linkgraph_gui.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "../stdafx.h"
#include "../window_gui.h"
#include "../window_func.h"
#include "../company_base.h"
#include "../company_gui.h"
#include "../timer/timer_game_tick.h"
#include "../timer/timer_game_calendar.h"
#include "../viewport_func.h"
#include "../zoom_func.h"
#include "../smallmap_gui.h"
#include "../core/geometry_func.hpp"
#include "../widgets/link_graph_legend_widget.h"
#include "../strings_func.h"
#include "linkgraph_gui.h"
 
#include "table/strings.h"
 
#include "../safeguards.h"

const PixelColour LinkGraphOverlay::LINK_COLOURS[][12] = {
{
  PixelColour{0x0f}, PixelColour{0xd1}, PixelColour{0xd0}, PixelColour{0x57},
  PixelColour{0x55}, PixelColour{0x53}, PixelColour{0xbf}, PixelColour{0xbd},
  PixelColour{0xba}, PixelColour{0xb9}, PixelColour{0xb7}, PixelColour{0xb5}
},
{
  PixelColour{0x0f}, PixelColour{0xd1}, PixelColour{0xd0}, PixelColour{0x57},
  PixelColour{0x55}, PixelColour{0x53}, PixelColour{0x96}, PixelColour{0x95},
  PixelColour{0x94}, PixelColour{0x93}, PixelColour{0x92}, PixelColour{0x91}
},
{
  PixelColour{0x0f}, PixelColour{0x0b}, PixelColour{0x09}, PixelColour{0x07},
  PixelColour{0x05}, PixelColour{0x03}, PixelColour{0xbf}, PixelColour{0xbd},
  PixelColour{0xba}, PixelColour{0xb9}, PixelColour{0xb7}, PixelColour{0xb5}
},
{
  PixelColour{0x0f}, PixelColour{0x0b}, PixelColour{0x0a}, PixelColour{0x09},
  PixelColour{0x08}, PixelColour{0x07}, PixelColour{0x06}, PixelColour{0x05},
  PixelColour{0x04}, PixelColour{0x03}, PixelColour{0x02}, PixelColour{0x01}
}
};

void LinkGraphOverlay::GetWidgetDpi(DrawPixelInfo *dpi) const
{
  const NWidgetBase *wi = this->window->GetWidget<NWidgetBase>(this->widget_id);
  dpi->left = dpi->top = 0;
  dpi->width = wi->current_x;
  dpi->height = wi->current_y;
}

void LinkGraphOverlay::RebuildCache()
{
  this->cached_links.clear();
  this->cached_stations.clear();
  if (this->company_mask.None()) return;
 
  DrawPixelInfo dpi;
  this->GetWidgetDpi(&dpi);
 
  for (const Station *sta : Station::Iterate()) {
    if (sta->rect.IsEmpty()) continue;
 
    Point pta = this->GetStationMiddle(sta);
 
    StationID from = sta->index;
    StationLinkMap &seen_links = this->cached_links[from];
 
    uint supply = 0;
    for (CargoType cargo : SetCargoBitIterator(this->cargo_mask)) {
      if (!CargoSpec::Get(cargo)->IsValid()) continue;
      if (!LinkGraph::IsValidID(sta->goods[cargo].link_graph)) continue;
      const LinkGraph &lg = *LinkGraph::Get(sta->goods[cargo].link_graph);
 
      ConstNode &from_node = lg[sta->goods[cargo].node];
      supply += lg.Monthly(from_node.supply);
      for (const Edge &edge : from_node.edges) {
        StationID to = lg[edge.dest_node].station;
        assert(from != to);
        if (!Station::IsValidID(to) || seen_links.find(to) != seen_links.end()) {
          continue;
        }
        const Station *stb = Station::Get(to);
        assert(sta != stb);
 
