Function Demo_Heatmaps

Source/3rdParty/implot/implot_demo.cpp:752–816

//-----------------------------------------------------------------------------

void Demo_Heatmaps() {
    IMGUI_DEMO_MARKER("Plots/Heatmaps");
    static float values1[7][7]  = {{0.8f, 2.4f, 2.5f, 3.9f, 0.0f, 4.0f, 0.0f},
                                    {2.4f, 0.0f, 4.0f, 1.0f, 2.7f, 0.0f, 0.0f},
                                    {1.1f, 2.4f, 0.8f, 4.3f, 1.9f, 4.4f, 0.0f},
                                    {0.6f, 0.0f, 0.3f, 0.0f, 3.1f, 0.0f, 0.0f},
                                    {0.7f, 1.7f, 0.6f, 2.6f, 2.2f, 6.2f, 0.0f},
                                    {1.3f, 1.2f, 0.0f, 0.0f, 0.0f, 3.2f, 5.1f},
                                    {0.1f, 2.0f, 0.0f, 1.4f, 0.0f, 1.9f, 6.3f}};
    static float scale_min       = 0;
    static float scale_max       = 6.3f;
    static const char* xlabels[] = {"C1","C2","C3","C4","C5","C6","C7"};
    static const char* ylabels[] = {"R1","R2","R3","R4","R5","R6","R7"};

    static ImPlotColormap map = ImPlotColormap_Viridis;
    if (ImPlot::ColormapButton(ImPlot::GetColormapName(map),ImVec2(225,0),map)) {
        map = (map + 1) % ImPlot::GetColormapCount();
        // We bust the color cache of our plots so that item colors will
        // resample the new colormap in the event that they have already
        // been created. See documentation in implot.h.
        BustColorCache("##Heatmap1");
        BustColorCache("##Heatmap2");
    }

    ImGui::SameLine();
    ImGui::LabelText("##Colormap Index", "%s", "Change Colormap");
    ImGui::SetNextItemWidth(225);
    ImGui::DragFloatRange2("Min / Max",&scale_min, &scale_max, 0.01f, -20, 20);

    static ImPlotHeatmapFlags hm_flags = 0;

    ImGui::CheckboxFlags("Column Major", (unsigned int*)&hm_flags, ImPlotHeatmapFlags_ColMajor);

    static ImPlotAxisFlags axes_flags = ImPlotAxisFlags_Lock | ImPlotAxisFlags_NoGridLines | ImPlotAxisFlags_NoTickMarks;

    ImPlot::PushColormap(map);

    if (ImPlot::BeginPlot("##Heatmap1",ImVec2(ImGui::GetTextLineHeight()*14,ImGui::GetTextLineHeight()*14),ImPlotFlags_NoLegend|ImPlotFlags_NoMouseText)) {
        ImPlot::SetupAxes(nullptr, nullptr, axes_flags, axes_flags);
        ImPlot::SetupAxisTicks(ImAxis_X1,0 + 1.0/14.0, 1 - 1.0/14.0, 7, xlabels);
        ImPlot::SetupAxisTicks(ImAxis_Y1,1 - 1.0/14.0, 0 + 1.0/14.0, 7, ylabels);
        ImPlot::PlotHeatmap("heat",values1[0],7,7,scale_min,scale_max,"%g",ImPlotPoint(0,0),ImPlotPoint(1,1), {ImPlotProp_Flags, hm_flags});
        ImPlot::EndPlot();
    }
    ImGui::SameLine();
    ImPlot::ColormapScale("##HeatScale",scale_min, scale_max, ImVec2(60,225));

    ImGui::SameLine();

    const int size = 80;
    static double values2[size*size];
    srand((unsigned int)(ImGui::GetTime()*1000000));
    for (int i = 0; i < size*size; ++i)
        values2[i] = RandomRange(0.0,1.0);

    if (ImPlot::BeginPlot("##Heatmap2",ImVec2(ImGui::GetTextLineHeight()*14,ImGui::GetTextLineHeight()*14))) {
        ImPlot::SetupAxes(nullptr, nullptr, ImPlotAxisFlags_NoDecorations, ImPlotAxisFlags_NoDecorations);
        ImPlot::SetupAxesLimits(-1,1,-1,1);