C++ PixelRect类代码示例

gcc_pure
static PixelRect
GetBottomWidgetRect(const PixelRect &rc, const Widget *bottom_widget)
{
  if (bottom_widget == nullptr) {
    /* no bottom widget: return empty rectangle, map uses the whole
       main area */
    PixelRect result = rc;
    result.top = result.bottom;
    return result;
  }

  const unsigned requested_height = bottom_widget->GetMinimumSize().cy;
  unsigned height;
  if (requested_height > 0) {
    const unsigned max_height = rc.GetHeight() / 2;
    height = std::min(max_height, requested_height);
  } else {
    const unsigned recommended_height = rc.GetHeight() / 3;
    height = recommended_height;
  }

  PixelRect result = rc;
  result.top = result.bottom - height;
  return result;
}

void
InfoBoxContentWindArrow::OnCustomPaint(Canvas &canvas, const PixelRect &rc)
{
  const auto &info = CommonInterface::Calculated();

  const auto pt = rc.GetCenter();

  const unsigned padding = Layout::FastScale(10u);
  unsigned size = std::min(rc.GetWidth(), rc.GetHeight());

  if (size > padding)
    size -= padding;

  // Normalize the size because the Layout::Scale is applied
  // by the DrawArrow() function again
  size = size * 100 / Layout::Scale(100);

  auto angle = info.wind.bearing - CommonInterface::Basic().attitude.heading;

  const int length =
    std::min(size, std::max(10u, uround(Quadruple(info.wind.norm))));

  const int offset = -length / 2;

  auto style = CommonInterface::GetMapSettings().wind_arrow_style;

  WindArrowRenderer renderer(UIGlobals::GetLook().wind_arrow_info_box);
  renderer.DrawArrow(canvas, pt, angle, length, style, offset);
}

void
HorizonRenderer::Draw(Canvas &canvas, const PixelRect &rc,
                      const HorizonLook &look,
                      const AttitudeState &attitude)
{
  /*
  This feature of having a backup artificial horizon based on inferred
  orientation from GPS and vario data is useful, and reasonably well
  tested, but has the issue of potentially invalidating use of XCSoar in
  FAI contests due to rule ref Annex A to Section 3 (2010 Edition) 4.1.2
  "No instruments permitting pilots to fly without visual reference to
  the ground may be carried on board, even if made unserviceable."  The
  quality of XCSoar's pseudo-AH is arguably good enough that this
  violates the rule.  We need to seek clarification as to whether this
  is the case or not.
  */

  const auto center = rc.GetCenter();

  const int radius = std::min(rc.GetWidth(), rc.GetHeight()) / 2
    - Layout::Scale(1);

  auto bank_degrees = attitude.IsBankAngleUseable()
    ? attitude.bank_angle.Degrees()
    : 0.;

  auto pitch_degrees = attitude.IsPitchAngleUseable()
    ? attitude.pitch_angle.Degrees()
    : 0.;

  auto phi = Clamp(bank_degrees, -89., 89.);
  auto alpha = Angle::acos(Clamp(pitch_degrees / 50,
                                 -1., 1.));
  auto sphi = Angle::HalfCircle() - Angle::Degrees(phi);
  auto alpha1 = sphi - alpha;
  auto alpha2 = sphi + alpha;

  // draw sky part
  canvas.Select(look.sky_pen);
  canvas.Select(look.sky_brush);
  canvas.DrawSegment(center, radius, alpha2, alpha1, true);

  // draw ground part
  canvas.Select(look.terrain_pen);
  canvas.Select(look.terrain_brush);
  canvas.DrawSegment(center, radius, alpha1, alpha2, true);

  // draw aircraft symbol
  canvas.Select(look.aircraft_pen);
  canvas.DrawLine(center.x + radius / 2, center.y, center.x - radius / 2, center.y);
  canvas.DrawLine(center.x, center.y - radius / 4, center.x, center.y);

  // draw 45 degree dash marks
  const int rr2p = uround(radius * M_SQRT1_2) + Layout::Scale(1);
  const int rr2n = rr2p - Layout::Scale(2);
  canvas.DrawLine(center.x + rr2p, center.y - rr2p,
              center.x + rr2n, center.y - rr2n);
  canvas.DrawLine(center.x - rr2p, center.y - rr2p,
              center.x - rr2n, center.y - rr2n);
}

PixelRect GetButtonPosition(unsigned MenuID, const PixelRect& rcScreen) {
    PixelRect rc = rcScreen;
    rc.Grow(-1); // remove Margin

    unsigned i = MenuID - 1;
    
    assert(i < MenuButtons.size());
    
    const PixelScalar row   = ScreenLandscape ? LandscapeLayout[i].row : PortraitLayout[i].row;
    const PixelScalar col   = ScreenLandscape ? LandscapeLayout[i].col :PortraitLayout[i].col;
    const PixelScalar nbRow = ScreenLandscape ? 5 : 7;
    const PixelScalar nbCol = ScreenLandscape ? 5 : 4;

    const PixelSize size = {
        std::min<PixelScalar>((rc.GetSize().cx-(nbCol-1))/nbCol, NIBLSCALE(80)), 
        std::min<PixelScalar>((rc.GetSize().cy-nbRow-1)/nbRow, NIBLSCALE(40))
    };
    
    const double x_interval = (rc.GetSize().cx - size.cx * nbCol) / (nbCol-1);
    const double y_interval = (rc.GetSize().cy - size.cy * nbRow) / (nbRow-1);

    const RasterPoint origin = {
        rc.left + (PixelScalar)(col * (size.cx + x_interval)),
        rc.top + (PixelScalar)(row * (size.cy + y_interval))
    };

