Re: (dsssl) Vertical centering

Subject: Re: (dsssl) Vertical centering
From: Dan Richter <daniel.richter@xxxxxxxxx>
Date: Tue, 29 Apr 2003 09:54:06 +0200

I haven't found a single reference about how to vertically center a
flow object!

I don't know of any way to vertically center, but you can accomplish something similar with space-before and/or space-after. Set it to about the height of the page. You might even be able to work out something cute like (/ (- %page-height% (*your-font-size*)) 2). This won't account for mult-line titles, but I should think that approximate centering would be sufficient.

Just for fun, here are some excerpts from my titlepage generating code. Note that I had to define the meaning of "white". More importantly, I use "invisible text" to ensure spacing because simply using space-before on the first element of the titlepage doesn't accomplish what I want. Maybe someone else on the list can tell me why.

(define (My-Titlepage-Element node side)
  (if (equal? side 'recto)
      (with-mode My-Titlepage-Recto-Mode
        (process-node-list node))
      (with-mode My-Titlepage-Verso-Mode
        (process-node-list node))))

(mode My-Titlepage-Recto-Mode
  (element title
    (make paragraph
      (make paragraph     ;; This paragraph has no content.
        space-after: 6cm  ;; It's just for spacing.
        color: white      ;; White = invisible.
        (literal "."))
      (make paragraph
        font-size: 20pt
        font-weight: 'bold
        font-family-name: %title-font-family% ;; Defined in dbparam.dsl
        quadding: 'center
        space-after: 4cm
  (element subtitle
     ;; Other stuff here.

(mode Wimba-Titlepage-Verso-Mode
  ;; ...

========== Dan Richter ============== mailto:Dan@xxxxxxxxx ===========
 This may sound a little foreign to all you folks coming from a
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