private void UpdateInvaders(UpdateParams uparams)
{
for (int i = mInvaders.Count - 1; i > -1; --i)
{
Invader entity = mInvaders[i];
entity.Update(uparams.Elapsed);
if (entity.State != InvaderState.Alive)
{
mInvaders.RemoveAt(i);
if (entity.State == InvaderState.MadeIt)
{
Player.InvaderGotThrough(entity);
if (!Player.IsAlive)
{
GameOver = true;
i = -1;
}
}
else
{
Player.CollectSpoils(entity);
}
}
}
}
private void ProcessInput(UpdateParams uparams)
{
// if the user selects a group of cells
if (uparams.Input.SelectObject)
{
// process the selection click
OnSelectClick(uparams);
}
bool selectedPieceValid = mSelectedPiece != null && mSelectedPiece.Selected;
if (uparams.Input.SellRequested && selectedPieceValid)
{
mSelectedPiece.Sell();
}
if (uparams.Input.UpgradeRequested && selectedPieceValid)
{
mSelectedPiece.Upgrade();
}
if (uparams.Input.ClearSelections)
{
lstPieces.SelectedIndex = -1;
ClearSelection();
}
if (uparams.Input.EctoplasTransmaterPort)
{
Player.TimeUntilInvadersArrive = TimeSpan.Zero;
}
}
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 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 void UpdateSelection(UpdateParams uparams)
{
// the user has something selected in the list. Our goal is to show the user the
// available places where their selection can be set.
// update the current piece selection
UpdatePiecePlacement(uparams);
// update the flashing cells
UpdateFlashingCells(uparams);
}
private Piece RetrieveCurrentHoveredPiece(UpdateParams uparams)
{
Piece piece = null;
if (lstPieces.HoverIndex > -1)
{
// set the hovered piece
piece = lstPieces.Items[lstPieces.HoverIndex].Value as Piece;
}
return(piece);
}
private void UpdateSelectionList(UpdateParams uparams)
{
// show the list and see if we can select a piece
lstPieces.Visible = true;
foreach (ListBoxItem item in lstPieces.Items)
{
Piece piece = item.Value as Piece;
if (piece != null)
{
// this item can only be selected if the player has enough cash for it
item.CanSelect = Player.EnoughCashFor(piece);
}
}
}
private void UpdateSelectedPieceRadius(UpdateParams uparams)
{
Piece piece = RetrieveCurrentSelectedPiece(uparams);
currentArea = GsRectangle.Empty;
bool validPiece = (piece != null) && (piece.State == PieceState.Idle);
if (validPiece && !piece.Size.IsEmpty)
{
float dx = piece.Width * .5f;
float dy = piece.Height * .5f;
currentArea = new GsRectangle(piece.X + dx, piece.Y + dy, piece.Radius, piece.Radius);
}
}
private void UpdateFlashingCells(UpdateParams uparams)
{
List <GridCell> keys = cellsToFlash.Keys.ToList();
foreach (GridCell cell in keys)
{
double amount = cellsToFlash[cell];
amount -= uparams.Elapsed.TotalSeconds;
cellsToFlash[cell] = amount;
if (amount <= 0)
{
// remove the cell so it doesn't get drawn OR updated
cellsToFlash.Remove(cell);
}
}
}
private void UpdateDescriptionText(UpdateParams uparams)
{
Piece piece = RetrieveCurrentInformationPiece(uparams);
Invader invader = RetrieveCurrentSelectedInvader(uparams);
txtDescription.Visible = false;
btnSell.Visible = (piece != null & mSelectedPiece != null && mSelectedPiece.Equals(piece));
btnUpgrade.Visible = btnSell.Visible;
btnUpgrade.Enabled = btnSell.Visible && piece.CanUpgrade;
if (piece != null || invader != null)
{
txtDescription.Visible = true;
ITextDisplay provider = (piece != null ? (ITextDisplay)piece : (ITextDisplay)invader);
DisplayDescriptionForTextProvider(provider);
DisplayCaptionForTextProvider(provider);
}
}
public void Update(GuiInputState state, TimeSpan span)
{
// update the visible pieces so they get updated right away
UpdateVisiblePieces();
// immediately add the waves of invaders (if necessary)
AddInvaders();
// update the gui
mGui.Update(state, span);
// construct new updata parameters for the functions
UpdateParams uparams = new UpdateParams(span, InputProvider.GetState(), MiddleOffset + Position);
// update the list
UpdateSelectionList(uparams);
// update the selection the user has made
UpdateSelection(uparams);
// process any requests from the user for a piece
ProcessInput(uparams);
// update the description text that is displayed
UpdateDescriptionText(uparams);
// update the radius around the selected piece
UpdateSelectedPieceRadius(uparams);
// update all pieces
UpdatePieces(uparams);
// update all invaliders
UpdateInvaders(uparams);
// update the piece targets
UpdatePieceTargets(uparams);
// update all projectiles
UpdateProjectiles(uparams);
// finally, update the time
Player.TimeUntilInvadersArrive -= span;
}
private Piece RetrieveCurrentSelectedPiece(UpdateParams uparams)
{
Piece piece = null;
bool validSelection = lstPieces.SelectedIndex > -1 || mSelectedPiece != null;
if (validSelection)
{
piece = mSelectedPiece;
if (piece == null)
{
piece = lstPieces.Items[lstPieces.SelectedIndex].Value as Piece;
if (mSelection != null)
{
piece.Bounds = mSelection.Bounds;
}
}
}
return(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);
}
}
}
private Piece RetrieveCurrentInformationPiece(UpdateParams uparams)
{
Piece retval = null;
// The hovered piece information is NOT saved, so we only care about which
// piece is being hovered over before displaying text. Note that the hovered piece will
// take precendence over the selected invader. If an invader is selected,
// and we hover over a piece, then the piece will display it's information.
