/// <summary>
/// Makes a copy of the invoking DynamicShape's region,
/// and checks if it is intersecting with the given Shape's region,
/// with respect to the given Graphics object.
/// </summary>
/// <param name="shape">
/// Shape being compared against.
/// </param>
/// <param name="gr">
/// Screen graphics.
/// </param>
/// <returns>
/// True for a confirmed intersection,
/// false for an empty intersection.
/// </returns>
public bool IsIntersecting(Shape shape, Graphics gr)
{
// create a copy of the invoker based on its derived type
DynamicShape thisCopy = null;
if (this is Tank)
{
thisCopy = new Tank(this as Tank);
}
else if (this is Gunfire)
{
thisCopy = new Gunfire(this as Gunfire);
}
// tick the copy if not null
thisCopy?.Tick();
// get the copy's region
Region rCopy = new Region(thisCopy.GetPath());
// intersect the copy with the provided shape
rCopy.Intersect(shape.GetPath());
// if it's empty, not colliding
if (rCopy.IsEmpty(gr))
{
return(false);
}
// not empty, a collision has occured
return(true);
}
/// <summary>
/// Checks if the dynamic shape is out of bounds.
/// </summary>
/// <param name="level">The level to check bounds.</param>
/// <param name="gr">Screen graphics object.</param>
/// <returns>
/// True if the shape is out of bounds, and
/// false if the shape is within bounds.
/// </returns>
public bool IsOutOfBounds(Level level, Graphics gr)
{
// make a copy of the invoker, based on derived type
DynamicShape thisCopy = null;
if (this is Tank)
{
thisCopy = new Tank(this as Tank);
}
else if (this is Gunfire)
{
thisCopy = new Gunfire(this as Gunfire);
}
// tick the copy if not null
thisCopy?.Tick();
// get the level bounds
RectangleF bounds = level.GetPath().GetBounds();
// check if the copy is within 1 tilesize from the bounds
if (thisCopy.Position.X - Tilesize >= bounds.Left &&
thisCopy.Position.X + Tilesize < bounds.Right &&
thisCopy.Position.Y - Tilesize >= bounds.Top &&
thisCopy.Position.Y + Tilesize < bounds.Bottom)
{
return(false);
}
// copy is within a tilesize from the edge -- compare regions
// get the copy's region
Region rCopy = new Region(thisCopy.GetPath());
// exclude the copy from the level's graphics path outline
rCopy.Exclude(level.GetPath());
// if it's empty, not out of bounds
if (rCopy.IsEmpty(gr))
{
return(false);
}
// not empty, some of the copy is out of bounds
return(true);
}
