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));
}
public DrawObject[] TrimDrawObject(DrawObjectTrimingInfo trimingInfo)
{
if (trimingInfo.TrimedDrawObject is TDrawObject tDrawObject)
{
return(TrimDrawObject(tDrawObject, trimingInfo));
}
return(null);
}
protected override DrawObject[] TrimDrawObject(Rectangle drawObject, DrawObjectTrimingInfo drawObjectTrimingInfo)
{
return(null);
}
protected abstract DrawObject[] TrimDrawObject(TDrawObject drawObject, DrawObjectTrimingInfo trimingInfo);
