jtBaseApp/node_modules/@cesium/widgets/Source/ProjectionPicker/ProjectionPicker.js

import {
  defined,
  destroyObject,
  DeveloperError,
  FeatureDetection,
  getElement,
} from "@cesium/engine";
import knockout from "../ThirdParty/knockout.js";
import ProjectionPickerViewModel from "./ProjectionPickerViewModel.js";

const perspectivePath =
  "M 28.15625,10.4375 9.125,13.21875 13.75,43.25 41.75,55.09375 50.8125,37 54.5,11.9375 z m 0.125,3 19.976451,0.394265 L 43.03125,16.875 22.6875,14.28125 z M 50.971746,15.705477 47.90625,36.03125 42.53125,46 44.84375,19.3125 z M 12.625,16.03125 l 29.15625,3.6875 -2.65625,31 L 16.4375,41.125 z";
const orthographicPath =
  "m 31.560594,6.5254438 -20.75,12.4687502 0.1875,24.5625 22.28125,11.8125 19.5,-12 0.65625,-0.375 0,-0.75 0.0312,-23.21875 z m 0.0625,3.125 16.65625,9.5000002 -16.125,10.28125 -17.34375,-9.71875 z m 18.96875,11.1875002 0.15625,20.65625 -17.46875,10.59375 0.15625,-20.28125 z m -37.0625,1.25 17.21875,9.625 -0.15625,19.21875 -16.9375,-9 z";

/**
 * The ProjectionPicker is a single button widget for switching between perspective and orthographic projections.
 *
 * @alias ProjectionPicker
 * @constructor
 *
 * @param {Element|string} container The DOM element or ID that will contain the widget.
 * @param {Scene} scene The Scene instance to use.
 *
 * @exception {DeveloperError} Element with id "container" does not exist in the document.
 *
 * @example
 * // In HTML head, include a link to the ProjectionPicker.css stylesheet,
 * // and in the body, include: <div id="projectionPickerContainer"></div>
 * // Note: This code assumes you already have a Scene instance.
 *
 * const projectionPicker = new Cesium.ProjectionPicker('projectionPickerContainer', scene);
 */
function ProjectionPicker(container, scene) {
  //>>includeStart('debug', pragmas.debug);
  if (!defined(container)) {
    throw new DeveloperError("container is required.");
  }
  if (!defined(scene)) {
    throw new DeveloperError("scene is required.");
  }
  //>>includeEnd('debug');

  container = getElement(container);

  const viewModel = new ProjectionPickerViewModel(scene);

  viewModel._perspectivePath = perspectivePath;
  viewModel._orthographicPath = orthographicPath;

  const wrapper = document.createElement("span");
  wrapper.className = "cesium-projectionPicker-wrapper cesium-toolbar-button";
  container.appendChild(wrapper);

  const button = document.createElement("button");
  button.type = "button";
  button.className = "cesium-button cesium-toolbar-button";
  button.setAttribute(
    "data-bind",
    '\
css: { "cesium-projectionPicker-buttonPerspective": !_orthographic,\
       "cesium-projectionPicker-buttonOrthographic": _orthographic,\
       "cesium-button-disabled" : sceneMode === _sceneMode.SCENE2D || _flightInProgress, \
       "cesium-projectionPicker-selected": dropDownVisible },\
attr: { title: selectedTooltip },\
click: toggleDropDown'
  );
  button.innerHTML =
    '\
<!-- ko cesiumSvgPath: { path: _perspectivePath, width: 64, height: 64, css: "cesium-projectionPicker-iconPerspective" } --><!-- /ko -->\
<!-- ko cesiumSvgPath: { path: _orthographicPath, width: 64, height: 64, css: "cesium-projectionPicker-iconOrthographic" } --><!-- /ko -->';
  wrapper.appendChild(button);

  const perspectiveButton = document.createElement("button");
  perspectiveButton.type = "button";
  perspectiveButton.className =
    "cesium-button cesium-toolbar-button cesium-projectionPicker-dropDown-icon";
  perspectiveButton.setAttribute(
    "data-bind",
    '\
css: { "cesium-projectionPicker-visible" : (dropDownVisible && _orthographic),\
       "cesium-projectionPicker-none" : !_orthographic,\
       "cesium-projectionPicker-hidden" : !dropDownVisible },\
attr: { title: tooltipPerspective },\
click: switchToPerspective,\
cesiumSvgPath: { path: _perspectivePath, width: 64, height: 64 }'
  );
  wrapper.appendChild(perspectiveButton);

  const orthographicButton = document.createElement("button");
  orthographicButton.type = "button";
  orthographicButton.className =
    "cesium-button cesium-toolbar-button cesium-projectionPicker-dropDown-icon";
  orthographicButton.setAttribute(
    "data-bind",
    '\
css: { "cesium-projectionPicker-visible" : (dropDownVisible && !_orthographic),\
       "cesium-projectionPicker-none" : _orthographic,\
       "cesium-projectionPicker-hidden" : !dropDownVisible},\
attr: { title: tooltipOrthographic },\
click: switchToOrthographic,\
cesiumSvgPath: { path: _orthographicPath, width: 64, height: 64 }'
  );
  wrapper.appendChild(orthographicButton);

  knockout.applyBindings(viewModel, wrapper);

  this._viewModel = viewModel;
  this._container = container;
  this._wrapper = wrapper;

  this._closeDropDown = function (e) {
    if (!wrapper.contains(e.target)) {
      viewModel.dropDownVisible = false;
    }
  };
  if (FeatureDetection.supportsPointerEvents()) {
    document.addEventListener("pointerdown", this._closeDropDown, true);
  } else {
    document.addEventListener("mousedown", this._closeDropDown, true);
    document.addEventListener("touchstart", this._closeDropDown, true);
  }
}

Object.defineProperties(ProjectionPicker.prototype, {
  /**
   * Gets the parent container.
   * @memberof ProjectionPicker.prototype
   *
   * @type {Element}
   */
  container: {
    get: function () {
      return this._container;
    },
  },

  /**
   * Gets the view model.
   * @memberof ProjectionPicker.prototype
   *
   * @type {ProjectionPickerViewModel}
   */
  viewModel: {
    get: function () {
      return this._viewModel;
    },
  },
});

/**
 * @returns {boolean} true if the object has been destroyed, false otherwise.
 */
ProjectionPicker.prototype.isDestroyed = function () {
  return false;
};

/**
 * Destroys the widget.  Should be called if permanently
 * removing the widget from layout.
 */
ProjectionPicker.prototype.destroy = function () {
  this._viewModel.destroy();

  if (FeatureDetection.supportsPointerEvents()) {
    document.removeEventListener("pointerdown", this._closeDropDown, true);
  } else {
    document.removeEventListener("mousedown", this._closeDropDown, true);
    document.removeEventListener("touchstart", this._closeDropDown, true);
  }

  knockout.cleanNode(this._wrapper);
  this._container.removeChild(this._wrapper);

  return destroyObject(this);
};
export default ProjectionPicker;