Started refactoring gui creation to include drawing area

The drawing area will eventually be used for a debugging graph of the
frequency spectrum.

4 files changed, 194 insertions, 170 deletions

diff --git a/Cargo.lock b/Cargo.lock
index c105d18..b83c4e5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,21 +2,21 @@
 name = "rusty_microphone"
 version = "0.1.0"
 dependencies = [
+ "cairo-rs 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "dft 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "gdk 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gtk 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gtk 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "portaudio 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "atk-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -42,21 +42,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cairo-rs"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "c_vec 1.0.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "cairo-sys-rs 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cairo-sys-rs 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cairo-sys-rs"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -70,159 +70,159 @@ dependencies = [
 
 [[package]]
 name = "gdk"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cairo-rs 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gdk-pixbuf 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gdk-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gio 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pango 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cairo-rs 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-pixbuf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pango 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gdk-pixbuf"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gdk-pixbuf-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-pixbuf-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gdk-pixbuf-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gio-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gdk-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cairo-sys-rs 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gdk-pixbuf-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gio-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pango-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cairo-sys-rs 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-pixbuf-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pango-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gio"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "gio-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gio-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "glib"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "gio-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "glib-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gobject-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "gtk"
-version = "0.1.0"
+version = "0.1.1"
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 dependencies = [
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- "cairo-sys-rs 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
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- "gdk-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
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- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pango 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cairo-rs 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cairo-sys-rs 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-pixbuf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-pixbuf-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gtk-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pango 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "atk-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atk-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cairo-sys-rs 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
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- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pango-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cairo-sys-rs 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-pixbuf-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gdk-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gio-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pango-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libc"
-version = "0.2.17"
+version = "0.2.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -267,23 +267,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "pango"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "glib 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "pango-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pango-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "pango-sys"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "glib-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "gobject-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -298,38 +298,38 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "num 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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diff --git a/Cargo.toml b/Cargo.toml
index d580786..f259654 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,8 +6,8 @@ authors = ["Justin Worthe <justin.worthe@gmail.com>"]
 [dependencies]
 portaudio = "0.7.0"
 dft = "0.4.3"
-gdk = "0.5.0"
+cairo-rs = "0.1.1"
 
 [dependencies.gtk]
-version = "0.1.0"
+version = "0.1.1"
 features = ["v3_10"]
\ No newline at end of file
diff --git a/src/gui.rs b/src/gui.rs
index 5501e33..f116c45 100644
--- a/src/gui.rs
+++ b/src/gui.rs
@@ -8,26 +8,12 @@ use std::io::Write;
 use std::thread;
 use std::sync::mpsc::*;
 
-const GUI_XML: &'static str = r#"
-<interface>
-  <object class="GtkWindow" id="window">
-    <property name="title">Rusty Microphone</property>
-    <child>
-      <object class="GtkVBox">
-        <child>
-          <object class="GtkComboBoxText" id="dropdown">
-          </object>
-        </child>
-        <child>
-          <object class="GtkLabel" id="pitch-label">
-            <property name="label">Hello world</property>
-          </object>
-        </child>
-      </object>
-    </child>
-  </object>
-</interface>
-"#;
+struct RustyUi {
+    window: gtk::Window,
+    dropdown: gtk::ComboBoxText,
+    pitch_label: gtk::Label,
+    freq_chart: gtk::DrawingArea
+}
 
 struct ApplicationState {
     pa: pa::PortAudio,
@@ -46,55 +32,52 @@ pub fn start_gui() -> Result<(), String> {
     
     try!(gtk::init().map_err(|_| "Failed to initialize GTK."));
 
-    let gtk_builder = try!(create_window(microphones));
+    let ui = create_window(microphones);
 
-    connect_dropdown_choose_microphone(&gtk_builder, mic_sender, state.clone());
+    connect_dropdown_choose_microphone(&ui.dropdown, mic_sender, state.clone());
 
     let (pitch_sender, pitch_receiver) = channel();
+    let (freq_sender, freq_receiver) = channel();
     
-    start_processing_audio(mic_receiver, pitch_sender);
-        
-    let pitch_label: gtk::Label = gtk_builder.get_object("pitch-label").expect("GUI does not contain an object with id 'pitch-label'");
-    gtk::timeout_add(100, move || {
-        let mut pitch = None;
-        loop {
-            let next = pitch_receiver.try_recv().ok();
-            if next.is_none() {
-                break;
-            }
-            pitch = next;
-        }
-        match pitch {
-            Some(pitch) => {pitch_label.set_label(pitch.as_ref());},
-            None => {}
-        };
-        gtk::Continue(true)
-    });
+    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);
 
     gtk::main();
     Ok(())
 }
 
-fn create_window(microphones: Vec<(u32, String)>) -> Result<gtk::Builder, String> {
-    let gtk_builder = gtk::Builder::new_from_string(GUI_XML);
-    let window: gtk::Window = try!(
-        gtk_builder.get_object("window")
-                   .ok_or("GUI does not contain an object with id 'window'")
-    );
-    window.set_default_size(300, 300);
+fn create_window(microphones: Vec<(u32, String)>) -> RustyUi {
+    let window = gtk::Window::new(gtk::WindowType::Toplevel);
+    window.set_title("Rusty Microphone");
     window.connect_delete_event(|_, _| {
         gtk::main_quit();
         Inhibit(false)
     });
-    window.show_all();
 
