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Chapter 14
This chapter is about creating movies by doing simple frame-based animations and special
effects like chromakey. We first explain how much space you need to store a movie and why
movies are stored in a compressed form. Next we generate movies by drawing geometric shapes
at different locations in a series of frames, by drawing text at different locations in a series of
frames, and by copying part of a picture to different locations in a series of frames. To create a
In section 14.2 we modify movies by breaking each movie into a series of frames and then
modifying each frame. We use this to create a movie of children crawling on the moon. Again
we emphasize that we can make our previous Picture methods more reusable by passing in
parameters. We also use this to color correct an underwater movie.
One fun project is to have the students read headlines from a Web page and then create a ticker-
tape movie of the headlines.
convert –adjoin –border 1 –bordercolor black frame*.jpg frame.mpeg
This will create a movie called frame.mpeg from a series of JPEG frames that start with frame
and have an extension of .jpg. This is what how the FrameSequencer names the created frames.
Your students may run out of memory when they are creating their movies. You can have them
change how much memory DrJava uses by clicking on “Edit” and then on “Preferences” which
Figure 16. Showing how to ask for more memory.
