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index.ts
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index.ts
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/**
* @license
* Copyright 2019 Google LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
// [START maps_overlay_hideshow]
let PRESERVE_COMMENT_ABOVE; // force tsc to maintain the comment above eslint-disable-line
// This example adds hide() and show() methods to a custom overlay's prototype.
// These methods toggle the visibility of the container <div>.
// overlay to or from the map.
function initMap(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
zoom: 11,
center: { lat: 62.323907, lng: -150.109291 },
mapTypeId: "satellite",
}
);
const bounds = new google.maps.LatLngBounds(
new google.maps.LatLng(62.281819, -150.287132),
new google.maps.LatLng(62.400471, -150.005608)
);
// The photograph is courtesy of the U.S. Geological Survey.
let image = "https://developers.google.com/maps/documentation/javascript/";
image += "examples/full/images/talkeetna.png";
// [START maps_overlay_hideshow_subclass]
/**
* The custom USGSOverlay object contains the USGS image,
* the bounds of the image, and a reference to the map.
*/
class USGSOverlay extends google.maps.OverlayView {
private bounds: google.maps.LatLngBounds;
private image: string;
private div?: HTMLElement;
constructor(bounds: google.maps.LatLngBounds, image: string) {
super();
this.bounds = bounds;
this.image = image;
}
// [END maps_overlay_hideshow_subclass]
// [START maps_overlay_hideshow_onadd]
/**
* onAdd is called when the map's panes are ready and the overlay has been
* added to the map.
*/
onAdd() {
this.div = document.createElement("div");
this.div.style.borderStyle = "none";
this.div.style.borderWidth = "0px";
this.div.style.position = "absolute";
// Create the img element and attach it to the div.
const img = document.createElement("img");
img.src = this.image;
img.style.width = "100%";
img.style.height = "100%";
img.style.position = "absolute";
this.div.appendChild(img);
// Add the element to the "overlayLayer" pane.
const panes = this.getPanes()!;
panes.overlayLayer.appendChild(this.div);
}
// [END maps_overlay_hideshow_onadd]
// [START maps_overlay_hideshow_draw]
draw() {
// We use the south-west and north-east
// coordinates of the overlay to peg it to the correct position and size.
// To do this, we need to retrieve the projection from the overlay.
const overlayProjection = this.getProjection();
// Retrieve the south-west and north-east coordinates of this overlay
// in LatLngs and convert them to pixel coordinates.
// We'll use these coordinates to resize the div.
const sw = overlayProjection.fromLatLngToDivPixel(
this.bounds.getSouthWest()
)!;
const ne = overlayProjection.fromLatLngToDivPixel(
this.bounds.getNorthEast()
)!;
// Resize the image's div to fit the indicated dimensions.
if (this.div) {
this.div.style.left = sw.x + "px";
this.div.style.top = ne.y + "px";
this.div.style.width = ne.x - sw.x + "px";
this.div.style.height = sw.y - ne.y + "px";
}
}
// [END maps_overlay_hideshow_draw]
// [START maps_overlay_hideshow_onremove]
/**
* The onRemove() method will be called automatically from the API if
* we ever set the overlay's map property to 'null'.
*/
onRemove() {
if (this.div) {
(this.div.parentNode as HTMLElement).removeChild(this.div);
delete this.div;
}
}
// [END maps_overlay_hideshow_onremove]
// [START maps_overlay_hideshow_hideshowtoggle]
/**
* Set the visibility to 'hidden' or 'visible'.
*/
hide() {
if (this.div) {
this.div.style.visibility = "hidden";
}
}
show() {
if (this.div) {
this.div.style.visibility = "visible";
}
}
toggle() {
if (this.div) {
if (this.div.style.visibility === "hidden") {
this.show();
} else {
this.hide();
}
}
}
toggleDOM(map: google.maps.Map) {
if (this.getMap()) {
this.setMap(null);
} else {
this.setMap(map);
}
}
// [END maps_overlay_hideshow_hideshowtoggle]
PRESERVE_COMMENT_ABOVE = 1; // force tsc to maintain the comment above eslint-disable-line
}
// [START maps_overlay_hideshow_init]
const overlay: USGSOverlay = new USGSOverlay(bounds, image);
overlay.setMap(map);
// [END maps_overlay_hideshow_init]
// [START maps_overlay_hideshow_controls]
const toggleButton = document.createElement("button");
toggleButton.textContent = "Toggle";
toggleButton.classList.add("custom-map-control-button");
const toggleDOMButton = document.createElement("button");
toggleDOMButton.textContent = "Toggle DOM Attachment";
toggleDOMButton.classList.add("custom-map-control-button");
toggleButton.addEventListener("click", () => {
overlay.toggle();
});
toggleDOMButton.addEventListener("click", () => {
overlay.toggleDOM(map);
});
map.controls[google.maps.ControlPosition.TOP_RIGHT].push(toggleDOMButton);
map.controls[google.maps.ControlPosition.TOP_RIGHT].push(toggleButton);
// [END maps_overlay_hideshow_controls]
}
declare global {
interface Window {
initMap: () => void;
}
}
window.initMap = initMap;
// [END maps_overlay_hideshow]
export {};