/// <summary>
/// Returns whether or not this box intersects another.
/// </summary>
/// <param name="box2"></param>
/// <returns>True if the 2 boxes intersect, false otherwise.</returns>
public bool Intersects(AxisAlignedBox2 box2)
{
// Early-fail for nulls
if (this.IsNull || box2.IsNull)
{
return(false);
}
if (this.IsInfinite || box2.IsInfinite)
{
return(true);
}
// Use up to 6 separating planes
if (this.maxVector.X <= box2.minVector.X)
{
return(false);
}
if (this.maxVector.Y <= box2.minVector.Y)
{
return(false);
}
if (this.minVector.X >= box2.maxVector.X)
{
return(false);
}
if (this.minVector.Y >= box2.maxVector.Y)
{
return(false);
}
// otherwise, must be intersecting
return(true);
}
public Shape(AxisAlignedBox2 box)
{
this._axesDirty = true;
this._vertices = (Vector2[])box.Corners.Clone();
this._derivedVertices = (Vector2[])box.Corners.Clone();
this._axes = null;
}
public MinimumTranslationVector collideY(AxisAlignedBox2 box2)
{
var overlap = Intersection(box2);
if (!overlap.IsNull)
{
var axis = new Axis();
var minOverlap = 0.0;
var adjust = overlap.Size;
minOverlap = adjust.Y;
if (overlap.Center.Y > box2.Center.Y)
{
axis.edge = new Vector2(overlap.X0, overlap.Y0) - new Vector2(overlap.X1, overlap.Y0);
}
else
{
axis.edge = new Vector2(overlap.X1, overlap.Y1) - new Vector2(overlap.X0, overlap.Y1);
}
axis.unit = axis.edge.Perpendicular;
axis.normal = axis.unit.ToNormalized();
return(new MinimumTranslationVector(axis, minOverlap));
}
return(MinimumTranslationVector.Zero);
}
public AxisAlignedBox2(AxisAlignedBox2 box)
{
corners = new Vector2[4];
minVector = box.minVector;
maxVector = box.maxVector;
isNull = box.IsNull;
isInfinite = box.IsInfinite;
UpdateCorners();
}
public void update(AxisAlignedBox2 box)
{
if (_vertices.Length != 4)
{
throw new Exception("can't update with an aabb unless the shape has 4 verts");
}
_axesDirty = true;
for (var i = 0; i < _vertices.Length; i++)
{
_vertices[i] = box.Corners[i];
_derivedVertices[i] = box.Corners[i];
}
}
/// <summary>
/// Calculate the area of intersection of this box and another
/// </summary>
public AxisAlignedBox2 Intersection(AxisAlignedBox2 b2)
{
if (!Intersects(b2))
{
return(AxisAlignedBox2.Null);
}
Vector2 intMin = Vector2.Zero;
Vector2 intMax = Vector2.Zero;
Vector2 b2max = b2.maxVector;
Vector2 b2min = b2.minVector;
if (b2max.X > maxVector.X && maxVector.X > b2min.X)
{
intMax.X = maxVector.X;
}
else
{
intMax.X = b2max.X;
}
if (b2max.Y > maxVector.Y && maxVector.Y > b2min.Y)
{
intMax.Y = maxVector.Y;
}
else
{
intMax.Y = b2max.Y;
}
if (b2min.X < minVector.X && minVector.X < b2max.X)
{
intMin.X = minVector.X;
}
else
{
intMin.X = b2min.X;
}
if (b2min.Y < minVector.Y && minVector.Y < b2max.Y)
{
intMin.Y = minVector.Y;
}
else
{
intMin.Y = b2min.Y;
}
return(new AxisAlignedBox2(intMin, intMax));
}
public AxisAlignedBox2[] fromRectOffset(RectOffset offset)
{
var inner = new AxisAlignedBox2(minVector + offset.min, maxVector - offset.max);
var rects = new AxisAlignedBox2[9];
rects[0] = new AxisAlignedBox2(corners[0], inner.corners[0]);
rects[2] = new AxisAlignedBox2(Utility.Min(corners[1], inner.corners[1]), Utility.Max(corners[1], inner.corners[1]));
rects[6] = new AxisAlignedBox2(Utility.Min(corners[3], inner.corners[3]), Utility.Max(corners[3], inner.corners[3]));
rects[8] = new AxisAlignedBox2(inner.corners[2], corners[2]);
rects[1] = new AxisAlignedBox2(rects[0].corners[1], inner.corners[1]);
rects[3] = new AxisAlignedBox2(rects[0].corners[3], inner.corners[3]);
rects[4] = inner;
rects[5] = new AxisAlignedBox2(rects[2].corners[3], rects[8].corners[1]);
rects[7] = new AxisAlignedBox2(rects[6].corners[1], rects[8].corners[3]);
return(rects);
}
/// <summary>
/// Allows for merging two boxes together (combining).
/// </summary>
/// <param name="box">Source box.</param>
public void Merge(AxisAlignedBox2 box)
{
if (box.IsNull)
{
// nothing to merge with in this case, just return
return;
}
else if (box.IsInfinite)
{
this.IsInfinite = true;
}
else if (this.IsNull)
{
SetExtents(box.Minimum, box.Maximum);
}
else if (!this.IsInfinite)
{
if (box.minVector.X < minVector.X)
{
minVector.X = box.minVector.X;
}
if (box.maxVector.X > maxVector.X)
{
maxVector.X = box.maxVector.X;
}
if (box.minVector.Y < minVector.Y)
{
minVector.Y = box.minVector.Y;
}
if (box.maxVector.Y > maxVector.Y)
{
maxVector.Y = box.maxVector.Y;
}
UpdateCorners();
}
}
/// <summary>
/// Tests whether this ray intersects the given box.
/// </summary>
/// <param name="box"></param>
/// <returns>
/// Struct containing info on whether there was a hit, and the distance from the
/// origin of this ray where the intersect happened.
/// </returns>
public IntersectResult Intersects(AxisAlignedBox2 box)
{
return(Utility.Intersects(this, box));
}
/// <summary>
/// Returns whether or not this Circle interects a box.
/// </summary>
/// <param name="box"></param>
/// <returns>True if the box intersects, false otherwise.</returns>
public bool Intersects(AxisAlignedBox2 box)
{
return(Utility.Intersects(this, box));
}
public bool Contains(AxisAlignedBox2 box)
{
return(Contains(box.minVector) && Contains(box.maxVector));
}