private void calcHeadTail(PointFP p1, PointFP p2, LineFP head, LineFP tail) {
LineFP curr = new LineFP(p1, p2);
head.reset(curr.getHeadOutline(ff_rad));
int dx = p2.x - p1.x;
int dy = p2.y - p1.y;
tail.reset(head.pt1.x + dx, head.pt1.y + dy, head.pt2.x + dx, head.pt2.y + dy);
}
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());
boolean cross1, cross2, needLineJoin = false;
PointFP pi1 = new PointFP();
PointFP pi2 = new PointFP();
cross1 =
LineFP.intersects(
new LineFP(head.pt1, tail.pt1), new LineFP(lastHead.pt1, lastTail.pt1), pi1);
cross2 =
LineFP.intersects(
new LineFP(head.pt2, tail.pt2), new LineFP(lastHead.pt2, lastTail.pt2), pi2);
if (cross1 && !cross2 && pi1.x != SingleFP.NaN) {
p1 = lastTail.pt2;
p2 = head.pt2;
needLineJoin = true;
} else if (!cross1 && cross2 && pi2.x != SingleFP.NaN) {
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);
}
}
}