INT32 GBlend::BezierLength( POINT P0, POINT P1, POINT P2, POINT P3 )
{
UINT32 dx,dy ;
dx = abs(P1.x*3 - P0.x*2 - P3.x) ;
dy = abs(P1.y*3 - P0.y*2 - P3.y) ;
if ( (dx>=dy ? 3*dx+dy : dx+3*dy) > Flatness )
return FlattenSplit(P0,P1,P2,P3) ;
dx = abs(P2.x*3 - P0.x - P3.x*2) ;
dy = abs(P2.y*3 - P0.y - P3.y*2) ;
if ( (dx>=dy ? 3*dx+dy : dx+3*dy) > Flatness )
return FlattenSplit(P0,P1,P2,P3) ;
return length(P0,P3) ;
}
void FlattenCurve( POINT P0, POINT P1, POINT P2, POINT P3 )
{
UINT32 dx,dy ;
dx = abs(P1.x*3 - P0.x*2 - P3.x) ;
dy = abs(P1.y*3 - P0.y*2 - P3.y) ;
if ( (dx>=dy ? 3*dx+dy : dx+3*dy) > Flatness )
FlattenSplit(P0,P1,P2,P3) ;
else
{
dx = abs(P2.x*3 - P0.x - P3.x*2) ;
dy = abs(P2.y*3 - P0.y - P3.y*2) ;
if ( (dx>=dy ? 3*dx+dy : dx+3*dy) > Flatness )
FlattenSplit(P0,P1,P2,P3) ;
else
DoLine(P3) ;
}
}
BOOL ProcessPath::FlattenCurve( INT32 Px0,INT32 Py0,
INT32 Px1,INT32 Py1,
INT32 Px2,INT32 Py2,
INT32 Px3,INT32 Py3, BOOL QuantiseAll)
{
INT32 diff;
INT32 dx0 = (Px1*3 - Px0*2 - Px3);
if (dx0 < 0) dx0 = -dx0;
//dx0 = dx0 < 0 ? -dx0 : dx0;
INT32 dy0 = (Py1*3 - Py0*2 - Py3);
if (dy0 < 0) dy0 = -dy0;
//dy0 = dy0 < 0 ? -dy0 : dy0;
// Get the line's distance from the curve
if (dx0 >= dy0)
diff = 3*dx0 + dy0;
else
diff = dx0 + 3*dy0;
// Is the straight line close enough to the curve ?
if (diff > ProcFlatness)
{
// Not close enough so split it into two and recurse for each half
BOOL ok = FlattenSplit(Px0,Py0, Px1,Py1, Px2,Py2, Px3,Py3, QuantiseAll);
return ok;
}
INT32 dx1 = (Px2*3 - Px0 - Px3*2);
if (dx1 < 0) dx1 = -dx1;
//dx1 = dx1 < 0 ? -dx1 : dx1;
INT32 dy1 = (Py2*3 - Py0 - Py3*2);
if (dy1 < 0) dy1 = -dy1;
//1 = dy1 < 0 ? -dy1 : dy1;
// Get the line's distance from the curve
if (dx1 >= dy1)
diff = 3*dx1 + dy1;
else
diff = dx1 + 3*dy1;
// Is the straight line close enough to the curve ?
if (diff > ProcFlatness)
{
// Not close enough so split it into two and recurse for each half
BOOL ok = FlattenSplit(Px0,Py0, Px1,Py1, Px2,Py2, Px3,Py3, QuantiseAll);
return ok;
}
DocCoord npoint;
npoint.x = Px3;
npoint.y = Py3;
// Line is now close enough so call the virtual function
if (!QuantiseAll)
return NewPoint(PT_LINETO, &npoint);
else
{
DocCoord spoint;
spoint.x = Px0;
spoint.y = Py0;
return InsertQuantisedLineTo(&npoint,&spoint);
}
}
