public BoundsLineCrossing CrossLine(Point2 <double> point1, Point2 <double> point2)
{
BoundsLineCrossing crossing = new BoundsLineCrossing(point1, point2);
CohenSutherland2DClipper.Clip(crossing, this);
return(crossing);
}
public static void Clip(BoundsLineCrossing crossing, Bounds2 bounds)
{
int outCode0, outCode1;
Point2<double> P0 = crossing.P0;
Point2<double> P1 = crossing.P1;
while (true)
{
outCode0 = OutCodes (bounds, P0);
outCode1 = OutCodes (bounds, P1);
crossing.P0 = P0;
crossing.P1 = P1;
if (RejectCheck (outCode0, outCode1))
return;
if (AcceptCheck (outCode0, outCode1))
return;
if (outCode0 == 0)
{
double tempCoord; int tempCode;
tempCoord = P0.X; P0.X = P1.X; P1.X = tempCoord;
tempCoord = P0.Y; P0.Y = P1.Y; P1.Y = tempCoord;
tempCode = outCode0; outCode0 = outCode1; outCode1 = tempCode;
BoundsLineCrossingType tempType;
tempType = crossing.CrossingTypePoint0; crossing.CrossingTypePoint0 = crossing.CrossingTypePoint1; crossing.CrossingTypePoint1 = tempType;
}
if ((outCode0 & 1) != 0)
{
P0.X += (P1.X - P0.X) * (bounds.MaxY - P0.Y) / (P1.Y - P0.Y);
P0.Y = bounds.MaxY;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMaxY;
crossing.HasCrossed = true;
}
else
if ((outCode0 & 2) != 0)
{
P0.X += (P1.X - P0.X) * (bounds.MinY - P0.Y) / (P1.Y - P0.Y);
P0.Y = bounds.MinY;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMinY;
crossing.HasCrossed = true;
}
else
if ((outCode0 & 4) != 0)
{
P0.Y += (P1.Y - P0.Y) * (bounds.MaxX - P0.X) / (P1.X - P0.X);
P0.X = bounds.MaxX;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMaxX;
crossing.HasCrossed = true;
}
else
if ((outCode0 & 8) != 0)
{
P0.Y += (P1.Y - P0.Y) * (bounds.MinX - P0.X) / (P1.X - P0.X);
P0.X = bounds.MinX;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMinX;
crossing.HasCrossed = true;
}
}
}
public BoundsLineCrossing CrossLine(Point2<double> point1, Point2<double> point2)
{
BoundsLineCrossing crossing = new BoundsLineCrossing (point1, point2);
CohenSutherland2DClipper.Clip (crossing, this);
return crossing;
}
static public void Clip(BoundsLineCrossing crossing, Bounds2 bounds)
{
int outCode0, outCode1;
Point2 <double> P0 = crossing.P0;
Point2 <double> P1 = crossing.P1;
while (true)
{
outCode0 = OutCodes(bounds, P0);
outCode1 = OutCodes(bounds, P1);
crossing.P0 = P0;
crossing.P1 = P1;
if (RejectCheck(outCode0, outCode1))
{
return;
}
if (AcceptCheck(outCode0, outCode1))
{
return;
}
if (outCode0 == 0)
{
double tempCoord; int tempCode;
tempCoord = P0.X; P0.X = P1.X; P1.X = tempCoord;
tempCoord = P0.Y; P0.Y = P1.Y; P1.Y = tempCoord;
tempCode = outCode0; outCode0 = outCode1; outCode1 = tempCode;
BoundsLineCrossingType tempType;
tempType = crossing.CrossingTypePoint0; crossing.CrossingTypePoint0 = crossing.CrossingTypePoint1; crossing.CrossingTypePoint1 = tempType;
}
if ((outCode0 & 1) != 0)
{
P0.X += (P1.X - P0.X) * (bounds.MaxY - P0.Y) / (P1.Y - P0.Y);
P0.Y = bounds.MaxY;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMaxY;
crossing.HasCrossed = true;
}
else
if ((outCode0 & 2) != 0)
{
P0.X += (P1.X - P0.X) * (bounds.MinY - P0.Y) / (P1.Y - P0.Y);
P0.Y = bounds.MinY;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMinY;
crossing.HasCrossed = true;
}
else
if ((outCode0 & 4) != 0)
{
P0.Y += (P1.Y - P0.Y) * (bounds.MaxX - P0.X) / (P1.X - P0.X);
P0.X = bounds.MaxX;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMaxX;
crossing.HasCrossed = true;
}
else
if ((outCode0 & 8) != 0)
{
P0.Y += (P1.Y - P0.Y) * (bounds.MinX - P0.X) / (P1.X - P0.X);
P0.X = bounds.MinX;
crossing.CrossingTypePoint0 = BoundsLineCrossingType.CrossesMinX;
crossing.HasCrossed = true;
}
}
}
