// -----------------------------------------------------------------------------------------------------------------
private void Update()
{
// Turn right
if (Input.GetKeyDown("right"))
{
m_direction = CTile.DIR_EX[(int)m_direction].m_next;
// Turn left
}
else if (Input.GetKeyDown("left"))
{
m_direction = CTile.DIR_EX[(int)m_direction].m_prev;
}
// Current player position & underlying tile
Vector3 cur_pos = m_player.transform.position;
CTile cur_tile = m_level.GetTileByCoord(cur_pos.x, cur_pos.z);
// Update compas
m_compas.SetPosition(cur_pos);
// Active tile is changed
if (cur_tile != m_prev_frame_tile && m_prev_frame_tile != null)
{
// Update current and previously visited tiles
m_prev_tile = m_prev_frame_tile;
m_level_tags.SetTag(m_prev_tile, (int)CTile.ETag.T_VISITED);
m_level_tags.SetTag(cur_tile, (int)CTile.ETag.T_CURRENT);
// Update destination path
m_level_tags.ClearTag((int)CTile.ETag.T_DEST_PATH);
CTile t_glow = cur_tile;
while (true)
{
t_glow = t_glow.GetNeighbor(m_direction);
if (t_glow == null ||
!m_level_tags.SetTag(t_glow, (int)CTile.ETag.T_DEST_PATH))
{
break;
}
}
// Update trail - finalize border vertex between tiles
Vector3 tile_border = m_prev_frame_tile.GetPosition() + (cur_tile.GetPosition() - m_prev_frame_tile.GetPosition()) / 2;
tile_border.y += 0.5f;
m_path.AddVertex(tile_border, true);
// Active tile was not changed
}
else
{
// Update trail - update head vertex
m_path.AddVertex(cur_pos, false);
}
// Destination tile is reached
CTile.ERelPosition rel_pos = cur_tile.GetRelPosition(m_dest_tile, m_direction);
if (rel_pos == CTile.ERelPosition.RP_CURRENT ||
rel_pos == CTile.ERelPosition.RP_BEHIND ||
rel_pos == CTile.ERelPosition.RP_NONE)
{
m_direction = SetPlayerDestination(cur_tile, m_direction);
m_prev_frame_tile = cur_tile;
}
// Save tile of previous frame
m_prev_frame_tile = cur_tile;
// Eat apple
if (m_level_tags.IsTagSet(cur_tile, (int)CTile.ETag.T_APPLE))
{
m_level_tags.UnsetTag(cur_tile, (int)CTile.ETag.T_APPLE);
m_tail.AddSegment();
m_config.score++;
}
// Create new apple
if (m_level_tags.GetTagCnt((int)CTile.ETag.T_APPLE) == 0)
{
CTile t = CreateApple();
m_compas.SetDestination(t.GetPosition());
}
// Apply level changeset
Hashtable changeset = m_level_tags.GetChangeset();
if (changeset.Count > 0)
{
// Update all tiles in changeset
foreach (DictionaryEntry entry in changeset)
{
CTile tile = (CTile)entry.Key;
UpdateLevelMaterial(tile);
UpdateLevelGameplay(tile);
}
// Clear changeset
changeset.Clear();
}
}
// -----------------------------------------------------------------------------------------------------------------
public CTile.ERelPosition GetRelPosition(CTile target, CTile.EDirection dir)
{
// Easy case - target is reached
CTile.ERelPosition rel_pos = CTile.ERelPosition.RP_NONE;
if (target == this)
{
rel_pos = CTile.ERelPosition.RP_CURRENT;
// Medium case - horizontal/vertical
}
else if (dir == CTile.EDirection.DIR_3) // 3: right
{
if (target.m_idx.y == m_idx.y)
{
rel_pos = (target.m_idx.x > m_idx.x) ?
CTile.ERelPosition.RP_FORWARD :
CTile.ERelPosition.RP_BEHIND;
}
}
else if (dir == CTile.EDirection.DIR_9) // 9: left
{
if (target.m_idx.y == m_idx.y)
{
rel_pos = (target.m_idx.x < m_idx.x) ?
CTile.ERelPosition.RP_FORWARD :
CTile.ERelPosition.RP_BEHIND;
}
// Hard case - diagonal
}
else
{
// Diff to destination
int z_diff = target.m_idx.y - m_idx.y;
int x_diff = target.m_idx.x - m_idx.x;
// Initial relative position is set to behind and offset is set to negative
int offset = (z_diff < 0) ? z_diff : -z_diff;
rel_pos = CTile.ERelPosition.RP_BEHIND;
// Update relative position
if (dir == CTile.EDirection.DIR_1) // 1: right - up
{
if (x_diff >= 0 && z_diff > 0)
{
rel_pos = CTile.ERelPosition.RP_FORWARD;
}
}
else if (dir == CTile.EDirection.DIR_5) // 5: right - down
{
if (x_diff >= 0 && z_diff < 0)
{
rel_pos = CTile.ERelPosition.RP_FORWARD;
}
}
else if (dir == CTile.EDirection.DIR_7) // 7: left - down
{
if (x_diff <= 0 && z_diff < 0)
{
rel_pos = CTile.ERelPosition.RP_FORWARD;
}
}
else if (dir == CTile.EDirection.DIR_11) // 11: left - up
{
if (x_diff <= 0 && z_diff > 0)
{
rel_pos = CTile.ERelPosition.RP_FORWARD;
}
}
else
{
utils.Assert(true, "Invalid diff"); // ???: should not happen
}
// If relative position was changed then offset should be inverted
if (rel_pos == CTile.ERelPosition.RP_FORWARD)
{
offset = -offset;
}
// Find coordinates of correct tile with given offset
int x = 0, z = 0;
GetTilePosXZByOffset(dir, offset, ref x, ref z);
// If correct tile is not our target tile then ignore
if (x != target.m_idx.x || z != target.m_idx.y)
{
rel_pos = CTile.ERelPosition.RP_NONE;
}
}
return(rel_pos);
}