        /* Show links between stations of selected companies or "neutral" ones like oilrigs. */
        if (stb->owner != OWNER_NONE && sta->owner != OWNER_NONE && !this->company_mask.Test(stb->owner)) continue;
        if (stb->rect.IsEmpty()) continue;
 
        if (!this->IsLinkVisible(pta, this->GetStationMiddle(stb), &dpi)) continue;
 
        this->AddLinks(sta, stb);
        seen_links[to]; // make sure it is created and marked as seen
      }
    }
    if (this->IsPointVisible(pta, &dpi)) {
      this->cached_stations.emplace_back(from, supply);
    }
  }
}

inline bool LinkGraphOverlay::IsPointVisible(Point pt, const DrawPixelInfo *dpi, int padding) const
{
  return pt.x > dpi->left - padding && pt.y > dpi->top - padding &&
      pt.x < dpi->left + dpi->width + padding &&
      pt.y < dpi->top + dpi->height + padding;
}

inline bool LinkGraphOverlay::IsLinkVisible(Point pta, Point ptb, const DrawPixelInfo *dpi, int padding) const
{
  const int left = dpi->left - padding;
  const int right = dpi->left + dpi->width + padding;
  const int top = dpi->top - padding;
  const int bottom = dpi->top + dpi->height + padding;
 
  /*
   * This method is an implementation of the Cohen-Sutherland line-clipping algorithm.
   * See: https://en.wikipedia.org/wiki/Cohen%E2%80%93Sutherland_algorithm
   */
 
  const uint8_t INSIDE = 0; // 0000
  const uint8_t LEFT   = 1; // 0001
  const uint8_t RIGHT  = 2; // 0010
  const uint8_t BOTTOM = 4; // 0100
  const uint8_t TOP    = 8; // 1000
 
  int x0 = pta.x;
  int y0 = pta.y;
  int x1 = ptb.x;
  int y1 = ptb.y;
 
  auto out_code = [&](int x, int y) -> uint8_t {
    uint8_t out = INSIDE;
    if (x < left) {
      out |= LEFT;
    } else if (x > right) {
      out |= RIGHT;
    }
    if (y < top) {
      out |= TOP;
    } else if (y > bottom) {
      out |= BOTTOM;
    }
    return out;
  };
 
  uint8_t c0 = out_code(x0, y0);
  uint8_t c1 = out_code(x1, y1);
 
  while (true) {
    if (c0 == 0 || c1 == 0) return true;
    if ((c0 & c1) != 0) return false;
 
    if (c0 & TOP) {           // point 0 is above the clip window
      x0 = x0 + (int)(((int64_t) (x1 - x0)) * ((int64_t) (top - y0)) / ((int64_t) (y1 - y0)));
      y0 = top;
    } else if (c0 & BOTTOM) { // point 0 is below the clip window
      x0 = x0 + (int)(((int64_t) (x1 - x0)) * ((int64_t) (bottom - y0)) / ((int64_t) (y1 - y0)));
      y0 = bottom;
    } else if (c0 & RIGHT) {  // point 0 is to the right of clip window
      y0 = y0 + (int)(((int64_t) (y1 - y0)) * ((int64_t) (right - x0)) / ((int64_t) (x1 - x0)));
      x0 = right;
    } else if (c0 & LEFT) {   // point 0 is to the left of clip window
      y0 = y0 + (int)(((int64_t) (y1 - y0)) * ((int64_t) (left - x0)) / ((int64_t) (x1 - x0)));
      x0 = left;
    }
 
    c0 = out_code(x0, y0);
  }
 
  NOT_REACHED();
}

void LinkGraphOverlay::AddLinks(const Station *from, const Station *to)
{
  for (CargoType cargo : SetCargoBitIterator(this->cargo_mask)) {
    if (!CargoSpec::Get(cargo)->IsValid()) continue;
    const GoodsEntry &ge = from->goods[cargo];
    if (!LinkGraph::IsValidID(ge.link_graph) ||
        ge.link_graph != to->goods[cargo].link_graph) {
      continue;
    }
    const LinkGraph &lg = *LinkGraph::Get(ge.link_graph);
    if (lg[ge.node].HasEdgeTo(to->goods[cargo].node)) {
      ConstEdge &edge = lg[ge.node][to->goods[cargo].node];
      this->AddStats(cargo, lg.Monthly(edge.capacity), lg.Monthly(edge.usage),
          ge.HasData() ? ge.GetData().flows.GetFlowVia(to->index) : 0,
          edge.TravelTime() / Ticks::DAY_TICKS,
          from->owner == OWNER_NONE || to->owner == OWNER_NONE,
          this->cached_links[from->index][to->index]);
    }
  }
}

