private static UIElement GetPolyLine(Point from, Point to, Brush stroke)
{
var line = new ArrowPolyline();
line.Stroke = stroke;
line.StrokeThickness = 2.0;
line.ArrowEnds = ArrowEnds.End;
line.ArrowLength = 8;
line.Points.Add(from);
if (from.Y != to.Y)
{
line.Points.Add(new Point(from.X, to.Y));
}
line.Points.Add(to);
return(line);
}
private void DrawLinks()
{
// remove all links
drawnLinks.Clear();
for (int i = 0; i <= graphCanvas.Children.Count - 1; i++)
{
var child = graphCanvas.Children[i];
if (child is ArrowLineBase)
{
graphCanvas.Children.RemoveAt(i);
i--;
}
}
// draw links
foreach (var node in drawnNodes.Keys)
{
Point startPosition = drawnNodes[node].Point;
foreach (var link in node.Links)
{
if (drawnLinks.ContainsKey(link))
{
continue;
}
if (link.IsLoop)
{
ArrowPolyline apoly = new ArrowPolyline()
{
Stroke = this.linkColor, StrokeThickness = 0.5, ArrowAngle = 25, ArrowLength = 6
};
apoly.ArrowEnds = graph.GraphType == GraphType.Undirected ? ArrowEnds.None : ArrowEnds.End;
Point nodePosition = drawnNodes[link.Node1].Point;
apoly.Points.Add(nodePosition);
apoly.Points.Add(new Point(nodePosition.X, nodePosition.Y + nodeRadius * 2));
apoly.Points.Add(new Point(nodePosition.X + nodeRadius * 2, nodePosition.Y + nodeRadius * 2));
apoly.Points.Add(new Point(nodePosition.X + nodeRadius * 2, nodePosition.Y));
apoly.Points.Add(new Point(nodePosition.X + nodeRadius, nodePosition.Y));
graphCanvas.Children.Add(apoly);
drawnLinks.Add(link, apoly);
Label lbl = new Label()
{
Content = link.Weight.ToString(), Foreground = nodeNameColor, FontWeight = FontWeights.Bold
};
Canvas.SetLeft(lbl, apoly.Points.Last().X + nodeRadius);
Canvas.SetTop(lbl, apoly.Points.Last().Y + nodeRadius);
Canvas.SetZIndex(lbl, 101);
graphCanvas.Children.Add(lbl);
}
else
{
Point endPosition = drawnNodes[link.Node2].Point;
if (graph.GraphType == GraphType.Undirected)
{
if (node == link.Node2)
{
endPosition = drawnNodes[link.Node1].Point;
}
}
Petzold.Media2D.ArrowLine line = new Petzold.Media2D.ArrowLine()
{
Stroke = this.linkColor, StrokeThickness = 1, ArrowAngle = 25, ArrowLength = 6
};
line.ArrowEnds = graph.GraphType == GraphType.Undirected ? ArrowEnds.None : ArrowEnds.End;
line.X1 = startPosition.X;
line.Y1 = startPosition.Y;
Point endPoint = new Point();
if (endPosition.X - startPosition.X == 0 || endPosition.Y - startPosition.Y == 0)
{
endPoint.X = endPosition.X;
endPoint.Y = endPosition.Y;
}
else
{
double alpha = Math.Atan(Math.Abs((endPosition.Y - startPosition.Y) / (endPosition.X - startPosition.X)));
double sinAlpha = Math.Abs(Math.Sin(alpha));
double cosAlpha = Math.Abs(Math.Cos(alpha));
if (endPosition.X > startPosition.X && endPosition.Y < startPosition.Y) //first quarter
{
endPoint.X = endPosition.X - ((double)nodeRadius) * cosAlpha;
endPoint.Y = endPosition.Y + ((double)nodeRadius) * sinAlpha;
}
else if (endPosition.X > startPosition.X && endPosition.Y > startPosition.Y) //second quarter
{
endPoint.X = endPosition.X - ((double)nodeRadius) * cosAlpha;
endPoint.Y = endPosition.Y - ((double)nodeRadius) * sinAlpha;
}
else if (endPosition.X < startPosition.X && endPosition.Y > startPosition.Y) //third quarter
{
endPoint.X = endPosition.X + ((double)nodeRadius) * cosAlpha;
endPoint.Y = endPosition.Y - ((double)nodeRadius) * sinAlpha;
}
else if (endPosition.X < startPosition.X && endPosition.Y < startPosition.Y) //fourth quarter
{
endPoint.X = endPosition.X + ((double)nodeRadius) * cosAlpha;
endPoint.Y = endPosition.Y + ((double)nodeRadius) * sinAlpha;
}
}
line.X2 = endPoint.X;
line.Y2 = endPoint.Y;
graphCanvas.Children.Add(line);
line.MouseDown += Line_MouseDown;
line.Tag = link;
drawnLinks.Add(link, line);
Canvas.SetZIndex(line, 99);
// add link weight to canvas
var p = new Point((line.X1 + line.X2) / 2, (line.Y1 + line.Y2) / 2);
Label lbl = new Label()
{
Content = link.Weight.ToString(), Foreground = nodeNameColor, FontWeight = FontWeights.Bold
};
Canvas.SetLeft(lbl, p.X - nodeRadius);
Canvas.SetTop(lbl, p.Y - nodeRadius);
Canvas.SetZIndex(lbl, 101);
graphCanvas.Children.Add(lbl);
}
}
}
}
/// <summary>
/// The arrow demo is uses an adaption of Charles Petzold's WPF arrow class
/// http://charlespetzold.com/blog/2007/04/191200.html to be used as custom MapShape
/// </summary>
/// <param name="layer"></param>
public void AddArrows(ShapeLayer layer)
{
// ArrowLine with animated arrow properties.
