(defpackage :lisp-magick-examples
  (:use :cl :lisp-magick))
(in-package :lisp-magick-examples)

(defun create-thumbnail (filename thumbname width height)
  "Create a thumbnail the image in FILENAME with a max size of WIDTH x HEIGHT
pixel (but with the original aspect ratio) and save it in THUMBNAME."
  (with-magick-wand (wand :load filename)
    (let ((a (/ (magick-get-image-width wand)
                (magick-get-image-height wand))))
      (if (> a (/ width height))
          (magick-scale-image wand width (truncate (/ width a)))
          (magick-scale-image wand (truncate (* a height)) height)))
    (magick-write-image wand thumbname)))

(defun draw-a-few-lines (filename width height)
  "Create a new image with WIDTH x HEIGHT pixel containing 50 random lines
and save it in FILENAME."
  (with-magick-wand (wand :create width height :comp (0 0 0))
    (with-drawing-wand (dw)
      (with-pixel-wand (pw :comp (255 255 255))
        (draw-set-stroke-color dw pw))
      (draw-set-stroke-width dw 3d0)
      (dotimes (i 50)
        (draw-line dw (coerce (random width) 'double-float)
                   (coerce (random height) 'double-float)
                   (coerce (random width) 'double-float)
                   (coerce (random height) 'double-float)))
      (magick-draw-image wand dw))
    (magick-write-image wand filename)))

Copyright (c) 2006, 2007, 2008, 2009  Hans Bulfone
All rights reserved.

Redistribution and use in source and binary forms, with or without
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      without specific prior written permission.

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