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Newsgroups: comp.lang.java.programmer
Date: Tue, 11 Dec 2012 09:15:24 -0800 (PST)
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Subject: Re: JAVAFX Rendering
From: nataraja gadikota <nataraja.3.833@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:20254

Thanks Jim , 
       that's a new idea 
I'll try to work it out !

On Monday, December 10, 2012 11:19:51 PM UTC+5:30, Jim Gibson wrote:
> In article <7cd27ea6-eea8-4b71-bfe5-9a1898b55c73@googlegroups.com>,
> 
> nataraja gadikota <nataraja.3.833@gmail.com> wrote:
> 
> 
> 
> > Hi , 
> 
> >     I'm looking for a Java based solution for my canvas problem
> 
> > TCL/TK is not able to handle 3million rectangles on a canvas !
> 
> >  
> 
> > https://groups.google.com/forum/?fromgroups=#!topic/comp.lang.tcl/Dxh4KyOOojY 
> 
> > 
> 
> > " 
> 
> > Today I had to visualize a huge Data Structure with 146k nodes 
> 
> > and each node is a set of polys/rectangles >20 
> 
> > 
> 
> > I've drawn everything on a Canvas , Appximately 3 million objects were
> 
> > created 
> 
> > All my operations Zoom , Scrolling , Moving Objects on this Canvas have
> 
> > become very SLOW 
> 
> > 
> 
> > I've tested the code with 100 nodes , everything is working fine at that
> 
> > level 
> 
> > When I increase the DS , I'm looking at these issues . 
> 
> > 
> 
> > Any suggestions previous experiences on how to improve the speed ? 
> 
> 
> 
> Sounds like you should consider clipping
> 
> (<http://en.wikipedia.org/wiki/Clipping_(computer_graphics)>) when you
> 
> have zoomed in and showing low-resolution versions of groups of nodes
> 
> (if your data consists of node groups in a tree-like structure) when
> 
> you are zoomed out (I don't remember the word for this; "greeking" is a
> 
> term applied to showing fuzzy blobs for text when the characters are
> 
> too small to see clearly).
> 
> 
> 
> In other words: don't draw all 3 million nodes, just the ones that
> 
> would be visible on the screen. If a group of nodes is too small to be
> 
> seen in detail, substitute a low-resolution graphic for the group.
> 
> 
> 
> -- 
> 
> Jim Gibson