public ConnectionLeg DrawInitialLegToShape()
{
ConnectionLeg leg = null;
LineCoordinates legCoor = null;
Point? legStart = null;
// starting side
var fromSide = this.FromSide;
var toShapeInfo = new SideToShapeInfo(fromSide, this.ToShape);
// the direction of the initial line.
var dir = fromSide.WhichSide.ToDirection();
// draw horizontal line staight to the target shape.
if (toShapeInfo.HorizDirection.Equals(dir) &&
(toShapeInfo.VertIntersect != null) &&
(toShapeInfo.VertIntersect.Length > 0))
{
var vi = toShapeInfo.VertIntersect;
double centeredIntersect1 = vi.Line1Ofs + (vi.Length / 2);
legStart = vi.Line1.CalcVerticalPointOnLine(centeredIntersect1);
double centeredIntersect2 = vi.Line2Ofs + (vi.Length / 2);
Point toPt = vi.Line2.CalcVerticalPointOnLine(centeredIntersect2);
legCoor = new LineCoordinates(legStart.Value, toPt);
}
// draw vertical staight to the target shape.
else if (toShapeInfo.VertDirection.Equals(dir) &&
(toShapeInfo.HorizIntersect != null) &&
(toShapeInfo.HorizIntersect.Length > 0))
{
var hi = toShapeInfo.HorizIntersect;
double centeredIntersect1 = hi.Line1Ofs + (hi.Length / 2);
legStart = hi.Line1.CalcHorizontalPointOnLine(centeredIntersect1);
double centeredIntersect2 = hi.Line2Ofs + (hi.Length / 2);
Point toPt = hi.Line2.CalcHorizontalPointOnLine(centeredIntersect2);
legCoor = new LineCoordinates(legStart.Value, toPt);
}
// drawing a vertical line.
// The end destination shape is in the direction of the vertical line.
// ( ex: drawing the line down and the shape is below the side )
// Draw the line to the mid point of the vertical side of the to_shape.
else if (toShapeInfo.VertDirection.Equals(dir))
{
// start the leg at the mid point of the start from side.
legStart = fromSide.LineCoor.MidPoint;
// draw the line down ( or up ) to the mid point of the vertical side
// ( either left or right side ) of the "to shape".
var toY = toShapeInfo.VertSide.MidPoint.Y;
var legEnd = new Point(legStart.Value.X, toY);
legCoor = new LineCoordinates(legStart.Value, legEnd);
}
// drawing a horizontal line.
// The end destination shape is in the direction of the horizontal line.
// ( ex: drawing the line to the right and the shape is to the righ of the side )
// Draw the line to the mid point of the horizonntal side of the to_shape.
else if (toShapeInfo.HorizDirection.Equals(dir))
{
// start the leg at the mid point of the start from side.
legStart = fromSide.LineCoor.MidPoint;
// draw the line left ( or right ) to the mid point of the horiz side
var toX = toShapeInfo.HorizSide.MidPoint.X;
var legEnd = new Point(toX, legStart.Value.Y);
legCoor = new LineCoordinates(legStart.Value, legEnd);
}
// create the leg.
if (legCoor != null)
{
leg = new ConnectionLeg()
{
Direction = dir,
LineCoor = legCoor,
Start = legStart.Value
};
}
// draw a short line from the shape to the next available orbit location
// around the from shape.
else
{
leg = ConnectionLeg.DrawLegToOrbit(this.FromSide.Shape, this.FromSide.WhichSide);
}
return(leg);
}
/// <summary>
/// Fill and return a SideToShapeInfo object with info on
/// </summary>
/// <param name="Shape"></param>
/// <param name="Side"></param>
/// <returns></returns>
public static SideToShapeInfo DirectionToShape(this Shape Shape, ShapeSide Side)
{
var info = new SideToShapeInfo(Side, Shape);
return info;
}
