private void AddLineJoin(PointFP lastPoint, PointFP currPoint,
PointFP nextPoint)
{
if (lastPoint == null || currPoint == null || nextPoint == null ||
nextPoint.Equals(currPoint) || lastPoint.Equals(currPoint))
{
return;
}
PointFP p1 = null, p2 = null;
LineFP head, tail, lastHead, lastTail;
CalcHeadTail(currPoint, nextPoint,
head = new LineFP(), tail = new LineFP());
CalcHeadTail(lastPoint, currPoint,
lastHead = new LineFP(), lastTail = new LineFP());
var needLineJoin = false;
var pi1 = new PointFP();
var pi2 = new PointFP();
var cross1 = LineFP.Intersects(new LineFP(head.Pt1, tail.Pt1),
new LineFP(lastHead.Pt1, lastTail.Pt1), pi1);
var cross2 = LineFP.Intersects(new LineFP(head.Pt2, tail.Pt2),
new LineFP(lastHead.Pt2, lastTail.Pt2), pi2);
if (cross1 && !cross2 && pi1.X != SingleFP.NOT_A_NUMBER)
{
p1 = lastTail.Pt2;
p2 = head.Pt2;
needLineJoin = true;
}
else if (!cross1 && cross2 && pi2.X != SingleFP.NOT_A_NUMBER)
{
p1 = lastTail.Pt1;
p2 = head.Pt1;
needLineJoin = true;
}
if (needLineJoin)
{
_outline.AddMoveTo(cross1 ? pi1 : pi2);
_outline.AddLineTo(cross1 ? p2 : p1);
if (_lineJoin == PenFP.LINEJOIN_MITER)
{
_outline.AddLineTo(cross1 ? pi2 : pi1);
}
_outline.AddLineTo(cross1 ? p1 : p2);
_outline.AddClose();
if (_lineJoin == PenFP.LINEJOIN_ROUND)
{
AddLineCap(cross2 ? pi2 : pi1, currPoint, PenFP.LINECAP_ROUND);
}
}
}