// once the player hovers out of the piece, the selected invader's information
// will come back. Also note that the hovered piece takes precedence over the currently selected
// piece.
// get the piece that's currently being hovered over
retval = RetrieveCurrentHoveredPiece(uparams);
if (retval == null)
{
// if it's null, then get the selected piece
retval = RetrieveCurrentSelectedPiece(uparams);
}
// return whichever piece. If this is null, it means no piece is hovered or selected
return(retval);
}
private void UpdatePieces(UpdateParams uparams)
{
bool resolve = false;
for (int i = mPieces.Count - 1; i > -1; --i)
{
Piece piece = mPieces[i];
piece.Update(uparams.Elapsed);
if (piece.State == PieceState.Sold)
{
// remove the piece
mPieces.RemoveAt(i);
// if the currently selected piece is this piece, then set it to null
if (piece.Equals(mSelectedPiece))
{
mSelectedPiece = null;
}
// if we remove a piece the grid needs to be re-solved
resolve = true;
}
Projectile[] projectiles = piece.PopProjectiles();
if (piece.State == PieceState.Idle)
{
mProjectiles.AddRange(projectiles);
}
}
if (resolve)
{
SolveGrid();
}
}
private void UpdatePiecePlacement(UpdateParams uparams)
{
// set the chunk to null
mSelection.Chunk = null;
// don't place any towers if no towers are selected
if (lstPieces.SelectedIndex == -1)
{
// end any edits that are in place
mSelection.EndPlaceEdits();
return;
}
// get the mouse point
GsVector mousePt = uparams.Input.CursorPosition - uparams.Offset;
// get the current chunk
Piece piece = lstPieces.Items[lstPieces.SelectedIndex].Value as Piece;
int cellsNeeded = (int)piece.Grouping;
float width = CellWidth * cellsNeeded;
float height = CellHeight * cellsNeeded;
// compute the data needed
GsVector offset = GsVector.Zero;
GsRectangle cursorBox = Calculator.CreateBoxAroundPoint(mousePt, offset, width, height);
GridCell[] cells = GetCellsWithCenterContainedIn(Grid, cursorBox, offset);
if (cells.Length > 0)
{
GsRectangle bounds = ComputeBounds(cells, CellWidth, CellHeight);
mSelection.Chunk = new GridCellChunk
{
Bounds = bounds,
Cells = cells,
Valid = (cells.Length == (cellsNeeded * cellsNeeded)) && Array.TrueForAll <GridCell>(cells, GridCell.CellIsAvailable),
};
}
// set the bounds of the selection to be the bounds of the chunk
mSelection.Bounds = GsRectangle.Empty;
if (mSelection.Chunk != null)
{
mSelection.Bounds = mSelection.Chunk.Bounds;
}
// if the mouse is down and we haven't added any chunks, then make this the starting chunk
if (uparams.Input.SelectPressed)
{
// if we don't have a starting chunk, then start it
if (mSelection.StartingChunk == null)
{
mSelection.StartingChunk = mSelection.Chunk;
}
// clear the bounds
mSelection.Bounds = GsRectangle.Empty;
// get the starting chunk for easy access
GridCellChunk startingChunk = mSelection.StartingChunk;
// if the starting chunk is null, or invalid, then don't do this
if (startingChunk != null && startingChunk.Valid)
{
// basically, we need to determine how many chunks to add to the chunks currently being
// edited. We can do this by first determining where the cursor box is. If it is below us
// (meaning the top of the cursor box is greater than the bottom of the starting chunk
// box), then we just need to count and see how many cells away the [0,0] cell from the cursor
// box is away from the starting chunk box. So, "int countNeeded = cellsAwayFromStartingBox -
// (cellsAwayFromStartingBox % cellsNeeded". This will tell us how many cells we should collect
// in each direction (horz and vert). Then, we divide that number by cellsNeeded to get the number
// of chunks. Then, we simply assemble the chunks and add them to a collection. The same logic is
// done if the cursor box is horizontally away.