-    let dropdown: gtk::ComboBoxText = try!(
-        gtk_builder.get_object("dropdown")
-                   .ok_or("GUI does not contain an object with id 'dropdown'")
-    );
+    let layout_box = gtk::Box::new(gtk::Orientation::Vertical, 5);
+    window.add(&layout_box);
+
+    let dropdown = gtk::ComboBoxText::new();
     set_dropdown_items(&dropdown, microphones);
+    layout_box.add(&dropdown);
+
+    let pitch_label = gtk::Label::new(None);
+    layout_box.add(&pitch_label);
 
-    Ok(gtk_builder)
+    let freq_chart = gtk::DrawingArea::new();
+    freq_chart.set_size_request(600, 400);
+    layout_box.add(&freq_chart);
+
+    window.show_all();
+    
+    RustyUi {
+        window: window,
+        dropdown: dropdown,
+        pitch_label: pitch_label,
+        freq_chart: freq_chart
+    }
 }
 
 fn set_dropdown_items(dropdown: &gtk::ComboBoxText, microphones: Vec<(u32, String)>) {
@@ -103,14 +86,16 @@ fn set_dropdown_items(dropdown: &gtk::ComboBoxText, microphones: Vec<(u32, Strin
     }
 }
 
-fn connect_dropdown_choose_microphone(gtk_builder: &gtk::Builder, mic_sender: Sender<Vec<f64>>, state: Rc<RefCell<ApplicationState>>) {
-    let dropdown: gtk::ComboBoxText = gtk_builder.get_object("dropdown").expect("GUI does not contain an object with id 'dropdown'");
+fn connect_dropdown_choose_microphone(dropdown: &gtk::ComboBoxText, mic_sender: Sender<Vec<f64>>, state: Rc<RefCell<ApplicationState>>) {
     dropdown.connect_changed(move |dropdown: &gtk::ComboBoxText| {
         match state.borrow_mut().pa_stream {
             Some(ref mut stream) => {stream.stop().ok();},
             _ => {}
         }
-        let selected_mic = dropdown.get_active_id().and_then(|id| id.parse().ok()).expect("Dropdown did not change to a valid value");
+        let selected_mic = match dropdown.get_active_id().and_then(|id| id.parse().ok()) {
+            Some(mic) => mic,
+            None => {return;}
+        };
         let stream = ::audio::start_listening(&state.borrow().pa, selected_mic, mic_sender.clone()).ok();
         if stream.is_none() {
             writeln!(io::stderr(), "Failed to open audio channel").ok();
@@ -119,10 +104,11 @@ fn connect_dropdown_choose_microphone(gtk_builder: &gtk::Builder, mic_sender: Se
     });
 }
 
-fn start_processing_audio(mic_receiver: Receiver<Vec<f64>>, pitch_sender: Sender<String>) {
+fn start_processing_audio(mic_receiver: Receiver<Vec<f64>>, pitch_sender: Sender<String>, freq_sender: Sender<Vec<::transforms::FrequencyBucket>>) {
     thread::spawn(move || {
         for samples in mic_receiver {
             let frequency_domain = ::transforms::fft(samples, 44100.0);
+            freq_sender.send(frequency_domain.clone());
             let fundamental = ::transforms::find_fundamental_frequency(&frequency_domain);
             let pitch = match fundamental {
                 Some(fundamental) => ::transforms::hz_to_pitch(fundamental),
@@ -132,3 +118,41 @@ 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>) {
+    gtk::timeout_add(100, move || {
+        let mut pitch = None;
+        loop {
+            let next = pitch_receiver.try_recv().ok();
+            if next.is_none() {
+                break;
+            }
+            pitch = next;
+        }
+        match pitch {
+            Some(pitch) => {pitch_label.set_label(pitch.as_ref());},
+            None => {}
+        };
+        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();
+        }
+
+        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);
+        context.stroke();
+        
+        gtk::Inhibit(false)
+    });
+}
diff --git a/src/lib.rs b/src/lib.rs
index b361502..45b1f91 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,5 @@
 extern crate gtk;
-extern crate gdk;
+extern crate cairo;
 extern crate portaudio;
 
 pub mod transforms;