html2canvas does not work with Google Maps Pan

Question

I\'m using html2canvas to save my online map as an image (See the Save as Image link). I\'ve tried it in Firefox, Chrome and Opera.

It tends to work more often if

Answer 1

Apparently, the problem seems to stem from html2canvas not being able to render css transforms, at least in chrome (I could only reproduce the problem in chrome, on OSX). The container that holds the tiles, is translated using -webkit-transform. So what we could do is to grab the values that the container is shifted, remove the transform, assign left and top from the values we got off transform then use html2canvas. Then so the map doesn't break, we reset the map's css values when html2canvas is done.

So I pasted this into the javascript console at your site and at it seemed to work

//get transform value
var transform=$(".gm-style>div:first>div").css("transform")
var comp=transform.split(",") //split up the transform matrix
var mapleft=parseFloat(comp[4]) //get left value
var maptop=parseFloat(comp[5])  //get top value
$(".gm-style>div:first>div").css({ //get the map container. not sure if stable
  "transform":"none",
  "left":mapleft,
  "top":maptop,
})
html2canvas($('#map-canvas'),
{
  useCORS: true,
  onrendered: function(canvas)
  {
    var dataUrl= canvas.toDataURL('image/png');
    location.href=dataUrl //for testing I never get window.open to work
    $(".gm-style>div:first>div").css({
      left:0,
      top:0,
      "transform":transform
    })
  }
});