PainShop Pro Scripting - curved lines

Author

curved lines

Victor Reijs

2007-08-23, 6:20 pm

Hello all of you,

Do people know how to calculate a curve line as used e.g. in PSP? I am
thinking of knowing the begin and end node location and then on each
node a handle for the angle/derivative of each end of the line.
I am looking for a formula knowing the two points and these two
derivatives on each side, so that I can calculate it myself in my
script. Any link would be helpful

Thanks for your help.

All the best,

Victor

Spandex Rutabaga

2007-08-23, 10:18 pm

Victor Reijs wrote:
>
> Hello all of you,
>
> Do people know how to calculate a curve line as used e.g. in PSP? I am
> thinking of knowing the begin and end node location and then on each
> node a handle for the angle/derivative of each end of the line.
> I am looking for a formula knowing the two points and these two
> derivatives on each side, so that I can calculate it myself in my
> script. Any link would be helpful

Google for "bezier curve" or "spline curve". Also try searching
Mathworld (http://mathworld.wolfram.com/) for these topics.
http://mathworld.wolfram.com/BezierCurve.html
http://mathworld.wolfram.com/Spline.html
http://mathworld.wolfram.com/B-Spline.html

Victor Reijs

2007-08-23, 10:18 pm

Thanks Spandex, I could not find the correct 'key'word, this really
helps me!
Through your below URLs I got:
http://graphics.cs.ucdavis.edu/educ...zier-Curves.pdf

Thanks again.

Spandex Rutabaga wrote:

> Victor Reijs wrote:
>
>
>
> Google for "bezier curve" or "spline curve". Also try searching
> Mathworld (http://mathworld.wolfram.com/) for these topics.
> http://mathworld.wolfram.com/BezierCurve.html
> http://mathworld.wolfram.com/Spline.html
> http://mathworld.wolfram.com/B-Spline.html

Brigitte Seiffert

2007-09-04, 6:18 pm

Hi,
here are some interesting scripts
http://www.econym.demon.co.uk/psp8scripts/index.htm for paint Spirals and
Curves as samples
Regards
Brigitte