private Line2D m_line = new Line2D(); // geometry line to draw
#endregion Fields
#region Constructors
/// <summary>
/// constructor
/// </summary>
/// <param name="line"></param>
public LineSketch(Line2D line)
{
m_line = line;
m_boundingBox = line.BoundingBox;
m_pen.Color = System.Drawing.Color.Yellow;
m_pen.Width = 1f;
}
/// <summary>
/// transform 3d point to 2d (if all points in the same plane)
/// </summary>
private void Frame3DTo2D(ReadOnlyCollection<Line3D> line3Ds)
{
const double LengthEpsilon = 0.01;
const double AngleEpsilon = 0.1;
// find 3 points to form 2 lines whose length is bigger than LengthEpsilon
// and angle between them should be bigger than AngleEpsilon
Line3D line0 = line3Ds[0];
Vector vector0 = new Vector();
Vector vector1 = new Vector();
// to find the first 2 points to form first line
int index = 0;
for (int i = 1; i < line3Ds.Count; i++)
{
vector0 = line3Ds[i].StartPoint - line0.StartPoint;
if (vector0.GetLength() > LengthEpsilon)
{
index = i;
break;
}
}
if (index == 0)
{
return;
}
// to find the last points to form the second line
for (int j = index + 1; j < line3Ds.Count; j++)
{
vector1 = line3Ds[j].StartPoint - line3Ds[index].StartPoint;
double angle = Vector.GetAngleOf2Vectors(vector0, vector1, true);
if (vector1.GetLength() > LengthEpsilon && angle > AngleEpsilon)
{
break;
}
}
// find the local coordinate system in which the profile of opening is horizontal
Vector zAxis = (vector0 & vector1).GetNormal();
Vector xAxis = zAxis & (new Vector(0.0, 1.0, 0.0));
Vector yAxis = zAxis & xAxis;
Vector origin = new Vector(0.0, 0.0, 0.0);
UCS ucs = new UCS(origin, xAxis, yAxis);
// transform all the 3D lines to UCS and create accordingly 2D lines
bool isFirst = true;
foreach (Line3D line in line3Ds)
{
Line3D tmp = ucs.GC2LC(line);
PointF startPnt = new PointF((float)tmp.StartPoint.X, (float)tmp.StartPoint.Y);
PointF endPnt = new PointF((float)tmp.EndPoint.X, (float)tmp.EndPoint.Y);
Line2D line2D = new Line2D(startPnt, endPnt);
LineSketch aLineSketch = new LineSketch(line2D);
if (isFirst)
{
m_boundingBox = aLineSketch.BoundingBox;
isFirst = false;
}
else
{
m_boundingBox = RectangleF.Union(m_boundingBox, aLineSketch.BoundingBox);
}
m_objects.Add(aLineSketch);
}
}
