Eric Lemoine <[email protected]> wrote ..
> On Thursday, August 12, 2010, DevHour <[email protected]> wrote:
> > Currently I am trying to export maps to a canvas element by using the
> > example
> posted at
> http://trac.openlayers.org/browser/sandbox/camptocamp/canvas/openlayers/examples/exportMapCanvas.html
> by tsauerwein. So far i've grabbed that html file and the exportMap.js file.
> The
> issue i'm having is that it won't export the WMS layers, although it will
> export
> vector layers.
> >
> > I've gone through and tried to debug the script (using Firebug) and this is
> > the
> part where its failing:
> >
> > ExportMap.js - line 128 through 136
> > exportGridLayer: function(layer) {
> > if (layer.useCanvas != OpenLayers.Layer.Grid.ONECANVASPERLAYER) {
> > return;
> > }
> >
> > if (layer.canvas != null) {
> > this.drawLayer(layer.canvas);
> > }
> > },
> >
> > Now it is passing the layer correctly into the function but layer.useCanvas
> > is
> undefined. So it'll automatically pass over that first if statement, and also
> layer.canvas
> is also undefined there so it'll pass over the next if statement as well.
> Meaning
> that the layer won't get passed through to the draw canvas. Like I said it
> works
> for vectors, just not the others. Is there any reason why these 2 properties
> (useCanvas
> and canvas) are both undefined? am I missing a reference to something?
> >
> > Any help I get will be greatly appreciated!
>
>
> This sandbox also includes code for displaying tiles using canvas. And
> it looks like only WMS layers that use canvas with the
> ONECANVASPERLAYER mode can be exported.
>
>
> Hope it helps,
>
> --
> Eric Lemoine
>
> Camptocamp France SAS
> Savoie Technolac, BP 352
> 73377 Le Bourget du Lac, Cedex
>
> Tel : 00 33 4 79 44 44 96
> Mail : [email protected]
> http://www.camptocamp.com
>
Well currently i'm strictly using the code that was provided, including the
html file. The WMS base layer that is provided looks like so;
var wmsBase = new OpenLayers.Layer.WMS("OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0?";,
// "proxy.cgi?url=http://labs.metacarta.com/wms/vmap0?";,
{
layers: 'basic'
},
{
useCanvas: OpenLayers.Layer.Grid.ONECANVASPERLAYER
});
As you can see useCanvas is defined and set to ONECANVASPERLAYER. This is one
of the reasons why i'm stuck, before useCanvas is defined yet still showing as
undefined.
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