/// <summary>
/// Creates outline curves from the path curves computed by Potrace.
/// Also cooks up the conduit bounding box.
/// </summary>
private int CreateOutlineCurves()
{
OutlineCurves.Clear();
// The first curve is always the border curve no matter what
var corners = new Point3d[] {
Point3d.Origin,
new Point3d(m_bitmap.Width, 0.0, 0.0),
new Point3d(m_bitmap.Width, m_bitmap.Height, 0.0),
new Point3d(0.0, m_bitmap.Height, 0.0),
Point3d.Origin
};
var border = new PolylineCurve(corners);
OutlineCurves.Add(border);
foreach (var path_curve in m_path_curves)
{
switch (GetPathCurveType(path_curve))
{
case PathCurveType.LineCurve:
{
var curve = path_curve[0].ToLineCurve();
if (null != curve && curve.IsValid && !curve.IsShort(m_tolerance))
{
OutlineCurves.Add(curve);
}
}
break;
case PathCurveType.BezierCurve:
{
var curve = path_curve[0].ToNurbsCurve();
if (null != curve && curve.IsValid && !curve.IsShort(m_tolerance))
{
OutlineCurves.Add(curve);
}
}
break;
case PathCurveType.PolylineCurve:
{
var points = new List <Point3d>();
for (var i = 0; i < path_curve.Count; i++)
{
if (i == 0)
{
points.Add(path_curve[i].A.ToPoint3d());
}
points.Add(path_curve[i].B.ToPoint3d());
}
var curve = new PolylineCurve(points);
curve.MakeClosed(m_tolerance);
curve.RemoveShortSegments(m_tolerance);
if (curve.IsValid && !curve.IsShort(m_tolerance))
{
OutlineCurves.Add(curve);
}
}
break;
case PathCurveType.PolyCurve:
{
var curve = new PolyCurve();
foreach (var path in path_curve)
{
if (path.Kind == CurveKind.Line)
{
var c = path.ToLineCurve();
if (null != c && c.IsValid && !c.IsShort(m_tolerance))
{
curve.Append(c);
}
}
else
{
var c = path.ToNurbsCurve();
if (null != c && c.IsValid && !c.IsShort(m_tolerance))
{
curve.Append(c);
}
}
}
curve.MakeClosed(m_tolerance);
curve.RemoveShortSegments(m_tolerance);
if (curve.IsValid && !curve.IsShort(m_tolerance))
{
OutlineCurves.Add(curve);
}
}
break;
}
}
if (OutlineCurves.Count > 0)
{
// Just use the border curve
m_bbox = OutlineCurves[0].GetBoundingBox(true);
//for (var i = 0; i < OutlineCurves.Count; i++)
// m_bbox.Union(OutlineCurves[i].GetBoundingBox(true));
}
// The origin of the bitmap coordinate system is at the top-left corner of the bitmap.
// So, create a mirror transformation so the output is oriented to Rhino's world xy plane.
var mirror = Transform.Mirror(m_bbox.Center, Vector3d.YAxis);
m_bbox.Transform(mirror);
for (var i = 0; i < OutlineCurves.Count; i++)
{
OutlineCurves[i].Transform(mirror);
}
// Scale the output, per the calculation made in the command.
if (m_scale != 1.0)
{
var scale = Transform.Scale(Point3d.Origin, m_scale);
m_bbox.Transform(scale);
for (var i = 0; i < OutlineCurves.Count; i++)
{
OutlineCurves[i].Transform(scale);
}
}
return(OutlineCurves.Count);
}