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From: Jim Gibson <jimsgibson@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: JAVAFX Rendering
Date: Mon, 10 Dec 2012 09:49:51 -0800
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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