/// <summary>
/// Sets flag bit(s)
/// </summary>
/// <param name="flag">The flag bit(s) to set</param>
/// <param name="setting">True to set, false to clear</param>
void SetFlag(LegItemFlag flag, bool setting)
{
if (setting)
{
m_Switches |= flag;
}
else
{
m_Switches &= (~flag);
}
}
/// <summary>
/// Sets the distance of a specific span in this face.
/// </summary>
/// <param name="distance">The distance to assign.</param>
/// <param name="index">The index of the distance [0,NumSpan-1]</param>
/// <param name="qualifier"></param>
/// <returns>True if index was valid.</returns>
internal bool SetDistance(Distance distance, int index, LegItemFlag qualifier)
{
// Return if index is out of range.
if (index < 0 || index >= NumSpan)
{
return(false);
}
// Remember any qualifier.
if (qualifier != 0)
{
m_Spans[index].Flags |= qualifier;
}
// Assign the distance
m_Spans[index].ObservedDistance = distance;
return(true);
}
/// <summary>
/// Sets the distance of a specific span in this face.
/// </summary>
/// <param name="distance">The distance to assign.</param>
/// <param name="index">The index of the distance [0,NumSpan-1]</param>
/// <param name="qualifier"></param>
/// <returns>True if index was valid.</returns>
internal bool SetDistance(Distance distance, int index, LegItemFlag qualifier)
{
// Return if index is out of range.
if (index < 0 || index >= NumSpan)
return false;
// Remember any qualifier.
if (qualifier != 0)
m_Spans[index].Flags |= qualifier;
// Assign the distance
m_Spans[index].ObservedDistance = distance;
return true;
}
/// <summary>
/// Creates a straight leg.
/// </summary>
/// <param name="items">Array of path items.</param>
/// <param name="si">Index to the item where the leg data starts.</param>
/// <param name="nexti">Index of the item where the next leg starts.</param>
/// <returns>The new leg.</returns>
static StraightLeg CreateStraightLeg(PathItem[] items, int si, out int nexti)
{
// Get the leg ID.
int legnum = items[si].LegNumber;
// How many distances have we got?
int ndist = 0;
for (nexti = si; nexti < items.Length && items[nexti].LegNumber == legnum; nexti++)
{
if (items[nexti].IsDistance)
{
ndist++;
}
}
// Create the leg.
StraightLeg leg = new StraightLeg(ndist);
// Assign each distance.
ndist = 0;
for (int i = si; i < nexti; i++)
{
Distance d = items[i].GetDistance();
if (d != null)
{
// See if there is a qualifier after the distance
LegItemFlag qual = LegItemFlag.Null;
if ((i + 1) < nexti)
{
PathItemType nexttype = items[i + 1].ItemType;
if (nexttype == PathItemType.MissConnect)
{
qual = LegItemFlag.MissConnect;
}
if (nexttype == PathItemType.OmitPoint)
{
qual = LegItemFlag.OmitPoint;
}
}
leg.PrimaryFace.SetDistance(d, ndist, qual);
ndist++;
}
}
// If the first item is an angle, remember it as part of the leg.
if (items[si].ItemType == PathItemType.Angle)
{
leg.StartAngle = items[si].Value;
}
else if (items[si].ItemType == PathItemType.Deflection)
{
leg.SetDeflection(items[si].Value);
}
// Return a reference to the new leg
return(leg);
}
/// <summary>
/// Creates a circular leg.
/// </summary>
/// <param name="items">Array of path items.</param>
/// <param name="si">Index to the item where the leg data starts.</param>
/// <param name="nexti">Index of the item where the next leg starts.</param>
/// <returns>The new leg.</returns>
static CircularLeg CreateCircularLeg(PathItem[] items, int si, out int nexti)
{
// Confirm that the first item refers to the BC.
if (items[si].ItemType != PathItemType.BC)
{
throw new Exception("PathParser.CreateCircularLeg - Not starting at BC");
}
// The BC has to be followed by at least 3 items: angle, radius
// and EC (add an extra 1 to account for 0-based indexing).
if (items.Length < si + 4)
{
throw new Exception("PathParser.CreateCircularLeg - Insufficient curve data");
}
double bangle = 0.0; // Angle at BC
double cangle = 0.0; // Central angle
double eangle = 0.0; // Angle at EC
bool twoangles = false; // True if bangle & eangle are both defined.
bool clockwise = true; // True if curve is clockwise
int irad = 0; // Index of the radius item
bool cul = false; // True if cul-de-sac case
// Point to item following the BC.
nexti = si + 1;
PathItemType type = items[nexti].ItemType;
// If the angle following the BC is a central angle
if (type == PathItemType.CentralAngle)
{
// We have a cul-de-sac
cul = true;
// Get the central angle.
cangle = items[nexti].Value;
nexti++;
}
else if (type == PathItemType.BcAngle)
{
// Get the entry angle.
bangle = items[nexti].Value;
nexti++;
// Does an exit angle follow?
if (items[nexti].ItemType == PathItemType.EcAngle)
{
eangle = items[nexti].Value;
twoangles = true;
nexti++;
}
}
else
{
// The field after the BC HAS to be an angle.
throw new ApplicationException("Angle does not follow BC");
}
// Must be followed by radius.
if (items[nexti].ItemType != PathItemType.Radius)
{
throw new ApplicationException("Radius does not follow angle");
}
// Get the radius
Distance radius = items[nexti].GetDistance();
irad = nexti;
nexti++;
// The item after the radius indicates whether the curve is counterclockwise.
if (items[nexti].ItemType == PathItemType.CounterClockwise)
{
nexti++;
clockwise = false;
}
// Get the leg ID.
int legnum = items[si].LegNumber;
// How many distances have we got?
int ndist = 0;
for (; nexti < items.Length && items[nexti].LegNumber == legnum; nexti++)
{
if (items[nexti].IsDistance)
{
ndist++;
}
}
// Create the leg.
CircularLeg leg = new CircularLeg(radius, clockwise, ndist);
CircularLegMetrics metrics = leg.Metrics;
// Set the entry angle or the central angle, depending on what we have.
if (cul)
{
metrics.SetCentralAngle(cangle);
}
else
{
metrics.SetEntryAngle(bangle);
}
// Assign second angle if we have one.
if (twoangles)
{
metrics.SetExitAngle(eangle);
}
// Assign each distance, starting one after the radius.
ndist = 0;
for (int i = irad + 1; i < nexti; i++)
{
Distance dist = items[i].GetDistance();
if (dist != null)
{
// See if there is a qualifier after the distance
LegItemFlag qual = LegItemFlag.Null;
if (i + 1 < nexti)
{
PathItemType nexttype = items[i + 1].ItemType;
if (nexttype == PathItemType.MissConnect)
{
qual = LegItemFlag.MissConnect;
}
if (nexttype == PathItemType.OmitPoint)
{
qual = LegItemFlag.OmitPoint;
}
}
leg.PrimaryFace.SetDistance(dist, ndist, qual);
ndist++;
}
}
// Return the new leg.
return(leg);
}
/// <summary>
/// Creates new <c>SpanInfo</c> with everything set to null.
/// </summary>
internal SpanInfo()
{
m_Distance = null;
m_Feature = null;
m_Switches = LegItemFlag.Null;
}
