/// <summary>
/// Check whether two labels overlap. Also calculate the horizontal and vertical offsets
/// to overcome the overlap.
/// </summary>
/// <param name="labelInfo">Information of the label</param>
/// <param name="verticalOffset">How much need to move vertically to overcome overlap</param>
/// <param name="horizontalOffset">How much need to move horizontally to overcome overlap</param>
/// <returns>OverlapTypes</returns>
private OverlapTypes CheckOverlap(CircularLabel label, out Double verticalOffset, out Double horizontalOffset)
{
OverlapTypes retValue = OverlapTypes.None; // Type of overlap
verticalOffset = 0; // How much need to move vertically to overcome overlap
horizontalOffset = 0; // How much need to move horizontally to overcome overlap
CircularLabel A = this;
CircularLabel B = label;
if (B.Position.Y > A.Position.Y)
{
if (B.Position.Y < A.Position.Y + A.Height)
{
// Calculate how much need to move vertically to overcome overlap
verticalOffset = A.Position.Y + A.Height - B.Position.Y;
retValue = OverlapTypes.Vertical;
}
}
else if (A.Position.Y > B.Position.Y)
{
if (A.Position.Y < B.Position.Y + B.Height)
{
// Calculate how much need to move vertically to overcome overlap
verticalOffset = B.Position.Y + B.Height - A.Position.Y;
retValue = OverlapTypes.Vertical;
}
}
if (B.Position.X > A.Position.X)
{
if (B.Position.X < A.Position.X + A.Width)
{
// Calculate how much need to move horizontally to overcome overlap
horizontalOffset = A.Position.X + A.Width - B.Position.X;
retValue = (retValue == OverlapTypes.Vertical) ? OverlapTypes.Both : OverlapTypes.Horizontal;
}
}
else if (A.Position.X > B.Position.X)
{
if (A.Position.X < B.Position.X + B.Width)
{
// Calculate how much need to move horizontally to overcome overlap
horizontalOffset = B.Position.X + B.Width - A.Position.X;
retValue = (retValue == OverlapTypes.Vertical) ? OverlapTypes.Both : OverlapTypes.Horizontal;
}
}
return(retValue);
}
/// <summary>
/// Ask for space to NextLabel if NextLabel can leave the space.
/// NextLabel B asks for space to the next label C.. and so on
/// </summary>
/// <param name="labelA">CircularLabel looking for space to overcome the overlap</param>
private static Boolean AskSpaceToNextLabel(CircularLabel label, Double requiredVerticalOffset, Int32 noOfIteration)
{
Boolean retValue = true;
Double gap = 0;
if (label.IsLast)
{
if (label.Position.Y + label.Height < label.Boundary.Height &&
label.Boundary.Height - (label.Position.Y + label.Height) > requiredVerticalOffset)
{
retValue = label.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Clockwise);
return(retValue);
}
else
{
return(false);
}
}
gap = VerticalSpcaeBetweenLabels(label, label.NextLabel);
if (gap > requiredVerticalOffset)
{
retValue = label.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Clockwise);
return(retValue);
}
else
{
retValue = AskSpaceToNextLabel(label.NextLabel, requiredVerticalOffset, noOfIteration);
if (retValue)
{
retValue = label.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Clockwise);
return(retValue);
}
else
{
retValue = false;
}
}
return(retValue);
}
/// <summary>
/// Ask for space to PreviusLabel B if it can leave the space inorder to overcome the overlap.
/// PreviusLabel B asks for space to the previous label C.. and so on
/// </summary>
/// <param name="labelA">CircularLabel looking for space to overcome the overlap</param>
private static Boolean AskSpaceToPreviusLabel(CircularLabel labelA, Double requiredVerticalOffset, Int32 noOfIteration)
{
Boolean retValue = true;
Double gap = 0;
if (labelA.IsFirst)
{
if (labelA.Position.Y > requiredVerticalOffset)
{
retValue = labelA.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Counterclockwise);
return(retValue);
}
else
{
return(false);
}
}
gap = VerticalSpcaeBetweenLabels(labelA, labelA.PreviusLabel);
if (gap > requiredVerticalOffset)
{
retValue = labelA.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Counterclockwise);
return(retValue);
}
else
{
retValue = AskSpaceToPreviusLabel(labelA.PreviusLabel, requiredVerticalOffset, noOfIteration);
if (retValue)
{
retValue = labelA.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Counterclockwise);
return(retValue);
}
else
{
retValue = false;
}
}
return(retValue);
}
/// <summary>
/// Calculate vertical space available between two CircularLabels
/// </summary>
/// <param name="label1">CircularLabel A</param>
/// <param name="label2">CircularLabel B</param>
/// <returns>vertical space available between two CircularLabels</returns>
private static Double VerticalSpcaeBetweenLabels(CircularLabel labelA, CircularLabel labelB)
{
Double gap = 0;
if (labelA.Position.Y < labelB.Position.Y)
{
gap = labelB.Position.Y - (labelA.Position.Y + labelA.Height);
}
else
{
gap = labelA.Position.Y - (labelB.Position.Y + labelB.Height);
