Okay I get it ... What uDig does is add a render callback; and every 100 or so draw callbacks is asks its UI thread to draw the image to the screen again. It is actually a bit more complicated in that we have a timer that will draw after 1,3,5, 5, 5 seconds; and the renderer is used to set a flag - and if the timer sees the flag it will redraw the image onto the screen.
But when it actualy draws it does a simple gc.drawImage ... Jody On 11/05/2010, at 5:25 PM, LSA wrote: > Hi Jody, > > >> - Draw the image as geotools is drawing into it... this is what uDig does. > > Can you please supply me with a code sample regarding how uDig does that? We > really need this feature, our customers dislike the time lag (datasets are > large). > > Thanks, > Sergey > > On 5/6/2010 11:03 PM, Jody Garnett wrote: >> >> Yes; a couple of ways. >> - Draw the image as geotools is drawing into it... this is what uDig does. >> - Get a volatile image and use that to draw into. It is tricky Java 2D >> programming (because you need to redraw if windows are moved in front of >> your image) but it is effective. >> >> Jody >> >> On 07/05/2010, at 12:26 AM, LSA wrote: >> >> >>> As far as I know, default geotools drawing mode is to draw on offline >>> buffer and then render this buffer to the screen. On the opposing side, >>> OpenJump (for example) draws everythink it can draw immediately. >>> This give user the feeling of more responsive interface, because hey - >>> something is going on my screen. So if one will draw streets dataset >>> he/she will notice how streets are being rendered one by one. >>> >>> Is it possible to do something similar for the geotools, I mean to draw >>> every feature obtained for drawing immediately to user, not to offscreen >>> buffer? >>> >>> Thanks in advance! >>> >>> ------------------------------------------------------------------------------ >>> _______________________________________________ >>> Geotools-gt2-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >>> >> >
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