Newbie looking for info on basic graphics with Delphi.

Hi.

I have delphi 5 personal and I am doing a short program to calculate
the sizes of timbers needed to build the carcass of an outbuilding.

What I'd like it to be able to draw a basic wireframe to scale on a
panel objuct on the main form. I have googled and come up with stuff
that I can't use or is too advanced. Can anyone point me to a basic
tutorial on stuff like this?

Questions I have are:

Does every viewable object (buttons, listboxes, panels etc) have its
own canvas?

Do I need to use a canvas to draw?

If not, how?

Where can I find some basic algorithms for wireframe drawing?

Thanks for any pointers.

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