SharpNeat.View.Graph.IOGraphPainter.PaintConnection C# (CSharp) Method

        private void PaintConnection(GraphConnection con, PaintState state)
        {
            Point srcPos = ModelToViewport(con.SourceNode.Position, state);
            Point tgtPos = ModelToViewport(con.TargetNode.Position, state);

            // Connections leave from the base of the source node and enter the top of the target node.
            // Adjust end points to make them neatly terminate just underneath the edge of the endpoint nodes.
            srcPos.Y += (int)(state._nodeDiameterHalf * 0.9f);
            tgtPos.Y -= (int)(state._nodeDiameterHalf * 0.9f);

            // Is any part of the connection within the viewport area?
            if(!IsPointWithinViewport(srcPos, state) && !IsPointWithinViewport(tgtPos, state))
            {   // Skip connection. It's outside the viewport area.
                return;
            }

            // Create a pen for painting the connection.
            // Width is related to connection strength/magnitude.
            float width = (float)(con.Weight < 0.0 ? -Math.Log10(1.0 - con.Weight) : Math.Log10(1.0 + con.Weight));
            width = width * state._connectionWeightToWidth * state._zoomFactor;

            width = Math.Max(1f, Math.Abs(width));
            Pen pen = new Pen(con.Weight < 0f ? _connectionNegative : _connectionPositive, width);
      
            // Draw the connection line.
            if(tgtPos.Y > srcPos.Y)
            {   
                // Target is below the source. Draw a straight line.
                state._g.DrawLine(pen, srcPos, tgtPos);                
            }
            else
            {   
                // Target is above source. Draw a back-connection.
                PaintBackConnection(pen, srcPos, tgtPos,
                                    state.GetNodeStateInfo(con.SourceNode),
                                    state.GetNodeStateInfo(con.TargetNode),
                                    state);
            }
        }