Function ColormapButton

src/external/imgui/implot.cpp:4747–4774

}

bool ColormapButton(const char* label, const ImVec2& size_arg, ImPlotColormap cmap) {
    ImGuiContext &G      = *GImGui;
    const ImGuiStyle& style = G.Style;
    ImGuiWindow * Window = G.CurrentWindow;
    if (Window->SkipItems)
        return false;
    ImPlotContext& gp = *GImPlot;
    cmap = cmap == IMPLOT_AUTO ? gp.Style.Colormap : cmap;
    IM_ASSERT_USER_ERROR(cmap >= 0 && cmap < gp.ColormapData.Count, "Invalid colormap index!");
    const ImU32* keys  = gp.ColormapData.GetKeys(cmap);
    const int    count = gp.ColormapData.GetKeyCount(cmap);
    const bool   qual  = gp.ColormapData.IsQual(cmap);
    const ImVec2 pos  = ImGui::GetCurrentWindow()->DC.CursorPos;
    const ImVec2 label_size = ImGui::CalcTextSize(label, nullptr, true);
    ImVec2 size = ImGui::CalcItemSize(size_arg, label_size.x + style.FramePadding.x * 2.0f, label_size.y + style.FramePadding.y * 2.0f);
    const ImRect rect = ImRect(pos.x,pos.y,pos.x+size.x,pos.y+size.y);
    RenderColorBar(keys,count,*ImGui::GetWindowDrawList(),rect,false,false,!qual);
    const ImU32 text = CalcTextColor(gp.ColormapData.LerpTable(cmap,G.Style.ButtonTextAlign.x));
    ImGui::PushStyleColor(ImGuiCol_Button,IM_COL32_BLACK_TRANS);
    ImGui::PushStyleColor(ImGuiCol_ButtonHovered,ImVec4(1,1,1,0.1f));
    ImGui::PushStyleColor(ImGuiCol_ButtonActive,ImVec4(1,1,1,0.2f));
    ImGui::PushStyleColor(ImGuiCol_Text,text);
    ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding,0);
    const bool pressed = ImGui::Button(label,size);
    ImGui::PopStyleColor(4);
    ImGui::PopStyleVar(1);
    return pressed;
}

//-----------------------------------------------------------------------------
// [Section] Miscellaneous