Method DrawRuler

libs/drape_frontend/gui/ruler.cpp:190–232

}

void Ruler::DrawRuler(ref_ptr<dp::GraphicsContext> context, ShapeControl & control, ref_ptr<dp::TextureManager> tex,
                      bool isAppearing) const
{
  buffer_vector<RulerVertex, 4> data;

  dp::TextureManager::ColorRegion reg;
  tex->GetColorRegion(DrapeGui::GetGuiTextFont().m_color, reg);

  glsl::vec2 texCoord = glsl::ToVec2(reg.GetTexRect().Center());
  float const h = RulerHelper::GetRulerHalfHeight();

  glsl::vec2 normals[] = {
      glsl::vec2(-1.0, 0.0),
      glsl::vec2(1.0, 0.0),
  };

  dp::Anchor anchor = m_position.m_anchor;
  if (anchor & dp::Left)
    normals[0] = glsl::vec2(0.0, 0.0);
  else if (anchor & dp::Right)
    normals[1] = glsl::vec2(0.0, 0.0);

  data.push_back(RulerVertex(glsl::vec2(0.0, h), normals[0], texCoord));
  data.push_back(RulerVertex(glsl::vec2(0.0, -h), normals[0], texCoord));
  data.push_back(RulerVertex(glsl::vec2(0.0, h), normals[1], texCoord));
  data.push_back(RulerVertex(glsl::vec2(0.0, -h), normals[1], texCoord));

  auto state = df::CreateRenderState(gpu::Program::Ruler, df::DepthLayer::GuiLayer);
  state.SetColorTexture(reg.GetTexture());
  state.SetDepthTestEnabled(false);

  dp::AttributeProvider provider(1, 4);
  provider.InitStream(0, GetBindingInfo(), make_ref(data.data()));

  {
    dp::Batcher batcher(dp::Batcher::IndexPerQuad, dp::Batcher::VertexPerQuad);
    batcher.SetBatcherHash(static_cast<uint64_t>(df::BatcherBucket::Default));
    dp::SessionGuard guard(context, batcher, std::bind(&ShapeControl::AddShape, &control, _1, _2));
    batcher.InsertTriangleStrip(context, state, make_ref(&provider),
                                make_unique_dp<RulerHandle>(EGuiHandle::GuiHandleRuler, m_position.m_anchor,
                                                            m_position.m_pixelPivot, isAppearing));
  }
}

void Ruler::DrawText(ref_ptr<dp::GraphicsContext> context, ShapeControl & control, ref_ptr<dp::TextureManager> tex,
                     bool isAppearing) const