static IEnumerable <IntVector2> GetLineBoxEnclosingPoints(Box box, IBoundedLine leftLine, IBoundedLine rightLine)
{
return(from y in ListUtil.FromTo(box.Bottom, box.Top - 1)
let rightX = (int)rightLine.X(y)
from x in ListUtil.FromTo((int)leftLine.X(y), rightX)
select(new IntVector2(x, y)));
}
public LineBoxEnclosingPointsEnumerator(Box box, IBoundedLine leftLine, IBoundedLine rightLine)
{
this.box = box;
this.leftLine = leftLine;
this.rightLine = rightLine;
y = box.Bottom;
}
public static Maybe<DoubleVector2> IntersectBounded(IBoundedLine first, IBoundedLine second)
{
var unbounded = Intersect(first, second);
if (unbounded.IsNothing)
return unbounded;
var intersection = unbounded.FromJust;
if (!IsIntersectionWithinBounds(first, intersection) || !IsIntersectionWithinBounds(second, intersection))
return MaybeUtil.Nothing<DoubleVector2>();
return unbounded;
}
private static bool IsIntersectionWithinBounds(IBoundedLine second, DoubleVector2 intersection)
{
return (second.LeftX < intersection.X && intersection.X < second.RightX)
|| (second.BottomY < intersection.Y && intersection.Y < second.TopY);
}
