@syncfusion/ej2-maps
Version:
The Maps component is used to visualize the geographical data and represent the statistical data of a particular geographical area on earth with user interactivity, and provides various customizing options
195 lines (191 loc) • 11.1 kB
text/typescript
import { createElement, Browser, isNullOrUndefined } from '@syncfusion/ej2-base';
import { Maps } from '../../index';
import { triggerDownload, getElementByID } from '../utils/helper';
import { ExportType } from '../utils/enum';
/**
* This module enables the export to Image functionality in maps.
*
* @hidden
*/
export class ImageExport {
/**
* Constructor for Maps
*
* @param {Maps} control - Specifies the instance of the map
*/
// eslint-disable-next-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-empty-function
constructor(control: Maps) {
}
/**
* To export the file as image/svg format
*
* @param {Maps} maps - Specifies the Maps instance.
* @param {ExportType} type - Specifies the type of the image file for exporting.
* @param {string} fileName - Specifies the file name of the image file for exporting.
* @param {boolean} allowDownload - Specifies whether to download image as a file or not.
* @returns {Promise<string>} - Specifies the base64 string of the exported image which is returned when the allowDownload is set to false.
* @private
*/
public export(maps: Maps, type: ExportType, fileName: string, allowDownload?: boolean): Promise<string> {
// eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/no-unused-vars
const promise: Promise<string> = new Promise((resolve: any, reject: any) => {
const imageCanvasElement: HTMLCanvasElement = <HTMLCanvasElement>createElement('canvas', {
id: 'ej2-canvas',
attrs: {
'width': maps.availableSize.width.toString(),
'height': maps.availableSize.height.toString()
}
});
const isDownload: boolean = !(Browser.userAgent.toString().indexOf('HeadlessChrome') > -1);
const svgParent: HTMLElement = document.getElementById(maps.element.id + '_Tile_SVG_Parent');
let svgDataElement: string;
let tileSvg: Element;
const svgObject: Element = getElementByID(maps.element.id + '_svg').cloneNode(true) as Element;
const backgroundElement: HTMLElement = svgObject.childNodes[0] as HTMLElement;
const backgroundColor: string = backgroundElement.getAttribute('fill');
if ((maps.theme === 'Tailwind' || maps.theme === 'Tailwind3' || maps.theme === 'Bootstrap5' || maps.theme === 'Fluent' || maps.theme === 'Material3' || maps.theme === 'Fluent2')
&& (backgroundColor === 'rgba(255,255,255, 0.0)' || backgroundColor === 'transparent')) {
(svgObject.childNodes[0] as HTMLElement).setAttribute('fill', 'rgba(255,255,255, 1)');
} else if ((maps.theme === 'TailwindDark' || maps.theme === 'Tailwind3Dark' || maps.theme === 'Bootstrap5Dark' || maps.theme === 'FluentDark' || maps.theme === 'Material3Dark' ||
maps.theme === 'Fluent2Dark' || maps.theme === 'Fluent2HighContrast')
&& (backgroundColor === 'rgba(255,255,255, 0.0)' || backgroundColor === 'transparent')) {
(svgObject.childNodes[0] as HTMLElement).setAttribute('fill', 'rgba(0, 0, 0, 1)');
}
if (!maps.isTileMap) {
svgDataElement = '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">' +
svgObject.outerHTML + '</svg>';
} else {
tileSvg = getElementByID(maps.element.id + '_Tile_SVG').cloneNode(true) as Element;
svgDataElement = '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">' +
svgObject.outerHTML + tileSvg.outerHTML + '</svg>';
}
const url: string = window.URL.createObjectURL(
new Blob(
type === 'SVG' ? [svgDataElement] :
[(new XMLSerializer()).serializeToString(svgObject)],
{ type: 'image/svg+xml' }
)
);
if (type === 'SVG') {
if (allowDownload) {
triggerDownload(
fileName, type,
url, isDownload
);
} else {
resolve(null);
}
} else {
const image: HTMLImageElement = new Image();
const ctxt: CanvasRenderingContext2D = imageCanvasElement.getContext('2d');
