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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