C++ paint函数代码示例

//Function executed at each frame
bool setMultiModelObjectTrajectory2D::draw(QImage **image) {
    if(!paint(*image))
        return false;
    return true;
}

void KoPACanvas::paintEvent( QPaintEvent *event )
{
    QPainter painter(this);
    paint(painter, event->rect());
    painter.end();
}

void QFrame::paintEvent(QPaintEvent *)
{
    QPainter paint(this);
    drawFrame(&paint);
}

void DhQGraphicsItemGroup::Dvhpaint(QPainter* x1, const QStyleOptionGraphicsItem* x2, QWidget* x3) {
  return paint(x1, x2, x3);
}

void graphics<Canvas>::paint(const point& position,
                             const PixelMatrix& pixel_matrix,
                             const point& lt, const point& rb)
{
    paint(position.x, position.y, pixel_matrix, lt, rb);
}

void Rec(int x,int y, int l,int w,int c)
{
    int i;
    for (i=x;i<n&&i<x+l;i++)
        paint(i,y,min(m-1,y+w-1),c);
}

void Tri(int x,int y, int w,int c)
{
    for (w=w/2;x<n&&w/2>=0;x++,w--)
        paint(x,max(0,y-w),min(m-1,y+w),c);
}

void
SequentialBrushStroke::mouse_moved(const NPoint& point, uint buttons)
{
	if(painting())
	{
		struct func {
			static coord abs(coord val) {return val < 0 ? -val : val;}
			static coord sgn(coord val) {return val < 0 ?   -1 :   1;}
		};

		coord x1 = m_prev_point.x, y1 = m_prev_point.y;
		coord x2 = point.x,        y2 = point.y;

		coord dx = func::abs(x2 - x1);
		coord dy = func::abs(y2 - y1);
		coord sx = func::sgn(x2 - x1);
		coord sy = func::sgn(y2 - y1);

		coord x = x1;
		coord y = y1;
		if(dx >= dy)
		{
			coord d = -dx;

			for(int i=0; i<=dx; ++i)
			{
				paint(NPoint(x, y));

				x += sx;
				d += dy * 2;

				if(d >= 0)
				{
					y += sy;
					d -= dx * 2;
				}
			}
		}
		else
		{
			coord d = -dy;

			for(int i=0; i<=dy; ++i)
			{
				paint(NPoint(x, y));

				y += sy;
				d += dx * 2;

				if(d >= 0)
				{
					x += sx;
					d -= dy * 2;
				}
			}
		}

		m_prev_point = point;
	}

	BrushStroke::mouse_moved(point, buttons);
}

void
DiscreteBrushStroke::mouse_down(const NPoint& point, uint buttons, bool dbl)
{
	BrushStroke::mouse_down(point, buttons, dbl);
	paint(point);
}

void Annotation::paint(QPainter *painter) const
{
	paint(painter, _rect);
}

//.........这里部分代码省略.........
   * cogl_get_rectangle_indices() is a convenience function for
   * accessing internal index buffers that can be shared.
   */
  data.indices = cogl_get_rectangle_indices (ctx, 6 /* n_rectangles */);
  data.prim = cogl_primitive_new_p3t2 (ctx, COGL_VERTICES_MODE_TRIANGLES,
                                       G_N_ELEMENTS (vertices),
                                       vertices);
  /* Each face will have 6 indices so we have 6 * 6 indices in total... */
  cogl_primitive_set_indices (data.prim,
                              data.indices,
                              6 * 6);

  /* Load a jpeg crate texture from a file */
  printf ("crate.jpg (CC by-nc-nd http://bit.ly/9kP45T) ShadowRunner27 http://bit.ly/m1YXLh\n");
  data.texture = cogl_texture_new_from_file (COGL_EXAMPLES_DATA "crate.jpg",
                                             COGL_TEXTURE_NO_SLICING,
                                             COGL_PIXEL_FORMAT_ANY,
                                             &error);
  if (!data.texture)
    g_error ("Failed to load texture: %s", error->message);

  /* a CoglPipeline conceptually describes all the state for vertex
   * processing, fragment processing and blending geometry. When
   * drawing the geometry for the crate this pipeline says to sample a
   * single texture during fragment processing... */
  data.crate_pipeline = cogl_pipeline_new (ctx);
  cogl_pipeline_set_layer_texture (data.crate_pipeline, 0, data.texture);

  /* Since the box is made of multiple triangles that will overlap
   * when drawn and we don't control the order they are drawn in, we
   * enable depth testing to make sure that triangles that shouldn't
   * be visible get culled by the GPU. */
  cogl_depth_state_init (&depth_state);
  cogl_depth_state_set_test_enabled (&depth_state, TRUE);

  cogl_pipeline_set_depth_state (data.crate_pipeline, &depth_state, NULL);

