ImGui::PlotConfig conf;
conf.values.xs = x_data; // this line is optional
conf.values.ys = y_data;
conf.values.count = data_count;
conf.scale.min = -1;
conf.scale.max = 1;
conf.tooltip.show = true;
conf.tooltip.format = "x=%.2f, y=%.2f";
conf.grid_x.show = true;
conf.grid_y.show = true;
conf.frame_size = ImVec2(400, 400);
conf.line_thickness = 2.f;

ImGui::Plot("plot", conf);

constexpr size_t buf_size = 512;
static float x_data[buf_size];
static float y_data1[buf_size];
static float y_data2[buf_size];
static float y_data3[buf_size];

void generate_data() {
    constexpr float sampling_freq = 44100;
    constexpr float freq = 500;
    for (size_t i = 0; i < buf_size; ++i) {
        const float t = i / sampling_freq;
        x_data[i] = t;
        const float arg = 2 * M_PI * freq * t;
        y_data1[i] = sin(arg);
        y_data2[i] = y_data1[i] * -0.6 + sin(2 * arg) * 0.4;
        y_data3[i] = y_data2[i] * -0.6 + sin(3 * arg) * 0.4;
    }
}

void draw_multi_plot() {
    static const float* y_data[] = { y_data1, y_data2, y_data3 };
    static ImU32 colors[3] = { ImColor(0, 255, 0), ImColor(255, 0, 0), ImColor(0, 0, 255) };
    static uint32_t selection_start = 0, selection_length = 0;

    ImGui::Begin("Example plot", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
    // Draw first plot with multiple sources
    ImGui::PlotConfig conf;
    conf.values.xs = x_data;
    conf.values.count = buf_size;
    conf.values.ys_list = y_data; // use ys_list to draw several lines simultaneously
    conf.values.ys_count = 3;
    conf.values.colors = colors;
    conf.scale.min = -1;
    conf.scale.max = 1;
    conf.tooltip.show = true;
    conf.grid_x.show = true;
    conf.grid_x.size = 128;
    conf.grid_x.subticks = 4;
    conf.grid_y.show = true;
    conf.grid_y.size = 0.5f;
    conf.grid_y.subticks = 5;
    conf.selection.show = true;
    conf.selection.start = &selection_start;
    conf.selection.length = &selection_length;
    conf.frame_size = ImVec2(buf_size, 200);
    ImGui::Plot("plot1", conf);

    // Draw second plot with the selection
    // reset previous values
    conf.values.ys_list = nullptr;
    conf.selection.show = false;
    // set new ones
    conf.values.ys = y_data3;
    conf.values.offset = selection_start;
    conf.values.count = selection_length;
    conf.line_thickness = 2.f;
    ImGui::Plot("plot2", conf);

    ImGui::End();
}