private void EndPoints(JCVEdge e, PointF p, bool DirectionIsRight)
{
int index = (DirectionIsRight) ? 1 : 0;
e.Points[index] = p;
if (!e.isValid(1 - index))
{
return;
}
FinishLine(e);
}
public override bool ClipEdge(JCVEdge edge)
{
float pxMin = boundingBox.X;
float pxMax = boundingBox.Right;
float pyMin = boundingBox.Y;
float pyMax = boundingBox.Bottom;
float x1, y1, x2, y2;
PointF s1, s2;
bool s1Null, s2Null;
s1Null = s2Null = false;
if (edge.A == 1 && edge.B >= 0)
{
if (edge.isValid(1))
{
s1 = edge.Points[1];
}
else
{
s1Null = true;
}
if (edge.isValid(0))
{
s2 = edge.Points[0];
}
else
{
s2Null = true;
}
}
else
{
if (edge.isValid(0))
{
s1 = edge.Points[0];
}
else
{
s1Null = true;
}
if (edge.isValid(1))
{
s2 = edge.Points[1];
}
else
{
s2Null = true;
}
}
if (edge.A == 1) //delta x is larger
{
y1 = pyMin;
if (!s1Null && (s1.Y > pyMin))
{
y1 = s1.Y;
}
if (y1 > pyMax)
{
y1 = pyMax;
}
x1 = edge.C - edge.B * y1;
y2 = pyMax;
if (!s2Null && (s2.Y < pyMax))
{
y2 = s2.Y;
}
if (y2 < pyMin)
{
y2 = pyMin;
}
x2 = edge.C - edge.B * y2;
// JCash note: condition never occurs according to lcov
//if ((x1 > pxMax && x2 > pxMax) || (x1 < pxMin && x2 < pxMin))
//{
// return false;
//}
if (x1 > pxMax)
{
x1 = pxMax;
y1 = (edge.C - x1) / edge.B;
}
else if (x1 < pxMin)
{
x1 = pxMin;
y1 = (edge.C - x1) / edge.B;
}
if (x2 > pxMax)
{
x2 = pxMax;
y2 = (edge.C - x2) / edge.B;
}
else if (x2 < pxMin)
{
x2 = pxMin;
y2 = (edge.C - x2) / edge.B;
}
}
else //delta y is larger
{
x1 = pxMin;
if (!s1Null && (s1.X > pxMin))
{
x1 = s1.X;
}
if (x1 > pxMax)
{
x1 = pxMax;
}
y1 = edge.C - edge.A * x1;
x2 = pxMax;
if (!s2Null && (s2.X < pxMax))
{
x2 = s2.X;
}
if (x2 < pxMin)
{
x2 = pxMin;
}
y2 = edge.C - edge.A * x2;
// JCash note: condition never occurs according to lcov
//if ((y1 > pyMax && y2 > pyMax) || (y1 < pyMin && y2 < pyMin))
//{
// return false;
//}
if (y1 > pyMax)
{
y1 = pyMax;
x1 = (edge.C - y1) / edge.A;
}
else if (y1 < pyMin)
{
y1 = pyMin;
x1 = (edge.C - y1) / edge.A;
}
if (y2 > pyMax)
{
y2 = pyMax;
x2 = (edge.C - y2) / edge.A;
}
else if (y2 < pyMin)
{
y2 = pyMin;
x2 = (edge.C - y2) / edge.A;
}
}
edge.Points[0].X = x1;
edge.Points[0].Y = y1;
edge.Points[1].X = x2;
edge.Points[1].Y = y2;
return(!(x1 == x2 && y1 == y2)); //if points are same, invalid line
}