void DebugDrawCellDetails(int x, int y, int cellCount, float secondsToDisplay = 0.5f, float textScale = 1f)
{
ECDebug.DrawHollowRect(new Rectangle(x * _cellSize, y * _cellSize, _cellSize, _cellSize), Color.Red,
secondsToDisplay);
if (cellCount > 0)
{
var textPosition = new Vector2((float)x * (float)_cellSize + 0.5f * _cellSize,
(float)y * (float)_cellSize + 0.5f * _cellSize);
ECDebug.DrawText(Graphics.Instance.DevFont, cellCount.ToString(), textPosition, Color.DarkGreen,
secondsToDisplay, textScale);
}
}
public static bool IntersectMovingCircleBox(Circle s, Box b, Vector2 movement, out float time)
{
// compute the AABB resulting from expanding b by sphere radius r
var e = b.bounds;
e.Inflate(s.Radius, s.Radius);
// Intersect ray against expanded expanded Rectangle e. Exit with no intersection if ray
// misses e, else get intersection point p and time t as result
var ray = new Ray2D(s.position - movement, s.position);
if (!e.RayIntersects(ref ray, out time) && time > 1.0f)
{
return(false);
}
// get the intersection point
var point = ray.Start + ray.Direction * time;
// compute which min and max faces of b the intersection point p lies outside of. Note, u and v cannot have the
// same bits set and they must have at least one bit set among them.
int u = 0, v = 0;
if (point.X < b.bounds.Left)
{
u |= 1;
}
if (point.X > b.bounds.Right)
{
v |= 1;
}
if (point.Y < b.bounds.Top)
{
u |= 2;
}
if (point.Y > b.bounds.Bottom)
{
v |= 2;
}
// 'or' all set bits together into a bitmask (note u + v == u | v)
var m = u + v;
// if all 3 bits are set then point is in a vertex region
if (m == 3)
{
// must now intersect segment against the capsules of the two edges meeting at the vert and return the best time,
// if one or more hit
// https://play.google.com/books/reader?printsec=frontcover&output=reader&id=VSoIBwAAAEAJ&pg=GBS.PA267
// https://github.com/noonat/hello/blob/580b986f3bb27b93645087441d2744eeb99d6d35/hello/collisions/Collision.hx#L675
//throw new NotImplementedException();
Debug.Log("m == 3. corner {0}", Time.FrameCount);
}
// if only one bit is set in m then point is in a face region
if ((m & (m - 1)) == 0)
{
ECDebug.DrawHollowBox(point, 4, Color.Black, 0.4f);
// do nothing. time from the expanded rect intersection is the correct time
return(true);
}
// point is on an edge region. intersect against the capsule at the edge.
return(true);
}
