Function DragRect

Source/3rdParty/implot/implot.cpp:4126–4270

}

bool DragRect(int n_id, double* x_min, double* y_min, double* x_max, double* y_max, const ImVec4& col, ImPlotDragToolFlags flags, bool* out_clicked, bool* out_hovered, bool* out_held) {
    ImGui::PushID("#IMPLOT_DRAG_RECT");
    IM_ASSERT_USER_ERROR(GImPlot->CurrentPlot != nullptr, "DragRect() needs to be called between BeginPlot() and EndPlot()!");
    SetupLock();

    if (!ImHasFlag(flags,ImPlotDragToolFlags_NoFit) && FitThisFrame()) {
        FitPoint(ImPlotPoint(*x_min,*y_min));
        FitPoint(ImPlotPoint(*x_max,*y_max));
    }

    const bool input = !ImHasFlag(flags, ImPlotDragToolFlags_NoInputs);
    const bool show_curs = !ImHasFlag(flags, ImPlotDragToolFlags_NoCursors);
    const bool no_delay = !ImHasFlag(flags, ImPlotDragToolFlags_Delayed);
    bool    h[] = {true,false,true,false};
    double* x[] = {x_min,x_max,x_max,x_min};
    double* y[] = {y_min,y_min,y_max,y_max};
    ImVec2 p[4];
    for (int i = 0; i < 4; ++i)
        p[i] = PlotToPixels(*x[i],*y[i],IMPLOT_AUTO,IMPLOT_AUTO);
    ImVec2 pc = PlotToPixels((*x_min+*x_max)/2,(*y_min+*y_max)/2,IMPLOT_AUTO,IMPLOT_AUTO);
    ImRect rect(ImMin(p[0],p[2]),ImMax(p[0],p[2]));
    ImRect rect_grab = rect; rect_grab.Expand(DRAG_GRAB_HALF_SIZE);

    ImGuiMouseCursor cur[4];
    if (show_curs) {
        cur[0] = (rect.Min.x == p[0].x && rect.Min.y == p[0].y) || (rect.Max.x == p[0].x && rect.Max.y == p[0].y) ? ImGuiMouseCursor_ResizeNWSE : ImGuiMouseCursor_ResizeNESW;
        cur[1] = cur[0] == ImGuiMouseCursor_ResizeNWSE ? ImGuiMouseCursor_ResizeNESW : ImGuiMouseCursor_ResizeNWSE;
        cur[2] = cur[1] == ImGuiMouseCursor_ResizeNWSE ? ImGuiMouseCursor_ResizeNESW : ImGuiMouseCursor_ResizeNWSE;
        cur[3] = cur[2] == ImGuiMouseCursor_ResizeNWSE ? ImGuiMouseCursor_ResizeNESW : ImGuiMouseCursor_ResizeNWSE;
    }

    ImVec4 color = IsColorAuto(col) ? ImGui::GetStyleColorVec4(ImGuiCol_Text) : col;
    ImU32 col32 = ImGui::ColorConvertFloat4ToU32(color);
    color.w *= 0.25f;
    ImU32 col32_a = ImGui::ColorConvertFloat4ToU32(color);
    const ImGuiID id = ImGui::GetCurrentWindow()->GetID(n_id);

    bool modified = false;
    bool clicked = false, hovered = false, held = false;

    const bool is_movable = *x_min != *x_max || *y_min != *y_max;
    if (is_movable) {
        ImGui::KeepAliveID(id);
        if (input) {
            // middle point
            ImRect b_rect(pc.x-DRAG_GRAB_HALF_SIZE,pc.y-DRAG_GRAB_HALF_SIZE,pc.x+DRAG_GRAB_HALF_SIZE,pc.y+DRAG_GRAB_HALF_SIZE);
            clicked = ImGui::ButtonBehavior(b_rect,id,&hovered,&held);
            if (out_clicked) *out_clicked = clicked;
            if (out_hovered) *out_hovered = hovered;
            if (out_held)    *out_held    = held;
        }

        if ((hovered || held) && show_curs)
            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeAll);
        if (held && ImGui::IsMouseDragging(0)) {
            for (int i = 0; i < 4; ++i) {
                ImPlotPoint pp = PixelsToPlot(p[i] + ImGui::GetIO().MouseDelta,IMPLOT_AUTO,IMPLOT_AUTO);
                *y[i] = pp.y;