87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
#include "../JuceLibraryCode/JuceHeader.h"
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class MainContentComponent : public AudioAppComponent,
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public Slider::Listener {
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public:
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MainContentComponent() : samplerate(0.0),
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angle(0.0),
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delta(0.0),
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current(500.0),
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target(current) {
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addAndMakeVisible(freqslider);
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freqslider.setRange(50.0, 5000.0);
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freqslider.setSkewFactorFromMidPoint(500.0);
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freqslider.setValue(current, dontSendNotification);
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freqslider.addListener(this);
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setSize(800, 600);
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setAudioChannels(0, 1);
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}
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~MainContentComponent() {
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shutdownAudio();
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}
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void prepareToPlay (int, double sampleRate) override {
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samplerate = sampleRate;
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updateDelta();
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}
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void getNextAudioBlock(const AudioSourceChannelInfo& buf) override {
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const float level = 0.125f;
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float* const buffer = buf.buffer->getWritePointer(0, buf.startSample);
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const double lt = target;
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if (lt != current) {
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const double i = (lt - current) / buf.numSamples;
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for (int s = 0; s < buf.numSamples; ++s) {
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const float c = (float) std::sin (angle);
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current += i;
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updateDelta();
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angle += delta;
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buffer[s] = c * level;
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}
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current = lt;
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} else {
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for (int s = 0; s < buf.numSamples; ++s) {
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const float c = (float) std::sin (angle);
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angle += delta;
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buffer[s] = c* level;
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}
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}
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}
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void updateDelta() {
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const double c = freqslider.getValue() / samplerate;
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delta = c * 2.0 * double_Pi;
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}
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void sliderValueChanged(Slider* s) override {
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if (s == &freqslider) target = freqslider.getValue();
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}
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void releaseResources() override {}
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void paint (Graphics& g) override {
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g.fillAll (getLookAndFeel().findColour(ResizableWindow::backgroundColourId));
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}
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void resized() override{
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freqslider.setBounds(10, 10, getWidth() - 10, 20);
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}
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private:
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainContentComponent)
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double samplerate, angle, delta;
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double current, target;
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Slider freqslider;
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};
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Component* createMainContentComponent() { return new MainContentComponent(); }
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