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fn draw-box screen: (addr screen), row1: int, col1: int, row2: int, col2: int {
draw-horizontal-line screen, row1, col1, col2
draw-vertical-line screen, row1, row2, col1
draw-horizontal-line screen, row2, col1, col2
draw-vertical-line screen, row1, row2, col2
}
fn draw-hatching screen: (addr screen), row1: int, col1: int, row2: int, col2: int {
var c/eax: int <- copy col1
var r1/ecx: int <- copy row1
r1 <- increment
c <- add 2
{
compare c, col2
break-if->=
draw-vertical-line screen, r1, row2, c
c <- add 2
loop
}
}
fn draw-horizontal-line screen: (addr screen), row: int, col1: int, col2: int {
var col/eax: int <- copy col1
move-cursor 0, row, col
{
compare col, col2
break-if->=
print-code-point screen, 0x2500
col <- increment
loop
}
}
fn draw-vertical-line screen: (addr screen), row1: int, row2: int, col: int {
var row/eax: int <- copy row1
{
compare row, row2
break-if->=
move-cursor 0, row, col
print-code-point screen, 0x2502
row <- increment
loop
}
}
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