static public bool TryGetIntersection(this RectI2 item, RectI2 rect, out RectI2 intersection)
{
return(RectI2Extensions.TryCreateStrictMinMaxRectI2(
item.GetLeft().Max(rect.GetLeft()),
item.GetBottom().Max(rect.GetBottom()),
item.GetRight().Min(rect.GetRight()),
item.GetTop().Min(rect.GetTop()),
out intersection
));
}
static public IEnumerable <RectI2> GetSubtraction(this RectI2 item, RectI2 to_subtract)
{
if (item.TryGetIntersection(to_subtract, out to_subtract) == false)
{
yield return(item);
}
else
{
RectI2 left;
if (RectI2Extensions.TryCreateStrictMinMaxRectI2(
item.GetLeft(), to_subtract.GetBottom(),
to_subtract.GetLeft(), to_subtract.GetTop(),
out left
))
{
yield return(left);
}
RectI2 right;
if (RectI2Extensions.TryCreateStrictMinMaxRectI2(
to_subtract.GetRight(), to_subtract.GetBottom(),
item.GetRight(), to_subtract.GetTop(),
out right
))
{
yield return(right);
}
RectI2 bottom;
if (RectI2Extensions.TryCreateStrictMinMaxRectI2(
item.GetLeft(), item.GetBottom(),
item.GetRight(), to_subtract.GetBottom(),
out bottom
))
{
yield return(bottom);
}
RectI2 top;
if (RectI2Extensions.TryCreateStrictMinMaxRectI2(
item.GetLeft(), to_subtract.GetTop(),
item.GetRight(), item.GetTop(),
out top
))
{
yield return(top);
}
}
}
