I/O

src/main.rs

@@ -7,6 +7,7 @@ use embedded_graphics::{
     text::{Alignment, Text, TextStyleBuilder},
 };
 use time::{OffsetDateTime, macros::offset};
+use tokio::time::Instant;
 
 use crate::g13::{G13, G13_LCD_COLUMNS, G13_LCD_ROWS};
 
@@ -26,24 +27,33 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             .baseline(embedded_graphics::text::Baseline::Middle)
             .build();
 
+        let mut x = G13_LCD_COLUMNS as f64 / 2.0;
+        let mut y = G13_LCD_ROWS as f64 / 2.0;
+
+        // 30 fps render loop
+        let mut dt = 0.0;
         loop {
+            let start = Instant::now();
             let now = OffsetDateTime::now_utc().to_offset(offset!(+1));
 
+            // Update Logic
+            x += _g13.state.get_x().await * dt * 25.0;
+            y += _g13.state.get_y().await * dt * 25.0;
+
+            // Render
             let string = format!("{:0>2}:{:0>2}:{:0>2}", now.hour(), now.minute(), now.second());
 
             _g13.clear(BinaryColor::Off).unwrap();
-            Text::with_text_style(
-                &string,
-                Point::new(G13_LCD_COLUMNS / 2, G13_LCD_ROWS / 2),
-                character_style,
-                textstyle,
-            )
-            .draw(&mut _g13)
-            .unwrap();
+            Text::with_text_style(&string, Point::new(x as i32, y as i32), character_style, textstyle)
+                .draw(&mut _g13)
+                .unwrap();
 
             _g13.render().unwrap();
 
-            tokio::time::sleep(Duration::from_secs(1)).await;
+            // Calculate delta time
+            let delta = Instant::now() - start;
+            tokio::time::sleep(Duration::from_millis(33) - delta).await;
+            dt = (Instant::now() - start).as_secs_f64();
         }
     });