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M
7.
3500
2)
Straight
line drawing
00000
0028
0001
0027
0050
VRAM
16 bit
structure
Example
to
draw
a
straight
line
from
(X, Y) = (3, 1) to (X,
Y)
=
(635,
1).
Coordinates must
be
changed
to
absolute
addresses.
(3,
1) -
absolute
address
=
0028H
Dot
address
= 2H
Displacement between
two
points
when
the
line draw
direction
is OA (to the
right):
X =
635-3
= 632
(=278H),
Y=0
Whereas.
CSRW
TEXTW
VECTW
C 49H
PI
28H
P2 OOH
P3
20H
C
PI
78H
FF
P2 FF
HAD I, , H
dAU
Kind
of
line
(solid
line)
C
PI
P2
P3
P4
P5
P6
P7
P8
P9
4CH
OAH
78H
02H
88H
H>H
1
OH
FBH
OOH
OOH
}
Drawing direction
}
\ 1 AX I
1
f
2 ! AY 1 - I A x I
1
>
2 1 AY 1 -2 1 AX I
1
2 i AY !
WRITE
C 23H
VECTE
C 6CH
[Explanation]
Specify
the
kind
of
line
by
TEXTW, using
C for
command
code
and P for
parameter,
and
specify
the
line drawing
direction
using VECTW
and
above
four
values
using
X and
Y. The
rest
will
be
same
the dot
display
It is
also
possible
to
display
a dot
using
the
line drawing method
for any
line
drawing
direction
using
X = Y = 0.