Create fully-functioning and somewhat good looking volume visualiser

Source/PluginEditor.cpp

@@ -56,7 +56,9 @@ void OscirenderAudioProcessorEditor::paint(juce::Graphics& g)
 
 void OscirenderAudioProcessorEditor::resized() {
     auto area = getLocalBounds();
-    volume.setBounds(area.removeFromLeft(50));
+    area.removeFromLeft(5);
+    auto volumeArea = area.removeFromLeft(30);
+    volume.setBounds(volumeArea.withSizeKeepingCentre(volumeArea.getWidth(), std::min(volumeArea.getHeight(), 300)));
     auto sections = 2;
     int index = audioProcessor.getCurrentFileIndex();
     if (index != -1) {

Source/PluginProcessor.cpp

@@ -444,9 +444,12 @@ void OscirenderAudioProcessor::processBlock (juce::AudioBuffer<float>& buffer, j
 		x = channels.x;
 		y = channels.y;
 
-        // clip to -1.0 to 1.0
-        x = std::max(-1.0, std::min(1.0, x));
-        y = std::max(-1.0, std::min(1.0, y));
+        x *= volume;
+        y *= volume;
+
+        // clip
+        x = std::max(-threshold, std::min(threshold.load(), x));
+        y = std::max(-threshold, std::min(threshold.load(), y));
         
         if (totalNumOutputChannels >= 2) {
 			channelData[0][sample] = x;
@@ -475,19 +478,6 @@ void OscirenderAudioProcessor::processBlock (juce::AudioBuffer<float>& buffer, j
             }
         }
 	}
-
-	juce::MidiBuffer processedMidi;
-    
-    for (const auto metadata : midiMessages) {
-        auto message = metadata.getMessage();
-        const auto time = metadata.samplePosition;
-        
-        if (message.isNoteOn()) {
-            message = juce::MidiMessage::noteOn(message.getChannel(), message.getNoteNumber(), (juce::uint8)noteOnVel);
-        }
-        processedMidi.addEvent(message, time);
-    }
-	midiMessages.swapWith(processedMidi);
 }
 
 void OscirenderAudioProcessor::incrementShapeDrawing() {

Source/PluginProcessor.h

@@ -64,10 +64,11 @@ public:
     void getStateInformation (juce::MemoryBlock& destData) override;
     void setStateInformation (const void* data, int sizeInBytes) override;
 
-    float noteOnVel;
-	float frequency = 440.0f;
+	std::atomic<float> frequency = 440.0f;
+    std::atomic<double> volume = 1.0;
+    std::atomic<double> threshold = 1.0;
 
-    double currentSampleRate = 0.0;
+    std::atomic<double> currentSampleRate = 0.0;
 
     juce::SpinLock effectsLock;
 	std::vector<std::shared_ptr<Effect>> allEffects;

Source/components/VolumeComponent.cpp

@@ -11,7 +11,10 @@ VolumeComponent::VolumeComponent(OscirenderAudioProcessor& p) : audioProcessor(p
     volumeSlider.setColour(juce::Slider::ColourIds::backgroundColourId, juce::Colours::transparentWhite);
     volumeSlider.setColour(juce::Slider::ColourIds::trackColourId, juce::Colours::transparentWhite);
     volumeSlider.setOpaque(false);
-    volumeSlider.setRange(0, 1, 0.001);
+    volumeSlider.setRange(0, 2, 0.001);
+    volumeSlider.setValue(1);
+    volumeSlider.setLookAndFeel(&thumbRadiusLookAndFeel);
+    volumeSlider.setColour(juce::Slider::ColourIds::thumbColourId, juce::Colours::black);
 
     addAndMakeVisible(thresholdSlider);
     thresholdSlider.setSliderStyle(juce::Slider::SliderStyle::LinearVertical);
@@ -20,6 +23,17 @@ VolumeComponent::VolumeComponent(OscirenderAudioProcessor& p) : audioProcessor(p
     thresholdSlider.setColour(juce::Slider::ColourIds::trackColourId, juce::Colours::transparentWhite);
     thresholdSlider.setOpaque(false);
     thresholdSlider.setRange(0, 1, 0.001);
+    thresholdSlider.setValue(1);
+    thresholdSlider.setLookAndFeel(&thresholdLookAndFeel);
+    thresholdSlider.setColour(juce::Slider::ColourIds::thumbColourId, juce::Colours::black);
+
+    volumeSlider.onValueChange = [this]() {
+        audioProcessor.volume = volumeSlider.getValue();
+    };
+
+    thresholdSlider.onValueChange = [this]() {
+        audioProcessor.threshold = thresholdSlider.getValue();
+    };
 }
 
 VolumeComponent::~VolumeComponent() {
@@ -30,6 +44,8 @@ VolumeComponent::~VolumeComponent() {
 void VolumeComponent::paint(juce::Graphics& g) {
     auto r = getLocalBounds().toFloat();
     r.removeFromRight(r.getWidth() / 2);
+    r.removeFromTop(volumeSlider.getLookAndFeel().getSliderThumbRadius(volumeSlider));
+    r.removeFromBottom(volumeSlider.getLookAndFeel().getSliderThumbRadius(volumeSlider));
 
     g.setColour(juce::Colours::white);
     g.fillRect(r);
@@ -43,17 +59,19 @@ void VolumeComponent::paint(juce::Graphics& g) {
     auto leftRegion = leftRect;
     auto rightRegion = rightRect;
 
