From 5f68c90c23d0301b80f44ea2d910e931557eea8d Mon Sep 17 00:00:00 2001
From: Justin Worthe <justin.worthe@gmail.com>
Date: Sat, 14 Jan 2017 23:09:44 +0200
Subject: Added graph drawing of FFT

---
 src/gui.rs | 85 +++++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 59 insertions(+), 26 deletions(-)

(limited to 'src')

diff --git a/src/gui.rs b/src/gui.rs
index 5591cd7..aa4d817 100644
--- a/src/gui.rs
+++ b/src/gui.rs
@@ -17,32 +17,35 @@ struct RustyUi {
 
 struct ApplicationState {
     pa: pa::PortAudio,
-    pa_stream: Option<pa::Stream<pa::NonBlocking, pa::Input<f32>>>
+    pa_stream: Option<pa::Stream<pa::NonBlocking, pa::Input<f32>>>,
+    freq_spectrum: Vec<::transforms::FrequencyBucket>,
+    ui: RustyUi
 }
 
 pub fn start_gui() -> Result<(), String> {
     let pa = try!(::audio::init().map_err(|e| e.to_string()));
     let microphones = try!(::audio::get_device_list(&pa).map_err(|e| e.to_string()));
 
-    let (mic_sender, mic_receiver) = channel();
+    try!(gtk::init().map_err(|_| "Failed to initialize GTK."));
+
     let state = Rc::new(RefCell::new(ApplicationState {
         pa: pa,
-        pa_stream: None
+        pa_stream: None,
+        freq_spectrum: Vec::new(),
+        ui: create_window(microphones)
     }));
-    
-    try!(gtk::init().map_err(|_| "Failed to initialize GTK."));
-
-    let ui = create_window(microphones);
-
-    connect_dropdown_choose_microphone(&ui.dropdown, mic_sender, state.clone());
 
+    //let ui = create_window(microphones);
+    
+    let (mic_sender, mic_receiver) = channel();
     let (pitch_sender, pitch_receiver) = channel();
     let (freq_sender, freq_receiver) = channel();
+
+    connect_dropdown_choose_microphone(mic_sender, state.clone());
     
     start_processing_audio(mic_receiver, pitch_sender, freq_sender);
-    
-    setup_pitch_label_callbacks(ui.pitch_label, pitch_receiver);
-    setup_drawing_area_callbacks(ui.freq_chart, freq_receiver);
+    setup_pitch_label_callbacks(pitch_receiver, state.clone());
+    setup_drawing_area_callbacks(freq_receiver, state.clone());
 
     gtk::main();
     Ok(())
@@ -86,7 +89,9 @@ fn set_dropdown_items(dropdown: &gtk::ComboBoxText, microphones: Vec<(u32, Strin
     }
 }
 
-fn connect_dropdown_choose_microphone(dropdown: &gtk::ComboBoxText, mic_sender: Sender<Vec<f64>>, state: Rc<RefCell<ApplicationState>>) {
+fn connect_dropdown_choose_microphone(mic_sender: Sender<Vec<f64>>, state: Rc<RefCell<ApplicationState>>) {
+    let outer_state = state.clone();
+    let ref dropdown = outer_state.borrow().ui.dropdown;
     dropdown.connect_changed(move |dropdown: &gtk::ComboBoxText| {
         match state.borrow_mut().pa_stream {
             Some(ref mut stream) => {stream.stop().ok();},
@@ -119,7 +124,7 @@ fn start_processing_audio(mic_receiver: Receiver<Vec<f64>>, pitch_sender: Sender
     });
 }
 
-fn setup_pitch_label_callbacks(pitch_label: gtk::Label, pitch_receiver: Receiver<String>) {
+fn setup_pitch_label_callbacks(pitch_receiver: Receiver<String>, state: Rc<RefCell<ApplicationState>>) {
     gtk::timeout_add(100, move || {
         let mut pitch = None;
         loop {
@@ -130,29 +135,57 @@ fn setup_pitch_label_callbacks(pitch_label: gtk::Label, pitch_receiver: Receiver
             pitch = next;
         }
         match pitch {
-            Some(pitch) => {pitch_label.set_label(pitch.as_ref());},
+            Some(pitch) => {state.borrow().ui.pitch_label.set_label(pitch.as_ref());},
             None => {}
         };
+        state.borrow().ui.freq_chart.queue_draw();
         gtk::Continue(true)
     });
 }
 
-fn setup_drawing_area_callbacks(canvas: gtk::DrawingArea, freq_receiver: Receiver<Vec<::transforms::FrequencyBucket>>) {
-    canvas.connect_draw(move |ref canvas, ref context| {
-        let mut last_signal = Vec::new();
-        loop {
-            let next = freq_receiver.try_recv().ok();
-            if next.is_none() {
-                break;
-            }
-            last_signal = next.unwrap();
-        }
+fn setup_drawing_area_callbacks(spectrum_receiver: Receiver<Vec<::transforms::FrequencyBucket>>, state: Rc<RefCell<ApplicationState>>) {
+    setup_frequency_spectrum_callback(spectrum_receiver, state.clone());
 
+    let outer_state = state.clone();
+    let ref canvas = outer_state.borrow().ui.freq_chart;
+    canvas.connect_draw(move |ref canvas, ref context| {
+        let ref spectrum = state.borrow().freq_spectrum;
+        let width = canvas.get_allocated_width() as f64;
+        let height = canvas.get_allocated_height() as f64;
+        let max = spectrum.iter().map(|x| x.intensity).fold(0.0, |max, x| if max > x { max } else { x });
+        let len = spectrum.len() as f64;
+        
         context.new_path();
         context.move_to(0.0, 0.0);
-        context.line_to(canvas.get_allocated_width() as f64, canvas.get_allocated_height() as f64);
+        
+        for (i, bucket) in spectrum.iter().enumerate() {
+            let x = i as f64 * width / len;
+            let y = height - (bucket.intensity * height / max);
+            context.line_to(x, y);
+        }
+        
         context.stroke();
         
         gtk::Inhibit(false)
     });
 }
+
+fn setup_frequency_spectrum_callback(spectrum_receiver: Receiver<Vec<::transforms::FrequencyBucket>>, state: Rc<RefCell<ApplicationState>>) {
+    gtk::timeout_add(100, move || {
+        let mut spectrum = None;
+        loop {
+            let next = spectrum_receiver.try_recv().ok();
+            if next.is_none() {
+                break;
+            }
+            spectrum = next;
+        }
+        match spectrum {
+            Some(spectrum) => {
+                state.borrow_mut().freq_spectrum = spectrum;
+            },
+            None => {}
+        };
+        gtk::Continue(true)
+    });
+}
-- 
cgit v1.2.3