Vent-App/node_modules/echarts/lib/coord/geo/GeoSVGResource.js

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* Licensed to the Apache Software Foundation (ASF) under one
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* 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.
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/**
 * AUTO-GENERATED FILE. DO NOT MODIFY.
 */

/*
* 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 { parseSVG, makeViewBoxTransform } from 'zrender/lib/tool/parseSVG.js';
import Group from 'zrender/lib/graphic/Group.js';
import Rect from 'zrender/lib/graphic/shape/Rect.js';
import { assert, createHashMap, each } from 'zrender/lib/core/util.js';
import BoundingRect from 'zrender/lib/core/BoundingRect.js';
import { parseXML } from 'zrender/lib/tool/parseXML.js';
import { GeoSVGRegion } from './Region.js';
/**
 * "region available" means that: enable users to set attribute `name="xxx"` on those tags
 * to make it be a region.
 * 1. region styles and its label styles can be defined in echarts opton:
 * ```js
 * geo: {
 *     regions: [{
 *         name: 'xxx',
 *         itemStyle: { ... },
 *         label: { ... }
 *     }, {
 *         ...
 *     },
 *     ...]
 * };
 * ```
 * 2. name can be duplicated in different SVG tag. All of the tags with the same name share
 * a region option. For exampel if there are two <path> representing two lung lobes. They have
 * no common parents but both of them need to display label "lung" inside.
 */
var REGION_AVAILABLE_SVG_TAG_MAP = createHashMap(['rect', 'circle', 'line', 'ellipse', 'polygon', 'polyline', 'path',
// <text> <tspan> are also enabled because some SVG might paint text itself,
// but still need to trigger events or tooltip.
'text', 'tspan',
// <g> is also enabled because this case: if multiple tags share one name
// and need label displayed, every tags will display the name, which is not
// expected. So we can put them into a <g name="xxx">. Thereby only one label
// displayed and located based on the bounding rect of the <g>.
'g']);
var GeoSVGResource = /** @class */function () {
  function GeoSVGResource(mapName, svg) {
    this.type = 'geoSVG';
    // All used graphics. key: hostKey, value: root
    this._usedGraphicMap = createHashMap();
    // All unused graphics.
    this._freedGraphics = [];
    this._mapName = mapName;
    // Only perform parse to XML object here, which might be time
    // consiming for large SVG.
    // Although convert XML to zrender element is also time consiming,
    // if we do it here, the clone of zrender elements has to be
    // required. So we do it once for each geo instance, util real
    // performance issues call for optimizing it.
    this._parsedXML = parseXML(svg);
  }
  GeoSVGResource.prototype.load = function /* nameMap: NameMap */
  () {
    // In the "load" stage, graphic need to be built to
    // get boundingRect for geo coordinate system.
    var firstGraphic = this._firstGraphic;
    // Create the return data structure only when first graphic created.
    // Because they will be used in geo coordinate system update stage,
    // and `regions` will be mounted at `geo` coordinate system,
    // in which there is no "view" info, so that it should better not to
    // make references to graphic elements.
    if (!firstGraphic) {
      firstGraphic = this._firstGraphic = this._buildGraphic(this._parsedXML);
      this._freedGraphics.push(firstGraphic);
      this._boundingRect = this._firstGraphic.boundingRect.clone();
      // PENDING: `nameMap` will not be supported until some real requirement come.
      // if (nameMap) {
      //     named = applyNameMap(named, nameMap);
      // }
      var _a = createRegions(firstGraphic.named),
        regions = _a.regions,
        regionsMap = _a.regionsMap;
      this._regions = regions;
      this._regionsMap = regionsMap;
    }
    return {
      boundingRect: this._boundingRect,
      regions: this._regions,
      regionsMap: this._regionsMap
    };
  };
  GeoSVGResource.prototype._buildGraphic = function (svgXML) {
    var result;
    var rootFromParse;
    try {
      result = svgXML && parseSVG(svgXML, {
        ignoreViewBox: true,
        ignoreRootClip: true
      }) || {};
      rootFromParse = result.root;
      assert(rootFromParse != null);
    } catch (e) {
      throw new Error('Invalid svg format\n' + e.message);
    }
    // Note: we keep the covenant that the root has no transform. So always add an extra root.
    var root = new Group();
    root.add(rootFromParse);
    root.isGeoSVGGraphicRoot = true;
    // [THE_RULE_OF_VIEWPORT_AND_VIEWBOX]
    //
    // Consider: `<svg width="..." height="..." viewBox="...">`
    // - the `width/height` we call it `svgWidth/svgHeight` for short.