/* static */ void LinkGraphOverlay::AddStats(CargoType new_cargo, uint new_cap, uint new_usg, uint new_plan, uint32_t time, bool new_shared, LinkProperties &cargo)
{
  /* multiply the numbers by 32 in order to avoid comparing to 0 too often. */
  if (cargo.capacity == 0 ||
      cargo.Usage() * 32 / (cargo.capacity + 1) < std::max(new_usg, new_plan) * 32 / (new_cap + 1)) {
    cargo.cargo = new_cargo;
    cargo.capacity = new_cap;
    cargo.usage = new_usg;
    cargo.planned = new_plan;
    cargo.time = time;
  }
  if (new_shared) cargo.shared = true;
}

void LinkGraphOverlay::Draw(const DrawPixelInfo *dpi)
{
  if (this->dirty) {
    this->RebuildCache();
    this->dirty = false;
  }
  this->DrawLinks(dpi);
  this->DrawStationDots(dpi);
}

void LinkGraphOverlay::DrawLinks(const DrawPixelInfo *dpi) const
{
  int width = ScaleGUITrad(this->scale);
  for (const auto &i : this->cached_links) {
    if (!Station::IsValidID(i.first)) continue;
    Point pta = this->GetStationMiddle(Station::Get(i.first));
    for (const auto &j : i.second) {
      if (!Station::IsValidID(j.first)) continue;
      Point ptb = this->GetStationMiddle(Station::Get(j.first));
      if (!this->IsLinkVisible(pta, ptb, dpi, width + 2)) continue;
      this->DrawContent(pta, ptb, j.second);
    }
  }
}

void LinkGraphOverlay::DrawContent(Point pta, Point ptb, const LinkProperties &cargo) const
{
  uint usage_or_plan = std::min(cargo.capacity * 2 + 1, cargo.Usage());
  PixelColour colour = LinkGraphOverlay::LINK_COLOURS[_settings_client.gui.linkgraph_colours][usage_or_plan * lengthof(LinkGraphOverlay::LINK_COLOURS[0]) / (cargo.capacity * 2 + 2)];
  int width = ScaleGUITrad(this->scale);
  int dash = cargo.shared ? width * 4 : 0;
 
  /* Move line a bit 90° against its dominant direction to prevent it from
   * being hidden below the grey line. */
  int side = _settings_game.vehicle.road_side ? 1 : -1;
  if (abs(pta.x - ptb.x) < abs(pta.y - ptb.y)) {
    int offset_x = (pta.y > ptb.y ? 1 : -1) * side * width;
    GfxDrawLine(pta.x + offset_x, pta.y, ptb.x + offset_x, ptb.y, colour, width, dash);
  } else {
    int offset_y = (pta.x < ptb.x ? 1 : -1) * side * width;
    GfxDrawLine(pta.x, pta.y + offset_y, ptb.x, ptb.y + offset_y, colour, width, dash);
  }
 
  GfxDrawLine(pta.x, pta.y, ptb.x, ptb.y, GetColourGradient(COLOUR_GREY, SHADE_DARKEST), width);
}

void LinkGraphOverlay::DrawStationDots(const DrawPixelInfo *dpi) const
{
  int width = ScaleGUITrad(this->scale);
  for (const auto &i : this->cached_stations) {
    const Station *st = Station::GetIfValid(i.first);
    if (st == nullptr) continue;
    Point pt = this->GetStationMiddle(st);
    if (!this->IsPointVisible(pt, dpi, 3 * width)) continue;
 
    uint r = width * 2 + width * 2 * std::min(200U, i.second) / 200;
 
    LinkGraphOverlay::DrawVertex(pt.x, pt.y, r,
        GetColourGradient(st->owner != OWNER_NONE ?
            Company::Get(st->owner)->colour : COLOUR_GREY, SHADE_LIGHT),
        GetColourGradient(COLOUR_GREY, SHADE_DARKEST));
  }
}

/* static */ void LinkGraphOverlay::DrawVertex(int x, int y, int size, PixelColour colour, PixelColour border_colour)
{
  size--;
  int w1 = size / 2;
  int w2 = size / 2 + size % 2;
  int borderwidth = ScaleGUITrad(1);
 
