# Smoothing out curves from the mouse

3 replies [Last post]
mickleness
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Joined: 2005-07-14

It's a little hard to explain this in words, so I made an animation that demonstrates what I'm talking about:

http://homepage.mac.com/tech4learning/vectorizer.GIF

We have paint tools that paint the strokes the user makes with the mouse. If we literally record each mouse point and create a polygon from the path the mouse makes, the resulting path is ugly. I'm interested in ironing out that path.

We have a mechanism that currently achieves this. It's called a Vectorizer. (We made up the name.) But it's a little sluggish: it can't respond in real-time very well. (Especially if the path gets complex.)

Also I'd just be interested in seeing how other people approached this problem. Is there a body of work on this subject?

I don't even know the right jargon to use here; what is the correct name for the thing I'm looking for? (If I at least knew that then Google might be able to help me more...)

TOULA Michael

Mickleness,

What you are looking for is in the first Graphics Gems book (page 579).
The article is called "Explicit cubic spline interpolation formulas"
and explains just that.

Hope this helps,
Mike

On 8 janv. 08, at 21:14, java2d@JAVADESKTOP.ORG wrote:

> It's a little hard to explain this in words, so I made an animation
> that demonstrates what I'm talking about:
>
> http://homepage.mac.com/tech4learning/vectorizer.GIF
>
> We have paint tools that paint the strokes the user makes with the
> mouse. If we literally record each mouse point and create a
> polygon from the path the mouse makes, the resulting path is ugly.
> I'm interested in ironing out that path.
>
> We have a mechanism that currently achieves this. It's called a
> Vectorizer. (We made up the name.) But it's a little sluggish: it
> can't respond in real-time very well. (Especially if the path gets
> complex.)
>
> Also I'd just be interested in seeing how other people approached
> this problem. Is there a body of work on this subject?
>
> I don't even know the right jargon to use here; what is the correct
> name for the thing I'm looking for? (If I at least knew that then
> Google might be able to help me more...)
>
> Any comments would be welcome.
> [Message sent by forum member 'mickleness' (mickleness)]
>
>
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gmiecznik
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Joined: 2007-11-07

Mickleness

Have you been able to get a code example for your interpolation?

I am in the same boat, and cannot find any description/code useful
for rapid prototying.

Thank you
Gregory

jxc
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Joined: 2005-02-24