smooth zooming

src/editor.rs

@@ -394,13 +394,23 @@ impl View for DelayGraph {
         let outline_width = draw_context.outline_width();
 
         // Compute the time scaling factor
-        let time_scaling_factor = Self::compute_time_scaling_factor(
+        let target_time_scaling_factor = Self::compute_time_scaling_factor(
             self.params.clone(),
             bounds.w,
             border_width,
             outline_width,
         );
 
+        let factor = 0.9;
+        let time_scaling_factor = (self
+            .params
+            .previous_time_scaling_factor
+            .load(Ordering::SeqCst)
+            * factor)
+            + (target_time_scaling_factor * (1.0 - factor));
+        self.params
+            .previous_time_scaling_factor
+            .store(time_scaling_factor, Ordering::SeqCst);
         // Draw components
         Self::draw_background(canvas, bounds, background_color);
         Self::draw_delay_times_as_lines(

src/lib.rs

@@ -147,6 +147,7 @@ pub struct Del2Params {
     max_tap_samples: Arc<AtomicU32>,
     #[persist = "first-note"]
     first_note: Arc<AtomicU8>,
+    previous_time_scaling_factor: Arc<AtomicF32>,
 
     /// A voice's gain. This can be polyphonically modulated.
     #[id = "gain"]
@@ -523,6 +524,7 @@ impl Del2Params {
             current_time: Arc::new(AtomicU32::new(0)),
             max_tap_samples: Arc::new(AtomicU32::new(0)),
             first_note: Arc::new(AtomicU8::new(NO_LEARNED_NOTE)),
+            previous_time_scaling_factor: Arc::new(AtomicF32::new(0.0)),
 
             gain: FloatParam::new(
                 "Gain",