  GfxFillRect(x - w1 - borderwidth, y - w1 - borderwidth, x + w2 + borderwidth, y + w2 + borderwidth, border_colour);
  GfxFillRect(x - w1, y - w1, x + w2, y + w2, colour);
}
 
bool LinkGraphOverlay::ShowTooltip(Point pt, TooltipCloseCondition close_cond)
{
  for (auto i(this->cached_links.crbegin()); i != this->cached_links.crend(); ++i) {
    if (!Station::IsValidID(i->first)) continue;
    Point pta = this->GetStationMiddle(Station::Get(i->first));
    for (auto j(i->second.crbegin()); j != i->second.crend(); ++j) {
      if (!Station::IsValidID(j->first)) continue;
      if (i->first == j->first) continue;
 
      /* Check the distance from the cursor to the line defined by the two stations. */
      Point ptb = this->GetStationMiddle(Station::Get(j->first));
      float dist = std::abs((int64_t)(ptb.x - pta.x) * (int64_t)(pta.y - pt.y) - (int64_t)(pta.x - pt.x) * (int64_t)(ptb.y - pta.y)) /
        std::sqrt((int64_t)(ptb.x - pta.x) * (int64_t)(ptb.x - pta.x) + (int64_t)(ptb.y - pta.y) * (int64_t)(ptb.y - pta.y));
      const auto &link = j->second;
      if (dist <= 4 && link.Usage() > 0 &&
          pt.x + 2 >= std::min(pta.x, ptb.x) &&
          pt.x - 2 <= std::max(pta.x, ptb.x) &&
          pt.y + 2 >= std::min(pta.y, ptb.y) &&
          pt.y - 2 <= std::max(pta.y, ptb.y)) {
        static std::string tooltip_extension;
        tooltip_extension.clear();
        /* Fill buf with more information if this is a bidirectional link. */
        uint32_t back_time = 0;
        auto k = this->cached_links[j->first].find(i->first);
        if (k != this->cached_links[j->first].end()) {
          const auto &back = k->second;
          back_time = back.time;
          if (back.Usage() > 0) {
            tooltip_extension = GetString(STR_LINKGRAPH_STATS_TOOLTIP_RETURN_EXTENSION,
                back.cargo, back.Usage(), back.Usage() * 100 / (back.capacity + 1));
          }
        }
        /* Add information about the travel time if known. */
        const auto time = link.time ? back_time ? ((link.time + back_time) / 2) : link.time : back_time;
        if (time > 0) {
          auto params = MakeParameters(time);
          AppendStringWithArgsInPlace(tooltip_extension, STR_LINKGRAPH_STATS_TOOLTIP_TIME_EXTENSION, params);
        }
        GuiShowTooltips(this->window,
          GetEncodedString(TimerGameEconomy::UsingWallclockUnits() ? STR_LINKGRAPH_STATS_TOOLTIP_MINUTE : STR_LINKGRAPH_STATS_TOOLTIP_MONTH,
            link.cargo, link.Usage(), i->first, j->first, link.Usage() * 100 / (link.capacity + 1), tooltip_extension),
          close_cond);
        return true;
      }
    }
  }
  GuiShowTooltips(this->window, {}, close_cond);
  return false;
}

Point LinkGraphOverlay::GetStationMiddle(const Station *st) const
{
  if (this->window->viewport != nullptr) {
    return GetViewportStationMiddle(*this->window->viewport, st);
  } else {
    /* assume this is a smallmap */
    return GetSmallMapStationMiddle(this->window, st);
  }
}

void LinkGraphOverlay::SetCargoMask(CargoTypes cargo_mask)
{
  this->cargo_mask = cargo_mask;
  this->RebuildCache();
  this->window->GetWidget<NWidgetBase>(this->widget_id)->SetDirty(this->window);
}

void LinkGraphOverlay::SetCompanyMask(CompanyMask company_mask)
{
  this->company_mask = company_mask;
  this->RebuildCache();
  this->window->GetWidget<NWidgetBase>(this->widget_id)->SetDirty(this->window);
}

std::unique_ptr<NWidgetBase> MakeCompanyButtonRowsLinkGraphGUI()
{
  return MakeCompanyButtonRows(WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST, COLOUR_GREY, 3, STR_NULL);
}
 
std::unique_ptr<NWidgetBase> MakeSaturationLegendLinkGraphGUI()
{
  auto panel = std::make_unique<NWidgetVertical>(NWidContainerFlag::EqualSize);
  for (uint i = 0; i < lengthof(LinkGraphOverlay::LINK_COLOURS[0]); ++i) {
    auto wid = std::make_unique<NWidgetBackground>(WWT_PANEL, COLOUR_DARK_GREEN, i + WID_LGL_SATURATION_FIRST);
    wid->SetMinimalSize(50, 0);
    wid->SetMinimalTextLines(1, 0, FS_SMALL);
    wid->SetFill(1, 1);
    wid->SetResize(0, 0);
    panel->Add(std::move(wid));
  }
  return panel;
}
 
