protected void SampleProbe(Vector2D point, out Probe probe)
{
point = Constrain(point - Vector2D.Half * _spacing);
Vector2D local = point - _region.TopLeft;
Vector2D coord = CgMath.Floor(local / _spacing);
int iY = (int)coord.Y * _stride;
int iX = (int)coord.X;
int iTopLeft = iY + iX;
int iTopRight = iY + Math.Min(iX + 1, _stride - 1);
int toBottom = (iTopLeft + _stride < _count) ? _stride : 0;
Vector2D pTopLeft = CellTopLeft(point);
Vector2D d = (point - pTopLeft) / _spacing;
probe.TopLeft = _data[iTopLeft];
probe.TopRight = _data[iTopRight];
probe.BottomLeft = _data[iTopLeft + toBottom];
probe.BottomRight = _data[iTopRight + toBottom];
probe.U = d.X;
probe.V = d.Y;
}
public Vector2D CellTopLeft(Vector2D point)
{
return(_spacing * CgMath.Floor(point * _toGrid));
}
public Vector2D CellCenter(Vector2D point)
{
return(_spacing * (CgMath.Floor(point * _toGrid) + Vector2D.Half));
}