private void WriteArc(DxfDocument doc, Arc arc)
{
var radius = CADPoint.Distance(arc.center, arc.startPoint);
doc.AddEntity(new netDxf.Entities.Arc(new Vector2(arc.center.X, arc.center.Y),
radius, arc.startAngle, arc.endAngle));
}
internal override bool Cross(Bounding selectBound, Entity entity)
{
Arc arc = entity as Arc;
if (arc == null)
{
return(false);
}
Bounding arcBounding = arc.Bounding;
if (selectBound.Contains(arcBounding))
{
return(true);
}
if (!selectBound.IntersectWith(arcBounding))
{
return(false);
}
Circle circle = new Circle(arc.center, arc.radius);
CADPoint nearestPntOnBound = new CADPoint(
System.Math.Max(selectBound.left, System.Math.Min(circle.center.X, selectBound.right)),
System.Math.Max(selectBound.bottom, System.Math.Min(circle.center.Y, selectBound.top)));
if (CADPoint.Distance(nearestPntOnBound, circle.center) <= circle.radius)
{
double bdLeft = selectBound.left;
double bdRight = selectBound.right;
double bdTop = selectBound.top;
double bdBottom = selectBound.bottom;
List <CADPoint> pnts = new List <CADPoint>();
pnts.Add(new CADPoint(bdLeft, bdTop));
pnts.Add(new CADPoint(bdLeft, bdBottom));
pnts.Add(new CADPoint(bdRight, bdTop));
pnts.Add(new CADPoint(bdRight, bdBottom));
CADVector xp = new CADVector(1, 0);
foreach (CADPoint pnt in pnts)
{
if (CADPoint.Distance(pnt, circle.center) >= circle.radius)
{
CADVector v = pnt - circle.center;
double rad = CADVector.AngleInRadian(xp, v);
if (CADVector.Cross(xp, v) < 0)
{
rad = System.Math.PI * 2 - rad;
}
if (AngleInRange(rad, arc.startAngle, arc.endAngle))
{
return(true);
}
}
}
return(false);
}
else
{
return(false);
}
}