public bool ClipLine(ref Vector2 lineStart, ref Vector2 lineEnd)
{
Vector2 P = lineEnd - lineStart;
float tMinimum = 0, tMaximum = 1;
ClippingHandler pqClip = delegate(float directedProjection,
float directedDistance)
{
if (directedProjection == 0)
{
if (directedDistance < 0)
{
return(false);
}
}
else
{
float amount = directedDistance / directedProjection;
if (directedProjection < 0)
{
if (amount > tMaximum)
{
return(false);
}
else if (amount > tMinimum)
{
tMinimum = amount;
}
}
else
{
if (amount < tMinimum)
{
return(false);
}
else if (amount < tMaximum)
{
tMaximum = amount;
}
}
}
return(true);
};
if (pqClip(-P.X, lineStart.X - _clipMin.X))
{
if (pqClip(P.X, _clipMax.X - lineStart.X))
{
if (pqClip(-P.Y, lineStart.Y - _clipMin.Y))
{
if (pqClip(P.Y, _clipMax.Y - lineStart.Y))
{
if (tMaximum < 1)
{
lineEnd.X = lineStart.X + tMaximum * P.X;
lineEnd.Y = lineStart.Y + tMaximum * P.Y;
}
if (tMinimum > 0)
{
lineStart.X += tMinimum * P.X;
lineStart.Y += tMinimum * P.Y;
}
return(true);
}
}
}
}
return(false);
}
public bool ClipLine(ref Line line)
{
Point P = line.End - (Size)line.Start;
float tMinimum = 0, tMaximum = 1;
ClippingHandler pqClip = delegate(float directedProjection,
float directedDistance)
{
if (directedProjection == 0)
{
if (directedDistance < 0)
{
return(false);
}
}
else
{
float amount = directedDistance / directedProjection;
if (directedProjection < 0)
{
if (amount > tMaximum)
{
return(false);
}
else if (amount > tMinimum)
{
tMinimum = amount;
}
}
else
{
if (amount < tMinimum)
{
return(false);
}
else if (amount < tMaximum)
{
tMaximum = amount;
}
}
}
return(true);
};
if (pqClip(-P.X, line.Start.X - _clipMin.X))
{
if (pqClip(P.X, _clipMax.X - line.Start.X))
{
if (pqClip(-P.Y, line.Start.Y - _clipMin.Y))
{
if (pqClip(P.Y, _clipMax.Y - line.Start.Y))
{
if (tMaximum < 1)
{
line.End.X = (int)(line.Start.X + tMaximum * P.X);
line.End.Y = (int)(line.Start.Y + tMaximum * P.Y);
}
if (tMinimum > 0)
{
line.Start.X = (int)(line.Start.X + tMinimum * P.X);
line.Start.Y = (int)(line.Start.Y + tMinimum * P.Y);
}
return(true);
}
}
}
}
return(false);
}
