Renderer improvement

examples/cube.rs

@@ -1,4 +1,4 @@
-use osmium::{sleep, terminal};
+use osmium::{entity::Component, sleep, terminal};
 
 fn main() {
     terminal::hide_cursor().unwrap();
@@ -6,8 +6,15 @@ fn main() {
     let engine = osmium::init();
 
     engine.thread("Main.tick", |engine| {
+        let mut tick = 0;
         loop {
-            engine.tick();
+            if tick == 60000 {
+                tick = 0;
+            }
+
+            engine.tick(tick);
+
+            tick += 1;
             sleep(4);
         }
     });
@@ -18,7 +25,36 @@ fn main() {
         r.draw_rect(2, 0, 1, 2, 0x0000ff);
     });
 
+    my_rect.component(Velocity(300));
+
     engine.start();
 
     terminal::show_cursor().unwrap();
 }
+
+pub struct Velocity(pub i32);
+
+impl Component for Velocity {
+    fn tick(&mut self, entity: &std::sync::Arc<osmium::entity::Entity>, tick: u16) {
+        let mut position = entity.position();
+        apply_velocity(tick, self.0, &mut position.x);
+    }
+}
+
+fn apply_velocity(tick: u16, velocity: i32, x: &mut u16) -> bool {
+    let abs_v = velocity.abs();
+    if abs_v == 0 {
+        return false;
+    }
+
+    let interval = (1000 / abs_v).max(1);
+    if tick as i32 % interval == 0 {
+        if velocity > 0 {
+            *x = x.saturating_add(1);
+        } else {
+            *x = x.saturating_sub(1);
+        }
+        return true;
+    }
+    false
+}