Method RenderRectFilledRangeH

lib/imgui/imgui_draw.cpp:3189–3247

FIXME: Cleanup and move code to ImDrawList.

// FIXME: Cleanup and move code to ImDrawList.
void ImGui::RenderRectFilledRangeH(ImDrawList* draw_list, const ImRect& rect, ImU32 col, float x_start_norm, float x_end_norm, float rounding)
{
    if (x_end_norm == x_start_norm)
        return;
    if (x_start_norm > x_end_norm)
        ImSwap(x_start_norm, x_end_norm);

    ImVec2 p0 = ImVec2(ImLerp(rect.Min.x, rect.Max.x, x_start_norm), rect.Min.y);
    ImVec2 p1 = ImVec2(ImLerp(rect.Min.x, rect.Max.x, x_end_norm), rect.Max.y);
    if (rounding == 0.0f)
    {
        draw_list->AddRectFilled(p0, p1, col, 0.0f);
        return;
    }

    rounding = ImClamp(ImMin((rect.Max.x - rect.Min.x) * 0.5f, (rect.Max.y - rect.Min.y) * 0.5f) - 1.0f, 0.0f, rounding);
    const float inv_rounding = 1.0f / rounding;
    const float arc0_b = ImAcos01(1.0f - (p0.x - rect.Min.x) * inv_rounding);
    const float arc0_e = ImAcos01(1.0f - (p1.x - rect.Min.x) * inv_rounding);
    const float half_pi = IM_PI * 0.5f; // We will == compare to this because we know this is the exact value ImAcos01 can return.
    const float x0 = ImMax(p0.x, rect.Min.x + rounding);
    if (arc0_b == arc0_e)
    {
        draw_list->PathLineTo(ImVec2(x0, p1.y));
        draw_list->PathLineTo(ImVec2(x0, p0.y));
    }
    else if (arc0_b == 0.0f && arc0_e == half_pi)
    {
        draw_list->PathArcToFast(ImVec2(x0, p1.y - rounding), rounding, 3, 6); // BL
        draw_list->PathArcToFast(ImVec2(x0, p0.y + rounding), rounding, 6, 9); // TR
    }
    else
    {
        draw_list->PathArcTo(ImVec2(x0, p1.y - rounding), rounding, IM_PI - arc0_e, IM_PI - arc0_b, 3); // BL
        draw_list->PathArcTo(ImVec2(x0, p0.y + rounding), rounding, IM_PI + arc0_b, IM_PI + arc0_e, 3); // TR
    }
    if (p1.x > rect.Min.x + rounding)
    {
        const float arc1_b = ImAcos01(1.0f - (rect.Max.x - p1.x) * inv_rounding);
        const float arc1_e = ImAcos01(1.0f - (rect.Max.x - p0.x) * inv_rounding);
        const float x1 = ImMin(p1.x, rect.Max.x - rounding);
        if (arc1_b == arc1_e)
        {
            draw_list->PathLineTo(ImVec2(x1, p0.y));
            draw_list->PathLineTo(ImVec2(x1, p1.y));
        }
        else if (arc1_b == 0.0f && arc1_e == half_pi)
        {
            draw_list->PathArcToFast(ImVec2(x1, p0.y + rounding), rounding, 9, 12); // TR
            draw_list->PathArcToFast(ImVec2(x1, p1.y - rounding), rounding, 0, 3);  // BR
        }
        else
        {
            draw_list->PathArcTo(ImVec2(x1, p0.y + rounding), rounding, -arc1_e, -arc1_b, 3); // TR
            draw_list->PathArcTo(ImVec2(x1, p1.y - rounding), rounding, +arc1_b, +arc1_e, 3); // BR
        }
    }
    draw_list->PathFillConvex(col);