"Tim Hunter" <cyclists / nc.rr.com> schrieb im Newsbeitrag
news:j%gdd.27795$zA3.4433422 / twister.southeast.rr.com...
> Looking for coding style advice...
>
> I'm trying to write a method that describes a rectangle. A rectangle is
> defined by the x,y coordinates of its upper-left corner and its width
and
> height. These values are required. Optionally, the rectangle can have
> "styles," like the fill color and the stroke color. Also optionally, the
> rectangle can have rounded corners, if you specify how much rounding you
> want in the x and y directions. (The default is square corners.)
>
> The method I started with is:
>
> def rect(x, y, width, height, rx=0, ry=0, styles=nil)
>         # blah, blah, blah
> end
>
> Where the styles argument (if present) is a Hash formed by the usual
> trailing key=>value pairs. All very standard Ruby.
>
> I was thinking that you'd create a square-corner rectangle like this:
>
> canvas.rect(10, 10, 20, 30, :fill=>'black', :stroke='red')
>
> But of course that doesn't work, because the styles hash
> "{:fill=>'black', :stroke=>'red'}" gets assigned to rx, not to styles.
>
> Of course, within rect I could test the class of rx and/or ry and if
it's a
> Hash, assign it to styles, but that seems kludgy and insufficiently
> Rubyish. I could divide rect into two methods, rect and rounded_rect,
but
> that means that the user has to remember an extra method name. I could
make
> rx and ry required arguments. Blech.
>
> Thoughts?