/// <summary>
/// 外枠との交点を求める．
/// 複数の交点がある場合，line.Startに最も近い点を返す．
/// </summary>
public virtual Point GetIntersectionPoint(Line line)
{
/// 単純にBoundsの矩形との交点を求める
var lLine = _owner.LeftLine;
var tLine = _owner.TopLine;
var rLine = _owner.RightLine;
var bLine = _owner.BottomLine;
var pts = new List <Point>(4);
if (line.IntersectsWith(lLine))
{
pts.Add(line.GetIntersectionPoint(lLine));
}
if (line.IntersectsWith(tLine))
{
pts.Add(line.GetIntersectionPoint(tLine));
}
if (line.IntersectsWith(rLine))
{
pts.Add(line.GetIntersectionPoint(rLine));
}
if (line.IntersectsWith(bLine))
{
pts.Add(line.GetIntersectionPoint(bLine));
}
return(pts.Count == 0? Point.Empty: pts.FindMin(pt => (int)PointUtil.GetDistance(line.Start, pt)));
}
/// <summary>
/// 外枠との交点を求める．
/// 複数の交点がある場合，line.Startに最も近い点を返す．
/// </summary>
public virtual Point GetIntersectionPoint(Line line)
{
using (_owner._ResourceCache.UseResource()) {
var path = _owner._OutlinePathResouce;
var ipts = new List <Point>();
var pts = path.PathPoints;
for (int i = 0, len = pts.Length; i < len; ++i)
{
var pt1 = Point.Round(pts[i]);
var pt2 = Point.Round(i + 1 < len? pts[i + 1]: pts[0]);
if (pt1 != pt2)
{
var l = new Line(pt1, pt2);
if (line.IntersectsWith(l))
{
ipts.Add(line.GetIntersectionPoint(l));
}
}
}
return(ipts.Count == 0? Point.Empty: ipts.FindMin(pt => (int)PointUtil.GetDistance(line.Start, pt)));
}
}