std::unique_ptr<NWidgetBase> MakeCargoesLegendLinkGraphGUI()
{
  uint num_cargo = static_cast<uint>(_sorted_cargo_specs.size());
  static const uint ENTRIES_PER_COL = 5;
  auto panel = std::make_unique<NWidgetHorizontal>(NWidContainerFlag::EqualSize);
  std::unique_ptr<NWidgetVertical> col = nullptr;
 
  for (uint i = 0; i < num_cargo; ++i) {
    if (i % ENTRIES_PER_COL == 0) {
      if (col != nullptr) panel->Add(std::move(col));
      col = std::make_unique<NWidgetVertical>(NWidContainerFlag::EqualSize);
    }
    auto wid = std::make_unique<NWidgetBackground>(WWT_PANEL, COLOUR_GREY, i + WID_LGL_CARGO_FIRST);
    wid->SetMinimalSize(25, 0);
    wid->SetMinimalTextLines(1, 0, FS_SMALL);
    wid->SetFill(1, 1);
    wid->SetResize(0, 0);
    col->Add(std::move(wid));
  }
  /* Fill up last row */
  for (uint i = num_cargo; i < Ceil(num_cargo, ENTRIES_PER_COL); ++i) {
    auto spc = std::make_unique<NWidgetSpacer>(25, 0);
    spc->SetMinimalTextLines(1, 0, FS_SMALL);
    spc->SetFill(1, 1);
    spc->SetResize(0, 0);
    col->Add(std::move(spc));
  }
  /* If there are no cargo specs defined, then col won't have been created so don't add it. */
  if (col != nullptr) panel->Add(std::move(col));
  return panel;
}
 
 
static constexpr std::initializer_list<NWidgetPart> _nested_linkgraph_legend_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN, WID_LGL_CAPTION), SetStringTip(STR_LINKGRAPH_LEGEND_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
    NWidget(NWID_HORIZONTAL), SetPadding(WidgetDimensions::unscaled.framerect), SetPIP(0, WidgetDimensions::unscaled.framerect.Horizontal(), 0),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_LGL_SATURATION),
        NWidgetFunction(MakeSaturationLegendLinkGraphGUI),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_LGL_COMPANIES),
        NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
          NWidgetFunction(MakeCompanyButtonRowsLinkGraphGUI),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_LGL_COMPANIES_ALL), SetStringTip(STR_LINKGRAPH_LEGEND_ALL),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_LGL_COMPANIES_NONE), SetStringTip(STR_LINKGRAPH_LEGEND_NONE),
        EndContainer(),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_LGL_CARGOES),
        NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
          NWidgetFunction(MakeCargoesLegendLinkGraphGUI),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_LGL_CARGOES_ALL), SetStringTip(STR_LINKGRAPH_LEGEND_ALL),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_LGL_CARGOES_NONE), SetStringTip(STR_LINKGRAPH_LEGEND_NONE),
        EndContainer(),
      EndContainer(),
    EndContainer(),
  EndContainer()
};
 
static_assert(WID_LGL_SATURATION_LAST - WID_LGL_SATURATION_FIRST ==
    lengthof(LinkGraphOverlay::LINK_COLOURS[0]) - 1);
 
static WindowDesc _linkgraph_legend_desc(
  WDP_AUTO, "toolbar_linkgraph", 0, 0,
  WC_LINKGRAPH_LEGEND, WC_NONE,
  {},
  _nested_linkgraph_legend_widgets
);

void ShowLinkGraphLegend()
{
  AllocateWindowDescFront<LinkGraphLegendWindow>(_linkgraph_legend_desc, 0);
}
 
