Constrained Rectangle

[willzz32]

Hi All

I'm hoping i may be able to get some help with an exe i'm trying to create. I'm trying to create a rectangle within a space that changes raito but is constrained within the space of a second rectangle. It's mainly to workout a projection canvas and then drop 16:9 projectors 'Rectangles' over the canvas.
I thought this would be easy but i can't seem to crack it, It's probably something very simple but i just can't see the solution.
Any help would be much appreciated.

[martinvicanek]

I was not sure from your schematic what your goal is so I'll try to answer your question.

Suppose you have a rectangle with sides a and b, and you want to fit it into another rectangle with sides A and B, while maintaining the aspect ratio a/b. Your scale factor is

scale = min(A/a,B/b)

so your new rectangle will have the dimensions

a' = scale*a
b' = scale*b

Does that answer your question?

[willzz32]

Thanks for pointing me in the right direction. It most definitley helps.
I'm just creating a projection calculator to help me setting up projection on shows. I know there's a few out there already but i just wanted to see if i could do my own.
I really appreciate the fast response thank you. Matt

[martinvicanek]

Here is an example.

[willzz32]

Hi Martin

Thank you very much for the example.

It really helps me understand. Sorry for being a bit slow.

[pshannon]

thanks Martin, however, where is the rest of the image? lol

[martinvicanek]

http://www.lenna.org/full/len_full.html
Warning: may contain nudity!

[pshannon]

http://www.lenna.org/full/len_full.html
Warning: may contain nudity!

Thanks, she is nice, but I was just playing around. Teasing us with the half image.

[Spogg]

You do know that as moderators we really ought to delete porn.
But this is art, right?
Nice proper real and valid art.
And not porn, right?

Cheers

Spogg

[martinvicanek]

No, not porn. Art.
I would never post porn.