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;;; guile-2d
;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
;;;
;;; Guile-2d is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-2d is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Font rendering.
;;
;;; Code:
(define-module (2d font)
#:use-module (figl gl)
#:use-module (srfi srfi-9)
#:use-module (system foreign)
#:use-module (2d wrappers ftgl)
#:use-module (2d color)
#:use-module (2d vector))
;;;
;;; Font
;;;
;; Font objects represent an FTGL texture font at a given size.
(define-record-type <font>
(make-font ftgl-font size)
font?
(ftgl-font font-ftgl-font)
(size font-size))
(define (load-font filename size)
"Loads a font from a file with a given size in points."
(let ((ftgl-font (ftgl-create-texture-font filename)))
;; Hardcoded 72 dpi for now.
(ftgl-set-font-face-size ftgl-font size 72)
(make-font ftgl-font size)))
(define (flip-text font)
"Flips current GL matrix about the x-axis and translates by the
negative font ascender value. This is necessary before rendering text
because guile-2d flips the y-axis so that the origin is in the
upper-left corner rather than the bottom-left."
(gl-scale 1 -1 1)
(gl-translate 0 (- (ftgl-get-font-ascender (font-ftgl-font font))) 0))
(define (draw-font font text)
"Renders the string text using the given font."
(with-gl-push-matrix
(flip-text font)
(ftgl-render-font (font-ftgl-font font)
text
(ftgl-render-mode all))))
(export <font>
make-font
font?
font-ftgl-font
font-size
load-font
draw-font)
;;;
;;; Textbox
;;;
;; A textbox is a string of word-wrapped text
(define-record-type <textbox>
(%make-textbox font text position color alignment line-length layout)
textbox?
(font textbox-font)
(text textbox-text set-textbox-text!)
(position textbox-position set-textbox-position!)
(color textbox-color set-textbox-color!)
(alignment textbox-alignment)
(line-length textbox-line-length)
(layout textbox-layout))
(define (make-textbox font text position color alignment line-length)
(let ((layout (ftgl-create-layout)))
(ftgl-set-layout-font layout (font-ftgl-font font))
;; (ftgl-set-layout-alignment layout (ftgl-text-alignment alignment))
(ftgl-set-layout-line-length layout line-length)
(%make-textbox font text position color alignment line-length layout)))
(define (draw-textbox textbox)
(let ((pos (textbox-position textbox)))
(with-gl-push-matrix
(gl-translate (vx pos) (vy pos) 0)
(flip-text (textbox-font textbox))
(apply-color (textbox-color textbox))
(ftgl-render-layout (textbox-layout textbox)
(textbox-text textbox)
(ftgl-render-mode all)))))
(export <textbox>
make-textbox
textbox?
textbox-font
textbox-text
set-textbox-text!
textbox-position
set-textbox-position!
textbox-color
set-textbox-color!
textbox-alignment
textbox-line-length
textbox-layout
draw-textbox)
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