Right, there are some timing associated with refreshing the screen. They are set for content that takes a fair while to draw (so it is kinder to watch a large shapefile, or slow database "draw" onto the screen as it happens).
Not sure what you would like to do? This is one of the more sensible uses for a "layer group" I have heard of ... -- Jody Garnett On Wednesday, 17 April 2013 at 4:36 PM, Juho Kokkonen wrote: > Hi Jody > > Lets say that i have two different layers. First is one geotiff file for big > scale like an europe map > and second is geotiff file on some area (like an scandinavia) smaller scale. > > i'll set zorder 0 on europe and zorder 1 on scandinavian. > > Now i'll see both of them on screen but when zoom executes it first render a > europe because it is lighter and faster to draw and > then it will render scandinavian map. > > So users see europe and after 1 second scandinavian map, so it's kind a > flicker. > > Is there any listener or something like that where i can check that all > layers has been done and then show image on screen? > > - Juho > > > ----- Original Message ----- > From: "Jody Garnett" <jody.garn...@gmail.com (mailto:jody.garn...@gmail.com)> > To: "User-friendly Desktop Internet GIS" <udig-devel@lists.refractions.net > (mailto:udig-devel@lists.refractions.net)> > Sent: Wednesday, April 17, 2013 12:47:10 AM > Subject: Re: [udig-devel] double buffering > > For raster layers: > - We use the JAI tool chain to render into an AWT BufferedImage (one buffer). > - And then transfer those bytes over to an SWT Image (second buffer). > - And then finally draw the SWT images into a buffer for the layer. > > And from there normal "composition" of the layers into a single image takes > place: > - The buffer from each layer is drawn onto an SWT image > - Any outstanding drawing commands (such as visual feedback from the tools) > is drawn > - Any thing on the glass layer is drawn > > The resulting image is the "buffer" we use to draw the control when asked by > SWT. > > > -- > Jody Garnett > > > > On Wednesday, 17 April 2013 at 6:29 AM, Juho Kokkonen wrote: > > > Hi > > I read that udig supports double buffering during render raster layers. I use > mapviewer and i'll set SWT.double_buffered flag at constructor. But how i can > use multi layer renderer on rendering my raster layers? > > - Juho > _______________________________________________ > User-friendly Desktop Internet GIS (uDig) > http://udig.refractions.net > http://lists.refractions.net/mailman/listinfo/udig-devel > > > _______________________________________________ > User-friendly Desktop Internet GIS (uDig) > http://udig.refractions.net > http://lists.refractions.net/mailman/listinfo/udig-devel > _______________________________________________ > User-friendly Desktop Internet GIS (uDig) > http://udig.refractions.net > http://lists.refractions.net/mailman/listinfo/udig-devel > >
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