[OpenLayers-Trac] Re: [OpenLayers] #2935: measure control should be able to calculate immediately while mouse is moving

[OpenLayers]

#2935: measure control should be able to calculate immediately while mouse is
moving
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 Reporter:  patzi            |       Owner:  tschaub     
     Type:  feature          |      Status:  new         
 Priority:  minor            |   Milestone:  2.11 Release
Component:  Control.Measure  |     Version:  2.10        
 Keywords:                   |       State:              
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Comment(by patzi):

 Replying to [comment:4 ahocevar]:
 I added a new patch including tests
 > A few things:
 >  * Cloning the geometry is relatively expensive, and not needed here. It
 was added for measurepartial to make sure you get the correct measurement
 even if you move the mouse very fast and the geometry has changed after
 "measurepartial" but before you use the measurement result.
 fixed.
 >  * You should register the modify callback only if the control was
 configured with {{{immediate}}} set to {{{true}}}, because even calling a
 callback that does nothing causes an overhead while moving the mouse.
 fixed
 >  * To avoid two "measurepartial" events being fired in freehand mode, It
 would be cheaper to check for {{{immediate}}} in measurePartial than to
 check for freehand mode in measureImmediate.
 fixed
 >  * I think this patch would break what was fixed with r10799. So you
 have to make sure that measureImmediate only causes a "measurepartial"
 event to be fired when {{{delayedTrigger}}} is null.
 I think this should not happen, but I must consist that I do not
 completely understand when this error could arise.

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Ticket URL: <http://trac.openlayers.org/ticket/2935#comment:6>
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