LinkGraphLegendWindow::LinkGraphLegendWindow(WindowDesc &desc, int window_number) : Window(desc), num_cargo(_sorted_cargo_specs.size())
{
  this->InitNested(window_number);
  this->InvalidateData(0);
  this->SetOverlay(GetMainWindow()->viewport->overlay);
}

void LinkGraphLegendWindow::SetOverlay(std::shared_ptr<LinkGraphOverlay> overlay)
{
  this->overlay = std::move(overlay);
  CompanyMask companies = this->overlay->GetCompanyMask();
  for (CompanyID c = CompanyID::Begin(); c < MAX_COMPANIES; ++c) {
    if (!this->IsWidgetDisabled(WID_LGL_COMPANY_FIRST + c)) {
      this->SetWidgetLoweredState(WID_LGL_COMPANY_FIRST + c, companies.Test(c));
    }
  }
  CargoTypes cargoes = this->overlay->GetCargoMask();
  for (uint c = 0; c < this->num_cargo; c++) {
    this->SetWidgetLoweredState(WID_LGL_CARGO_FIRST + c, HasBit(cargoes, _sorted_cargo_specs[c]->Index()));
  }
}
 
void LinkGraphLegendWindow::UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize)
{
  if (IsInsideMM(widget, WID_LGL_SATURATION_FIRST, WID_LGL_SATURATION_LAST + 1)) {
    StringID str = STR_NULL;
    if (widget == WID_LGL_SATURATION_FIRST) {
      str = STR_LINKGRAPH_LEGEND_UNUSED;
    } else if (widget == WID_LGL_SATURATION_LAST) {
      str = STR_LINKGRAPH_LEGEND_OVERLOADED;
    } else if (widget == (WID_LGL_SATURATION_LAST + WID_LGL_SATURATION_FIRST) / 2) {
      str = STR_LINKGRAPH_LEGEND_SATURATED;
    }
    if (str != STR_NULL) {
      Dimension dim = GetStringBoundingBox(str, FS_SMALL);
      dim.width += padding.width;
      dim.height += padding.height;
      size = maxdim(size, dim);
    }
  }
  if (IsInsideMM(widget, WID_LGL_CARGO_FIRST, WID_LGL_CARGO_LAST + 1)) {
    const CargoSpec *cargo = _sorted_cargo_specs[widget - WID_LGL_CARGO_FIRST];
    Dimension dim = GetStringBoundingBox(cargo->abbrev, FS_SMALL);
    dim.width += padding.width;
    dim.height += padding.height;
    size = maxdim(size, dim);
  }
}
 
void LinkGraphLegendWindow::DrawWidget(const Rect &r, WidgetID widget) const
{
  Rect br = r.Shrink(WidgetDimensions::scaled.bevel);
  if (IsInsideMM(widget, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST + 1)) {
    if (this->IsWidgetDisabled(widget)) return;
    CompanyID cid = (CompanyID)(widget - WID_LGL_COMPANY_FIRST);
    Dimension sprite_size = GetSpriteSize(SPR_COMPANY_ICON);
    DrawCompanyIcon(cid, CentreBounds(br.left, br.right, sprite_size.width), CentreBounds(br.top, br.bottom, sprite_size.height));
  }
  if (IsInsideMM(widget, WID_LGL_SATURATION_FIRST, WID_LGL_SATURATION_LAST + 1)) {
    PixelColour colour = LinkGraphOverlay::LINK_COLOURS[_settings_client.gui.linkgraph_colours][widget - WID_LGL_SATURATION_FIRST];
    GfxFillRect(br, colour);
    StringID str = STR_NULL;
    if (widget == WID_LGL_SATURATION_FIRST) {
      str = STR_LINKGRAPH_LEGEND_UNUSED;
    } else if (widget == WID_LGL_SATURATION_LAST) {
      str = STR_LINKGRAPH_LEGEND_OVERLOADED;
    } else if (widget == (WID_LGL_SATURATION_LAST + WID_LGL_SATURATION_FIRST) / 2) {
      str = STR_LINKGRAPH_LEGEND_SATURATED;
    }
    if (str != STR_NULL) {
      DrawString(br.left, br.right, CentreBounds(br.top, br.bottom, GetCharacterHeight(FS_SMALL)), str, GetContrastColour(colour) | TC_FORCED, SA_HOR_CENTER, false, FS_SMALL);
    }
  }
  if (IsInsideMM(widget, WID_LGL_CARGO_FIRST, WID_LGL_CARGO_LAST + 1)) {
    const CargoSpec *cargo = _sorted_cargo_specs[widget - WID_LGL_CARGO_FIRST];
    GfxFillRect(br, cargo->legend_colour);
    DrawString(br.left, br.right, CentreBounds(br.top, br.bottom, GetCharacterHeight(FS_SMALL)), cargo->abbrev, GetContrastColour(cargo->legend_colour, 73), SA_HOR_CENTER, false, FS_SMALL);
  }
}
 
