Function ImPlot_ColormapScale 

pub unsafe extern "C" fn ImPlot_ColormapScale(
    label: *const c_char,
    scale_min: f64,
    scale_max: f64,
    size: ImVec2_c,
    format: *const c_char,
    flags: ImPlotColormapScaleFlags,
    cmap: ImPlotColormap,
)