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examples: update vmatrix.v to handle terminal resizing, minor visual tweaks (#21836)

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Mike Ward 2024-07-09 14:10:40 -05:00 committed by GitHub
parent 494be20564
commit ca07347430
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1 changed files with 29 additions and 15 deletions
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44
examples/vmatrix.v
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@ -5,7 +5,7 @@ import term.termios
import time
const snooze = time.millisecond * 70
const symbols = '0123456789!@#$%^&*()-_=+[]{}|;:,.<>?¡±¥£ÿ'
const symbols = '0123456789!@#$%^&*()-=+[]{}|;:<>?~bdjpqtvz'
struct RainColumn {
mut:
@ -21,11 +21,20 @@ fn main() {
fn rain() {
mut rain_columns := []RainColumn{}
width, height := term.get_terminal_size()
mut width := 0
mut height := 0
for {
// clear screen and all rain columns if terminal resized
w, h := term.get_terminal_size()
if w != width || h != height {
width = w
height = h
term.clear()
rain_columns.clear()
}
// gradually add more rain columns
if rain_columns.len < width {
if rain_columns.len < (width / 4 * 3) {
rain_columns << random_rain_column(width, height)
}
// update and print all rain columns
@ -33,40 +42,42 @@ fn rain() {
update_rain_column(mut rc, width, height)
print_rain_column(rc, height)
}
// snooze controls update speed
time.sleep(snooze)
}
}
fn update_rain_column(mut rc RainColumn, width int, height int) {
rc.head += 1
if rc.head >= height + rc.len + 1 {
if rc.head > height + rc.len {
rc = random_rain_column(width, height)
}
}
fn random_rain_column(max_col int, max_height int) RainColumn {
return RainColumn{
// console positions are 1 based, not zero
col: rand.int_in_range(1, max_col + 1) or { 1 }
len: rand.int_in_range(4, max_height / 4 * 3) or { 4 }
}
}
fn print_rain_column(rc RainColumn, height int) {
// print head in white
// print head in gray
if rc.head <= height {
print_at(random_symbol(), rc.col, rc.head)
print_at(term.gray(random_symbol()), rc.col, rc.head)
}
// print the char above the head in green to remove
// white color of the previous head. Dim chars
// gray color of the previous head. Dim chars
// randomly to add more interest to the effect
if (rc.head - 1) <= height {
symbol := random_dim(term.green(random_symbol()))
print_at(symbol, rc.col, rc.head - 1)
}
// remove tail by printing a space
t := rc.head - rc.len + 1
if t >= 0 && t <= height {
print_at(' ', rc.col, t)
tail := rc.head - rc.len + 1
if tail > 0 && tail <= height {
print_at(' ', rc.col, tail)
}
}
@ -88,15 +99,18 @@ fn random_dim(s string) string {
fn init_terminal() ! {
mut old_state := termios.Termios{}
termios.tcgetattr(0, mut old_state)
// restore cursor, exit alternate buffer mode on Ctrl+C
os.signal_opt(os.Signal.int, fn [mut old_state] (sig os.Signal) {
println('\e[?1049l\e[?25h')
// restore terminal state on exit
at_exit(fn [mut old_state] () {
termios.set_state(0, old_state)
println('\e[?1049l\e[?25h') // cursor on, alternate buffer mode off
})!
// exit on Ctrl+C
os.signal_opt(os.Signal.int, fn (sig os.Signal) {
exit(0)
})!
// turn off cursor, enter alternate buffer mode
print('\e[?1049h\e[?25l')
// exit/restore setup, ok to init terminal
mut new_state := old_state
new_state.disable_echo()
termios.set_state(0, new_state)
print('\e[?1049h\e[?25l') // cursor off, alternate buffer mode on
}