bool LinkGraphLegendWindow::OnTooltip([[maybe_unused]] Point, WidgetID widget, TooltipCloseCondition close_cond)
{
  if (IsInsideMM(widget, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST + 1)) {
    if (this->IsWidgetDisabled(widget)) {
      GuiShowTooltips(this, GetEncodedString(STR_LINKGRAPH_LEGEND_SELECT_COMPANIES), close_cond);
    } else {
      GuiShowTooltips(this,
        GetEncodedString(STR_LINKGRAPH_LEGEND_COMPANY_TOOLTIP,
          STR_LINKGRAPH_LEGEND_SELECT_COMPANIES,
          widget - WID_LGL_COMPANY_FIRST),
        close_cond);
    }
    return true;
  }
  if (IsInsideMM(widget, WID_LGL_CARGO_FIRST, WID_LGL_CARGO_LAST + 1)) {
    const CargoSpec *cargo = _sorted_cargo_specs[widget - WID_LGL_CARGO_FIRST];
    GuiShowTooltips(this, GetEncodedString(cargo->name), close_cond);
    return true;
  }
  return false;
}

void LinkGraphLegendWindow::UpdateOverlayCompanies()
{
  CompanyMask mask;
  for (CompanyID c = CompanyID::Begin(); c < MAX_COMPANIES; ++c) {
    if (this->IsWidgetDisabled(WID_LGL_COMPANY_FIRST + c)) continue;
    if (!this->IsWidgetLowered(WID_LGL_COMPANY_FIRST + c)) continue;
    mask.Set(c);
  }
  this->overlay->SetCompanyMask(mask);
}

void LinkGraphLegendWindow::UpdateOverlayCargoes()
{
  CargoTypes mask = 0;
  for (uint c = 0; c < num_cargo; c++) {
    if (!this->IsWidgetLowered(WID_LGL_CARGO_FIRST + c)) continue;
    SetBit(mask, _sorted_cargo_specs[c]->Index());
  }
  this->overlay->SetCargoMask(mask);
}
 
void LinkGraphLegendWindow::OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count)
{
  /* Check which button is clicked */
  if (IsInsideMM(widget, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST + 1)) {
    if (!this->IsWidgetDisabled(widget)) {
      this->ToggleWidgetLoweredState(widget);
      this->UpdateOverlayCompanies();
    }
  } else if (widget == WID_LGL_COMPANIES_ALL || widget == WID_LGL_COMPANIES_NONE) {
    for (CompanyID c = CompanyID::Begin(); c < MAX_COMPANIES; ++c) {
      if (this->IsWidgetDisabled(WID_LGL_COMPANY_FIRST + c)) continue;
      this->SetWidgetLoweredState(WID_LGL_COMPANY_FIRST + c, widget == WID_LGL_COMPANIES_ALL);
    }
    this->UpdateOverlayCompanies();
    this->SetDirty();
  } else if (IsInsideMM(widget, WID_LGL_CARGO_FIRST, WID_LGL_CARGO_LAST + 1)) {
    this->ToggleWidgetLoweredState(widget);
    this->UpdateOverlayCargoes();
  } else if (widget == WID_LGL_CARGOES_ALL || widget == WID_LGL_CARGOES_NONE) {
    for (uint c = 0; c < this->num_cargo; c++) {
      this->SetWidgetLoweredState(WID_LGL_CARGO_FIRST + c, widget == WID_LGL_CARGOES_ALL);
    }
    this->UpdateOverlayCargoes();
  }
  this->SetDirty();
}

void LinkGraphLegendWindow::OnInvalidateData([[maybe_unused]] int data, [[maybe_unused]] bool gui_scope)
{
  if (this->num_cargo != _sorted_cargo_specs.size()) {
    this->Close();
    return;
  }
 
  /* Disable the companies who are not active */
  for (CompanyID i = CompanyID::Begin(); i < MAX_COMPANIES; ++i) {
    this->SetWidgetDisabledState(WID_LGL_COMPANY_FIRST + i, !Company::IsValidID(i));
  }
}