add remove point

src/main.rs

@@ -57,6 +57,7 @@ enum Message {
     LengthChange(String),
     ChangeDelta(f32),
     AddPoint,
+    RemovePoint,
 }
 
 struct MyApp {
@@ -173,6 +174,9 @@ impl MyApp {
             Message::AddPoint => {
                 self.music.add_point(self.current_delta);
             }
+            Message::RemovePoint => {
+                self.music.remove_point(self.current_delta);
+            }
         }
     }
 
@@ -315,7 +319,8 @@ impl MyApp {
                         delta_to_string(self.music.length)
                     ))
                     .size(20.0),
-                    button("Add Point").on_press(Message::AddPoint)
+                    button("Add Point").on_press(Message::AddPoint),
+                    button("Remove Point").on_press(Message::RemovePoint),
                 ]
                 .spacing(20),
                 column![

src/music.rs

@@ -35,6 +35,17 @@ impl Music {
             &mut self.poly_frame.last_mut().unwrap().1
         }
     }
+    fn find_index_frame(&mut self, delta: f32) -> usize {
+        if let Some(i) = self
+            .poly_frame
+            .windows(2)
+            .position(|w| w[0].0 <= delta && delta < w[1].0)
+        {
+            i
+        } else {
+            self.poly_frame.len() - 1
+        }
+    }
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~PUBLIC~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     pub fn current_frame(&self, delta: f32) -> &PolygonFrame {
         if let Some(i) = self
@@ -121,6 +132,12 @@ impl Music {
         self.poly_frame
             .insert(pos, (delta, self.current_frame(delta).clone()));
     }
+    pub fn remove_point(&mut self, delta: f32) {
+        let i = self.find_index_frame(delta);
+        if i != 0 {
+            self.poly_frame.remove(i);
+        }
+    }
 
     pub fn add_polygon(&mut self, delta: f32, polygon_name: String) {
         let current_frame = self.find_poly_frame(delta);