internal void SetArcMetrics(int legIndex, CircularLegMetrics metrics)
{
var edit = new CircularLegUpdate((uint)legIndex, metrics);
edit.Apply(m_Legs);
m_Changes.Add(edit);
}
/// <summary>
/// Creates a new <c>CircularLeg</c> with no spans.
/// </summary>
/// <param name="radius">The radius of the circular leg.</param>
/// <param name="clockwise">True if the curve is clockwise.</param>
/// <param name="span">The number of spans on the curve.</param>
internal CircularLeg(Distance radius, bool clockwise, int nspan)
: base(nspan)
{
m_Metrics = new CircularLegMetrics(radius, clockwise);
// The circle for this leg won't be known till we create a span.
m_Circle = null;
}
/// <summary>
/// Creates a new <c>CircularLeg</c> with no spans.
/// </summary>
/// <param name="radius">The radius of the circular leg.</param>
/// <param name="clockwise">True if the curve is clockwise.</param>
/// <param name="span">The number of spans on the curve.</param>
internal CircularLeg(Distance radius, bool clockwise, int nspan)
: base(nspan)
{
m_Metrics = new CircularLegMetrics(radius, clockwise);
// The circle for this leg won't be known till we create a span.
m_Circle = null;
}
internal void SetArcMetrics(int legIndex, CircularLegMetrics metrics)
{
var edit = new CircularLegUpdate((uint)legIndex, metrics);
edit.Apply(m_Legs);
m_Changes.Add(edit);
}
internal CircularLegUpdate(uint legIndex, CircularLegMetrics metrics)
: base(legIndex)
{
m_Metrics = metrics;
}
internal CircularLegUpdate(uint legIndex, CircularLegMetrics metrics)
: base(legIndex)
{
m_Metrics = metrics;
}
/// <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);
}
