private void AddNode(List <BubbleNode> currentNodes, BubbleNode interativeNode, BubbleNode lastNode, BubbleNode newNode, Point point)
{
newNode.X = point.X;
newNode.Y = point.Y;
newNode.TangentBubbles.Add(lastNode);
newNode.TangentBubbles.Add(interativeNode);
currentNodes.Add(newNode);
}
private BubbleNode CreateBubbleNode(BubbleData data, double maxWeight, double minWeight, double bubbleMaxRadius, double anticipateMinRadius, double margin, int index)
{
//var bubbleRadius = maxWeight == minWeight ? bubbleMaxRadius : (data.Weight - minWeight) * ((bubbleMaxRadius - chart.BubbleAnticipateMinRadius) / (maxWeight - minWeight)) + chart.BubbleAnticipateMinRadius;
var bubbleRadius = maxWeight == minWeight ? bubbleMaxRadius : (data.Weight - minWeight) * ((bubbleMaxRadius - anticipateMinRadius) / (maxWeight - minWeight)) + anticipateMinRadius;
bubbleRadius += margin;
var newNode = new BubbleNode();
newNode.Index = index;
newNode.Radius = bubbleRadius;
newNode.Name = data.Name;
newNode.Shape = new Bubble()
{
Diameter = newNode.Radius * 2
};
if (data.Color != null)
{
newNode.Shape.Fill = data.Color.CloneCurrentValue();
}
else if (chart.BubbleBrushes != null)
{
if (chart.BubbleBrushes.Keys.Contains(newNode.Name))
{
newNode.Shape.Fill = chart.BubbleBrushes[newNode.Name].CloneCurrentValue();
}
}
else if (chart.BubbleBrush != null)
{
newNode.Shape.Fill = chart.BubbleBrush.CloneCurrentValue();
}
newNode.OriginalBrush = newNode.Shape.Fill.CloneCurrentValue();
if (chart.BubbleLabelTemplate != null)
{
newNode.Shape.DataContext = data;
newNode.Shape.ContentTemplate = chart.BubbleLabelTemplate;
newNode.Shape.SetCurrentValue(ContentControl.ContentProperty, data);
}
// for highlighting or other actions
newNode.Shape.Tag = newNode.Name;
newNode.Shape.MouseEnter += NodeMouseEnter;
newNode.Shape.MouseLeave += NodeMouseLeave;
newNode.Shape.MouseLeftButtonUp += NodeMouseLeftButtonUp;
return(newNode);
}
private bool CheckCollision(Point point, BubbleNode node, double newBubbleRadius, double bubbleGap)
{
var collisionAlpha = 0.1;
var differFromPointXAndNodeX = point.X - node.X;
var differFromPointYAndNodeY = point.Y - node.Y;
var distanceBetweenCentersFromNodeToPoint = Math.Sqrt(differFromPointXAndNodeX * differFromPointXAndNodeX + Math.Pow(differFromPointYAndNodeY, 2));
var distanceBetweenCentersFromNodeToNewBubble = node.Radius + newBubbleRadius + bubbleGap;
if (distanceBetweenCentersFromNodeToNewBubble - distanceBetweenCentersFromNodeToPoint > collisionAlpha)
{
return(true);
}
else
{
return(false);
}
}
private void LayoutBubbleNode(BubbleNode newNode, List <BubbleNode> currentNodes, Point canvasCenter, double bubbleGap)
{
// create first bubble
if (currentNodes.Count == 0)
{
newNode.X = canvasCenter.X;
newNode.Y = canvasCenter.Y;
currentNodes.Add(newNode);
return;
}
// create second bubble
if (currentNodes.Count == 1)
{
// set second bubble initial angle to 45
var rad = Math.PI / 180 * 45;
var distanceBetweenCenters = currentNodes[0].Radius + newNode.Radius + bubbleGap;
newNode.X = canvasCenter.X + Math.Sin(rad) * (distanceBetweenCenters + 100);
newNode.Y = canvasCenter.Y + Math.Cos(rad) * (distanceBetweenCenters - 100);
newNode.TangentBubbles.Add(currentNodes[0]);
currentNodes.Add(newNode);
return;
}
var initialAngle = 70;
var lastIndex = currentNodes.Last().Index;
// find second tangent bubble
for (var round = 0; round < currentNodes.Count; round++)
{
var bubbleStack = currentNodes.FindAll(n => n.Index <= lastIndex - round);
var candidateBubbles = new List <BubbleNode>();
if (bubbleStack.Count >= 2)
{
for (var index = bubbleStack.Count - 2; index >= bubbleStack.Last().TangentBubbles.Last().Index; index--)
{
