/// <summary>
/// Construct bezier curve from data points
/// </summary>
/// <param name="data">In: Data points</param>
/// <param name="fitError">In: tolerated error</param>
/// <returns>Whether bezier construction is possible</returns>
private bool ConstructFromData(CuspData data, double fitError)
{
// Check for empty stroke
if (data.Count < 2)
{
return(false);
}
// Add the first point
AddBezierPoint(data.XY(0));
// Special cases - 2 or 3 points
if (data.Count == 3)
{
AddParabola(data, 0);
return(true);
}
else if (data.Count == 2)
{
AddLine(data, 0, 1);
return(true);
}
// For default case error passed in will be 0.
// 3% is the default value
if (DoubleUtil.DBL_EPSILON > fitError)
{
fitError = 0.03f * (data.Distance() * StrokeCollectionSerializer.HimetricToAvalonMultiplier);
}
data.SetTanLinks(0.5f * fitError);
// otherwise use the value specified in the drawing attribute
// get (error)^2
fitError *= (fitError);
bool done = false;
int to = 0;
int next_cusp = 0;
int prev_cusp = 0;
bool is_a_cusp = true;
Vector tanEnd = new Vector(0, 0);
Vector tanStart = new Vector(0, 0);
for (int from = 0; !done; from = to)
{
if (is_a_cusp)
{
prev_cusp = next_cusp;
next_cusp = data.GetNextCusp(from);
if (!data.Tangent(ref tanStart, from, prev_cusp, next_cusp, false, true))
{
return(false);
}
}
else
{
tanStart.X = -tanEnd.X;
tanStart.Y = -tanEnd.Y;
}
to = from + 3;
// No meat in this loop, just extending the index range
while (ExtendingRange(fitError, data, from, next_cusp, ref to, ref is_a_cusp, ref done))
{
;
}
// Find the tangent
if (!data.Tangent(ref tanEnd, to, prev_cusp, next_cusp, true, is_a_cusp))
{
return(false);
}
// Add bezier segment
if (!AddBezierSegment(data, from, ref tanStart, to, ref tanEnd))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Construct bezier curve from data points
/// </summary>
/// <param name="data">In: Data points</param>
/// <param name="fitError">In: tolerated error</param>
/// <returns>Whether bezier construction is possible</returns>
private bool ConstructFromData(CuspData data, double fitError)
{
// Check for empty stroke
if (data.Count < 2)
{
return false;
}
// Add the first point
AddBezierPoint(data.XY(0));
// Special cases - 2 or 3 points
if (data.Count == 3)
{
AddParabola(data, 0);
return true;
}
else if (data.Count == 2)
{
AddLine(data, 0, 1);
return true;
}
// For default case error passed in will be 0.
// 3% is the default value
if (DoubleUtil.DBL_EPSILON > fitError)
fitError = 0.03f * (data.Distance() * StrokeCollectionSerializer.HimetricToAvalonMultiplier);
data.SetTanLinks(0.5f * fitError);
// otherwise use the value specified in the drawing attribute
// get (error)^2
fitError *= (fitError);
bool done = false;
int to = 0;
int next_cusp = 0;
int prev_cusp = 0;
bool is_a_cusp = true;
Vector tanEnd = new Vector(0, 0);
Vector tanStart = new Vector(0, 0);
for (int from = 0; !done; from = to)
{
if (is_a_cusp)
{
prev_cusp = next_cusp;
next_cusp = data.GetNextCusp(from);
if (!data.Tangent(ref tanStart, from, prev_cusp, next_cusp, false, true))
{
return false;
}
}
else
{
tanStart.X = -tanEnd.X;
tanStart.Y = -tanEnd.Y;
}
to = from + 3;
// No meat in this loop, just extending the index range
while (ExtendingRange(fitError, data, from, next_cusp, ref to, ref is_a_cusp, ref done));
// Find the tangent
if (!data.Tangent(ref tanEnd, to, prev_cusp, next_cusp, true, is_a_cusp))
{
return false;
}
// Add bezier segment
if (!AddBezierSegment(data, from, ref tanStart, to, ref tanEnd))
{
return false;
}
}
return true;
}