    // - `(0, 0, svgWidth, svgHeight)` defines the viewport of the SVG, or say,
    //   "viewport boundingRect", or `boundingRect` for short.
    // - `viewBox` defines the transform from the real content ot the viewport.
    //   `viewBox` has the same unit as the content of SVG.
    //   If `viewBox` exists, a transform is defined, so the unit of `svgWidth/svgHeight` become
    //   different from the content of SVG. Otherwise, they are the same.
    //
    // If both `svgWidth/svgHeight/viewBox` are specified in a SVG file, the transform rule will be:
    // 0. `boundingRect` is `(0, 0, svgWidth, svgHeight)`. Set it to Geo['_rect'] (View['_rect']).
    // 1. Make a transform from `viewBox` to `boundingRect`.
    //    Note: only support `preserveAspectRatio 'xMidYMid'` here. That is, this transform will preserve
    //    the aspect ratio.
    // 2. Make a transform from boundingRect to Geo['_viewRect'] (View['_viewRect'])
    //    (`Geo`/`View` will do this job).
    //    Note: this transform might not preserve aspect radio, which depending on how users specify
    //    viewRect in echarts option (e.g., `geo.left/top/width/height` will not preserve aspect ratio,
    //    but `geo.layoutCenter/layoutSize` will preserve aspect ratio).
    //
    // If `svgWidth/svgHeight` not specified, we use `viewBox` as the `boundingRect` to make the SVG
    // layout look good.
    //
    // If neither `svgWidth/svgHeight` nor `viewBox` are not specified, we calculate the boundingRect
    // of the SVG content and use them to make SVG layout look good.
    var svgWidth = result.width;
    var svgHeight = result.height;
    var viewBoxRect = result.viewBoxRect;
    var boundingRect = this._boundingRect;
    if (!boundingRect) {
      var bRectX = void 0;
      var bRectY = void 0;
      var bRectWidth = void 0;
      var bRectHeight = void 0;
      if (svgWidth != null) {
        bRectX = 0;
        bRectWidth = svgWidth;
      } else if (viewBoxRect) {
        bRectX = viewBoxRect.x;
        bRectWidth = viewBoxRect.width;
      }
      if (svgHeight != null) {
        bRectY = 0;
        bRectHeight = svgHeight;
      } else if (viewBoxRect) {
        bRectY = viewBoxRect.y;
        bRectHeight = viewBoxRect.height;
      }
      // If both viewBox and svgWidth/svgHeight not specified,
      // we have to determine how to layout those element to make them look good.
      if (bRectX == null || bRectY == null) {
        var calculatedBoundingRect = rootFromParse.getBoundingRect();
        if (bRectX == null) {
          bRectX = calculatedBoundingRect.x;
          bRectWidth = calculatedBoundingRect.width;
        }
        if (bRectY == null) {
          bRectY = calculatedBoundingRect.y;
          bRectHeight = calculatedBoundingRect.height;
        }
      }
      boundingRect = this._boundingRect = new BoundingRect(bRectX, bRectY, bRectWidth, bRectHeight);
    }
    if (viewBoxRect) {
      var viewBoxTransform = makeViewBoxTransform(viewBoxRect, boundingRect);
      // Only support `preserveAspectRatio 'xMidYMid'`
      rootFromParse.scaleX = rootFromParse.scaleY = viewBoxTransform.scale;
      rootFromParse.x = viewBoxTransform.x;
      rootFromParse.y = viewBoxTransform.y;
    }
    // SVG needs to clip based on `viewBox`. And some SVG files really rely on this feature.
    // They do not strictly confine all of the content inside a display rect, but deliberately
    // use a `viewBox` to define a displayable rect.
