public static LineBuilder ContinueDrawingLine(this LineBuilder builder, StreamGeometryContext ctx)
{
var end_point = builder.GetEndPoint();
ctx.LineTo(end_point, true, false);
builder.End = end_point;
return builder;
}
public static LineBuilder BuildLineSegment(this LineBuilder builder, StreamGeometryContext ctx)
{
var end_point = builder.GetEndPoint();
ctx.BeginFigure(builder.Start, true, false);
ctx.LineTo(end_point, true, false);
return builder;
}