLabel) && (symbolPath.style.text = null);
  graphic.updateProps(symbolPath, {
    style: {
      opacity: 0
    },
    scale: [0, 0]
  }, this._seriesModel, this.dataIndex, cb);
};

zrUtil.inherits(SymbolClz, graphic.Group);
export default SymbolClz;