Hi Arnd. That is exactly what I need, thank You.
> May be it's possible to add a function to the Image Layer Class, that use > onload to get the image and the size. I thought maybe the usage of the ImageLayer would be very much easier with an automatic size computation with the onload function ... Best regards, Stefan. -------- Original-Nachricht -------- > Datum: Mon, 24 Oct 2011 18:17:51 +0200 > Von: "Arnd Wippermann" <[email protected]> > An: "\'\\"Stefan Jänicke\\"\'" <[email protected]> > CC: [email protected] > Betreff: Re:[OpenLayers-Users] ImageLayer for dynamically generated images > Hi, > > You can use the javascript object Image() to get the size of an image. > > Add the Image Layer to your map, perhaps with a blank image and use > something like below > to retrieve your images and replace the previous of the Image Layer. > > ... > theImg = new Image(); > theImg.onload = addImageLayer; > theImg.src = arrImages[imgCounter]; > ... > > function addImageLayer() > { > theWidth = theImg.width; > theHeight = theImg.height; > originX = 0; > originY = 0; > bounds = new OpenLayers.Bounds(originX, originY, theWidth, > theHeight); > > //map.setCenter(new OpenLayers.LonLat(theWidth/2,theHeight/2),0); > map.zoomToExtent(bounds); > > imageLayer.url=theImg.src; > imageLayer.extent=new OpenLayers.Bounds(originX, originY, theWidth, > theHeight); > imageLayer.attribution = theImg.src.replace(/^.*\/(.*)$/,"$1"); > imageLayer.setVisibility(false); > imageLayer.setVisibility(true); > $("Msg").innerHTML = "onload:" + imgCounter + ", " + theImg.src; > > } > > Example: > http://gis.ibbeck.de/ginfo/apps/OLExamples/OL210/Swap%20Image%20Url/swap_ima > ge_url.asp > > > You need not only the size of the image, you need also the insert point of > the image. Above I use 0,0. > > May be it's possible to add a function to the Image Layer Class, that use > onload to get the image and the size. > > Arnd > > > -----Ursprüngliche Nachricht----- > Von: [email protected] > [mailto:[email protected]] Im Auftrag von "Stefan > Jänicke" > Gesendet: Montag, 24. Oktober 2011 11:04 > An: remi; [email protected] > Betreff: Re: Re:[OpenLayers-Users] ImageLayer for dynamically generated > images > > Hi Remi. > > For sure, that is a possibility. But the problem is that I perform a > request > to a Contentserver2 instance, which receives the desired width and > computes > needed height of the image. I don't want to perform 2 requests (1 for > image > size, 1 for ImageLayer), since effort in Contentserver takes 1-2 seconds > per > request. > > So is there a 1-request-way with OpenLayers for me? > > Thanks, > Stefan. > > -------- Original-Nachricht -------- > > Datum: Sun, 23 Oct 2011 07:57:36 +0800 > > Von: remi <[email protected]> > > An: "",Stefan Jänicke"," <[email protected]> > > Betreff: Re:[OpenLayers-Users] ImageLayer for dynamically generated > > images > > > You can always use ur server side scripting language to get the size > > of your image. For example, in php, u can use gd extension to get the > > size of the image. > > On Oct 22, 2011 11:41 PM, ""Stefan Jänicke"" < > > [email protected]> wrote: > > -- > NEU: FreePhone - 0ct/min Handyspartarif mit Geld-zurück-Garantie! > > Jetzt informieren: http://www.gmx.net/de/go/freephone > _______________________________________________ > Users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/openlayers-users > -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ Users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/openlayers-users
