/// <summary>Return the closest point on 'rect' to 'pt'</summary>
public static v2 ClosestPoint(BRect rect, v2 pt)
{
v2 lower = rect.Lower;
v2 upper = rect.Upper;
v2 closest;
if (rect.IsWithin(pt))
{
// if pt.x/pt.y > rect.sizeX/rect.sizeY then the point
// is closer to the Y edge of the rectangle
if (Math_.Abs(pt.x * rect.SizeY) > Math_.Abs(pt.y * rect.SizeX))
{
closest = new v2(pt.x, Math_.Sign(pt.y) * rect.SizeY);
}
else
{
closest = new v2(Math_.Sign(pt.x) * rect.SizeX, pt.y);
}
}
else
{
closest = new v2(
Math_.Clamp(pt.x, lower.x, upper.x),
Math_.Clamp(pt.y, lower.y, upper.y));
}
return(closest);
}
public static BBox operator *(m4x4 m, BBox rhs)
{
Debug.Assert(rhs.IsValid, "Transforming an invalid bounding box");
var bb = new BBox(m.pos, v4.Zero);
var mat = Math_.Transpose3x3(m);
bb.Centre.x += Math_.Dot(mat.x, rhs.Centre);
bb.Radius.x += Math_.Dot(Math_.Abs(mat.x), rhs.Radius);
bb.Centre.y += Math_.Dot(mat.y, rhs.Centre);
bb.Radius.y += Math_.Dot(Math_.Abs(mat.y), rhs.Radius);
bb.Centre.z += Math_.Dot(mat.z, rhs.Centre);
bb.Radius.z += Math_.Dot(Math_.Abs(mat.z), rhs.Radius);
return(bb);
}
public static BRect From(Rectangle r)
{
return(new BRect(v2.From(r.Location) + v2.From(r.Size) / 2f, Math_.Abs(v2.From(r.Size)) / 2f));
}
// Construct from
public static BBox From(v4 min, v4 max)
{
return(new BBox((max + min) * 0.5f, Math_.Abs(max - min) * 0.5f));
}