  /* Setup a Pango font map and context */

  data.pango_font_map = COGL_PANGO_FONT_MAP (cogl_pango_font_map_new (ctx));

  cogl_pango_font_map_set_use_mipmapping (data.pango_font_map, TRUE);

  data.pango_context =
    pango_font_map_create_context (PANGO_FONT_MAP (data.pango_font_map));

  data.pango_font_desc = pango_font_description_new ();
  pango_font_description_set_family (data.pango_font_desc, "Sans");
  pango_font_description_set_size (data.pango_font_desc, 30 * PANGO_SCALE);

  /* Setup the "Hello Cogl" text */

  data.hello_label = pango_layout_new (data.pango_context);
  pango_layout_set_font_description (data.hello_label, data.pango_font_desc);
  pango_layout_set_text (data.hello_label, "Hello Cogl", -1);

  pango_layout_get_extents (data.hello_label, NULL, &hello_label_size);
  data.hello_label_width = PANGO_PIXELS (hello_label_size.width);
  data.hello_label_height = PANGO_PIXELS (hello_label_size.height);

  data.swap_ready = TRUE;

  has_swap_notify =
    cogl_has_feature (ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT);

  if (has_swap_notify)
    cogl_onscreen_add_swap_buffers_callback (COGL_ONSCREEN (fb),
                                             swap_notify_cb,
                                             &data);

  while (1)
    {
      CoglPollFD *poll_fds;
      int n_poll_fds;
      int64_t timeout;

      if (data.swap_ready)
        {
          paint (&data);
          cogl_onscreen_swap_buffers (COGL_ONSCREEN (fb));
        }

      cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout);

      if (!has_swap_notify)
        {
          /* If the winsys doesn't support swap event notification
             then we'll just redraw constantly */
          data.swap_ready = TRUE;
          timeout = 0;
        }

      g_poll ((GPollFD *) poll_fds, n_poll_fds,
              timeout == -1 ? -1 : timeout / 1000);

      cogl_poll_dispatch (ctx, poll_fds, n_poll_fds);
    }

  return 0;
}

void AutoLockBox::paintEvent(QPaintEvent *e) {
	Painter p(this);
	if (paint(p)) return;

	paintTitle(p, lang(lng_passcode_autolock), true);
}

int CScreenSetup::exec(CMenuTarget* parent, const std::string &)
{
	neutrino_msg_t      msg;
	neutrino_msg_data_t data;

	int res = menu_return::RETURN_REPAINT;

	if (parent)
	{
		parent->hide();
	}

	x_box = 15*5;
	y_box = frameBuffer->getScreenHeight(true) / 2;

        int icol_w, icol_h;
        frameBuffer->getIconSize(NEUTRINO_ICON_BUTTON_RED, &icol_w, &icol_h);

	BoxHeight = std::max(icol_h+4, g_Font[SNeutrinoSettings::FONT_TYPE_MENU]->getHeight());
	BoxWidth = g_Font[SNeutrinoSettings::FONT_TYPE_MENU]->getRenderWidth(g_Locale->getText(LOCALE_SCREENSETUP_UPPERLEFT));

	int tmp = g_Font[SNeutrinoSettings::FONT_TYPE_MENU]->getRenderWidth(g_Locale->getText(LOCALE_SCREENSETUP_LOWERRIGHT));
	if (tmp > BoxWidth)
		BoxWidth = tmp;

	BoxWidth += 10 + icol_w;

	x_coord[0] = g_settings.screen_StartX;
	x_coord[1] = g_settings.screen_EndX;
	y_coord[0] = g_settings.screen_StartY;
	y_coord[1] = g_settings.screen_EndY;

	paint();
	frameBuffer->blit();

	selected = 0;

	uint64_t timeoutEnd = CRCInput::calcTimeoutEnd(g_settings.timing[SNeutrinoSettings::TIMING_MENU] == 0 ? 0xFFFF : g_settings.timing[SNeutrinoSettings
::TIMING_MENU]);

	bool loop=true;
	while (loop)
	{
		g_RCInput->getMsgAbsoluteTimeout( &msg, &data, &timeoutEnd, true );

		if ( msg <= CRCInput::RC_MaxRC )
			timeoutEnd = CRCInput::calcTimeoutEnd(g_settings.timing[SNeutrinoSettings::TIMING_MENU] == 0 ? 0xFFFF : g_settings.timing[SNeutrinoSettings
::TIMING_MENU]);

		switch ( msg )
		{
			case CRCInput::RC_ok:
				// abspeichern
				g_settings.screen_StartX = x_coord[0];
				g_settings.screen_EndX = x_coord[1];
				g_settings.screen_StartY = y_coord[0];
				g_settings.screen_EndY = y_coord[1];
				if(g_settings.screen_preset) {
					g_settings.screen_StartX_lcd = g_settings.screen_StartX;
					g_settings.screen_StartY_lcd = g_settings.screen_StartY;
					g_settings.screen_EndX_lcd = g_settings.screen_EndX;
					g_settings.screen_EndY_lcd = g_settings.screen_EndY;
				} else {
					g_settings.screen_StartX_crt = g_settings.screen_StartX;
					g_settings.screen_StartY_crt = g_settings.screen_StartY;
					g_settings.screen_EndX_crt = g_settings.screen_EndX;
					g_settings.screen_EndY_crt = g_settings.screen_EndY;
				}
				if (g_InfoViewer) /* recalc infobar position */
					g_InfoViewer->start();
				loop = false;
				break;

