public bool CollidesWith(CollisionBody other)
{
if (this.Shape == ShapeType.Circle && other.Shape == ShapeType.Circle)
{
CircleBody a = (CircleBody)this;
CircleBody b = (CircleBody)other;
return(Vector2.Distance(this.Position, other.Position) <= a.Radius + b.Radius);
}
else if (this.Shape == ShapeType.Circle && other.Shape == ShapeType.Rectangle)
{
return(RectCircCollision((CircleBody)this, (RectangleBody)other));
}
else if (this.Shape == ShapeType.Rectangle && other.Shape == ShapeType.Circle)
{
return(RectCircCollision((CircleBody)other, (RectangleBody)this));
}
else if (this.Shape == ShapeType.Rectangle && other.Shape == ShapeType.Rectangle)
{
RectangleBody a = (RectangleBody)this;
RectangleBody b = (RectangleBody)other;
return((a.Position.X <= b.Position.X + b.Size.X || a.Position.X + a.Size.X >= b.Position.X) &&
(a.Position.Y <= b.Position.Y + b.Size.Y || a.Position.Y + a.Size.Y >= b.Position.Y));
}
else
{
throw new NotImplementedException("Attempted collision with a shape that doesn't exist");
}
}
private bool RectCircCollision(CircleBody a, RectangleBody b)
{
float nearestX = Clamp(a.Position.X, b.Position.X, b.Position.X + b.Size.X);
float nearestY = Clamp(a.Position.Y, b.Position.Y, b.Position.Y + b.Size.Y);
Vector2 nearestPoint = new Vector2(nearestX, nearestY);
return(Vector2.Distance(nearestPoint, a.Position) <= a.Radius);
}
public Dictionary <uint, CollisionBody> GetPotentialCollisions(CollisionBody toCheck)
{
int xMin = 0;
int xMax = 0;
int yMin = 0;
int yMax = 0;
if (toCheck.Shape == CollisionBody.ShapeType.Circle)
{
CircleBody body = (CircleBody)toCheck;
xMin = ((int)(Math.Max(body.Position.X - body.Radius / 2, 0)) / tileSize);
xMax = (int)(Math.Min(body.Position.X + body.Radius / 2, maxWidth - 1)) / tileSize;
yMin = ((int)(Math.Max(body.Position.Y - body.Radius / 2, 0)) / tileSize);
yMax = (int)(Math.Min(body.Position.Y + body.Radius / 2, maxHeight - 1)) / tileSize;
}
else if (toCheck.Shape == CollisionBody.ShapeType.Rectangle)
{
RectangleBody body = (RectangleBody)toCheck;
xMin = ((int)(Math.Max(body.Position.X, 0)) / tileSize);
xMax = (int)(Math.Min(body.Position.X + body.Size.X, 49)) / tileSize;
yMin = ((int)(Math.Max(body.Position.Y, 0)) / tileSize);
yMax = (int)(Math.Min(body.Position.Y + body.Size.Y, 49)) / tileSize;
}
// Get every possible CollisionBody
Dictionary <uint, CollisionBody> potentials = new Dictionary <uint, CollisionBody>();
for (int y = yMin; y <= yMax; y++)
{
for (int x = xMin; x <= xMax; x++)
{
foreach (CollisionBody c in Tiles[y * columns + x].Data.Values)
{
if (!potentials.ContainsKey(c.id))
{
potentials.Add(c.id, c);
}
}
}
}
return(potentials);
}
private void BounceOffBottom(Object other)
{
if (this.Collision.Shape == CollisionBody.ShapeType.Circle)
{
CircleBody c = (CircleBody)this.Collision;
RectangleBody r = (RectangleBody)other.Collision;
float dist = (r.Position.Y + r.Size.Y) - (c.Position.Y - c.Radius);
this.Collision.Position.Y += dist * 2;
this.Velocity.Y *= -1;
}
else
{
RectangleBody r1 = (RectangleBody)this.Collision;
RectangleBody r2 = (RectangleBody)other.Collision;
float dist = (r2.Position.Y + r2.Size.Y) - (r1.Position.Y);
this.Collision.Position.Y += dist * 2;
this.Velocity.Y *= -1;
}
}
private void BounceOffLeft(Object other)
{
if (this.Collision.Shape == CollisionBody.ShapeType.Circle)
{
CircleBody c = (CircleBody)this.Collision;
RectangleBody r = (RectangleBody)other.Collision;
