diff --git a/src/main.rs b/src/main.rs
index d55ce2b..a966c90 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,10 @@
+use core::f32;
+
 use macroquad::prelude::*;
 
 #[macroquad::main("InputKeys")]
 async fn main() {
+    // sin wave
     let mut freq = 0.1;
     let mut amp = 50.0;
     let freq_mod = 0.001;
@@ -10,17 +13,45 @@ async fn main() {
     let mut x_offset = 0.0;
     let x_mod = 5.0;
 
-    loop {
-        clear_background(LIGHTGRAY);
+    // selection box
+    let mut inital_x_pos = 0.;
+    let mut inital_y_pos = 0.;
 
+    let mut show_debug = false;
+
+    loop {
+        clear_background(BLACK);
+        if show_debug {
+            draw_text(&format!("Amplitude: {}, Freqency {}, X Offset {}", amp, freq, x_offset), 20.0, 40.0, 20.0, WHITE);
+            draw_text(&format!("Cursor {:?}, Last Click {:?}", mouse_position(), (inital_x_pos, inital_y_pos)), 20.0, 60.0, 20.0, WHITE);
+        }
+        
+        // toggle debug box
+        if is_key_pressed(KeyCode::LeftControl) {
+            show_debug = !show_debug;
+        }
+
+        // selection box
+        if is_mouse_button_pressed(MouseButton::Left) {
+            (inital_x_pos, inital_y_pos) = mouse_position();
+        }
+        if is_mouse_button_down(MouseButton::Left) {
+
+            let (x, y) = mouse_position();
+            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 });
+        }
+
+        // sin wave
         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, 5.0, YELLOW);
+            draw_circle(x, y, 3.0, GREEN);
         }
-
         if is_key_down(KeyCode::PageUp) {
             freq += freq_mod;
         }
@@ -40,7 +71,6 @@ async fn main() {
             x_offset -= x_mod;
         }
 
-        draw_text(&format!("Amplitude: {}, Freqency {}, X Offset {}", amp, freq, x_offset), 20.0, 40.0, 20.0, DARKGRAY);
         next_frame().await
     }
 }