			case CRCInput::RC_home:
				if ( ( ( g_settings.screen_StartX != x_coord[0] ) ||
							( g_settings.screen_EndX != x_coord[1] ) ||
							( g_settings.screen_StartY != y_coord[0] ) ||
							( g_settings.screen_EndY != y_coord[1] ) ) &&
						(ShowMsg(LOCALE_VIDEOMENU_SCREENSETUP, LOCALE_MESSAGEBOX_DISCARD, CMessageBox::mbrYes, CMessageBox::mbYes | CMessageBox::mbCancel) == CMessageBox::mbrCancel))
					break;

			case CRCInput::RC_timeout:
				loop = false;
				break;

			case CRCInput::RC_red:
			case CRCInput::RC_green:
				{
					selected = ( msg == CRCInput::RC_green ) ? 1 : 0 ;

					frameBuffer->paintBoxRel(x_box, y_box, BoxWidth, BoxHeight,
						(selected == 0)?COL_MENUCONTENTSELECTED_PLUS_0:COL_MENUCONTENT_PLUS_0);
					frameBuffer->paintBoxRel(x_box, y_box + BoxHeight, BoxWidth, BoxHeight,
						(selected ==1 )?COL_MENUCONTENTSELECTED_PLUS_0:COL_MENUCONTENT_PLUS_0);

					paintIcons(selected);
					break;
				}
			case CRCInput::RC_up:
			{
//.........这里部分代码省略.........

//.........这里部分代码省略.........
      std::cout << "culling: AUTO" << std::endl;
    }
  }
  else if ( propertyId == PID_Key_C )
  {
    if ( getValue<bool>( propertyId) )
    {
      bool enabled = !getSceneRenderer()->isCullingEnabled();
      getSceneRenderer()->setCullingEnabled(enabled);
      std::cout << "culling " << (enabled ? "enabled" : "disabled") << std::endl;
    }
  }
  else if ( propertyId == PID_Key_B ) // Toggle Bindless
  {
    if ( getValue<bool>( propertyId ) )
    {
      m_engineBindless = !m_engineBindless;
      updateSceneRendererEngine();
    }
  }
  else if ( propertyId == PID_Key_G ) // attrib generic
  {
    if ( getValue<bool>( propertyId ) )
    {
      m_attributeType = AttributeType::GENERIC;
      updateSceneRendererEngine();
    }
  }

  else if ( propertyId == PID_Key_V ) // attrib VAO
  {
    if ( getValue<bool>( propertyId ) )
    {
      m_attributeType = AttributeType::VAO;
      updateSceneRendererEngine();
    }
  }

  else if ( propertyId == PID_Key_A ) // Toggle attrib VAB
  {
    if ( getValue<bool>( propertyId ) )
    {
      m_attributeType = AttributeType::VAB;
      updateSceneRendererEngine();
    }
  }
  else if ( propertyId == PID_Key_Escape )
  {
    if ( getValue<bool>( propertyId ) )
    {
      glutLeaveMainLoop();
    }
  }
  else if ( propertyId == PID_Key_F9 )
  {
    if ( getValue<bool>( propertyId ) )
    {
      std::cout << "Setting shadermanager: " << "uniform" << std::endl;
      m_shaderManager = dp::fx::Manager::UNIFORM;
    }
  }
  else if ( propertyId == PID_Key_F10 )
  {
    if ( getValue<bool>( propertyId ) )
    {
      std::cout << "Setting shadermanager: " << "uniform buffer object" << std::endl;
      m_shaderManager = dp::fx::Manager::UNIFORM_BUFFER_OBJECT_RIX;
    }
  }
  else if ( propertyId == PID_Key_F11 )
  {
    if ( getValue<bool>( propertyId ) )
    {
      std::cout << "Setting shadermanager: " << "shaderbufferload" << std::endl;
      m_shaderManager = dp::fx::Manager::SHADERBUFFER;
    }
  }
  else if ( propertyId == PID_Key_F12 )
  {
    if ( getValue<bool>( propertyId ) )
    {
      std::cout << "Setting shadermanager: " << "shader storage buffer object" << std::endl;
      m_shaderManager = dp::fx::Manager::SHADER_STORAGE_BUFFER_OBJECT;
    }
  }
  else if ( propertyId == PID_Key_P )
  {
    if ( getValue<bool>( propertyId ) )
    {
      dp::util::FrameProfiler::instance().setEnabled( !dp::util::FrameProfiler::instance().isEnabled() );
    }
  }
  else if ( propertyId == PID_Key_Space )
  {
    if ( getValue<bool>( propertyId ) )
    {
      paint();
    }
  }
}

void Drawboard::paintEvent(QPaintEvent* event)
{
    QPainter paint(this);
    paint.drawPixmap(event->rect(), *buffer, event->rect());
    drawTool(&paint);
}