Got scan lines working

This uses the idea of px per ms to calculate where the dot should be

src/main.rs

@@ -1,38 +1,61 @@
 use core::f32;
+use std::{io, time::{Duration, Instant}};
 
 use macroquad::prelude::*;
 
 #[macroquad::main("InputKeys")]
 async fn main() {
-    // sin wave
+    // Dot position
-    let mut freq = 0.1;
-    let mut amp = 50.0;
-    let freq_mod = 0.001;
-    let amp_mod = 5.;
     let y_offset = screen_height() / 2.0;
-    let mut x_offset = 0.0;
+    let mut x_offset = screen_width();
-    let x_mod = 5.0;
 
-    // selection box
+    // Selection box
     let mut inital_x_pos = 0.;
     let mut inital_y_pos = 0.;
     
+    // Tooling
     let mut show_debug = false;
+    let mut last_frame = Instant::now();
+    let mut px_per_ms: f32 = 0.5;
 
     loop {
         clear_background(BLACK);
-        if show_debug {
+
+        let delta_time = last_frame.elapsed().as_millis() as f32;
+
+        if x_offset >= screen_width() {
+            x_offset = 0.;
+        } else {
+            x_offset = x_offset + delta_time * px_per_ms;
+        }
+
+        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(&format!("Amplitude: {}, Freqency {}, X Offset {}", amp, freq, x_offset)                  , text_margin, text_h*1. +text_margin, text_h, WHITE);
+            draw_text(text, text_margin, text_h*index+text_margin, text_h, WHITE);
-            draw_text(&format!("Cursor {:?}, Last Click {:?}", mouse_position(), (inital_x_pos, inital_y_pos))  , text_margin, text_h*2. +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);
         }
         
         // toggle debug box
-        if is_key_pressed(KeyCode::LeftControl) {
+        if is_key_pressed(KeyCode::D) {
             show_debug = !show_debug;
         }
-
+        if is_key_pressed(KeyCode::Up) {
+            px_per_ms += 0.1;
+        }
+        if is_key_pressed(KeyCode::Down) {
+            px_per_ms -= 0.1;
+        }
         // selection box
         if is_mouse_button_pressed(MouseButton::Left) {
             (inital_x_pos, inital_y_pos) = mouse_position();
@@ -46,33 +69,8 @@ async fn main() {
             draw_rectangle(inital_x_pos, inital_y_pos, width, height, Color { r: 0.2, g: 0.1, b: 1., a: 0.5 });
         }
 
-        // sin wave
+        last_frame = Instant::now();
-        for x in 0..(screen_width() as i32) {
-            let x = x as f32;
-
-            let y = f32::sin(x * freq + x_offset)*amp + y_offset;
-                
-            draw_circle(x, y, 3.0, GREEN);
-        }
-        if is_key_down(KeyCode::PageUp) {
-            freq += freq_mod;
-        }
-        if is_key_down(KeyCode::PageDown) {
-            freq -= freq_mod;
-        }
-        if is_key_down(KeyCode::Up) {
-            amp += amp_mod;
-        }
-        if is_key_down(KeyCode::Down) {
-            amp -= amp_mod;
-        }
-        if is_key_down(KeyCode::Left) {
-            x_offset += x_mod;
-        }
-        if is_key_down(KeyCode::Right) {
-            x_offset -= x_mod;
-        }
-
         next_frame().await
     }
 }
+