From 87014feb0117fc5a48910253d75f1e74b7b8c688 Mon Sep 17 00:00:00 2001
From: Frederic Junod <frederic.junod@camptocamp.com>
Date: Mon, 18 Nov 2013 12:57:27 +0100
Subject: [PATCH] Use 'postcompose' event to export the map as png image

---
 examples/export-map.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/export-map.js b/examples/export-map.js
index 418ef3c461..da7d50dc3f 100644
--- a/examples/export-map.js
+++ b/examples/export-map.js
@@ -23,7 +23,11 @@ var exportPNGElement = document.getElementById('export-png');
 
 if ('download' in exportPNGElement) {
   exportPNGElement.addEventListener('click', function(e) {
-    e.target.href = map.getRenderer().getCanvas().toDataURL('image/png');
+    map.once('postcompose', function(event) {
+      var canvas = event.getContext().canvas;
+      exportPNGElement.href = canvas.toDataURL('image/png');
+    });
+    map.render();
   }, false);
 } else {
   var info = document.getElementById('no-download');