[OpenLayers-Users] Canvas issue when using externalGraphic

[Alexandre Dubé]

Xavier,

   You're right.  Thanks for sharing your solutions.  I think using your 
workaround (locking the renderer on unselectAll) combined with a 
tolerance of 0 could do the trick for me, but it would still be nice to 
nail the cause of the issue.

   I'll update my example.

Thanks again,

Alexandre


On 13-08-09 04:46 PM, Xavier Mamano (jorix) wrote:
> Hi
>
> But the problem remains when the clickout has a little drag before (less
> than 4 pixels --see clickTolerance on OpenLayers.Handler.Feature--)
>
> Try select the features, and unselect by: mousedown + mousemove (less than 4
> pixels) + mouseup. Oops!
>
> Seems that "this.canvas.clearRect (0, 0, width, height);" on Canvas.redraw
> does not act a second time while the js code is still running.
>
> Xavier
>
>
> Xavier Mamano (jorix) wrote
>> Hi,
>>
>>
>> I tried your workaround...
>>
>> It works on Chrome but not on FF.
>>
>> And tried this:
>>              select.unselectAll = function(options) {
>>                  vectors.renderer.locked = true;
>>                 
>> OpenLayers.Control.SelectFeature.prototype.unselectAll.apply(
>>                                            this, arguments);
>>                  vectors.renderer.locked = false;
>>                  vectors.moveTo(null, true, false); // to force a
>> vectors.redraw();
>>              };
>>
>> It works on FF & Chrome.
>>
>> Xavier
>> Alexandre Dubé wrote
>>> Hi,
>>>
>>>     Here's a pretty dirty workaround:
>>> http://dev5.mapgears.com/openlayers/2.12-canvas-issue/examples/canvas-issue-workaround.html?renderer=Canvas
>>>
>>>     In summary, I redraw the layer after features were unselected.
>>>
>>>     I'm still not sure what's the cause of the issue, but I noticed that
>>> when calling the unselectAll method of the select control, each feature
>>> are drawn (using layer.drawFeature method) separately, resulting in
>>> redrawing the layer X times for each feature that were unselected.
>>> Maybe if the renderer was locked while unselecting all these it could do
>>> the trick.
>>>
>>>     Please, let me know if this should deserve an Issue opened.
>>>
>>> Alexandre
>>>
>>>
>>> On 13-08-07 01:14 PM, Alexandre Dubé wrote:
>>>> Thanks to everyone who tried the example.  I'll try to can come up
>>>> with a fix or a workaround asap.
>>>>
>>>> Alexandre
>>>>
>>>>
>>>> On 13-08-07 11:02 AM, Xavier Mamano (jorix) wrote:
>>>>> Hi,
>>>>>
>>>>> I can confirm seeing this using Windows Vista on Chrome, FF, IE9 and
>>>>> Opera
>>>>> and olso usign Ubuntu on Chome and FF.
>>>>>
>>>>> (using your canvas-issue.html)
>>>>>
>>>>> Xavier Mamano
>>>>>
>>>>>
>>>>> Alexandre Dubé wrote
>>>>>> Hi,
>>>>>>
>>>>>>      I have an issue when I use Canvas as vector renderer in addition
>>>>>> to
>>>>>> having externalGraphic properties.  I noticed the issue using
>>>>>> OpenLayers
>>>>>> 2.12, 2.13 and 2.13.1, with the 3 browsers I tested: Chrome, Firefox
>>>>>> and
>>>>>> IE9.
>>>>>>
>>>>>>      I made a small demo to show the issue 'live':
>>>>>> http://dev5.mapgears.com/openlayers/2.12-canvas-issue/examples/canvas-issue.html?renderer=Canvas
>>>>>>
>>>>>>
>>>>>>      Before trying to look deeper at the code to see what's going on
>>>>>> wrong, I wonder if anyone already hit this same issue and came up
>>>>>> with a
>>>>>> fix / solution / workaround.
>>>>>>
>>>>>> Many thanks,
>>>>>>
>>>>>> Alexandre
>>>>>>
>>>>>> P.S. The example's html file can be downloaded and added to any local
>>>>>> examples folder in order to test it locally with different versions of
>>>>>> OpenLayers, i.e. the images and externalGraphic links are absolute,
>>>>>> not
>>>>>> relative.
>>>>>>
>>>>>> -- 
>>>>>> Alexandre Dubé
>>>>>> Mapgears
>>>>>> www.mapgears.com
>>>>>>
>>>>>> _______________________________________________
>>>>>> Users mailing list
>>>>>> Users at .osgeo
>>>>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>>>>
>>>>>
>>>>>
>>>>> -- 
>>>>> View this message in context:
>>>>> http://osgeo-org.1560.x6.nabble.com/Canvas-issue-when-using-externalGraphic-tp5071099p5071319.html
>>>>> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>>>>> _______________________________________________
>>>>> Users mailing list
>>>>>
>>> Users at .osgeo
>>>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>>>
>>>
>>> -- 
>>> Alexandre Dubé
>>> Mapgears
>>> www.mapgears.com
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at .osgeo
>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>
>
>
>
> --
> View this message in context: http://osgeo-org.1560.x6.nabble.com/Canvas-issue-when-using-externalGraphic-tp5071099p5071801.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
> _______________________________________________
> Users mailing list
> Users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/openlayers-users


-- 
Alexandre Dubé
Mapgears
www.mapgears.com