    return PixelRect(origin, size);
}

void
SymbolRenderer::DrawArrow(Canvas &canvas, PixelRect rc, Direction direction)
{
  assert(direction == UP || direction == DOWN ||
         direction == LEFT || direction == RIGHT);

  auto size = std::min(rc.GetWidth(), rc.GetHeight()) / 5;
  auto center = rc.GetCenter();
  BulkPixelPoint arrow[3];

  if (direction == LEFT || direction == RIGHT) {
    arrow[0].x = center.x + (direction == LEFT ? size : -size);
    arrow[0].y = center.y + size;
    arrow[1].x = center.x + (direction == LEFT ? -size : size);
    arrow[1].y = center.y;
    arrow[2].x = center.x + (direction == LEFT ? size : -size);
    arrow[2].y = center.y - size;
  } else if (direction == UP || direction == DOWN) {
    arrow[0].x = center.x + size;
    arrow[0].y = center.y + (direction == UP ? size : -size);
    arrow[1].x = center.x;
    arrow[1].y = center.y + (direction == UP ? -size : size);
    arrow[2].x = center.x - size;
    arrow[2].y = center.y + (direction == UP ? size : -size);
  }

  canvas.DrawTriangleFan(arrow, 3);
}

PixelRect
ButtonPanel::HorizontalRange(PixelRect rc, unsigned start, unsigned end)
{
  const unsigned n = end - start;
  assert(n > 0);

  const unsigned total_width = rc.GetWidth();
  const unsigned total_height = rc.GetHeight();
  const unsigned max_row_height = Layout::GetMaximumControlHeight();
  const unsigned row_height = max_row_height < total_height / 2
    ? max_row_height
    : std::max(Layout::GetMinimumControlHeight(),
               total_height / 2);
  const unsigned width = total_width / n;
  assert(width > 0);

  PixelRect button_rc(rc.left, rc.bottom - row_height,
                      rc.left + width, rc.bottom);
  rc.bottom -= row_height;

  for (unsigned i = start; i < end; ++i) {
    buttons[i]->Move(button_rc);

    button_rc.left = button_rc.right;
    button_rc.right += width;
  }

  return rc;
}

void
Window::Create(ContainerWindow *parent, PixelRect rc,
               const WindowStyle window_style)
{
  assert(IsScreenInitialized());
  assert(rc.left <= rc.right);
  assert(rc.right - rc.left < 0x8000);
  assert(rc.top <= rc.bottom);
  assert(rc.bottom - rc.top < 0x8000);

  double_clicks = window_style.double_clicks;

  this->parent = parent;
  position = rc.GetOrigin();
  size = rc.GetSize();

  tab_stop = window_style.tab_stop;
  control_parent = window_style.control_parent;
  visible = window_style.visible;
  enabled = window_style.enabled;
  has_border = window_style.has_border;
  text_style = window_style.text_style;

  if (parent != NULL)
    parent->AddChild(*this);

  OnCreate();
  OnResize(size);
}

PixelRect
ButtonFrameRenderer::GetDrawingRect(PixelRect rc, bool pressed) const
{
  rc.Grow(-2);
  if (pressed)
    rc.Offset(1, 1);

  return rc;
}

inline void
TabMenuDisplay::PaintMainMenuBorder(Canvas &canvas) const
{
  PixelRect rc = GetMainMenuButtonSize(0);
  rc.bottom = GetMainMenuButtonSize(GetNumMainMenuItems() - 1).bottom;
  rc.Grow(GetTabLineHeight());

  canvas.DrawFilledRectangle(rc, COLOR_BLACK);
}

static void
Draw(Canvas &canvas)
{
  PixelRect rc = canvas.GetRect();
  rc.Grow(-16);

  DrawBanner(canvas, rc);
  DrawFlights(canvas, rc);
}

void
Canvas::InvertRectangle(PixelRect r)
{
  if (r.IsEmpty())
    return;

  CopyNot(r.left, r.top, r.GetWidth(), r.GetHeight(),
          buffer, r.left, r.top);
}

inline void
TabMenuDisplay::PaintSubMenuBorder(Canvas &canvas,
                                   const MainMenuButton &main_button) const
{
  PixelRect rc = GetSubMenuButtonSize(main_button.first_page_index);
  rc.bottom = GetSubMenuButtonSize(main_button.last_page_index).bottom;
  rc.Grow(GetTabLineHeight());

  canvas.DrawFilledRectangle(rc, COLOR_BLACK);
}

PixelRect
ButtonPanel::UpdateLayout(const PixelRect rc)
{
  if (buttons.empty())
    return rc;

  const bool landscape = rc.GetWidth() > rc.GetHeight();
  return landscape
    ? LeftLayout(rc)
    : BottomLayout(rc);
}

  virtual void OnPaint(Canvas &canvas) override {
    canvas.ClearWhite();

    const PixelRect rc = canvas.GetRect();
    PixelPoint pt = rc.GetCenter();

    canvas.SelectBlackPen();
    canvas.SelectHollowBrush();
    canvas.DrawCircle(pt.x, pt.y, 2);

    renderer.Draw(canvas, Angle::Zero(), wind, pt, rc, WindArrowStyle::ARROW_HEAD);
  }

unsigned
WndFrame::GetTextHeight() const
{
  PixelRect rc = GetClientRect();
  const int padding = Layout::GetTextPadding();
  rc.Grow(-padding);

  AnyCanvas canvas;
  canvas.Select(look.text_font);

  return text_renderer.GetHeight(canvas, rc, text.c_str());
}