var arrowLine1 = new ArrowLine
{
Stroke = Brushes.Red,
MapStrokeThickness = 30,
ScaleFactor = .25,
ArrowLength = 3,
X1 = 8.100,
Y1 = 49.400,
X2 = 8.400,
Y2 = 49.100
};
// the adaptive stroke thickness
// the scale factor [0..1]. 0: Don't scale (thickness = pixels); 1: scale linear (thickness = mercator units)
// the arrow length is relative to the arrow stroke thickness
layer.Shapes.Add(arrowLine1);
var doubleAnimation1 = new DoubleAnimation(10, 50, new Duration(new TimeSpan(0, 0, 5)))
{
AutoReverse = true,
RepeatBehavior = RepeatBehavior.Forever
};
arrowLine1.BeginAnimation(ArrowLineBase.ArrowAngleProperty, doubleAnimation1);
var doubleAnimation2 = new DoubleAnimation(1, 20, new Duration(new TimeSpan(0, 0, 5)))
{
AutoReverse = true,
RepeatBehavior = RepeatBehavior.Forever
};
arrowLine1.BeginAnimation(ArrowLineBase.ArrowLengthProperty, doubleAnimation2);
// ArrowLine with animated point properties.
var arrowLine2 = new ArrowLine
{
ArrowEnds = ArrowEnds.Both,
Stroke = Brushes.Blue,
MapStrokeThickness = 30,
ScaleFactor = .25
};
arrowLine1.ArrowLength = 3;
arrowLine2.X1 = 8.100;
arrowLine2.Y1 = 49.100;
arrowLine2.X2 = 8.200;
arrowLine2.Y2 = 49.400;
layer.Shapes.Add(arrowLine2);
AnimationTimeline doubleAnimation3 = new DoubleAnimation(8.100, 8.400, new Duration(new TimeSpan(0, 0, 5)));
doubleAnimation3.AutoReverse = true;
doubleAnimation3.RepeatBehavior = RepeatBehavior.Forever;
arrowLine2.BeginAnimation(ArrowLine.X1Property, doubleAnimation3);
AnimationTimeline doubleAnimation4 = new DoubleAnimation(49.400, 49.100, new Duration(new TimeSpan(0, 0, 5)));
doubleAnimation4.AutoReverse = true;
doubleAnimation4.RepeatBehavior = RepeatBehavior.Forever;
arrowLine2.BeginAnimation(ArrowLine.Y2Property, doubleAnimation4);
// ArrowPolyline rotated.
var arrowPolyline = new ArrowPolyline
{
ArrowEnds = ArrowEnds.Both,
Stroke = Brushes.Green,
MapStrokeThickness = 30,
ScaleFactor = .25
};
arrowLine1.ArrowLength = 3;
arrowPolyline.Points.Add(new Point(8.25, 49.25));
arrowPolyline.Points.Add(new Point(8.125, 49.25));
arrowPolyline.Points.Add(new Point(8.125, 49.125));
arrowPolyline.Points.Add(new Point(8.25, 49.125));
layer.Shapes.Add(arrowPolyline);
// the rotation center of the canvas needs to be calculated for a rotate transform
// only works after the shape has been added to the canvas.
var rotateCenter = arrowPolyline.GeoTransform(new Point(8, 49));
var rotateTransform = new RotateTransform(0, rotateCenter.X, rotateCenter.Y);
arrowPolyline.RenderTransform = rotateTransform;
AnimationTimeline animaDouble5 = new DoubleAnimation(0, 360, new Duration(new TimeSpan(0, 0, 10)));
animaDouble5.RepeatBehavior = RepeatBehavior.Forever;
rotateTransform.BeginAnimation(RotateTransform.AngleProperty, animaDouble5);
}
