Laser 128 - Entering Ashape Table

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3.11.S

BASIC COMMANDS AND

STATEMENTS

Entering

a

shape

table

Once

you

have

defined

your

shape,

and

broken

it

down

into

vectors,

the

next

step

is

to

convert

the

vector

into

binary

codes

so

that

your

computer

can

accept

them

and

reproduce

the

shape

on

the

display

later.

Two

types

of

vector

are

possible:

I.

move

and

plot;

and

2.

move

but

do

not

plot.

For

each

of

these

two

basic

types

there

are

four

directions:

up,

down,

left,

and

right.

In

all

there

are

eight

shape

vectors,

and

they

have

the

following

three-bit

binary

codes:

000 move

up

00 I move

right

0 l 0 move

down

011 move

left

100

move

up

and

plot

10 I

move

right

and

plot

110

move

down

and

plot

111

move

left

and

plot

For

instance,

the

diagonal

line

can

be

represented

as

follows,

starting

from

the

left:

100 move

up

and

plot

101

move

right

and

plot

100 move

up

and

plot

101

move

right

and

plot

10 I move

right

and

plot

100 move

up

and

plot

II-35

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