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