public List <CollisionTile> GetCollidingTiles(Rectangle rectangle, TileInfo.SideType direction)
{
TileUnit firstPrimary = Units.GameToTile(rectangle.Side(TileInfo.OppositeSide(direction)));
TileUnit lastPrimary = Units.GameToTile(rectangle.Side(direction));
int primaryIncr = TileInfo.IsMax(direction) ? 1 : -1;
bool horizontal = TileInfo.Horizontal(direction);
TileUnit sMin = Units.GameToTile(horizontal ? rectangle.Top : rectangle.Left);
TileUnit sMid = Units.GameToTile(horizontal ? rectangle.Center.Y : rectangle.Center.X);
TileUnit sMax = Units.GameToTile(horizontal ? rectangle.Bottom : rectangle.Right);
bool sPositive = sMid - sMin < sMax - sMid;
int secondaryIncr = sPositive ? 1 : -1;
TileUnit firstSecondary = sPositive ? sMin : sMax;
TileUnit lastSecondary = sPositive ? sMin : sMax;
List <CollisionTile> collisionTiles = new List <CollisionTile>();
for (TileUnit primary = firstPrimary; primary != lastPrimary + primaryIncr; primary = Convert.ToUInt32(Convert.ToInt32(primary) + primaryIncr))
{
for (TileUnit secondary = firstSecondary; secondary != lastSecondary + secondaryIncr; secondary = Convert.ToUInt32(Convert.ToInt32(secondary) + secondaryIncr))
{
TileUnit row = !horizontal ? primary : secondary;
TileUnit col = horizontal ? primary : secondary;
collisionTiles.Add(new CollisionTile(row, col, tiles[Convert.ToInt32(row)][Convert.ToInt32(col)].tileType));
}
}
return(collisionTiles);
}
/// <summary>
///
/// </summary>
/// <param name="side">The side of the tile that is being collided with</param>
/// <param name="perpendicularPosition">The position on the tile on the opposite axis of side</param>
/// <param name="leadingPosition">Position of the leading edge of the colliding entity</param>
/// <param name="shouldTestSlopes">whether slopes should be considered for collision</param>
/// <returns>
/// isColliding is true if there was a collision
/// Returns the position of the collision on the same axis of side
/// </returns>
public TestCollisionInfo TestCollision(TileInfo.SideType side, GameUnit perpendicularPosition,
GameUnit leadingPosition, bool shouldTestSlopes)
{
TestCollisionInfo info = new TestCollisionInfo(false, leadingPosition);
if (tileType[(int)TileInfo.TileFlag.Wall])
{
info.isColliding = true;
if (side == TileInfo.SideType.TopSide)
{
info.position = Units.TileToGame(row);
}
else if (side == TileInfo.SideType.BottomSide)
{
info.position = Units.TileToGame(row + 1);
}
else if (side == TileInfo.SideType.LeftSide)
{
info.position = Units.TileToGame(col);
}
else
{
info.position = Units.TileToGame(col + 1);
}
}
else if (shouldTestSlopes && tileType[(int)TileInfo.TileFlag.Slope] &&
!tileType[(int)TileInfo.SlopeFlagFromSide(side)])
{
GameUnit row = Units.TileToGame(this.row);
GameUnit col = Units.TileToGame(this.col);
float slope = GetSlope(tileType);
GameUnit offset = GetOffset(tileType);
GameUnit calculatedPosition = TileInfo.Vertical(side) ?
slope * (perpendicularPosition - col) + offset + row :
(perpendicularPosition - row - offset) / slope + col;
bool isColliding = TileInfo.IsMax(side) ?
leadingPosition <= calculatedPosition :
leadingPosition >= calculatedPosition;
info.isColliding = isColliding;
info.position = calculatedPosition;
}
return(info);
}