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Re: clip-region interaction with princ
- To: email@example.com
- Subject: Re: clip-region interaction with princ
- From: "Mark A. Tapia" <firstname.lastname@example.org>
- Date: Wed, 29 Dec 1993 12:18:12 -0500
- Cc: email@example.com
On Wed, 29 Dec 1993, Pete Szolovits writes:
I need to clip text to a region (really a rect) in a window, but it seems that
the standard princ function applied to a window does not obey the clip region.
E.g., if you evaluate the following code, the paint-rect is properly clipped,
but the princ is not.
In the code, Pete includes the princ function to print a string.
The problem is that princ is not a QuickDraw function, while paintRect
is. Actually, paintRect calls the appropriate trap #_PaintRect.
Replace the call to princ by using the #_drawText trap call to call
You'll just need to define the following macro:
;; The with-font-spec macro appears in Michael Engebers oodles-of-utils
(defmacro with-font-spec (font-spec &body body)
(if (and (listp font-spec) (every #'constantp font-spec))
(multiple-value-bind (ff ms) (font-codes font-spec)
`(with-font-codes ,ff ,ms ,@body))
(let ((ff (gensym))
`(multiple-value-bind (,ff ,ms) (font-codes ,font-spec)
(with-font-codes ,ff ,ms ,@body)))))
Now, replace the call to princ by the following code fragment,
ensuring that "view" refers the current view of interest:
(let ((the-text "A very long sample of text to be displayed in the window that
is too long"))
(with-font-spec (slot-value menu 'menu-font)
(with-returned-pstrs ((text-buff the-text))
(#_MoveTo :long new-point)
(#_DrawText :ptr text-buff :integer 1 :integer (length the-text))))