Held: Wednesday, 2 April 2003
Summary: Today we consider how to write procedures for Script-Fu.
;;; Procedure: ;;; circle ;;; Parameters: ;;; image, the id of an image ;;; layer, the id of a layer on that image ;;; x, an integer ;;; y, an integer ;;; r, an integer ;;; Purpose: ;;; Draws a circle centered at (x,y) with radius r using the ;;; current foreground color and brush. ;;; Produces: ;;; Nothing, or so I hope. ;;; Preconditions: ;;; image and layer define an existing image and layer ;;; x, y, and r are all non-negative ;;; Postconditions: ;;; The specified layer now contains a circle with the specified ;;; dimensions. (define circle (lambda (image layer x y r) (gimp-ellipse-select image (- x r) (- y r) (+ r r) (+ r r) REPLACE 0 0 0) (gimp-edit-stroke layer) (gimp-selection-none image)))
randomcolor at a
randomplace with a
randomwidth using a
(create-image width height), which creates a new image of the specified width and height.
radius(distance from center to point).
Thursday, 16 January 2003 [Samuel A. Rebelsky]
Tuesday, 1 April 2003 [Samuel A. Rebelsky]
Wednesday, 2 April 2003 [Samuel A. Rebelsky]
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