/// <summary>
/// Set links amongst the points for tangent computation
/// </summary>
/// <param name="rError">Shortest distance between two distinct points</param>
internal void SetTanLinks(double rError)
{
int count = Count;
if (rError < 1.0)
{
rError = 1.0f;
}
for (int i = 0; i < count; ++i)
{
// Find a StylusPoint at distance-_span forward
for (int j = i + 1; j < count; j++)
{
if (_nodes[j] - _nodes[i] >= rError)
{
CDataPoint cdp = _points[i];
cdp.TanNext = j;
_points[i] = cdp;
CDataPoint cdp2 = _points[j];
cdp2.TanPrev = i;
_points[j] = cdp2;
break;
}
}
if (0 > _points[i].TanPrev)
{
for (int j = i - 1; 0 <= j; --j)
{
if (_nodes[i] - _nodes[j] >= rError)
{
CDataPoint cdp = _points[i];
cdp.TanPrev = j;
_points[i] = cdp;
break;
}
}
}
if (0 > _points[i].TanNext)
{
CDataPoint cdp = _points[i];
cdp.TanNext = count - 1;
_points[i] = cdp;
}
if (0 > _points[i].TanPrev)
{
CDataPoint cdp = _points[i];
cdp.TanPrev = 0;
_points[i] = cdp;
}
}
}
/// <summary>
/// Constructs internal data structure from points for doing operations like
/// cusp detection or tangent computation
/// </summary>
/// <param name="stylusPoints">Points to be analyzed</param>
/// <param name="rSpan">Distance between two consecutive distinct points</param>
internal void Analyze(StylusPointCollection stylusPoints, double rSpan)
{
// If the count is less than 1, return
if ((null == stylusPoints) || (stylusPoints.Count == 0))
{
return;
}
_points = new List <CDataPoint>(stylusPoints.Count);
_nodes = new List <double>(stylusPoints.Count);
// Construct the lists of data points and nodes
_nodes.Add(0);
CDataPoint cdp0 = new CDataPoint();
cdp0.Index = 0;
//convert from Avalon to Himetric
Point point = (Point)stylusPoints[0];
point.X *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
point.Y *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
cdp0.Point = point;
_points.Add(cdp0);
//drop duplicates
int index = 0;
for (int i = 1; i < stylusPoints.Count; i++)
{
if (!DoubleUtil.AreClose(stylusPoints[i].X, stylusPoints[i - 1].X) ||
!DoubleUtil.AreClose(stylusPoints[i].Y, stylusPoints[i - 1].Y))
{
//this is a unique point, add it
index++;
CDataPoint cdp = new CDataPoint();
cdp.Index = index;
//convert from Avalon to Himetric
Point point2 = (Point)stylusPoints[i];
point2.X *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
point2.Y *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
cdp.Point = point2;
_points.Insert(index, cdp);
_nodes.Insert(index, _nodes[index - 1] + (XY(index) - XY(index - 1)).Length);
}
}
SetLinks(rSpan);
}
/// <summary>
/// Constructs internal data structure from points for doing operations like
/// cusp detection or tangent computation
/// </summary>
/// <param name="stylusPoints">Points to be analyzed</param>
/// <param name="rSpan">Distance between two consecutive distinct points</param>
internal void Analyze(StylusPointCollection stylusPoints, double rSpan)
{
// If the count is less than 1, return
if ((null == stylusPoints) || (stylusPoints.Count == 0))
return;
_points = new List<CDataPoint>(stylusPoints.Count);
_nodes = new List<double>(stylusPoints.Count);
// Construct the lists of data points and nodes
_nodes.Add(0);
CDataPoint cdp0 = new CDataPoint();
cdp0.Index = 0;
//convert from Avalon to Himetric
Point point = (Point)stylusPoints[0];
point.X *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
point.Y *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
cdp0.Point = point;
_points.Add(cdp0);
//drop duplicates
int index = 0;
for (int i = 1; i < stylusPoints.Count; i++)
{
if (!DoubleUtil.AreClose(stylusPoints[i].X, stylusPoints[i - 1].X) ||
!DoubleUtil.AreClose(stylusPoints[i].Y, stylusPoints[i - 1].Y))
{
//this is a unique point, add it
index++;
CDataPoint cdp = new CDataPoint();
cdp.Index = index;
//convert from Avalon to Himetric
Point point2 = (Point)stylusPoints[i];
point2.X *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
point2.Y *= StrokeCollectionSerializer.AvalonToHimetricMultiplier;
cdp.Point = point2;
_points.Insert(index, cdp);
_nodes.Insert(index, _nodes[index - 1] + (XY(index) - XY(index - 1)).Length);
}
}
SetLinks(rSpan);
}
