private void CurveEnd(PointFP control1, PointFP control2, PointFP curveEnd)
{
drawingCurve = false;
if (needDrawStartCap)
{
startCapP1 = new PointFP(curveBegin);
startCapP2 = new PointFP(control1);
//AddLineCap(control1, curveBegin, startLineCap);
needDrawStartCap = false;
}
LineFP head = new LineFP();
LineFP tail = new LineFP();
CalcHeadTail(curveBegin, control1, head, new LineFP());
outline.AddMoveTo(head.P1);
outline.AddPath(curvePath1);
CalcHeadTail(control2, curveEnd, new LineFP(), tail);
outline.AddLineTo(tail.P1);
outline.AddLineTo(tail.P2);
outline.ExtendIfNeeded(curvePath1.cmdsSize, curvePath1.pntsSize);
int j = curvePath2.pntsSize - 1;
for (int i = curvePath2.cmdsSize - 1; i >= 0; i--)
{
outline.AddLineTo(curvePath2.pnts[j--]);
}
outline.AddLineTo(head.P2);
outline.AddClose();
curvePath1 = null;
curvePath2 = null;
lastCurveTail = null;
lastPoint = new PointFP(control2);
drawingCurve = false;
}
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.P1.X + dx, head.P1.Y + dy, head.P2.X + dx, head.P2.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());
bool cross1, cross2, needLineJoin = false;
PointFP pi1 = new PointFP();
PointFP pi2 = new PointFP();
cross1 = LineFP.Intersects(new LineFP(head.P1, tail.P1), new LineFP(lastHead.P1, lastTail.P1), pi1);
cross2 = LineFP.Intersects(new LineFP(head.P2, tail.P2), new LineFP(lastHead.P2, lastTail.P2), pi2);
if (cross1 && !cross2 && pi1.X != SingleFP.NaN)
{
p1 = lastTail.P2;
p2 = head.P2;
needLineJoin = true;
}
else if (!cross1 && cross2 && pi2.X != SingleFP.NaN)
{
p1 = lastTail.P1;
p2 = head.P1;
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);
}
}
}
public override void LineTo(PointFP point)
{
if (point.Equals(currPoint))
{
return;
}
LineFP head, tail;
CalcHeadTail(currPoint, point, head = new LineFP(), tail = new LineFP());
if (drawingCurve)
{
if (lastCurveTail != null)
{
curvePath1.AddLineTo(lastCurveTail.P1);
curvePath2.AddLineTo(lastCurveTail.P2);
}
lastCurveTail = new LineFP(tail);
}
else
{
if (needDrawStartCap)
{
//AddLineCap(point, currPoint, startLineCap);
startCapP1 = new PointFP(currPoint);
startCapP2 = new PointFP(point);
needDrawStartCap = false;
}
AddLineJoin(lastPoint, currPoint, point);
outline.AddMoveTo(head.P1);
outline.AddLineTo(tail.P1);
outline.AddLineTo(tail.P2);
outline.AddLineTo(head.P2);
outline.AddLineTo(head.P1);
outline.AddClose();
lastPoint = new PointFP(currPoint);
}
base.LineTo(point);
}
public void Reset(LineFP l)
{
Reset(l.P1, l.P2);
}
public LineFP(LineFP l)
{
Reset(l.P1, l.P2);
}
public static bool Intersects(LineFP l1, LineFP l2, PointFP intersection)
{
int x = SingleFP.NaN;
int y = SingleFP.NaN;
if (intersection != null)
{
intersection.Reset(x, y);
}
int ax0 = l1.P1.X;
int ax1 = l1.P2.X;
int ay0 = l1.P1.Y;
int ay1 = l1.P2.Y;
int bx0 = l2.P1.X;
int bx1 = l2.P2.X;
int by0 = l2.P1.Y;
int by1 = l2.P2.Y;
int adx = (ax1 - ax0);
int ady = (ay1 - ay0);
int bdx = (bx1 - bx0);
int bdy = (by1 - by0);
if (IsZero(adx) && IsZero(bdx))
{
return(IsEqual(ax0, bx0));
}
else if (IsZero(ady) && IsZero(bdy))
{
return(IsEqual(ay0, by0));
}
else if (IsZero(adx))
{
// A vertical
x = ax0;
y = IsZero(bdy)?by0:MathFP.Mul(MathFP.Div(bdy, bdx), x - bx0) + by0;
}
else if (IsZero(bdx))
{
// B vertical
x = bx0;
y = IsZero(ady)?ay0:MathFP.Mul(MathFP.Div(ady, adx), x - ax0) + ay0;
}
else if (IsZero(ady))
{
y = ay0;
x = MathFP.Mul(MathFP.Div(bdx, bdy), y - by0) + bx0;
}
else if (IsZero(bdy))
{
y = by0;
x = MathFP.Mul(MathFP.Div(adx, ady), y - ay0) + ax0;
}
else
{
int xma = MathFP.Div(ady, adx); // slope segment A
int xba = ay0 - (MathFP.Mul(ax0, xma)); // y intercept of segment A
int xmb = MathFP.Div(bdy, bdx); // slope segment B
int xbb = by0 - (MathFP.Mul(bx0, xmb)); // y intercept of segment B
// parallel lines?
if (xma == xmb)
{
// Need trig functions
return(xba == xbb);
}
else
{
// Calculate points of intersection
// At the intersection of line segment A and B, XA=XB=XINT and YA=YB=YINT
x = MathFP.Div((xbb - xba), (xma - xmb));
y = (MathFP.Mul(xma, x)) + xba;
}
}
// After the point or points of intersection are calculated, each
// solution must be checked to ensure that the point of intersection lies
// on line segment A and B.
int minxa = MathFP.Min(ax0, ax1);
int maxxa = MathFP.Max(ax0, ax1);
int minya = MathFP.Min(ay0, ay1);
int maxya = MathFP.Max(ay0, ay1);
int minxb = MathFP.Min(bx0, bx1);
int maxxb = MathFP.Max(bx0, bx1);
int minyb = MathFP.Min(by0, by1);
int maxyb = MathFP.Max(by0, by1);
if (intersection != null)
{
intersection.Reset(x, y);
}
return((x >= minxa) && (x <= maxxa) && (y >= minya) && (y <= maxya) && (x >= minxb) && (x <= maxxb) && (y >= minyb) && (y <= maxyb));
}