float dist = (c.Position.X + c.Radius) - (r.Position.X);
this.Collision.Position.X -= dist * 2;
this.Velocity.X *= -1;
}
else
{
RectangleBody r1 = (RectangleBody)this.Collision;
RectangleBody r2 = (RectangleBody)other.Collision;
float dist = (r1.Position.X + r1.Size.X) - (r2.Position.X);
this.Collision.Position.X -= dist * 2;
this.Velocity.X *= -1;
}
}
public Brick(Game1 game, CollisionBody collision, int health, int spriteNum, int crackedNum, PowerUpType powerUpType) : base(game, collision)
{
Game = game;
Collision = collision;
Collision.Parent = this;
Health = health;
//Texture = null;
//CrackedTexture = null;
//TextureColor = Color.White;
Velocity = new Vector2(0f);
Acceleration = new Vector2(0f);
this.SpriteNum = spriteNum;
this.CrackedSpriteNum = crackedNum;
if (powerUpType == PowerUpType.None)
{
Powerup = null;
}
else
{
CircleBody pCollision = new CircleBody(new Vector2(collision.Position.X + collision.Region().Width / 2, collision.Position.Y + collision.Region().Height / 2), Powerup.Size);
Powerup = new Powerup(game, pCollision, powerUpType);
}
}
private List <GridTile> GetCoveredTiles(CollisionBody toAdd)
{
int xMin = 0;
int xMax = 0;
int yMin = 0;
int yMax = 0;
if (toAdd.Shape == CollisionBody.ShapeType.Circle)
{
CircleBody body = (CircleBody)toAdd;
xMin = ((int)(Math.Max(body.Position.X - body.Radius / 2, 0)) / tileSize);
xMax = (int)(Math.Min(body.Position.X + body.Radius / 2, maxWidth - 1)) / tileSize;
yMin = ((int)(Math.Max(body.Position.Y - body.Radius / 2, 0)) / tileSize);
yMax = (int)(Math.Min(body.Position.Y + body.Radius / 2, maxHeight - 1)) / tileSize;
}
else if (toAdd.Shape == CollisionBody.ShapeType.Rectangle)
{
RectangleBody body = (RectangleBody)toAdd;
xMin = ((int)(Math.Max(body.Position.X, 0)) / tileSize);
xMax = (int)(Math.Min(body.Position.X + body.Size.X, maxWidth - 1)) / tileSize;
yMin = ((int)(Math.Max(body.Position.Y, 0)) / tileSize);
yMax = (int)(Math.Min(body.Position.Y + body.Size.Y, maxWidth - 1)) / tileSize;
}
List <GridTile> toReturn = new List <GridTile>();
for (int y = yMin; y <= yMax; y++)
{
for (int x = xMin; x <= xMax; x++)
{
toReturn.Add(Tiles[y * columns + x]);
}
}
return(toReturn);
}
public void BounceOff(Object other)
{
Vector2 velocityToCheck = this.Velocity - other.Velocity;
if (this.Collision.Shape == CollisionBody.ShapeType.Circle && other.Collision.Shape == CollisionBody.ShapeType.Circle)
{
// Circle on Circle
}
else if (this.Collision.Shape == CollisionBody.ShapeType.Circle && other.Collision.Shape == CollisionBody.ShapeType.Rectangle)
{
CircleBody c = (CircleBody)this.Collision;
RectangleBody r = (RectangleBody)other.Collision;
if (velocityToCheck.X >= 0)
{
// Moving right
if (velocityToCheck.Y >= 0)
{
// Moving right-down
if (r.Position.X - c.Position.X <= r.Position.Y - c.Position.Y)
{
this.BounceOffTop(other);
}
else
{
this.BounceOffLeft(other);
}
}
else
{
// Moving right-up
if (-1 * (r.Position.X - c.Position.X) <= (r.Position.Y + r.Size.Y - c.Position.Y))
{
this.BounceOffLeft(other);
}
else
{
this.BounceOffBottom(other);
}
}
}
else
{
// Moving left
if (velocityToCheck.Y >= 0)
{
// Moving left-down
if (r.Position.X + r.Size.X - c.Position.X <= -1 * (r.Position.Y - c.Position.Y))
{
this.BounceOffRight(other);
}
else
{
this.BounceOffTop(other);
}
}
else
{
// Moving left-up
if (r.Position.X + r.Size.X - c.Position.X <= r.Position.Y + r.Size.Y - c.Position.Y)
{
this.BounceOffRight(other);
}
else
{
this.BounceOffBottom(other);
}
}
}
}
}
