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Merge pull request #3730 from Leaflet/createtile-docs

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Document createTile async mode
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Vladimir Agafonkin 2015-08-11 12:20:37 +03:00
commit 96d33b3a15
1 changed files with 10 additions and 3 deletions
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reference.html
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@ -3373,9 +3373,10 @@ map.fitBounds(bounds);</code></pre>
<h3>Asyncronous usage example</h3>
<p>Tile creation can also be asyncronous, this is useful when using a third-party drawing library. Once the tile is finsihed drawing it can be passed to the <code>done()</code> callback.</p>
<p>Tile creation can also be asyncronous, this is useful when using a third-party drawing library. Once the tile has finished drawing it must be passed to the <code>done()</code> callback.</p>
<pre><code class="javascript">var CanvasLayer = L.GridLayer.extend({
// createTile has a 'done' parameter when on async mode
createTile: function(coords, done){
var error;
@ -3387,8 +3388,14 @@ map.fitBounds(bounds);</code></pre>
tile.width = size.x;
tile.height = size.y;
// draw something and pass the tile to the done() callback
done(error, tile);
// For this example simply wait one second before tile is ready
window.setTimeout(function(){
// draw something and pass the tile to the done() callback
done(error, tile);
}, 1000);
// return the tile so its progress can be tracked
return tile;
}
});</code></pre>