[OpenLayers-Users] Canvas issue when using externalGraphic

[Xavier Mamano (jorix)]

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.