C++ DrawingContext::set_translation方法代码示例

void
TextObject::draw(DrawingContext& context)
{
  context.push_transform();
  context.set_translation(Vector(0, 0));
  if(fading > 0) {
    context.set_alpha((fadetime-fading) / fadetime);
  } else if(fading < 0) {
    context.set_alpha(-fading / fadetime);
  } else if(!visible) {
    context.pop_transform();
    return;
  }

  float width  = 500;
  float height = 70;
  Vector spos = pos + get_anchor_pos(Rectf(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT),
                                     width, height, anchor);

  context.draw_filled_rect(spos, Vector(width, height),
                           Color(0.6f, 0.7f, 0.8f, 0.5f), LAYER_GUI-50);
  if (centered) {
    context.draw_center_text(font, text, spos, LAYER_GUI-40, TextObject::default_color);
  } else {
    context.draw_text(font, text, spos + Vector(10, 10), ALIGN_LEFT, LAYER_GUI-40, TextObject::default_color);
  }

  context.pop_transform();
}

void
Background::draw(DrawingContext& context)
{
  if(image.get() == NULL)
    return;
    
  int w = (int) image->get_width();
  int h = (int) image->get_height();
  int sx = int(pos.x-context.get_translation().x * speed) % w - w;
  int sy = int(pos.y-context.get_translation().y * speed_y) % h - h;
  int center_image_py = int(pos.y-context.get_translation().y * speed_y);
  int bottom_image_py = int(pos.y-context.get_translation().y * speed_y) + h;
  context.push_transform();
  context.set_translation(Vector(0, 0));
  for(int x = sx; x < SCREEN_WIDTH; x += w) {
    for(int y = sy; y < SCREEN_HEIGHT; y += h) {
      if (image_top.get() != NULL && (y < center_image_py)) {
        context.draw_surface(image_top.get(), Vector(x, y), layer);
        continue;
      } 
      if (image_bottom.get() != NULL && (y >= bottom_image_py)) {
        context.draw_surface(image_bottom.get(), Vector(x, y), layer);
        continue;
      }
      context.draw_surface(image.get(), Vector(x, y), layer);
    }
  }
  context.pop_transform();
}

void
LevelTime::draw(DrawingContext& context)
{
  context.push_transform();
  context.set_translation(Vector(0, 0));

  if ((time_left > TIME_WARNING) || (int(game_time * 2.5) % 2)) {
    std::stringstream ss;
    ss << int(time_left);
    std::string time_text = ss.str();

    if (time_surface)
    {
      float all_width = static_cast<float>(time_surface->get_width()) + Resources::normal_font->get_text_width(time_text);
      context.color().draw_surface(time_surface,
                                   Vector((static_cast<float>(context.get_width()) - all_width) / 2.0f,
                                          BORDER_Y + 1),
                                   LAYER_FOREGROUND1);
      context.color().draw_text(Resources::normal_font, time_text,
                                Vector((static_cast<float>(context.get_width()) - all_width) / 2.0f + static_cast<float>(time_surface->get_width()),
                                       BORDER_Y),
                                ALIGN_LEFT, LAYER_FOREGROUND1, LevelTime::text_color);
    }
  }

  context.pop_transform();
}

void
Sector::draw(DrawingContext& context)
{
  context.set_ambient_color( ambient_light );
  context.push_transform();
  context.set_translation(camera->get_translation());

  for(auto i = gameobjects.begin(); i != gameobjects.end(); ++i) {
    GameObjectPtr& object = *i;
    if(!object->is_valid())
      continue;

    if (draw_solids_only)
    {
      TileMap* tm = dynamic_cast<TileMap*>(object.get());
      if (tm && !tm->is_solid())
        continue;
    }

    object->draw(context);
  }

  if(show_collrects) {
    Color color(1.0f, 0.0f, 0.0f, 0.75f);
    for(auto i = moving_objects.begin(); i != moving_objects.end(); ++i) {
      MovingObject* object = *i;
      const Rectf& rect = object->get_bbox();

      context.draw_filled_rect(rect, color, LAYER_FOREGROUND1 + 10);
    }
  }

  context.pop_transform();
}

void ParticleSystem::draw(DrawingContext& context)
{
  float scrollx = context.get_translation().x;
  float scrolly = context.get_translation().y;

  context.push_transform();
  context.set_translation(Vector(max_particle_size,max_particle_size));

  std::vector<Particle*>::iterator i;
  for(i = particles.begin(); i != particles.end(); ++i) {
    Particle* particle = *i;

    // remap x,y coordinates onto screencoordinates
    Vector pos;

    pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
    if(pos.x < 0) pos.x += virtual_width;

    pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
    if(pos.y < 0) pos.y += virtual_height;

    //if(pos.x > virtual_width) pos.x -= virtual_width;
    //if(pos.y > virtual_height) pos.y -= virtual_height;

    context.draw_surface(particle->texture, pos, particle->angle, Color(1.0f, 1.0f, 1.0f), Blend(), z_pos);
  }

  context.pop_transform();
}

void ParticleSystem::draw(DrawingContext& context)
{
  if(!enabled)
    return;

  float scrollx = context.get_translation().x;
  float scrolly = context.get_translation().y;

  context.push_transform();
  context.set_translation(Vector(max_particle_size,max_particle_size));

  for(const auto& particle : particles) {
    // remap x,y coordinates onto screencoordinates
    Vector pos;

    pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
    if(pos.x < 0) pos.x += virtual_width;

    pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
    if(pos.y < 0) pos.y += virtual_height;

