blob: e5767de87c59b97da5c4eced3741b05a0fe60f62 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
type screen-position-state {
nrows: int # const
ncols: int # const
toprow: int
botrow: int
leftcol: int
rightcol: int
row: int
col: int
}
fn init-screen-position-state self: (addr screen-position-state), nrows: int, ncols: int {
# hardcoded parameters:
# top-margin
# page-margin
# page-width
var dest/eax: (addr int) <- copy 0
# self->nrows = nrows
# self->ncols = ncols
# self->toprow = top-margin
# self->botrow = nrows
# self->leftcol = page-margin
# self->rightcol = self->leftcol + page-width
# start-drawing(self)
}
fn start-drawing self: (addr screen-position-state) {
# self->row = toprow
# self->col = leftcol
}
fn add-char self: (addr screen-position-state), c: byte {
# print c
# self->col++
# if (self->col > self->rightcol) next-line(self)
}
fn next-line self: (addr screen-position-state) {
# self->row++
# if (self->row > self->botrow) next-page(self)
}
fn next-page self: (addr screen-position-state) {
# self->leftcol = self->rightcol + 5
# self->rightcol = self->leftcol + page-width
}
fn done-drawing? self: (addr screen-position-state) -> result/eax: boolean {
# self->rightcol >= self->ncols
}
|