private bool DoesLineCrossBoundery(IntPoint startPoint, IntPoint endPoint)
{
for (int bounderyIndex = 0; bounderyIndex < bounderyPolygons.Count; bounderyIndex++)
{
Polygon boundryPolygon = bounderyPolygons[bounderyIndex];
if (boundryPolygon.Count < 1)
{
continue;
}
IntPoint lastPosition = boundryPolygon[boundryPolygon.Count - 1];
for (int pointIndex = 0; pointIndex < boundryPolygon.Count; pointIndex++)
{
IntPoint currentPosition = boundryPolygon[pointIndex];
int startSide = startPoint.GetLineSide(lastPosition, currentPosition);
int endSide = endPoint.GetLineSide(lastPosition, currentPosition);
if (startSide != 0)
{
if (startSide + endSide == 0)
{
// each point is distinctly on a different side
return(true);
}
}
else
{
// if we terminate on the line that will count as crossing
return(true);
}
if (endSide == 0)
{
// if we terminate on the line that will count as crossing
return(true);
}
lastPosition = currentPosition;
}
}
return(false);
}
private bool DoesLineCrossBoundery(IntPoint startPoint, IntPoint endPoint)
{
for (int bounderyIndex = 0; bounderyIndex < bounderyPolygons.Count; bounderyIndex++)
{
Polygon boundryPolygon = bounderyPolygons[bounderyIndex];
if (boundryPolygon.Count < 1)
{
continue;
}
IntPoint lastPosition = boundryPolygon[boundryPolygon.Count - 1];
for (int pointIndex = 0; pointIndex < boundryPolygon.Count; pointIndex++)
{
IntPoint currentPosition = boundryPolygon[pointIndex];
int startSide = startPoint.GetLineSide(lastPosition, currentPosition);
int endSide = endPoint.GetLineSide(lastPosition, currentPosition);
if (startSide != 0)
{
if (startSide + endSide == 0)
{
// each point is distinctly on a different side
return true;
}
}
else
{
// if we terminate on the line that will count as crossing
return true;
}
if (endSide == 0)
{
// if we terminate on the line that will count as crossing
return true;
}
lastPosition = currentPosition;
}
}
return false;
}