if (!maps.isTileMap) {
image.onload = (() => {
ctxt.drawImage(image, 0, 0);
window.URL.revokeObjectURL(url);
if (allowDownload) {
triggerDownload(
fileName, type, imageCanvasElement.toDataURL('image/png').replace('image/png', 'image/octet-stream'),
isDownload
);
} else {
if (type === 'PNG') {
resolve(imageCanvasElement.toDataURL('image/png'));
} else if (type === 'JPEG') {
resolve(imageCanvasElement.toDataURL('image/jpeg'));
}
}
});
image.src = url;
} else {
maps.isExportInitialTileMap = true;
const svgParentElement: HTMLElement = document.getElementById(maps.element.id + '_MapAreaBorder');
const top: number = parseFloat(svgParentElement.getAttribute('y'));
const left: number = parseFloat(svgParentElement.getAttribute('x'));
const imgxHttp: XMLHttpRequest = new XMLHttpRequest();
const imgTileLength: number = maps.mapLayerPanel.tiles.length;
for (let i: number = 0; i <= imgTileLength + 1; i++) {
const tile: HTMLElement = document.getElementById(maps.element.id + '_tile_' + (i - 1));
const exportTileImg: HTMLImageElement = new Image();
exportTileImg.crossOrigin = 'Anonymous';
const background: string = maps.background ? maps.background : ((maps.theme === 'Tailwind' || maps.theme === 'Tailwind3' || maps.theme === 'Bootstrap5' || maps.theme === 'Fluent' || maps.theme === 'Material3') && (backgroundColor === 'rgba(255,255,255, 0.0)' || backgroundColor === 'transparent')) ? '#ffffff' :
(maps.theme === 'TailwindDark' || maps.theme === 'Tailwind3Dark' || maps.theme === 'Bootstrap5Dark' || maps.theme === 'FluentDark' || maps.theme === 'Material3Dark') && (backgroundColor === 'rgba(255,255,255, 0.0)' || backgroundColor === 'transparent') ? '#000000' : '#ffffff';
ctxt.fillStyle = background;
ctxt.fillRect(0, 0, maps.availableSize.width, maps.availableSize.height);
ctxt.font = maps.titleSettings.textStyle.size + ' Arial';
const titleElement: HTMLElement = document.getElementById(maps.element.id + '_Map_title');
if (!isNullOrUndefined(titleElement)) {
ctxt.fillStyle = titleElement.getAttribute('fill');
ctxt.fillText(
maps.titleSettings.text, parseFloat(titleElement.getAttribute('x')),
parseFloat(titleElement.getAttribute('y'))
);
}
exportTileImg.onload = (() => {
if (i === 0 || i === imgTileLength + 1) {
if (i === 0) {
ctxt.setTransform(1, 0, 0, 1, 0, 0);
ctxt.rect(0, top, parseFloat(svgParent.style.width), parseFloat(svgParent.style.height));
ctxt.clip();
} else {
ctxt.setTransform(1, 0, 0, 1, left, top);
}
} else {
ctxt.setTransform(1, 0, 0, 1, parseFloat(tile.style.left) + left, parseFloat(tile.style.top) +
top);
}
ctxt.drawImage(exportTileImg, 0, 0);
if (i === imgTileLength + 1) {
localStorage.setItem('local-canvasImage', imageCanvasElement.toDataURL('image/png'));
const localBase64: string = localStorage.getItem('local-canvasImage');
if (allowDownload) {
triggerDownload(fileName, type, localBase64, isDownload);
localStorage.removeItem('local-canvasImage');
maps.isExportInitialTileMap = false;
} else {
maps.isExportInitialTileMap = false;
if (type === 'PNG') {
resolve(localBase64);
} else if (type === 'JPEG') {
resolve(imageCanvasElement.toDataURL('image/jpeg'));
}
}
}
});
if (i === 0 || i === imgTileLength + 1) {
if (i === 0) {
exportTileImg.src = url;
} else {
setTimeout(() => {
exportTileImg.src = window.URL.createObjectURL(new Blob(
[(new XMLSerializer()).serializeToString(tileSvg)],
{ type: 'image/svg+xml' }));
}, 300);
}
} else {
imgxHttp.open('GET', tile.children[0].getAttribute('src'), true);
imgxHttp.send();
exportTileImg.src = tile.children[0].getAttribute('src');
}
}
}
}
});
return promise;
}
/**
* Get module name.
*
* @returns {string} - Returns the module name
*/
protected getModuleName(): string {
return 'ImageExport';
}
/**
* To destroy the ImageExport.
*
* @returns {void}
* @private
*/
// eslint-disable-next-line @typescript-eslint/no-empty-function
public destroy(): void { }
}