goog.require('ol.Map');
goog.require('ol.RendererHint');
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()
    })
  ],
  renderer: ol.RendererHint.CANVAS,
  target: 'map',
  view: new ol.View2D({
    center: [0, 0],
    zoom: 2
  })
});

var exportJPEGElement = document.getElementById('export-jpeg');
var exportPNGElement = document.getElementById('export-png');

if ('download' in exportJPEGElement && 'download' in exportPNGElement) {
  exportJPEGElement.addEventListener('click', function(e) {
    e.target.href = map.getRenderer().getCanvas().toDataURL('image/jpeg');
  }, false);

  exportPNGElement.addEventListener('click', function(e) {
    e.target.href = map.getRenderer().getCanvas().toDataURL('image/png');
  }, false);
} else {
  var info = document.getElementById('no-download');
  /**
   * display error message
   */
  info.style.display = '';
}