-// the space that it takes for the screen to start scrolling, regarding
-// screen bounds (in pixels)
-#define X_SPACE (400-16)
-// the time it takes to move the camera (in ms)
-#define CHANGE_DIR_SCROLL_SPEED 2000
-
-/* This functions takes cares of the scrolling */
-void World::scrolling(double frame_ratio)
-{
- if(level->hor_autoscroll_speed)
- {
- scroll_x += level->hor_autoscroll_speed * frame_ratio;
- return;
- }
-
- int tux_pos_x = (int)(tux.base.x + (tux.base.width/2));
-
- if (level->back_scrolling || debug_mode)
- {
- if(tux.old_dir != tux.dir && level->back_scrolling)
- scrolling_timer.start(CHANGE_DIR_SCROLL_SPEED);
-
- if(scrolling_timer.check())
- {
- float final_scroll_x;
- if (tux.physic.get_velocity_x() > 0)
- final_scroll_x = tux_pos_x - (screen->w - X_SPACE);
- else if (tux.physic.get_velocity_x() < 0)
- final_scroll_x = tux_pos_x - X_SPACE;
- else
- {
- if (tux.dir == RIGHT)
- final_scroll_x = tux_pos_x - (screen->w - X_SPACE);
- else if (tux.dir == LEFT && level->back_scrolling)
- final_scroll_x = tux_pos_x - X_SPACE;
- }
-
- scroll_x += (final_scroll_x - scroll_x)
- / (frame_ratio * (CHANGE_DIR_SCROLL_SPEED / 100))
- + (tux.physic.get_velocity_x() * frame_ratio + tux.physic.get_acceleration_x() * frame_ratio * frame_ratio);
- // std::cerr << tux_pos_x << " " << final_scroll_x << " " << scroll_x << std::endl;
-
- }
- else
- {
- if (tux.physic.get_velocity_x() > 0 && scroll_x < tux_pos_x - (screen->w - X_SPACE))
- scroll_x = tux_pos_x - (screen->w - X_SPACE);
- else if (tux.physic.get_velocity_x() < 0 && scroll_x > tux_pos_x - X_SPACE && level->back_scrolling)
- scroll_x = tux_pos_x - X_SPACE;
- else
- {
- if (tux.dir == RIGHT && scroll_x < tux_pos_x - (screen->w - X_SPACE))
- scroll_x = tux_pos_x - (screen->w - X_SPACE);
- else if (tux.dir == LEFT && scroll_x > tux_pos_x - X_SPACE && level->back_scrolling)
- scroll_x = tux_pos_x - X_SPACE;
- }
- }
- }
-
- else /*no debug*/
- {
- if (tux.physic.get_velocity_x() > 0 && scroll_x < tux_pos_x - (screen->w - X_SPACE))
- scroll_x = tux_pos_x - (screen->w - X_SPACE);
- else if (tux.physic.get_velocity_x() < 0 && scroll_x > tux_pos_x - X_SPACE && level->back_scrolling)
- scroll_x = tux_pos_x - X_SPACE;
- else
- {
- if (tux.dir == RIGHT && scroll_x < tux_pos_x - (screen->w - X_SPACE))
- scroll_x = tux_pos_x - (screen->w - X_SPACE);
- else if (tux.dir == LEFT && scroll_x > tux_pos_x - X_SPACE && level->back_scrolling)
- scroll_x = tux_pos_x - X_SPACE;
- }
-
- }
-
- // this code prevent the screen to scroll before the start or after the level's end
- if(scroll_x < 0)
- scroll_x = 0;
- if(scroll_x > level->width * 32 - screen->w)
- scroll_x = level->width * 32 - screen->w;
-}
-