Method paint

Source/Panels/SpectrogramPanel/SpectrumComponent.cpp:101–202

}

void SpectrumComponent::paint(juce::Graphics& g)
{
    g.fillAll(juce::Colours::transparentBlack);

    auto width = getLocalBounds().getWidth();
    auto height = getLocalBounds().getHeight();
    auto mindB = -100.0f;
    auto maxdB = 0.0f;

    // mouseOver state is updated in paint(), which is more robust
    mouseOver = getLocalBounds().contains(getMouseXYRelative());
    maxDecibelValue = -100.0f;

    if (mouseOver && ! wasMouseOver)
    {
        isPeakLineVisible = true;
        resetPeakData();
    }
    wasMouseOver = mouseOver;

    juce::Path currentSpecPath, maxSpecPath;
    currentSpecPath.startNewSubPath(0, (float) height);
    if (mDrawPeak)
        maxSpecPath.startNewSubPath(0, (float) height);

    std::array<float, 1024> smoothedDisplayData;

    {
        juce::ScopedLock locker(dataLock);

        for (int i = 0; i < numberOfBins; ++i)
        {
            if (i == 0 || i == numberOfBins - 1)
                smoothedDisplayData[i] = displayData[i];
            else
                smoothedDisplayData[i] = (displayData[i - 1] + displayData[i] + displayData[i + 1]) / 3.0f;
        }

        for (int i = 1; i < numberOfBins; ++i)
        {
            // --- CRITICAL CHANGE HERE ---
            // Only capture new peaks when the mouse is hovering over the component.
            if (mDrawPeak && mouseOver && smoothedDisplayData[i] > maxData[i])
            {
                maxData[i] = smoothedDisplayData[i];
            }

            float currentDecibel = juce::Decibels::gainToDecibels(smoothedDisplayData[i] / (float) numberOfBins);
            float maxDecibel = juce::Decibels::gainToDecibels(maxData[i] / (float) numberOfBins);

            float yPercent = juce::jmap(juce::jlimit(mindB, maxdB, currentDecibel), mindB, maxdB, 0.0f, 1.0f);
            float yMaxPercent = juce::jmap(juce::jlimit(mindB, maxdB, maxDecibel), mindB, maxdB, 0.0f, 1.0f);
            double currentFreq = i * mBinWidth.load();
            float currentX = transformToLog(currentFreq) * width;
            float currentY = juce::jmap(yPercent, 0.0f, 1.0f, (float) height, 0.0f);
            float maxY = juce::jmap(yMaxPercent, 0.0f, 1.0f, (float) height, 0.0f);
            if (! std::isnan(currentX) && ! std::isinf(currentX))
            {