Method processHistogramsTab

source/Gui/StatisticsWindow.cpp:149–221

}

void StatisticsWindow::processHistogramsTab()
{
    if (!_histogramLiveStatistics.isDataAvailable()) {
        return;
    }
    ImPlot::PushStyleColor(ImPlotCol_FrameBg, (ImU32)ImColor(0.0f, 0.0f, 0.0f, ImGui::GetStyle().Alpha * 0.5 * Const::WindowAlpha));
    ImPlot::PushStyleColor(ImPlotCol_PlotBg, (ImU32)ImColor(0.0f, 0.0f, 0.0f, ImGui::GetStyle().Alpha * 0.5 * Const::WindowAlpha));
    auto const& histogramData = _histogramLiveStatistics.getData();
    auto maxNumObjects = 0;
    for (int i = 0; i < MAX_COLORS; ++i) {
        for (int j = 0; j < MAX_HISTOGRAM_SLOTS; ++j) {
            auto value = histogramData->numCellsByColorBySlot[i][j];
            maxNumObjects = std::max(maxNumObjects, value);
        }
    }

    //round maxNumObjects
    if (!_histogramUpperBound || toFloat(maxNumObjects) > *_histogramUpperBound * 0.9f || toFloat(maxNumObjects) < *_histogramUpperBound * 0.5f) {
        _histogramUpperBound = toFloat(maxNumObjects) * 1.3f;
    }

    ImPlot::SetNextAxesLimits(0, toFloat(MAX_HISTOGRAM_SLOTS), 0, *_histogramUpperBound, ImGuiCond_Always);

    auto getLabelString = [](int value) {
        if (value >= 1000) {
            return std::to_string(value / 1000) + "K";
        } else {
            return std::to_string(value);
        }
    };

    //y-ticks
    char const* labelsY[6];
    double positionsY[6];
    for (int i = 0; i < 5; ++i) {
        labelsY[i] = "";
        positionsY[i] = *_histogramUpperBound / 5 * i;
    }
    auto temp = getLabelString(maxNumObjects);
    labelsY[5] = temp.c_str();
    positionsY[5] = toFloat(maxNumObjects);

    //x-ticks
    char const* labelsX[5];
    std::string labelsX_temp[5];
    double positionsX[5];

    auto slotAge = histogramData->maxValue / MAX_HISTOGRAM_SLOTS;
    for (int i = 0; i < 5; ++i) {
        labelsX_temp[i] = getLabelString(slotAge * ((MAX_HISTOGRAM_SLOTS - 1) / 4) * i);
        labelsX[i] = labelsX_temp[i].c_str();
        positionsX[i] = toFloat(((MAX_HISTOGRAM_SLOTS - 1) / 4) * i);
    }


    //plot histogram
    if (ImPlot::BeginPlot("##Histograms", ImVec2(-1, -1))) {
        ImPlot::SetupAxisTicks(ImAxis_Y1, positionsY, 5, labelsY);