// clear away the chunks being edited
mSelection.ClearEdits();
// figure out if the cursor is in the vert plane, or the horz plane
var rect = startingChunk.Bounds;
var center = rect.Location;
center.X += rect.Width / 2;
center.Y += rect.Height / 2;
float dy = mousePt.Y - center.Y;
float dx = mousePt.X - center.X;
float aDy = Math.Abs(dy);
float aDx = Math.Abs(dx);
if (aDy > aDx)
{
// the difference in the y direction is greater. If dy > 0, this means that the cursor is BELOW the starting chunk.
// If dy < 0, this means that the cursor is ABOVE the starting chunk. If dy == 0, then we don't care
if (dy != 0)
{
AddChunksVert(offset, mousePt, cellsNeeded, dy < 0);
}
}
else
{
// the difference in the x direction is greater. If dx > 0, this means that the cursor is RIGHT of the starting chunk.
// If dx < 0, this means that the cursor is LEFT of the starting chunk. Again, dx == 0, we don't care
if (dx != 0)
{
AddChunksHorz(offset, mousePt, cellsNeeded, dx < 0);
}
}
// make sure that the chunk we're drawing is the starting chunk
mSelection.Chunk = startingChunk;
}
}
else
{
// if we have a starting chunk
if (mSelection.StartingChunk != null)
{
// add all the towers
foreach (GridCellChunk editedChunk in mSelection.Edits)
{
// see if we have enough funds
bool enoughFunds = Player.EnoughCashFor(piece);
// create a default invalid message
string invalidMessage = enoughFunds ? "Cell(s) not available" : "Not enough funds";
// update the validity of the chunk
editedChunk.Valid &= enoughFunds;
// if the chunk is valid, then attempt to place it.
if (editedChunk.Valid)
{
// build the piece in the location
Piece tower = piece.BuildFromChunk(gridBounds, editedChunk);
mPieces.Add(tower);
// if we can't get through
if (!AssertCanGetThrough(tower))
{
// remove the piece
int last = mPieces.Count - 1;
tower.SellInstant();
mPieces.RemoveAt(last);
// re-solve the grid
SolveGrid();
// the piece is no longer valid
editedChunk.Valid = false;
// blocking
invalidMessage = "Blocking Invaders";
}
}
if (!editedChunk.Valid)
{
// add a quick message
//MessageComponent.AddMessage(invalidMessage,
// Position + new GsVector((Width / 2f), (Height / 2f)),
// 800,
// true);
// a chunk can be invalid if all the cells don't have towers.
// Find any cells that have towers, and flash them red
foreach (GridCell cell in editedChunk.Cells)
{
if (cell.IsWalkable)
{
// we use a dictionary so we don't add the same cell twice. We also
// reset the time that the cell is flashing.
cellsToFlash[cell] = SecondsToFlashCell;
}
}
}
}
}
mSelection.EndPlaceEdits();
}
}
private void UpdatePieceTargets(UpdateParams uparams)
{
var offset = MiddleOffset + Position;
mPieces.ForEach(piece => piece.ChooseTarget(mInvaders, offset));
}
private void CheckCollisions(Projectile projectile, GsPolygon projectilePolygon, UpdateParams uparams)
{
// if the projectile parent is null, then don't worry about it
if (projectile.Parent == null)
{
return;
}
// cycle through all of the entities
for (int i = mInvaders.Count - 1; i > -1; --i)
{
// get the entity
Invader invader = mInvaders[i];
// if this invader isn't the type of invader that the projectile can hit, then keep going
if (!projectile.CanHit(invader))
{
continue;
}
// get the entity polygon
GsPolygon entityPolygon = invader.GetHull(uparams.Offset);
// let the entity and polygon know they were attacked
if (entityPolygon.IntersectsWith(projectilePolygon))
{
// let the projectile know it collided
projectile.OnCollidedWithInvader(invader);
// let the entity know it was attacked
invader.OnAttackedByProjectile(projectile);
}
}
}
