jmol-developers

[Jmol-developers] anti-aliasing?

[E.L. W. <eg...@sc...>]

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Miguel,

is anti-aliasing still enabled in HEAD? How can one turn it on/off?

Peter asked about AA in JChemPaint too; is it difficult to add AA, or is it=
=20
some option of the JDK?

Egon

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eg...@sc...
PhD on Molecular Representation in Chemometrics
Nijmegen University
http://www.cac.sci.kun.nl/people/egonw/
GPG: 1024D/D6336BA6

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[Jmol-developers] anti-aliasing tech note

[Miguel <mi...@jm...>]

> is anti-aliasing still enabled in HEAD? How can one turn it on/off?

Anti-aliasing is not enabled in Jmol-HEAD. Most of the code is still in
place, but it needs work in order to function properly.

For more details see below.

> Peter asked about AA in JChemPaint too; is it difficult to add AA, or i=
s
> it some option of the JDK?

JChemPaint is using the 2D graphics calls that are built into the JDK.
These graphics primitives include support for anti-aliasing. Therefore, i=
t
seems to me that it should be easy for you to enable anti-aliasing within=

JChemPaint.

The techniques that you will use are the same that we used in Jmol v6-v9.=

The RenderingHints that you will use will be exactly the same. I encourag=
e
you to take a look at that code and then send questions if there are
things that you do not understand.


Miguel



Anti-aliasing tech note
-----------------------
The Jmol Graphics3D engine is implemented completely in software. It
cannot use the underlying Sun 2D graphics calls because they do not offer=

the zBuffer functionality of deciding on a pixel-by-pixel basis whether o=
r
not a pixel should be drawn.

The anti-aliasing technique used in the Jmol Graphics3D engine is called
full-scene-anti-aliasing. The entire scene is rendered into a buffer that=

is twice as wide and twice as high. Then, 4 pixels are converted into 1
pixel, with appropriate mixing of RGB values.

The end result is that it takes more memory to hold the zBuffer and
pixelBuffer. And it takea lot more CPU cycles to render a scene. The
drawing part takes 4 times as long. Overall, it probably takes 3 times as=

long to render a scene.

On newer machines with lots of CPU power this is probably not a problem.
On older machines it would be unacceptable.

Therefore, we need to put in some options.


> Egon
>
> - --
> egonw=40sci.kun.nl
> PhD on Molecular Representation in Chemometrics
> Nijmegen University
> http://www.cac.sci.kun.nl/people/egonw/
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Re: [Jmol-developers] anti-aliasing tech note

[E.L. W. <eg...@sc...>]

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On Monday 07 June 2004 12:35, Miguel wrote:
> JChemPaint is using the 2D graphics calls that are built into the JDK.

Is it? It uses CDK's Renderer2D which has this import:

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

I thought Java2D uses Graphics2D ?

Egon

=2D --=20
eg...@sc...
PhD on Molecular Representation in Chemometrics
Nijmegen University
http://www.cac.sci.kun.nl/people/egonw/
GPG: 1024D/D6336BA6

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Re: [Jmol-developers] anti-aliasing tech note

[Miguel <mi...@jm...>]

I just sent a message to jchempaint-devel that crossed yours in the mail.

> On Monday 07 June 2004 12:35, Miguel wrote:
>> JChemPaint is using the 2D graphics calls that are built into the JDK.
>
> Is it? It uses CDK's Renderer2D which has this import:
>
> import java.awt.Font;
> import java.awt.FontMetrics;
> import java.awt.Graphics;
> import java.awt.Point;
> import java.awt.event.MouseEvent;
>
> I thought Java2D uses Graphics2D ?

All Java code since 1.2 uses Java2D.

For backwards compatibility, the paint(...) routine still takes a Graphics
object. But you can immediately cast this to be a Graphics2D object.

void paint(Graphics g) {
  Graphics2D g2d = (Graphics2D)g;
  ...
}


This is the proper way to do it as documented by Sun.

You can then use

 g2d.setRenderingHint(...)

to turn on antialiasing.


Miguel

Re: [Jchempaint-devel] Re: [Jmol-developers] anti-aliasing tech note

[Peter Murray-R. <pm...@ca...>]

At 16:42 07/06/2004 +0200, E.L. Willighagen wrote:
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>
>On Monday 07 June 2004 12:35, Miguel wrote:
> > JChemPaint is using the 2D graphics calls that are built into the JDK.
>
>Is it? It uses CDK's Renderer2D which has this import:
>
>import java.awt.Color;
>import java.awt.Font;
>import java.awt.FontMetrics;
>import java.awt.Graphics;
>import java.awt.Point;
>import java.awt.event.MouseEvent;
>import java.awt.event.MouseMotionListener;
>
>I thought Java2D uses Graphics2D ?

That is what I am talking about. It has lots of goodies besides 
antialiasing - style, scaling, rotations, etc.

Best

>P.


Peter Murray-Rust
Unilever Centre for Molecular Informatics
Chemistry Department, Cambridge University
Lensfield Road, CAMBRIDGE, CB2 1EW, UK
Tel: +44-1223-763069

Re: [Jmol-developers] anti-aliasing tech note

[Egon W. <eg...@sc...>]

On Monday 07 June 2004 18:27, Miguel wrote:
> You can then use
>
>  g2d.setRenderingHint(...)
>
> to turn on antialiasing.

Indeed. Just did that. The result is amazing (as always with anti-aliasing).
It will be a rendering option in JCP 2.0.2.

Egon

Re: [Jmol-developers] anti-aliasing tech note

[Miguel <mi...@jm...>]

> On Monday 07 June 2004 18:27, Miguel wrote:
>> You can then use
>>
>>  g2d.setRenderingHint(...)
>>
>> to turn on antialiasing.
>
> Indeed. Just did that. The result is amazing (as always with
> anti-aliasing).

Very good ... glad it worked out :-)


Miguel