private Invader RetrieveCurrentSelectedInvader(UpdateParams uparams)
{
Invader retval = mSelectedInvader;
if (retval != null && retval.State != InvaderState.Alive)
{
retval = null;
}
if (uparams.Input.SelectObject)
{
// if they click, then reset the selection
retval = null;
for (int i = mInvaders.Count - 1; i > -1; --i)
{
Invader invader = mInvaders[i];
if (invader.State == InvaderState.Alive)
{
GsRectangle box = invader.GetBoundingBox(uparams.Offset);
if (box.Contains(uparams.Input.CursorPosition))
{
retval = invader;
i = -1;
}
}
}
}
mSelectedInvader = retval;
return(retval);
}
private static GridCell[] GetCellsWithCenterContainedIn(GridCell[,] grid, GsRectangle box, GsVector cellOffset)
{
int ColCount = grid.GetLength(0);
int RowCount = grid.GetLength(1);
List <GridCell> cells = new List <GridCell>(100);
for (int c = 0; c < ColCount; ++c)
{
for (int r = 0; r < RowCount; ++r)
{
GridCell cell = grid[c, r];
GsVector center = cell.Bounds.Location + cellOffset;
center.X += (cell.Width / 2f);
center.Y += (cell.Height / 2f);
if (box.Contains(center))
{
cells.Add(cell);
}
}
}
return(cells.ToArray());
}
private void OnSelectClick(UpdateParams uparams)
{
// ignore this function if the buttons have the mouse
if (btnSell.MouseCaptured || btnUpgrade.MouseCaptured)
{
return;
}
// always clear the current selection
ClearSelection();
// if the user has no selection, then select the piece
if (lstPieces.SelectedIndex == -1)
{
// the piece is invalid. Find the piece that they clicked on.
bool found = false;
for (int i = 0; !found && i < mPieces.Count; ++i)
{
Piece piece = mPieces[i];
GsRectangle box = new GsRectangle(piece.Position + uparams.Offset, piece.Size);
if (box.Contains(uparams.Input.CursorPosition))
{
// set selection
found = true;
SetSelection(piece);
}
}
}
}
private void UpdateProjectiles(UpdateParams uparams)
{
float dx = CellWidth * 2f;
float dy = CellHeight * 2f;
GsRectangle viewport = new GsRectangle(X - dx, Y - dy, Width + dx, Height + dy);
for (int i = mProjectiles.Count - 1; i > -1; --i)
{
// get the projectile
Projectile projectile = mProjectiles[i];
// update the projectile data
projectile.Update(uparams.Elapsed);
// get the polygon data
GsPolygon polygon = projectile.GetHull(uparams.Offset);
// if the projectile is still alive, check to see if it went out of bounds
if (projectile.IsAlive)
{
bool projectileIntersectsWithBounds = viewport.IntersectsWith(projectile.Bounds);
bool projectileInsideBounds = viewport.Contains(projectile.Bounds);
projectile.IsAlive = projectile.StayAlive || (projectileInsideBounds || projectileIntersectsWithBounds);
}
// if the projectile is still alive, check to see if it hit anything
if (projectile.IsAlive)
{
CheckCollisions(projectile, polygon, uparams);
}
// if the projectile is dead, then remove it from the list
if (!projectile.IsAlive)
{
mProjectiles.RemoveAt(i);
OnProjectileRemoved(projectile);
}
}
}