Add boilerplate for the analyzer widget

plugins/diopser/src/editor/analyzer.rs

@@ -26,7 +26,7 @@ use crate::params;
 use crate::spectrum::SpectrumOutput;
 
 /// A very abstract spectrum analyzer. This draws the magnitude spectrum's bins as vertical lines
-/// with the same distirubtion as the filter frequency parameter..
+/// with the same distribution as the filter frequency parameter..
 pub struct SpectrumAnalyzer {
     spectrum: Arc<Mutex<SpectrumOutput>>,
     sample_rate: Arc<AtomicF32>,

plugins/spectral_compressor/src/editor.rs

@@ -23,10 +23,12 @@ use nih_plug_vizia::{assets, create_vizia_editor, ViziaState, ViziaTheming};
 use serde::{Deserialize, Serialize};
 use std::sync::{Arc, Mutex};
 
+use self::analyzer::Analyzer;
 use self::mode_button::EditorModeButton;
 use crate::analyzer::AnalyzerData;
 use crate::{SpectralCompressor, SpectralCompressorParams};
 
+mod analyzer;
 mod mode_button;
 
 /// The entire GUI's width, in logical pixels.
@@ -81,6 +83,8 @@ pub(crate) fn create(editor_state: Arc<ViziaState>, editor_data: Data) -> Option
         assets::register_noto_sans_light(cx);
         assets::register_noto_sans_thin(cx);
 
+        cx.add_theme(include_str!("editor/theme.css"));
+
         editor_data.clone().build(cx);
 
         ResizeHandle::new(cx);
@@ -229,17 +233,12 @@ fn main_column(cx: &mut Context) {
 }
 
 fn analyzer_column(cx: &mut Context) {
-    HStack::new(cx, |cx| {
-        Label::new(cx, "When I grow up I want to be a spectrum analyzer!");
-    })
+    Analyzer::new(cx, Data::analyzer_data, Data::sample_rate)
         // These arbitrary 12 pixels are to align with the analyzer toggle botton
         .space(Pixels(12.0))
         .bottom(Pixels(12.0))
         .left(Pixels(2.0))
-    .top(Pixels(12.0))
-    .child_space(Stretch(1.0))
-    .border_width(Pixels(1.0))
-    .border_color(Color::black());
+        .top(Pixels(12.0));
 }
 
 fn make_column(cx: &mut Context, title: &str, contents: impl FnOnce(&mut Context)) {

plugins/spectral_compressor/src/editor/analyzer.rs

@@ -0,0 +1,96 @@
+// Spectral Compressor: an FFT based compressor
+// Copyright (C) 2021-2023 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use atomic_float::AtomicF32;
+use nih_plug_vizia::vizia::prelude::*;
+use nih_plug_vizia::vizia::vg;
+use std::sync::{Arc, Mutex};
+
+use crate::analyzer::AnalyzerData;
+
+/// A very spectrum analyzer with an overlay for the gain reduction.
+pub struct Analyzer {
+    analyzer_data: Arc<Mutex<triple_buffer::Output<AnalyzerData>>>,
+    sample_rate: Arc<AtomicF32>,
+}
+
+impl Analyzer {
+    /// Creates a new [`Analyzer`].
+    pub fn new<LAnalyzerData, LRate>(
+        cx: &mut Context,
+        analyzer_data: LAnalyzerData,
+        sample_rate: LRate,
+    ) -> Handle<Self>
+    where
+        LAnalyzerData: Lens<Target = Arc<Mutex<triple_buffer::Output<AnalyzerData>>>>,
+        LRate: Lens<Target = Arc<AtomicF32>>,
+    {
+        Self {
+            analyzer_data: analyzer_data.get(cx),
+            sample_rate: sample_rate.get(cx),
+        }
+        .build(
+            cx,
+            // This is an otherwise empty element only used for custom drawing
+            |_cx| (),
+        )
+    }
+}
+
+impl View for Analyzer {
+    fn element(&self) -> Option<&'static str> {
+        Some("analyzer")
+    }
+
+    fn draw(&self, cx: &mut DrawContext, canvas: &mut Canvas) {
+        let bounds = cx.bounds();
+        dbg!(bounds);
+        if bounds.w == 0.0 || bounds.h == 0.0 {
+            return;
+        }
+
+        // This only covers the style rules we're actually setting
+        let opacity = cx.opacity();
+        let border_width = match cx.border_width().unwrap_or_default() {
+            Units::Pixels(val) => val,
+            Units::Percentage(val) => bounds.w.min(bounds.h) * (val / 100.0),
+            _ => 0.0,
+        };
+        let mut border_color: vg::Color = cx.border_color().cloned().unwrap_or_default().into();
+        border_color.set_alphaf(border_color.a * opacity);
+
+        // TODO: Draw the spectrum analyzer
+
+        // Draw the border last
+        let mut path = vg::Path::new();
+        {
+            let x = bounds.x + border_width / 2.0;
+            let y = bounds.y + border_width / 2.0;
+            let w = bounds.w - border_width;
+            let h = bounds.h - border_width;
+            path.move_to(x, y);
+            path.line_to(x, y + h);
+            path.line_to(x + w, y + h);
+            path.line_to(x + w, y);
+            path.line_to(x, y);
+            path.close();
+        }
+
+        let mut paint = vg::Paint::color(border_color);
+        paint.set_line_width(border_width);
+        canvas.stroke_path(&mut path, &paint);
+    }
+}

plugins/spectral_compressor/src/editor/theme.css

@@ -0,0 +1,5 @@
+analyzer {
+  border-color: #0a0a0a;
+  border-width: 1px;
+  color: #0a0a0a;
+}