/// <summary>
/// Checks if the bounding box intersects with another bounding box.
/// </summary>
/// <param name="box">The bounding box to check for an intersection.</param>
/// <returns>True if an intersection occurs, false if not.</returns>
public bool Intersects(GenAABB box)
{
if ((box._maxX < _minX) || (box._minX > _maxX))
return false;
if ((box._maxY < _minY) || (box._minY > _maxY))
return false;
return true;
}
/// <summary>
/// Gets the positive or negative distances between the edges of two bounding boxes along the x-axis and y-axis.
/// </summary>
/// <param name="box">The bounding box to get the distance from.</param>
/// <returns>A <c>Vector2</c> containing the positive or negative distances between the edges of two bounding boxes along the x-axis and y-axis.</returns>
public Vector2 GetDistanceAABB(GenAABB box)
{
Vector2 distance = Vector2.Zero;
distance.X = Math.Abs(_midpointX - box.MidpointX) - (_halfWidth + box.HalfWidth);
distance.Y = Math.Abs(_midpointY - box.MidpointY) - (_halfHeight + box.HalfHeight);
return distance;
}
/// <summary>
/// Gets the x and y intersection depths of two bounding boxes.
/// </summary>
/// <param name="box">The bounding box to check against for an intersection.</param>
/// <returns>A <c>Vector2</c> containing the x and y intersection depths, or a zero vector if no intersection occurs.</returns>
public Vector2 GetIntersectDepthAABB(GenAABB box)
{
// Check for intersection along the x-axis first.
float distanceX = _midpointX - box.MidpointX;
float minDistanceX = _halfWidth + box.HalfWidth;
// If the horizontal distance between the midpoints is less than the sum of the widths, continue on the y-axis.
if (Math.Abs(distanceX) < minDistanceX)
{
float distanceY = _midpointY - box.MidpointY;
float minDistanceY = _halfHeight + box.HalfHeight;
// If the vertical distance between the midpoints is less than the sum of the heights, there is an intersection.
if (Math.Abs(distanceY) < minDistanceY)
{
Vector2 intersection = Vector2.Zero;
// Get the intersection depths.
intersection.X = (distanceX > 0) ? minDistanceX - distanceX : -minDistanceX - distanceX;
intersection.Y = (distanceY > 0) ? minDistanceY - distanceY : -minDistanceY - distanceY;
return intersection;
}
}
// Return a zero vector if there is no intersection.
return Vector2.Zero;
}
/// <summary>
/// Checks if the bounding box entirely contains another bounding box.
/// </summary>
/// <param name="box">The bounding box to check against.</param>
/// <returns>True if the bounding box is entirely contained, false if not.</returns>
public bool Contains(GenAABB box)
{
if ((box._minX <= _minX) || (box._maxX >= _maxX))
return false;
if ((box._minY <= _minY) || (box._maxY >= _maxY))
return false;
return true;
}
/// <summary>
/// A physical object that can be moved around in screen space.
/// </summary>
/// <param name="x">The x position of the top-left corner of the object.</param>
/// <param name="y">The y position of the top-left corner of the object.</param>
/// <param name="width">The width of the object.</param>
/// <param name="height">The height of the object.</param>
public GenObject(float x, float y, float width, float height)
{
_position = new Vector2(x, y);
_oldPosition = _position;
_hasMoved = false;
_bounds = new GenAABB(x, y, width, height);
_centerPosition = new Vector2(x + _bounds.HalfWidth, y + _bounds.HalfHeight);
_origin = new Vector2(_bounds.HalfWidth, _bounds.HalfHeight);
_originPosition = new Vector2(x + _origin.X, y + _origin.Y);
_boundingRect = new Rectangle(0, 0, (int)width, (int)height);
_rotation = 0f;
RotationSpeed = 0f;
_moveDistance = Vector2.Zero;
_moveBounds = new GenAABB(x, y, width, height);
Immovable = false;
Solid = true;
Mass = 1f;
Velocity = Vector2.Zero;
OldVelocity = Velocity;
Acceleration = Vector2.Zero;
Deceleration = Vector2.Zero;
MaxVelocity = Vector2.Zero;
_facing = Direction.None;
OldTouching = Direction.None;
Touching = Direction.None;
Parent = null;
ParentMode = ParentType.None;
ParentOffset = Vector2.Zero;
IsPlatform = false;
Platform = null;
OldPlatform = null;
Path = null;
PathNodeIndex = 0;
PathDirection = 1;
PathSpeed = 0f;
PathType = GenPath.Type.Clockwise;
PathAxis = GenMove.Axis.Both;
PathMovement = GenPath.Movement.Instant;
}
/// <summary>
/// A camera occupies a space on the game screen to draw game objects.
