public IPoint OffSetPointForArrow(IPoint point, ConnectorDirectionEnum direction)
{
switch (direction)
{
case ConnectorDirectionEnum.Left:
return(new Point(point.X + ARROW_LN, point.Y));
case ConnectorDirectionEnum.Right:
return(new Point(point.X - ARROW_LN, point.Y));
case ConnectorDirectionEnum.Up:
return(new Point(point.X, point.Y + ARROW_LN));
case ConnectorDirectionEnum.Down:
return(new Point(point.X, point.Y - ARROW_LN));
}
return(point);
}
public IEnumerable <IPoint> GenerateArrow(IPoint p, ConnectorDirectionEnum direction)
{
switch (direction)
{
case ConnectorDirectionEnum.Left:
yield return(new Point(p.X, p.Y - ARROW_LN));
yield return(new Point(p.X - ARROW_LN, p.Y));
yield return(new Point(p.X, p.Y + ARROW_LN));
break;
case ConnectorDirectionEnum.Right:
yield return(new Point(p.X, p.Y - ARROW_LN));
yield return(new Point(p.X + ARROW_LN, p.Y));
yield return(new Point(p.X, p.Y + ARROW_LN));
break;
case ConnectorDirectionEnum.Up:
yield return(new Point(p.X - ARROW_LN, p.Y));
yield return(new Point(p.X, p.Y - ARROW_LN));
yield return(new Point(p.X + ARROW_LN, p.Y));
break;
case ConnectorDirectionEnum.Down:
yield return(new Point(p.X - ARROW_LN, p.Y));
yield return(new Point(p.X, p.Y + ARROW_LN));
yield return(new Point(p.X + ARROW_LN, p.Y));
break;
}
}
private IEnumerable <IPoint> GeneratePath(IPoint start, IPoint end, ConnectorDirectionEnum dirStart, ConnectorDirectionEnum dirEnd)
{
yield return(start);
if (dirStart == dirEnd)
{
if (dirStart == ConnectorDirectionEnum.Right || dirStart == ConnectorDirectionEnum.Left)
{
var halfDeltaX = (end.X - start.X) / 2;
yield return(new Point(start.X + halfDeltaX, start.Y));
yield return(new Point(start.X + halfDeltaX, end.Y));
}
if (dirStart == ConnectorDirectionEnum.Up || dirStart == ConnectorDirectionEnum.Down)
{
var halfDeltaY = (end.Y - start.Y) / 2;
yield return(new Point(start.X, start.Y + halfDeltaY));
yield return(new Point(end.X, start.Y + halfDeltaY));
}
}
yield return(end);
}
