Re: [Rd] Wishlist: strwidth allow for rotation of text (PR#7931)

From: <>
Date: Sat 11 Jun 2005 - 11:02:04 GMT wrote:
> Hi,
> This is not a bug, but an enhancement suggestion. "strwidth" only gives the
> width of the text according to the x-axis user coordinates, and similarly
> for "strheight". Even if the par setting "srt" is changed to rotate the
> text, the resulting width (resp. height) is in terms of the non-rotated
> text. Currently, if I want to know how much space to leave for vertical
> text in the user coordinates, I manually invert the user coordinates, and
> then change them back.
> Even if arbitrary "srt" is too much, just having the option for 90 degree
> rotation would be helpful. If it were implemented for arbitrary srt, then I
> personally think it's x-axis and y-axis dimensions are of interest, and not
> the actual length of the rotated text.

I think it's pretty standard to measure text this way. You can get a very good approximation to arbitrary rotation by treating the text as a width by height rectangle, and using a bit of trig to calculation the rotated dimensions of that - but it's much harder to get the original dimensions back after doing this.

So I'd suggest that you should write a little function to calculate rotated dimensions, document it, and offer it to one of the Misc collections.

If you want to waste a lot of time on it you could try to do it in a way that can tell the difference between "Ay" and "yA" after a 45 degree rotation (the first is wider), but I think it will be hard to get that right.

Duncan Murdoch mailing list Received on Sat Jun 11 21:06:17 2005

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