candidateBubbles.Insert(0, bubbleStack[index]);
}
}
var IsNodeAdded = false;
for (var index = 0; index < candidateBubbles.Count; index++)
{
#region prepare for checking collisions
var interativeNode = candidateBubbles[index];
var lastNode = bubbleStack.Last();
var distanceBetweenCentersFromLastNodeToNewBubble = lastNode.Radius + newNode.Radius + bubbleGap;
var distanceBetweenCentersFromInterativeNodeToNewBubble = interativeNode.Radius + newNode.Radius + bubbleGap;
var interativeNodeXRelativeToLastNode = interativeNode.X - lastNode.X;
var interativeNodeYRelativeToLastNode = interativeNode.Y - lastNode.Y;
var squareOfX = Math.Pow(interativeNodeXRelativeToLastNode, 2);
var squareOfY = Math.Pow(interativeNodeYRelativeToLastNode, 2);
var squareOfD1 = Math.Pow(distanceBetweenCentersFromLastNodeToNewBubble, 2);
var sumFromSquareOfXAndSquareOfY = squareOfX + squareOfY;
var differFromSquareOfD1AndSquareOfD2 = squareOfD1 - Math.Pow(distanceBetweenCentersFromInterativeNodeToNewBubble, 2);
var sumFromSumFromSquareOfXAndSquareOfYAndDifferFromSquareOfD1AndSquareOfD2 = sumFromSquareOfXAndSquareOfY + differFromSquareOfD1AndSquareOfD2;
// find the third ecllipse
var a = 4 * sumFromSquareOfXAndSquareOfY;
var b = -4 * interativeNodeYRelativeToLastNode * sumFromSumFromSquareOfXAndSquareOfYAndDifferFromSquareOfD1AndSquareOfD2;
var c = Math.Pow(sumFromSumFromSquareOfXAndSquareOfYAndDifferFromSquareOfD1AndSquareOfD2, 2) - 4 * squareOfX * squareOfD1;
var squareOfB = Math.Pow(b, 2);
var aMultiplycMultiply4 = 4 * a * c;
var solutionOfQuadraticEquation = squareOfB - aMultiplycMultiply4;
var aMultiply2 = 2 * a;
var xMultiply2 = 2 * interativeNodeXRelativeToLastNode;
var yMultiply2 = 2 * interativeNodeYRelativeToLastNode;
#endregion
// quadratic equation has solution
if (solutionOfQuadraticEquation >= 0)
{
var y1 = (-b + Math.Sqrt(solutionOfQuadraticEquation)) / aMultiply2;
var x1 = (sumFromSumFromSquareOfXAndSquareOfYAndDifferFromSquareOfD1AndSquareOfD2 - yMultiply2 * y1) / xMultiply2;
var y2 = (-b - Math.Sqrt(solutionOfQuadraticEquation)) / aMultiply2;
var x2 = (sumFromSumFromSquareOfXAndSquareOfYAndDifferFromSquareOfD1AndSquareOfD2 - yMultiply2 * y2) / xMultiply2;
var point1 = new Point(x1 + lastNode.X, y1 + lastNode.Y);
var point2 = new Point(x2 + lastNode.X, y2 + lastNode.Y);
var collisionWithPoint1 = false;
var collisionWithPoint2 = false;
// check collisions
for (var checkCollitionIndex = currentNodes.Count - 1; checkCollitionIndex >= 0; checkCollitionIndex--)
{
var node = currentNodes[checkCollitionIndex];
if (!collisionWithPoint1)
{
collisionWithPoint1 = CheckCollision(point1, node, newNode.Radius, bubbleGap);
}
if (!collisionWithPoint2)
{
collisionWithPoint2 = CheckCollision(point2, node, newNode.Radius, bubbleGap);
}
}
// no collisions
if (!collisionWithPoint1 && !collisionWithPoint2)
{
var point = new Point(interativeNode.X, interativeNode.Y);
var angleFromIntertiveNodeToPoint1 = CalculateAngle(point1, point);
var newBubbleAngle = CalculateAngle(new Point(lastNode.X, lastNode.Y), point);
// > 50 means it's clockwise
if (CheckAngleInRightHand(newBubbleAngle, Math.PI, angleFromIntertiveNodeToPoint1, initialAngle > 50))
{
AddNode(currentNodes, interativeNode, lastNode, newNode, point1);
IsNodeAdded = true;
break;
}
else
{
AddNode(currentNodes, interativeNode, lastNode, newNode, point2);
IsNodeAdded = true;
break;
}
}
else if (!collisionWithPoint1)
{
AddNode(currentNodes, interativeNode, lastNode, newNode, point1);
IsNodeAdded = true;
break;
}
else if (!collisionWithPoint2)
{
AddNode(currentNodes, interativeNode, lastNode, newNode, point2);
IsNodeAdded = true;
break;
}
}
}
if (IsNodeAdded)
{
break;
}
}
}