Coordinate space design about fig

[everythingfunctional]

You may want to support 3 different sizes (one with multiple units):

• fraction of drawing size
• pixels
• absolute size (i.e. inches, cm, etc.)

Note that the conversions between any of them depend on how the size and resolution of the drawing is specified

[AnonMiraj]

I have a question.

Let's say I have a circle centered at (0.5, 0.5) with a radius of 0.25.
I would assume that the radius would also be between 0 and 1.

But how would it be translated to, for example, an 800*600 canvas?
I don't think it really makes sense for the circle to become an ellipse.
Should it translate like this: Radius: 0.25 * (800+600)/2 = 175 pixels, or is there a better way?

[everythingfunctional]

You may want to have distinction between size and position.

[AnonMiraj]

So I should leave all size units as pixels?