private void myDiagram_Loaded(object sender, RoutedEventArgs e)
{
LocationStoryBoard = new Storyboard();
// The time for each complete revolution is equal to one second for each node in the outer circle.
Duration duration = new Duration(TimeSpan.FromSeconds(NumberOfNodes - 1));
LocationStoryBoard.Duration = duration;
// All of the animations repeat continuously.
LocationStoryBoard.RepeatBehavior = RepeatBehavior.Forever;
foreach (Node n in myDiagram.Nodes)
{
MyNodeData mnd = n.Data as MyNodeData;
if (mnd.Key < 0)
{
continue;
}
// The NodePanel should be the first visual child of a Node.
try {
AnimateNode(mnd.Key, n.VisualElement as NodePanel, duration);
} catch (Exception) { }
}
LocationStoryBoard.Begin();
myDiagram.MouseLeftButtonUp += new MouseButtonEventHandler(myDiagram_PauseResumeAnimation);
}
// Adds individual animations to the locationAnimation StoryBoard.
private void AnimateNode(int key, NodePanel np, Duration duration)
{
if (key < 0)
{
return;
}
if (np == null)
{
return;
}
PointAnimationUsingKeyFrames locationAnimation = new PointAnimationUsingKeyFrames();
double keyTime = 0.0;
// Gets the LinearPointKeyFrames for the PointAnimationUsingKeyFrames.
// Starts at key-1 to account for an initial KeyFrame.
for (int i = key - 1; i < (key + NumberOfNodes - 1); i++)
{
LinearPointKeyFrame lpkf = new LinearPointKeyFrame();
lpkf.KeyTime = TimeSpan.FromSeconds(keyTime);
int nextNodeKeyInt = i + 1;
if (nextNodeKeyInt >= (NumberOfNodes - 1))
{
nextNodeKeyInt = nextNodeKeyInt % (NumberOfNodes - 1);
}
MyNodeData nextNodeData = myDiagram.Model.FindNodeByKey((nextNodeKeyInt)) as MyNodeData;
if (nextNodeData == null || nextNodeData.Location == null)
{
return;
}
lpkf.Value = nextNodeData.Location;
locationAnimation.KeyFrames.Add(lpkf);
// If duration equals TimeSpan.FromSeconds(NumberOfNodes - 1),
// then keyTime increases by 1 with each iteration.
keyTime += ((double)duration.TimeSpan.TotalSeconds) / (NumberOfNodes - 1);
}
LocationStoryBoard.Children.Add(locationAnimation);
Storyboard.SetTarget(locationAnimation, np);
Storyboard.SetTargetProperty(locationAnimation, new PropertyPath(Node.LocationProperty));
}
public Arrowheads()
{
InitializeComponent();
// Initialize a new GraphLinksModel
var model = new GraphLinksModel <MyNodeData, int, string, MyLinkData>();
model.NodeKeyPath = "Key";
model.LinkLabelNodePath = "";
var nodesSource = new ObservableCollection <MyNodeData> {
};
model.NodesSource = nodesSource;
model.LinksSource = new ObservableCollection <MyLinkData> {
};
model.Modifiable = true; // enables AddNode and AddLink, below
// Create the big node in the center
CenterNode = new MyNodeData()
{
Key = -1,
Diameter = CenterNodeDiameter,
Text = "Click to\rPause!"
};
CenterNode.Location = new Point(0, 0);
model.AddNode(CenterNode);
// Create outer nodes and links to them from the center node,
// for each pair of Arrowhead enum values.
int i = 1;
while (Enum.IsDefined(typeof(Arrowhead), i))
{
MyNodeData mnd = new MyNodeData()
{
Key = (i / 2),
Diameter = OuterNodeDiameter
};
model.AddNode(mnd);
Arrowhead fromarrow = Arrowhead.None;
if (Enum.IsDefined(typeof(Arrowhead), i + 1))
{
fromarrow = (Arrowhead)(i + 1);
}
model.AddLink(new MyLinkData()
{
ToArrow = (Arrowhead)i,
FromArrow = fromarrow,
Text = ((Arrowhead)i).ToString(),
From = CenterNode.Key,
To = mnd.Key
});
i += 2;
}
// The expression (NumberOfNodes - 1) is often used to ignore the center node.
NumberOfNodes = nodesSource.Count;
// Calculates the SpokeLength so that the distance between the centers
// of consecutive nodes is equal to RimSegmentLength.
SpokeLength = (RimSegmentLength + OuterNodeDiameter)
* Math.Sin(0.5 * (Math.PI - 2 * Math.PI / (NumberOfNodes - 1)))
/ Math.Sin(2 * Math.PI / (NumberOfNodes - 1));
// Doesn't allow SpokeLength to be too close to the centerNode's edge.
double minSpokeLength = (0.75 * CenterNodeDiameter);
if (SpokeLength < minSpokeLength)
{
SpokeLength = minSpokeLength;
}
// Assign the node Locations.
double currentAngle = 0.0, currentX = 0.0, currentY = 0.0;
for (int j = 1; j < NumberOfNodes; j++)
{
currentX = SpokeLength * Math.Cos(currentAngle);
currentY = SpokeLength * Math.Sin(currentAngle);
MyNodeData node = nodesSource[j];
node.Location = new Point(currentX, currentY);
currentAngle = (j) * (2 * Math.PI / (NumberOfNodes - 1));
}
myDiagram.Model = model;
}
