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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| #include "FreqResponseComponent.hpp" | ||
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| FreqResponseComponent::FreqResponseComponent( | ||
| const BiquadFilter& filter, juce::AudioParameterInt* filterParam) | ||
| : filter(filter), filterParam(filterParam) { | ||
| setSize(400, 400); | ||
| } | ||
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| constexpr float a = std::log10(MAX_FREQ), b = std::log10(40); | ||
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| constexpr float MAX_DB = 40; | ||
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| void FreqResponseComponent::paint(juce::Graphics& g) { | ||
| using namespace std::complex_literals; | ||
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| BiquadFilterCoefficients c = filter.getCoeffs(); | ||
| int filters = *filterParam; | ||
| int w = this->getWidth(), h = this->getHeight(); | ||
| if (w <= 1) return; | ||
| if (c != this->lastCoeffs || filters != this->lastFilters) { | ||
| for (int i = 0; i < w; i++) { | ||
| float f = std::pow(10, i * (a - b) / (w - 1) + b); | ||
| std::complex<float> z = std::__complex_exp<float>( | ||
| 1if * juce::MathConstants<float>::pi * f / | ||
| MAX_FREQ), | ||
| z1 = 1.f / z, z2 = 1.f / (z * z); | ||
| values[i] = | ||
| (c.b0 + c.b1 * z1 + c.b2 * z2) / (c.a0 + c.a1 * z1 + c.a2 * z2); | ||
| if (filters > 1) values[i] = std::pow(values[i], filters); | ||
| } | ||
| this->lastFilters = filters; | ||
| this->lastCoeffs = c; | ||
| } | ||
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| g.fillAll(juce::Colours::black); | ||
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| juce::Path p, p2; | ||
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| p.preallocateSpace(w); | ||
| p.startNewSubPath({-200, h / 2.f}); | ||
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| p2.preallocateSpace(w); | ||
| p2.startNewSubPath({-200, h / 2.f}); | ||
| for (int x = 0; x < w; x++) { | ||
| float mag = 20 * std::log10(std::abs(values[x])), | ||
| phase = std::arg(values[x]); | ||
| int y = h / 2 - h * mag / MAX_DB / 2, | ||
| y2 = h / 2 - h * phase / juce::MathConstants<float>::pi / 2; | ||
| if (values[x].real() == 0 && values[x].imag() == 0) { | ||
| y = h + 20; | ||
| y2 = h + 20; | ||
| } | ||
| p.lineTo(x, y); | ||
| p2.lineTo(x, y2); | ||
| } | ||
| p.lineTo(w + 200, h / 2.f); | ||
| p.lineTo(w, h + 20); | ||
| p.lineTo(-200, h + 20); | ||
| p.closeSubPath(); | ||
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| p2.lineTo(w + 200, h / 2.f); | ||
| p2.lineTo(w, h + 20); | ||
| p2.lineTo(-200, h + 20); | ||
| p2.closeSubPath(); | ||
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| g.setColour(juce::Colours::orange); | ||
| g.fillPath(p); | ||
| g.setColour(juce::Colours::orange.darker()); | ||
| g.strokePath(p, juce::PathStrokeType(5), | ||
| juce::AffineTransform().withAbsoluteTranslation(0, 3)); | ||
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| g.setColour(juce::Colours::cyan.withAlpha(.3f)); | ||
| g.fillPath(p2); | ||
| g.setColour(juce::Colours::cyan.darker().withAlpha(.3f)); | ||
| g.strokePath(p2, juce::PathStrokeType(5), | ||
| juce::AffineTransform().withAbsoluteTranslation(0, 3)); | ||
| } | ||
|
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||
| void FreqResponseComponent::resized() {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| #pragma once | ||
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| #include <JuceHeader.h> | ||
| #include <complex> | ||
| #include <cmath> | ||
| #include "BiquadFilter.hpp" | ||
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| constexpr int MAX_WIDTH = 400; | ||
| constexpr float MAX_FREQ = 22000; | ||
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| class FreqResponseComponent : public juce::Component { | ||
| public: | ||
| FreqResponseComponent(const BiquadFilter& filter, | ||
| juce::AudioParameterInt* filterParam); | ||
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| void paint(juce::Graphics& g) override; | ||
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| void resized() override; | ||
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| private: | ||
| const BiquadFilter& filter; | ||
| juce::AudioParameterInt* filterParam; | ||
|
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| BiquadFilterCoefficients lastCoeffs = {}; | ||
| int lastFilters = 0; | ||
| std::complex<float> values[MAX_WIDTH] = {}; | ||
| }; |
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