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ABOUT THIS CHAPTER
This chapter begins with a brief overview of play field features, including definitions of
some fundamental terms, and continues with the following major topics:
o
Forming a single "basic" play field, which is a playfield the same size as the
display screen. This section includes concepts that are fundamental to forming
any playfield.
o
Forming a dual-playfield display in which one playfield is superimposed upon
another. This procedure differs from that of forming a basic playfield in some
details.
o
Forming playfields of various sizes and displaying only part of a larger playfield.
o
Moving play fields by scrolling them vertically and horizontally.
o
Advanced topics to help you use playfields in special situations.
For information about mova,ble sprite objects, see chapter 4, "Sprite Hardware." There
are also movable playfield objects, which are subsections of a playfield. To move por-
tions of a playfield, you use a technique called playfield animation, which is described in
chapter 6, "Blitter Hardware."
PLAYFIELD FEATURES
The Amiga produces its video displays with raster display techniques. You create a
graphic display by defining one or more bit-planes in memory and filling them with Is
and Os to determine the colors in your display. The picture you see on the screen is
made up of a series of horizontal video lines displayed one after the other.
28 Playfield Hardware
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