noise_slider: added noise_slider

noise_slider/Source/MainComponent.cpp

@@ -0,0 +1,53 @@
+#include "../JuceLibraryCode/JuceHeader.h"
+
+class MainContentComponent : public AudioAppComponent {
+public:
+    MainContentComponent() {
+        setSize(800, 600);
+        setAudioChannels(2, 2);
+        random = Random();
+        levelSlider.setRange (0.0, 0.25);
+        levelSlider.setTextBoxStyle (Slider::TextBoxRight, false, 100, 20);
+        levelLabel.setText ("Level", dontSendNotification);
+        
+        addAndMakeVisible (levelSlider);
+        addAndMakeVisible (levelLabel);
+    }
+
+    ~MainContentComponent() {
+        shutdownAudio();
+    }
+
+    void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override {}
+
+    void getNextAudioBlock (const AudioSourceChannelInfo& buf) override {
+        const float l = levelSlider.getValue();
+        const float ls = l * 2.0f;
+        
+        for (int c = 0; c < buf.buffer->getNumChannels(); ++c) {
+            float* const b = buf.buffer->getWritePointer(c, buf.startSample);
+            
+            for (int s = 0; s < buf.numSamples; ++s) b[s] = random.nextFloat() * ls * l;
+        }
+    }
+
+    void releaseResources() override{}
+
+    void paint (Graphics& g) override {
+        g.fillAll (getLookAndFeel().findColour (ResizableWindow::backgroundColourId));
+    }
+
+    void resized() override {
+        levelLabel.setBounds (10, 10, 90, 20);
+        levelSlider.setBounds (100, 10, getWidth() - 110, 20);
+    }
+
+
+private:
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainContentComponent)
+    Random random;
+    Slider levelSlider;
+    Label  levelLabel;
+};
+
+Component* createMainContentComponent() { return new MainContentComponent(); }