-    g.setGradientFill(juce::ColourGradient(juce::Colours::green, 0, leftRect.getBottom(), juce::Colours::red, 0, leftRect.getY(), false));
+    g.setGradientFill(juce::ColourGradient(juce::Colour(0xff00ff00), 0, leftRect.getBottom(), juce::Colours::red, 0, leftRect.getY(), false));
     g.fillRect(leftRect.removeFromBottom(leftVolumeHeight));
 
-    g.setGradientFill(juce::ColourGradient(juce::Colours::green, 0, rightRect.getBottom(), juce::Colours::red, 0, rightRect.getY(), false));
+    g.setGradientFill(juce::ColourGradient(juce::Colour(0xff00ff00), 0, rightRect.getBottom(), juce::Colours::red, 0, rightRect.getY(), false));
     g.fillRect(rightRect.removeFromBottom(rightVolumeHeight));
 
-    // draw average volume as new rectangles on each channel 10 pixels tall
-    g.setColour(juce::Colours::black);
-    g.fillRect(leftRegion.getX(), leftRegion.getBottom() - (avgLeftVolume * channelHeight), leftRegion.getWidth(), 5.0f);
-    g.fillRect(rightRegion.getX(), rightRegion.getBottom() - (avgRightVolume * channelHeight), rightRegion.getWidth(), 5.0f);
+    auto barWidth = 5.0f;
 
+    g.setColour(juce::Colours::black);
+    g.fillRect(leftRegion.getX(), leftRegion.getBottom() - (avgLeftVolume * channelHeight) - barWidth / 2, leftRegion.getWidth(), barWidth);
+    g.fillRect(rightRegion.getX(), rightRegion.getBottom() - (avgRightVolume * channelHeight) - barWidth / 2, rightRegion.getWidth(), barWidth);
+
+    g.fillRect(leftRegion.getX(), rightRegion.getBottom() - (thresholdSlider.getValue() * channelHeight) - barWidth / 2, leftRegion.getWidth() + rightRegion.getWidth(), barWidth);
 }
 
 void VolumeComponent::timerCallback() {

Source/components/VolumeComponent.h

@@ -4,6 +4,60 @@
 #include "../concurrency/BufferConsumer.h"
 #include "../PluginProcessor.h"
 
+class ThumbRadiusLookAndFeel : public juce::LookAndFeel_V4 {
+public:
+    ThumbRadiusLookAndFeel(int thumbRadius) : thumbRadius(thumbRadius) {}
+
+    int getSliderThumbRadius(juce::Slider& slider) override {
+        return juce::jmin(thumbRadius, slider.isHorizontal() ? slider.getHeight() : slider.getWidth());
+    }
+
+private:
+    int thumbRadius = 12;
+};
+
+// this is for a vertical slider
+class ThresholdLookAndFeel : public ThumbRadiusLookAndFeel {
+public:
+    ThresholdLookAndFeel(int thumbRadius) : ThumbRadiusLookAndFeel(thumbRadius) {}
+
+    void drawLinearSliderThumb(juce::Graphics& g, int x, int y, int width, int height, float sliderPos, float minSliderPos, float maxSliderPos, const juce::Slider::SliderStyle style, juce::Slider& slider) override {
+        float kx = (float) x + (float) width * 0.5f;
+        float ky = sliderPos;
+
+        auto outlineThickness = slider.isEnabled() ? 0.8f : 0.3f;
+        auto sliderRadius = (float) (getSliderThumbRadius(slider) - 2);
+        auto diameter = sliderRadius * 2.0f;
+        auto halfThickness = outlineThickness * 0.5f;
+
+        auto isDownOrDragging = slider.isEnabled() && (slider.isMouseOverOrDragging() || slider.isMouseButtonDown());
+
+        auto knobColour = slider.findColour(juce::Slider::thumbColourId)
+            .withMultipliedSaturation((slider.hasKeyboardFocus (false) || isDownOrDragging) ? 1.3f : 0.9f)
+            .withMultipliedAlpha(slider.isEnabled() ? 1.0f : 0.7f);
+
+        y = (int) (ky - sliderRadius);
+
+        // draw triangle that points left
+        juce::Path p;
+        p.addTriangle(
+            x + diameter, y,
+            x + diameter, y + diameter,
+            x, ky
+        );
+
+        g.setColour(knobColour);
+        g.fillPath(p);
+
+        g.setColour(knobColour.brighter());
+        g.strokePath(p, juce::PathStrokeType(outlineThickness));
+    }
+
+    void drawLinearSlider(juce::Graphics& g, int x, int y, int width, int height, float sliderPos, float minSliderPos, float maxSliderPos, const juce::Slider::SliderStyle style, juce::Slider& slider) override {
+        drawLinearSliderThumb(g, x, y, width, height, sliderPos, minSliderPos, maxSliderPos, style, slider);
+    }
+};
+
 class VolumeComponent : public juce::Component, public juce::Timer, public juce::Thread {
 public:
 	VolumeComponent(OscirenderAudioProcessor& p);
@@ -22,8 +76,10 @@ private:
 	std::atomic<float> rightVolume = 0;
 	std::atomic<float> avgLeftVolume = 0;
 	std::atomic<float> avgRightVolume = 0;
-
-	juce::Slider volumeSlider;
+	
+    ThumbRadiusLookAndFeel thumbRadiusLookAndFeel{20};
+    juce::Slider volumeSlider;
+    ThresholdLookAndFeel thresholdLookAndFeel{20};
 	juce::Slider thresholdSlider;
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(VolumeComponent)