/// An error will occur if the camera is positioned outside of the game window.
/// </summary>
/// <param name="x">The x position of the camera.</param>
/// <param name="y">The y position of the camera.</param>
/// <param name="width">The width of the camera.</param>
/// <param name="height">The height of the camera.</param>
/// <param name="zoom">The scale at which to draw objects in the camera.</param>
public GenCamera(float x, float y, int width, int height, float zoom)
{
_cameraRect = new Rectangle(0, 0, width, height);
_cameraView = new GenAABB(0f, 0f, width, height);
_centerPosition = new Vector2(_cameraView.MidpointX, _cameraView.MidpointY);
_up = new Vector2(0f, -1f);
RenderTarget = new RenderTarget2D(GenG.GraphicsDevice, width, height);
PixelRenderTarget = new RenderTarget2D(GenG.GraphicsDevice, width, height);
_backgroundTexture = GenU.MakeTexture(Color.White, 1, 1);
Color = Color.White;
BgColor = Color.Transparent;
_scroll = Vector2.Zero;
_oldScroll = _scroll;
_velocity = Vector2.Zero;
_rotation = 0f;
Origin = new Vector2(width * 0.5f, height * 0.5f);
Scale = Vector2.One;
_drawPosition = new Vector2(x + Origin.X, y + Origin.Y);
_initialZoom = zoom;
Zoom = _initialZoom;
CameraFollowType = FollowType.LockOn;
_followTargets = new List<GenObject>();
FollowPosition = Vector2.Zero;
FollowLeading = new Vector2(50, 30);
_followStrength = 1f;
MinZoom = _initialZoom;
MaxZoom = 4f;
_shakeOffset = Vector2.Zero;
_shakeIntensity = 0f;
_shakeDecreasing = false;
_shakeTimer = new GenTimer(0f, null);
SpriteEffect = SpriteEffects.None;
_cameraEffect = new GenScreenEffect(_cameraRect);
Transform = Matrix.Identity;
// Set up the default camera blend state as alpha blend.
BlendState = new BlendState();
BlendState.ColorSourceBlend = Blend.One;
BlendState.ColorDestinationBlend = Blend.InverseSourceAlpha;
BlendState.ColorBlendFunction = BlendFunction.Add;
BlendState.AlphaSourceBlend = Blend.One;
BlendState.AlphaDestinationBlend = Blend.InverseSourceAlpha;
BlendState.AlphaBlendFunction = BlendFunction.Add;
}
/// <summary>
/// Gets the index of the leaf node that entirely contains the given bounding box.
/// </summary>
/// <param name="box">The bounding box used to search the leaf nodes.</param>
/// <returns>The index of the leaf node that entirely contains the given bounding box. Otherwise, -1 is returned.</returns>
internal int GetIndex(GenAABB box)
{
if (Contains(box))
{
if (box.Bottom < _midpointY)
{
if (box.Right < _midpointX) // Top-left leaf node.
return 0;
else if (box.Left > _midpointX) // Top-right leaf node.
return 1;
}
else if (box.Top > _midpointY)
{
if (box.Right < _midpointX) // Bottom-left leaf node.
return 2;
else if (box.Left > _midpointX) // Bottom-right leaf node.
return 3;
}
}
// Return -1 if the given bounding box does not fit within any leaf node.
return -1;
}
/// <summary>
/// A particle emitter that emits particles from a point,
/// </summary>
/// <param name="x">The x position of the top-left corner of the emitter.</param>
/// <param name="y">The y position of the top-left corner of the emitter.</param>
public GenEmitter(float x, float y)
{
_position = new Vector2(x, y);
_bounds = new GenAABB(x, y, 0f, 0f);
_boundingRect = Rectangle.Empty;
MinParticleSpeedX = -100;
MaxParticleSpeedX = 100;
MinParticleSpeedY = -100;
MaxParticleSpeedY = 100;
MinRotation = 0;
MaxRotation = 0;
MinRotationSpeed = 0;
MaxRotationSpeed = 0;
Colors = new List<Color>();
StartAlpha = 1f;
EndAlpha = 1f;
StartScale = 1f;
EndScale = 1f;
Explode = true;
EmitQuantity = 10;
_emitTimer = new GenTimer(0.1f, EmitParticles);
_emitTimer.IsLooping = true;
InheritVelocity = false;
Parent = null;
ParentOffset = Vector2.Zero;
}
