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///////////////////////////////////// CONSTRUCTOR \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
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//Pre: Row, Column, and the tile type for this tile
//Post: The Tile is created using the row, column, and tile type
//Desc: A constructor for the current tile
public Tile(int row, int column, TileType tileType)
{
//Sets the current row, column, and tile type
Row = row;
Column = column;
CurrentTileType = tileType;
//Calculates the X and Y position of the current tile
CalcPostion();
//If the current tile is a wall tile
if (CurrentTileType == TileType.Wall)
{
//Sets four index's to the lines array representing four lines to the tile
Lines = new RaycastLine[4];
//Sets the lines for raycasting
Lines[0] = new RaycastLine(true, false, new Vector2(PositionRect.X, PositionRect.Y),
new Vector2(PositionRect.X, PositionRect.Y + PositionRect.Height));
Lines[1] = new RaycastLine(true, false, new Vector2(PositionRect.X + PositionRect.Width, PositionRect.Y),
new Vector2(PositionRect.X + PositionRect.Width, PositionRect.Y + PositionRect.Height));
Lines[2] = new RaycastLine(false, true, new Vector2(PositionRect.X, PositionRect.Y),
new Vector2(PositionRect.X + PositionRect.Width, PositionRect.Y));
Lines[3] = new RaycastLine(false, true, new Vector2(PositionRect.X, PositionRect.Y + PositionRect.Height),
new Vector2(PositionRect.X + PositionRect.Width, PositionRect.Y + PositionRect.Height));
}
//Sets the enemy to unexistant (for map creation)
EnemyExists = false;
EnemyPlaced = null;
}
//Pre: The two lines that the intersection point has to be calculated for
//Post: The intersection point between the two lines is returned
//Desc: A method for calculating the intersection point between two lines
private Vector2 CalcIntersectionPoint(RaycastLine firstLine, RaycastLine secondLine)
{
//Variables for the X and Y of the intersection point
double x = 0;
double y = 0;
//If the second line is not a vertical line
if (!secondLine.VerticalLine)
{
//If the first line is not horizontal or vertical
if (!firstLine.HorizontalLine && !firstLine.VerticalLine)
{
//Calculates the X of the intersection point
x = firstLine.LineM - secondLine.LineM;
x = (secondLine.LineB - firstLine.LineB) / x;
//Calculates the Y of the intersection point
y = (firstLine.LineM * x) + firstLine.LineB;
}
//If the first line is vertical
else if (!firstLine.HorizontalLine && firstLine.VerticalLine)
{
//Sets the X and Y of the intersection
x = firstLine.LineB;
y = secondLine.LineB;
}
}
else
{
//If the first line is not horizontal or vertical
if (!firstLine.HorizontalLine && !firstLine.VerticalLine)
{
//Calculates the Y of the intersection point
y = (firstLine.LineM * secondLine.LineB) + firstLine.LineB;
//Calculates the X of the intersection point
x = (y - firstLine.LineB) / firstLine.LineM;
}
//If the first line is horizontal
else if (firstLine.HorizontalLine && !firstLine.VerticalLine)
{
//Sets the X and Y of the intersection
x = secondLine.LineB;
y = firstLine.LineB;
}
}
//Returns the intersection point
return(new Vector2((float)x, (float)y));
}
//Pre: The player and game tiles
//Post: A boolean is returned for whether the player is in the enemy's line of sight
//Desc: A method for determining whether the enemy can see the player
private bool IsPlayerInView(Player player, Tile[,] gameTiles)
{
//Creates vectors for the player and enemy center positions
Vector2 centerPlayer = new Vector2(player.Position.X + (player.GetBounds().Width / 2), player.Position.Y + (player.GetBounds().Height / 2));
Vector2 centerEnemy = new Vector2(Position.X + (bounds.Width / 2), Position.Y + (bounds.Height / 2));
//Variable for the player's line
RaycastLine playerLine;
//If the X's and Y's for the enemy and player are not the same
if (centerPlayer.X != centerEnemy.X && centerPlayer.Y != centerEnemy.Y)
{
//Creates the line from the player to the enemy
playerLine = new RaycastLine(false, false, centerPlayer, centerEnemy);
}
//If they are the same Y values (horizontal line)
else if (centerPlayer.Y == centerEnemy.Y)
{
//Creates the line from the player to the enemy
playerLine = new RaycastLine(false, true, centerPlayer, centerEnemy);
}
//If they are the same X values (vertical line)
else
{
//Creates the line from the player to the enemy
playerLine = new RaycastLine(true, false, centerPlayer, centerEnemy);
}
//Calculates the quadrant for the enemy relative to the player
Quadrant playerQuadrant = GetQuadrant(centerPlayer, centerEnemy);
//Temp vector for storing the location of the current intersection point
Vector2 tempVector = new Vector2(0, 0);
//Boolean for whether the enemy can see the player
bool playerInView = true;
//For each tile in the game tiles array
foreach (Tile tile in gameTiles)
{
//If the current tile is a wall tile
if (tile.CurrentTileType == TileType.Wall)
{
//For each line in the tile
foreach (RaycastLine line in tile.Lines)
{
//Sets the temp vector to the current intersection point
tempVector = CalcIntersectionPoint(playerLine, line);
//Checks if the quadrant of the position relative to the player is the same quadrant as the enemy to the player
if (GetQuadrant(centerPlayer, tempVector) == playerQuadrant)
{
//If the temp vector x is between the x's of the player and enemy
if (tempVector.X >= centerPlayer.X && tempVector.X <= centerEnemy.X ||
tempVector.X >= centerEnemy.X && tempVector.X <= centerPlayer.X)
{
//If the temp vector y is between teh y's of the player and enemy
if (tempVector.Y >= centerPlayer.Y && tempVector.Y <= centerEnemy.Y ||
tempVector.Y >= centerEnemy.Y && tempVector.Y <= centerPlayer.Y)
{
//Checks if the intersection is between the bounds of the tile
if (tempVector.X >= tile.PositionRect.X && tempVector.X <= tile.PositionRect.X + tile.PositionRect.Width &&
tempVector.Y >= tile.PositionRect.Y && tempVector.Y <= tile.PositionRect.Y + tile.PositionRect.Height)
{
//Sets the player to not being in the enemies view
playerInView = false;
break;
}
}
}
}
}
//If the player is not in the enemies view
if (!playerInView)
{
//Breaks from the for each loop
break;
}
}
}
//Returns whether the player is in the enemies view
return(playerInView);
}
