37 lines
780 B
JavaScript
37 lines
780 B
JavaScript
goog.require('ol.Map');
|
|
goog.require('ol.View2D');
|
|
goog.require('ol.layer.Tile');
|
|
goog.require('ol.source.OSM');
|
|
|
|
|
|
var map = new ol.Map({
|
|
layers: [
|
|
new ol.layer.Tile({
|
|
source: new ol.source.OSM()
|
|
})
|
|
],
|
|
target: 'map',
|
|
view: new ol.View2D({
|
|
center: [0, 0],
|
|
zoom: 2
|
|
})
|
|
});
|
|
|
|
var exportPNGElement = document.getElementById('export-png');
|
|
|
|
if ('download' in exportPNGElement) {
|
|
exportPNGElement.addEventListener('click', function(e) {
|
|
map.once('postcompose', function(event) {
|
|
var canvas = event.context.canvas;
|
|
exportPNGElement.href = canvas.toDataURL('image/png');
|
|
});
|
|
map.render();
|
|
}, false);
|
|
} else {
|
|
var info = document.getElementById('no-download');
|
|
/**
|
|
* display error message
|
|
*/
|
|
info.style.display = '';
|
|
}
|