Re: Drawing 25 000 Shape fast

Oliver Wong wrote:
[post re-ordered]

"MTP" <mtp@xxxxxxxxxxxxxxx> wrote in message news:e95r4e$lkr$2@xxxxxxxxxxxxxxxxxxxxx

Andrey Kuznetsov a écrit :

i have to render 25 000 "points" with each one a specific fill color, and a specific Shape (java.awt.Shape or customized) in a JPanel.

Drawing every Shape, one by one, is too slow (panning the view ins't smooth). So i tried to create a BufferedImage for each point, and render them instead. But it is even slower.

Direct : 3 sec
BI: 4.5 sec

And all the BI take about 60 Mbytes of memory, which is a lot.


use one BufferedImage.
You need to draw your shapes to BI only if something changes.


I already use this. But it's unusable if one of these events happen:
- pan (let's say that i'm at Zoom Factor 2000)


Zoom factor 2000? So if an object was previous 1x1 pixel, it is now 2000x2000 pixels?

yes

- zoom
- resize


What's the difference between zoom and resize, assuming vector (i.e. not raster) images?

weel zoom changes the data viewed, while resize change the way data are viewed


- the user want to map column 3 instead of column 4 for colors OR size of the shape OR type of shape


I need to reach 0.1 sec by any mean. Right now i'm thinking to add some kind of Z-buffer but with aliasing it's pretty hard i think. Trying ideas take time so i'm asking if somebody can help me.


Have you considered using Java3D/OpenGL and taking advantage of the 3D accelerator to perform zoom and pan?

i've tried -Dsun.java2d.opengl=true but the JVM was unstable and the performance boost was small.
.

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