/// <summary>Constrcutor</summary>
/// <param name="directedGraphArc">The arc information to use</param>
/// <param name="allNodes">A list of all nodes</param>
public DGArc(Arc directedGraphArc, List <DGNode> allNodes)
{
Location = new PointD(directedGraphArc.Location.X, directedGraphArc.Location.Y);
SourceNode = allNodes.Find(node => node.Name == directedGraphArc.SourceName);
TargetNode = allNodes.Find(node => node.Name == directedGraphArc.DestinationName);
Colour = OxyColor.FromRgb(directedGraphArc.Colour.R, directedGraphArc.Colour.G, directedGraphArc.Colour.B);
Name = directedGraphArc.Text;
}
/// <summary>Paint on the graphics context</summary>
/// <param name="context">The graphics context to draw on</param>
public override void Paint(Cairo.Context context)
{
CalcBezPoints();
if (BezPoints.Count != 0)
{
// Create point for upper-left corner of drawing.
context.NewPath();
if (Selected)
{
context.SetSourceColor(OxyColors.Blue);
}
else
{
context.SetSourceColor(Colour);
}
// Draw text if necessary
if (Name != null)
{
DGNode.DrawCentredText(context, Name, Location);
}
context.MoveTo(BezPoints[0]);
PointD controlPoint = new PointD(Location.X, Location.Y);
context.CurveTo(controlPoint, controlPoint, BezPoints[BezPoints.Count - 1]);
context.Stroke();
// find closest point in the bezPoints to the intersection point that is outside the target
// work backwards through BezPoints array and use the first one that is outside the target
for (int i = BezPoints.Count - 1; i >= 0; i--)
{
PointD arrowHead;
if (!TargetNode.HitTest(BezPoints[i]))
{
arrowHead = BezPoints[i];
i--;
//keep moving along the line until distance = target radius
double targetRadius = TargetNode.Width / 2;
while (i >= 0)
{
double dist = GetDistance(BezPoints[i], arrowHead);
if (dist >= 20)
{
DrawArrow(context, BezPoints[i], arrowHead);
break;
}
i--;
}
break;
}
}
}
}