    //if(pos.x > virtual_width) pos.x -= virtual_width;
    //if(pos.y > virtual_height) pos.y -= virtual_height;

    context.color().draw_surface(particle->texture, pos, particle->angle, Color(1.0f, 1.0f, 1.0f), Blend(), z_pos);
  }

  context.pop_transform();
}

void
Gradient::draw(DrawingContext& context)
{
  context.push_transform();
  context.set_translation(Vector(0, 0));
  context.draw_gradient(gradient_top, gradient_bottom, layer, gradient_direction);
  context.pop_transform();
}

void
TileMap::draw(DrawingContext& context)
{
  // skip draw if current opacity is 0.0
  if (current_alpha == 0.0) return;

  context.push_transform();
  if(draw_target != DrawingContext::NORMAL) {
    context.push_target();
    context.set_target(draw_target);
  }

  if(drawing_effect != 0) context.set_drawing_effect(drawing_effect);

  if (editor_active) {
    if(current_alpha != 1.0) {
      context.set_alpha(current_alpha);
    }
  } else {
    context.set_alpha(current_alpha/2);
  }

  /* Force the translation to be an integer so that the tiles appear sharper.
   * For consistency (i.e., to avoid 1-pixel gaps), this needs to be done even
   * for solid tilemaps that are guaranteed to have speed 1.
   * FIXME Force integer translation for all graphics, not just tilemaps. */
  float trans_x = roundf(context.get_translation().x);
  float trans_y = roundf(context.get_translation().y);
  context.set_translation(Vector(int(trans_x * speed_x),
                                 int(trans_y * speed_y)));

  Rectf draw_rect = Rectf(context.get_translation(),
        context.get_translation() + Vector(SCREEN_WIDTH, SCREEN_HEIGHT));
  Rect t_draw_rect = get_tiles_overlapping(draw_rect);
  Vector start = get_tile_position(t_draw_rect.left, t_draw_rect.top);

  Vector pos;
  int tx, ty;

  for(pos.x = start.x, tx = t_draw_rect.left; tx < t_draw_rect.right; pos.x += 32, ++tx) {
    for(pos.y = start.y, ty = t_draw_rect.top; ty < t_draw_rect.bottom; pos.y += 32, ++ty) {
      int index = ty*width + tx;
      assert (index >= 0);
      assert (index < (width * height));

      if (tiles[index] == 0) continue;
      const Tile* tile = tileset->get(tiles[index]);
      assert(tile != 0);
      tile->draw(context, pos, z_pos);
    } /* for (pos y) */
  } /* for (pos x) */

  if(draw_target != DrawingContext::NORMAL) {
    context.pop_target();
  }
  context.pop_transform();
}

void
SpecialRiser::draw(DrawingContext& context)
{
  context.push_transform();
  context.set_translation(
      context.get_translation() + Vector(0, -32 + offset));
  child->draw(context);
  context.pop_transform();
}

void
Climbable::draw(DrawingContext& context)
{
  if (climbed_by && !message.empty()) {
    context.push_transform();
    context.set_translation(Vector(0, 0));
    Vector pos = Vector(0, SCREEN_HEIGHT/2 - Resources::normal_font->get_height()/2);
    context.draw_center_text(Resources::normal_font, _(message), pos, LAYER_HUD, Climbable::text_color);
    context.pop_transform();
  }
}

void
Thunderstorm::draw(DrawingContext& context)
{
  if (!flash_display_timer.started()) return;

  float alpha = 0.33f;
  context.push_transform();
  context.set_translation(Vector(0, 0));
  context.draw_filled_rect(Vector(0, 0), Vector(SCREEN_WIDTH, SCREEN_HEIGHT), Color(1, 1, 1, alpha), layer);
  context.pop_transform();

}

void
SecretAreaTrigger::draw(DrawingContext& context)
{
  if (message_timer.started()) {
    context.push_transform();
    context.set_translation(Vector(0, 0));
    Vector pos = Vector(0, SCREEN_HEIGHT/2 - Resources::normal_font->get_height()/2);
    context.draw_center_text(Resources::normal_font, message, pos, LAYER_HUD, SecretAreaTrigger::text_color);
    context.pop_transform();
  }
  if (message_timer.check()) {
    remove_me();
  }
}

void
Thunderstorm::draw(DrawingContext& context)
{
  if (!flash_display_timer.started()) return;

  float alpha = 0.33f;
  context.push_transform();
  context.set_translation(Vector(0, 0));
  context.color().draw_filled_rect(Vector(0, 0),
                                   Vector(static_cast<float>(context.get_width()),
                                          static_cast<float>(context.get_height())),
                                   Color(1, 1, 1, alpha), layer);
  context.pop_transform();

}

void
Climbable::draw(DrawingContext& context)
{
  if (climbed_by && !message.empty()) {
    context.push_transform();
    context.set_translation(Vector(0, 0));
    Vector pos = Vector(0, static_cast<float>(SCREEN_HEIGHT) / 2.0f - Resources::normal_font->get_height() / 2.0f);
    context.color().draw_center_text(Resources::normal_font, _(message), pos, LAYER_HUD, Climbable::text_color);
    context.pop_transform();
  }
  if (Editor::is_active()) {
    context.color().draw_filled_rect(bbox, Color(1.0f, 1.0f, 0.0f, 0.6f),
                             0.0f, LAYER_OBJECTS);
  }
}

void
Yeti::draw_hit_points(DrawingContext& context)
{
  if (hud_head)
  {
    context.push_transform();
    context.set_translation(Vector(0, 0));

    for (int i = 0; i < hit_points; ++i)
    {
      context.draw_surface(hud_head, Vector(BORDER_X + (i * hud_head->get_width()), BORDER_Y + 1), LAYER_FOREGROUND1);
    }

    context.pop_transform();
  }
}