    // PENDING:
    // The drawback of the `setClipPath` here is: the region label (genereted by echarts) near the
    // edge might also be clipped, because region labels are put as `textContent` of the SVG path.
    root.setClipPath(new Rect({
      shape: boundingRect.plain()
    }));
    var named = [];
    each(result.named, function (namedItem) {
      if (REGION_AVAILABLE_SVG_TAG_MAP.get(namedItem.svgNodeTagLower) != null) {
        named.push(namedItem);
        setSilent(namedItem.el);
      }
    });
    return {
      root: root,
      boundingRect: boundingRect,
      named: named
    };
  };
  /**
   * Consider:
   * (1) One graphic element can not be shared by different `geoView` running simultaneously.
   *     Notice, also need to consider multiple echarts instances share a `mapRecord`.
   * (2) Converting SVG to graphic elements is time consuming.
   * (3) In the current architecture, `load` should be called frequently to get boundingRect,
   *     and it is called without view info.
   * So we maintain graphic elements in this module, and enables `view` to use/return these
   * graphics from/to the pool with it's uid.
   */
  GeoSVGResource.prototype.useGraphic = function (hostKey /* , nameMap: NameMap */) {
    var usedRootMap = this._usedGraphicMap;
    var svgGraphic = usedRootMap.get(hostKey);
    if (svgGraphic) {
      return svgGraphic;
    }
    svgGraphic = this._freedGraphics.pop()
    // use the first boundingRect to avoid duplicated boundingRect calculation.
    || this._buildGraphic(this._parsedXML);
    usedRootMap.set(hostKey, svgGraphic);
    // PENDING: `nameMap` will not be supported until some real requirement come.
    // `nameMap` can only be obtained from echarts option.
    // The original `named` must not be modified.
    // if (nameMap) {
    //     svgGraphic = extend({}, svgGraphic);
    //     svgGraphic.named = applyNameMap(svgGraphic.named, nameMap);
    // }
    return svgGraphic;
  };
  GeoSVGResource.prototype.freeGraphic = function (hostKey) {
    var usedRootMap = this._usedGraphicMap;
    var svgGraphic = usedRootMap.get(hostKey);
    if (svgGraphic) {
      usedRootMap.removeKey(hostKey);
      this._freedGraphics.push(svgGraphic);
    }
  };
  return GeoSVGResource;
}();
export { GeoSVGResource };
function setSilent(el) {
  // Only named element has silent: false, other elements should
  // act as background and has no user interaction.
  el.silent = false;
  // text|tspan will be converted to group.
  if (el.isGroup) {
    el.traverse(function (child) {
      child.silent = false;
    });
  }
}
function createRegions(named) {
  var regions = [];
  var regionsMap = createHashMap();
  // Create resions only for the first graphic.
  each(named, function (namedItem) {
    // Region has feature to calculate center for tooltip or other features.
    // If there is a <g name="xxx">, the center should be the center of the
    // bounding rect of the g.
    if (namedItem.namedFrom != null) {
      return;
    }
    var region = new GeoSVGRegion(namedItem.name, namedItem.el);
    // PENDING: if `nameMap` supported, this region can not be mounted on
    // `this`, but can only be created each time `load()` called.
    regions.push(region);
    // PENDING: if multiple tag named with the same name, only one will be
    // found by `_regionsMap`. `_regionsMap` is used to find a coordinate
    // by name. We use `region.getCenter()` as the coordinate.
    regionsMap.set(namedItem.name, region);
  });
  return {
    regions: regions,
    regionsMap: regionsMap
  };
}
// PENDING: `nameMap` will not be supported until some real requirement come.
// /**
//  * Use the alias in geoNameMap.
//  * The input `named` must not be modified.
//  */
// function applyNameMap(
//     named: GeoSVGGraphicRecord['named'],
//     nameMap: NameMap
// ): GeoSVGGraphicRecord['named'] {
//     const result = [] as GeoSVGGraphicRecord['named'];
//     for (let i = 0; i < named.length; i++) {
//         let regionGraphic = named[i];
//         const name = regionGraphic.name;
//         if (nameMap && nameMap.hasOwnProperty(name)) {
//             regionGraphic = extend({}, regionGraphic);
//             regionGraphic.name = name;
//         }
//         result.push(regionGraphic);
//     }
//     return result;
// }