private float MoveY(List <RectangleCol> objs)
{
float _normal = 0;
float _minY = float.NegativeInfinity;
float _maxY = float.PositiveInfinity;
RectangleCol _closestMinObj = null;
RectangleCol _closestMaxObj = null;
// Investigates all objects to find max and min.
foreach (RectangleCol obj in objs)
{
if (obj == this)
{
continue; // Don't check for collision with self
}
if (right <= obj.position.X || position.X >= obj.right)
{
continue;
}
if (velocity.Y > 0 && obj.position.Y < _maxY && obj.position.Y >= bottom)
{
_maxY = obj.position.Y;
_closestMaxObj = obj;
}
else if (velocity.Y < 0 && obj.bottom <= position.Y && obj.bottom > _minY)
{
_minY = obj.bottom;
_closestMinObj = obj;
}
}
// Updates the objects position accordingly.
if (velocity.Y > 0 && bottom + velocity.Y > _maxY)
{
_normal = _maxY - (bottom + velocity.Y);
this.velocity.Y = 0;
this.position.Y = _maxY - size.Y;
this.CollideWith(_closestMaxObj);
}
else if (velocity.Y < 0 && position.Y + velocity.Y < _minY)
{
_normal = _minY - (position.Y + velocity.Y);
this.velocity.Y = 0;
this.position.Y = _minY;
this.CollideWith(_closestMinObj);
}
else
{
this.position.Y += velocity.Y;
}
return(_normal);
}
public virtual void CollideWith(RectangleCol obj)
{
}
private float MoveX(List <RectangleCol> objs)
{
float _normal = 0;
// Calculate the minimum and maximum values for x and y.
float _minX = float.NegativeInfinity;
float _maxX = float.PositiveInfinity;
// Sets the closest object collided with to null
RectangleCol _closestMinObj = null;
RectangleCol _closestMaxObj = null;
// Checks each object in the room and finds which objects restrict X.
foreach (RectangleCol obj in objs)
{
if (obj == this)
{
continue; // Don't check for collision with self
}
// Finds only the objects at the same Y level as this one.
if (this.bottom <= obj.position.Y || this.position.Y >= obj.bottom)
{
continue;
}
// Checks if the object if to the left, and if it is closer than the current minimum X.
if (velocity.X < 0 && obj.right > _minX && obj.right <= position.X)
{
// Sets this object as the closest from the left.
_minX = obj.right;
_closestMinObj = obj;
}
// Checks if the object is to the right, and if it is closer than the current maximum X.
else if (velocity.X > 0 && obj.position.X < _maxX && obj.position.X >= right)
{
// Sets this object as the closest from the right.
_maxX = obj.position.X;
_closestMaxObj = obj;
}
}
// Checks if after moving the maximum X is violated.
if (velocity.X > 0 && this.right + this.velocity.X > _maxX)
{
_normal = _maxX - (this.right + this.velocity.X);
this.velocity.X = 0;
this.position.X = _maxX - this.size.X;
// Calls the CollideWith method.
if (_closestMaxObj != null)
{
this.CollideWith(_closestMaxObj);
}
}
// Checks if after moving the minimum X is violated.
else if (velocity.X < 0 && this.position.X + this.velocity.X < _minX)
{
_normal = _minX - this.position.X - this.velocity.X;
this.position.X = _minX;
this.velocity.X = 0;
if (_closestMinObj != null)
{
this.CollideWith(_closestMinObj);
}
}
else // If all is well, it moves the object.
{
this.position.X += this.velocity.X;
}
return(_normal);
}
public virtual void CollideWith(RectangleCol obj)
{
}