This project creates an animated GIF of Duke, the Java mascot, waving. The animation is created from a sequence of images in an old copy of The Java Tutorial. The output GIF file consists of bilevel images so that they can be shown in quick succession on an e-paper display using the animation (A2) waveform mode, which works only with pure black and white pixels.
See the associated JavaFX project for a video of the animation on an e-paper display.
The animation is created from the sequence of 10 images on the page Displaying a Sequence of Images in the 1997 version of The Java Tutorial. The page is in the Table of Contents under the nested headings: Creating a User Interface, Working with Graphics, Performing Animation, Displaying a Sequence of Images. The old Java Tutorial can be found on several websites including the previous link to the winter 1999 session of CSE 341: Programming Languages at the University of Washington.
The content of this project itself is licensed under the GNU General Public License v3.0 except for the sequence of source images and the output animated GIF, which are published under the following license from Sun Microsystems, Inc., now Oracle Corporation.
Copyright (c) 1995-1997 Sun Microsystems, Inc. All Rights Reserved.
Permission to use, copy, modify, and distribute this software and its documentation for NON-COMMERCIAL purposes and without fee is hereby granted provided that this copyright notice appears in all copies. Please refer to the file "copyright.html" for further important copyright and licensing information.
SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
This copyright notice accompanies the source code of the program in The Java Tutorial that displays the images, which should permit my use of them here. Although Duke was open sourced under a BSD license in 2006, I have been unable to confirm that the specific sequence of source images used by this project were included.
The Makefile requires the following programs on your PATH environment variable.
- convert – converts between image formats and edits images
- mkbitmap – transforms images into bitmaps with scaling and filtering
- potrace – transforms bitmaps into vector graphics
- inkscape – an SVG editing program
To build duke-waving.gif, run the make command in the directory that contains the Makefile.
The sequence of source images (55 × 68 px):
The output animated GIF in pure black and white (324 × 400 px):
