Improve delta time (as in it actually works)

Also improve the debug screen

src/main.rs

@@ -1,13 +1,57 @@
 use core::f32;
-use std::{io, time::{Duration, Instant}};
 
 use macroquad::prelude::*;
 
-#[macroquad::main("InputKeys")]
+const DOT_RADIUS: f32 = 1.0;
+
+struct Dot {
+    x: f32,
+    y: f32,
+}
+
+impl Dot {
+    fn new(x: f32, y: f32) -> Self {
+        Self {x,y}
+    }
+    fn draw(&self) {
+        draw_circle(self.x, self.y,DOT_RADIUS, GREEN);
+    }
+}
+
+struct DebugWindow {
+    text: Vec<String>,
+    text_margin: f32,
+}
+impl DebugWindow {
+    fn new() -> Self {
+        Self {
+            text: Vec::new(),
+            text_margin: 20.0,
+        }
+    }
+    fn add_line(&mut self, line: String) {
+        self.text.push(line);
+    }
+    fn draw(&self) {
+        let params = TextParams { color: WHITE, ..Default::default()} ;
+
+        self.text.iter().enumerate().for_each(|(index, text)| {
+            let x = self.text_margin;
+            let y = self.text_margin+20.*(index as f32 + 1.);
+
+            // let measurement = measure_text(text, None, params.font_size, params.font_scale);
+            // draw_rectangle(x,y,measurement.width,-measurement.height, Color { r: 1., g: 1., b: 1., a: 0.25 });
+            draw_text_ex(text, x, y, params.clone());
+        });
+    }
+}
+
+#[macroquad::main("Graph")]
 async fn main() {
-    // Dot position
+    // Dot params 
     let y_offset = screen_height() / 2.0;
     let mut x_offset = screen_width();
+    let mut trail: Vec<Dot> = Vec::new();
 
     // Selection box
     let mut inital_x_pos = 0.;
@@ -15,46 +59,36 @@ async fn main() {
     
     // Tooling
     let mut show_debug = false;
-    let mut last_frame = Instant::now();
-    let mut px_per_ms: f32 = 0.5;
+    let mut px_per_s: f32 = 100.;
 
     loop {
         clear_background(BLACK);
 
-        let delta_time = last_frame.elapsed().as_millis() as f32;
+        let delta_time = get_frame_time();
 
         if x_offset >= screen_width() {
+            // wrap once you've hit the end of the line
             x_offset = 0.;
+            trail.clear();
         } else {
-            x_offset = x_offset + delta_time * px_per_ms;
+            x_offset = x_offset + (delta_time * px_per_s);
         }
 
         let x  = 0.+x_offset;
         let y  = 0.+y_offset;
-        draw_circle(x, y, 3.0, GREEN);
 
-        fn text(text: &str, index: usize) {
-            let index = index as f32;
-            let text_h = 20.0;
-            let text_margin = 20.0;
-            draw_text(text, text_margin, text_h*index+text_margin, text_h, WHITE);
-        }
-        if show_debug {
-            text(&format!("FPS {}", get_fps()), 0);
-            text(&format!("Pos {:?}", (x,y)), 1);
-            text(&format!("Cursor {:?}, Last Click {:?}", mouse_position(), (inital_x_pos, inital_y_pos)), 2);
-            text(&format!("px/ms {px_per_ms}"), 3);
-        }
+        let dot = Dot::new(x,y);
+        trail.push(dot);
+        trail.iter().for_each(|d| d.draw());
 
-        // toggle debug box
         if is_key_pressed(KeyCode::D) {
             show_debug = !show_debug;
         }
         if is_key_pressed(KeyCode::Up) {
-            px_per_ms += 0.1;
+            px_per_s += 5.;
         }
         if is_key_pressed(KeyCode::Down) {
-            px_per_ms -= 0.1;
+            px_per_s -= 5.;
         }
         // selection box
         if is_mouse_button_pressed(MouseButton::Left) {
@@ -66,11 +100,19 @@ async fn main() {
             let width = x - inital_x_pos;
             let height = y - inital_y_pos;
 
-            draw_rectangle(inital_x_pos, inital_y_pos, width, height, Color { r: 0.2, g: 0.1, b: 1., a: 0.5 });
+            draw_rectangle(inital_x_pos, inital_y_pos, width, height, Color { r: 0.2, g: 0.1, b: 1., a: 0.3 });
+        }
+        // toggle debug box
+        if show_debug {
+            let mut debug = DebugWindow::new();
+            debug.add_line(format!("FPS {}, Latency {:.2}ms", get_fps(), delta_time * 1000.0));
+            debug.add_line(format!("px/s {}", px_per_s));
+            debug.add_line(format!("Dots {}", trail.len()));
+            debug.add_line(format!("Cursor Pos {:?}", mouse_position()));
+            debug.draw();
         }
 
-        last_frame = Instant::now();
-        next_frame().await
+        next_frame().await;
     }
 }