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time delta bug

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This commit is contained in:
Andrew Johnson 2018-03-25 16:06:55 -06:00
parent fcda99b176
commit cb8f0acf69
1 changed files with 11 additions and 11 deletions
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20
Chapter02/src/main.rs
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@ -69,7 +69,7 @@ fn main()
}
//5. Loop while there are remaining floor requests
let mut prev_loop_time = SystemTime::now();
let mut prev_loop_time = Instant::now();
let termsize = termion::terminal_size().ok();
let termwidth = termsize.map(|(w,_)| w-2).expect("termwidth") as u64;
let termheight = termsize.map(|(_,h)| h-2).expect("termheight") as u64;
@ -78,10 +78,10 @@ fn main()
while floor_requests.len() > 0
{
//5.1. Update location, velocity, and acceleration
let dt = prev_loop_time.duration_since(prev_loop_time)
.expect("SystemTime::duration_since failed")
let now = Instant::now();
let dt = now.duration_since(prev_loop_time)
.as_fractional_secs();
prev_loop_time = SystemTime::now();
prev_loop_time = now;
location = location + velocity * dt;
velocity = velocity + acceleration * dt;
@ -108,7 +108,7 @@ fn main()
let carriage_floor = cmp::max(carriage_floor, 0);
let carriage_floor = cmp::min(carriage_floor, floor_count-1);
let mut terminal_buffer = vec![' ' as u8; (termwidth*termheight) as usize];
for ty in 0..(floor_count-1)
for ty in 0..floor_count-1
{
terminal_buffer[ (ty*termwidth + 0) as usize ] = '[' as u8;
terminal_buffer[ (ty*termwidth + 1) as usize ] =
@ -120,12 +120,12 @@ fn main()
}
let stats = vec![
format!("Carriage at floor {}", carriage_floor+1),
format!("Location {}", location),
format!("Velocity {}", velocity),
format!("Acceleration {}", acceleration),
format!("Voltage [up-down] {}", up_input_voltage-down_input_voltage)
format!("Location {:.06}", location),
format!("Velocity {:.06}", velocity),
format!("Acceleration {:.06}", acceleration),
format!("Voltage [up-down] {:.06}", up_input_voltage-down_input_voltage),
];
for sy in 0..(stats.len()-1)
for sy in 0..stats.len()
{
for (sx,sc) in stats[sy].chars().enumerate()
{