internal void Add(SideOffset subitem)
{
if (subitem == null)
{
throw new ArgumentNullException(nameof(subitem));
}
_subitems.Add(subitem);
}
internal static Line Create(SideOffset model)
{
if (!IsValidLineSide(model.Start, model.End, model.Side))
{
throw new ArgumentException();
}
return LineOffset(model);
}
private void AddItem(int side, float x1, float y1, float x2, float y2)
{
var item = new SideOffset
{
Side = side,
Start = new PointF(x1, y1),
End = new PointF(x2, y2)
};
this.SideOffsets.Add(item);
this.MainOffset.Add(item);
}
private static Line LineOffset(SideOffset model)
{
float x1 = model.Start.X;
float x2 = model.End.X;
float y1 = model.Start.Y;
float y2 = model.End.Y;
double len = Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
float offsetPixels = model.Offset;
float x1p = (float)(x1 - offsetPixels * (y2-y1) / len);
float x2p = (float)(x2 - offsetPixels * (y2-y1) / len);
float y1p = (float)(y1 - offsetPixels * (x1-x2) / len);
float y2p = (float)(y2 - offsetPixels * (x1-x2) / len);
return new Line(model.Side, new PointF(x1p, y1p), new PointF(x2p, y2p));
}