public override bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint)
{
if (rect == null)
{
throw new ArgumentNullException(nameof(rect));
}
if (Ellipse2D == null)
{
return(false);
}
//无论是否为任意选中,若包含了,则能够选中;
if (rect.Contains(Ellipse2D.Center) && rect.GetLines().All(p => p.Distance(Ellipse2D.Center) >= Ellipse2D.RadiusX))
{
return(true);
}
//若为任意点选中,矩形的四个顶点中,存在任意两点任意一点在椭圆内即可;
if (anyPoint && rect.GetLines().Any(p => {
var intersectPoints = Extension.IntersectWithLine(Ellipse2D, p);
return((intersectPoints?.Length ?? 0) != 0);
}))
{
return(rect.GetVertexes().Any(p => Ellipse2D.Contains(p)));
}
return(false);
}
protected override DrawObject[] TrimDrawObject(Line line, DrawObjectTrimingInfo trimingInfo)
{
Vector2D[] intersectPositions = trimingInfo.IntersectPositions;
Rectangle2D2 trimArea = trimingInfo.TrimArea;
if (line == null)
{
return(null);
}
if (intersectPositions == null)
{
return(null);
}
if (trimArea == null)
{
return(null);
}
//将交点集合筛选(需在线段上,不包括端点),并沿线段起始到终止方向进行排序;
intersectPositions = intersectPositions.
Where(p => p.IsInLine(line.Line2D)).
OrderBy(p => p.Distance(line.Line2D.Start)).
ToArray();
///得到矩形与线段的所有交点(最多两个)，通过该交点集合的与<param name="intersectPositions"/>的关系，进行裁剪;
var rectInserserctPositions = trimArea.GetLines().
Select(p => p.Intersect(line.Line2D)).
Where(p => p != null).
Distinct(Vector2DEqualityComparer.StaticInstance).
ToArray();
return(GetTrimedLineWithIntersectPositions(line, intersectPositions, rectInserserctPositions));
}
/// <summary>
/// 检查某个坐标是否处于某个矩形内部;
/// </summary>
/// <param name="rect"></param>
/// <param name="point"></param>
/// <returns></returns>
public static bool Contains(this Rectangle2D2 rect, Vector2D point)
{
if (rect == null)
{
throw new ArgumentNullException(nameof(rect));
}
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
return(point.IsInRegion(rect.GetLines().ToList()));
}
/// <summary>
/// 判断某个矩形与某个线段的包含或相交(当<paramref name="anyPoint"/>为真时)关系;
/// </summary>
/// <param name="line2D"></param>
/// <param name="rect"></param>
/// <param name="anyPoint"></param>
/// <returns></returns>
public static bool LineInRectangle(Line2D line2D, Rectangle2D2 rect, bool anyPoint)
{
if (line2D == null)
{
return(false);
}
//若在完全在矩形内部,则返回为真;
if (rect.Contains(line2D.Start) &&
rect.Contains(line2D.End))
{
return(true);
}
//若任意可选为真,则矩形任意一条边与之存在相交即可;
else if (anyPoint)
{
return(rect.GetLines()?.Any(p => p.Intersect(line2D) != null) ?? false);
}
return(false);
}