}
if (gap < 0)
{
return(0);
}
else
{
return(gap);
}
}
/// <summary>
/// Position labels for Pie /Doughnut
/// </summary>
/// <param name="visual">Visual element</param>
/// <param name="totalSum">Total YValue sum from all dataPoints</param>
/// <param name="dataPoints">List of dataPoint</param>
/// <param name="labels">Dictionary of dataPoint labels</param>
/// <param name="pieSize">Pie size</param>
/// <param name="referenceEllipseSize">Reference ellipse size</param>
/// <param name="visualCanvasSize">Visual canvas size</param>
/// <param name="scaleY">Scale Y</param>
/// <param name="is3D">Whether a 3D chart</param>
private static void PositionLabels(Canvas visual, Double totalSum, List<DataPoint> dataPoints, Size pieSize, Size referenceEllipseSize, Size visualCanvasSize, Double scaleY, Boolean is3D)
{
//Point plotRadius;
Double xRadiusLabel = referenceEllipseSize.Width / 2;
Double yRadiusLabel = referenceEllipseSize.Height / 2;
Double xRadiusChart = pieSize.Width / 2;
Double yRadiusChart = pieSize.Height / 2;
Point center;
Chart chart = null;
//if(is3D)
// center = new Point(visualCanvasSize.Width / 2, visualCanvasSize.Height / 2 - (yRadiusChart * scaleY) / 2);
//else
center = new Point(visualCanvasSize.Width / 2, visualCanvasSize.Height / 2);
Double startAngle = FixAngle(dataPoints[0].Parent.InternalStartAngle), stopAngle, meanAngle;
//Graphics.DrawPointAt(center, visual, System.Windows.Media.Colors.Red);
CircularLabel prevousLabel = null;
CircularLabel cLabel = null;
Rect boundingArea = new Rect(0, 0, visual.Width, visual.Height);
// List of CircularLabels
List<CircularLabel> circularLabels = new List<CircularLabel>();
// Creating the LinkList of CircularLabels
foreach (DataPoint dp in dataPoints)
{
chart = dp.Chart as Chart;
stopAngle = startAngle + Math.PI * 2 * Math.Abs(dp.InternalYValue) / totalSum;
meanAngle = (startAngle + stopAngle) / 2;
if (dp.LabelStyle == LabelStyles.Inside)
{
meanAngle = CircularLabel.ResetMeanAngle(meanAngle);
PlaceLabelInside(dp, center, meanAngle, pieSize, referenceEllipseSize, scaleY, is3D);
startAngle = stopAngle;
continue;
}
// if (meanAngle > Math.PI * 2) meanAngle -= Math.PI * 2;
cLabel = new CircularLabel(dp.LabelVisual, center, meanAngle, xRadiusLabel, yRadiusLabel, xRadiusChart, yRadiusChart, visual);
cLabel.Boundary = boundingArea;
if (prevousLabel != null)
prevousLabel.NextLabel = cLabel;
cLabel.PreviusLabel = prevousLabel;
prevousLabel = cLabel;
circularLabels.Add(cLabel);
startAngle = stopAngle;
}
if (circularLabels.Count > 0)
{
circularLabels[0].PreviusLabel = cLabel;
cLabel.NextLabel = circularLabels[0];
LabelPlacementHelper.CircularLabelPlacment(boundingArea, circularLabels, (chart != null) ? chart.SmartLabelEnabled : false);
}
}
/// <summary>
/// Rearrange the labels vertically
/// </summary>
/// <param name="labels">List of CircularLabels</param>
/// <param name="leftOfArea">Left of the bounding area</param>
/// <param name="topOfArea">Top of the bounding area</param>
/// <param name="areaHeight">Height of the bounding area</param>
/// <param name="areaWidth">Width of the bounding area</param>
private static void RearrangeLabelsVertically(List <CircularLabel> labels, Double leftOfArea, Double topOfArea, Double areaHeight, Double areaWidth)
{
Rect[] labelInfo = new Rect[labels.Count];
int index = 0;
// Prepare label information into an array
foreach (CircularLabel label in labels)
{
Double left = (Double)label.LabelVisual.GetValue(Canvas.LeftProperty);
Double top = (Double)label.LabelVisual.GetValue(Canvas.TopProperty);
labelInfo[index++] = new Rect(left, top, label.LabelVisual.Width, label.LabelVisual.Height);
}
// Arrange the labels vertically
LabelPlacementHelper.VerticalLabelPlacement(new Rect(leftOfArea, topOfArea, areaWidth, areaHeight), ref labelInfo);
index = 0;
// Update position of the labels
foreach (CircularLabel label in labels)
{
Double top = labelInfo[index].Top + topOfArea;
Double left = labelInfo[index].Left;
Double currentMeanAngle = label.CalculateAngleByYCoordinate(top);
Double offset = 0;
if (!Double.IsNaN(currentMeanAngle))
{
currentMeanAngle = CircularLabel.ResetMeanAngle(currentMeanAngle);
label.Position = label.GetCartesianCoordinates4Labels(currentMeanAngle);
if (left < label.Center.X)
{
left = label.Center.X - (label.Position.X - label.Center.X);
//left = areaWidth - label.Position.X - label.LabelVisual.Width;
//left = areaWidth - label.Position.X - (label.Center.X - left) + label.LabelVisual.Width;
//left = label.Center.X - (label.Position.X - label.Center.X) - label.LabelVisual.Width;
}
else
{
left = label.Position.X;
}
label.CurrentMeanAngle = currentMeanAngle;
}
// Move the labels towards left or right if space availlable
//if ((label.BaseMeanAngle > 7 * Math.PI / 4 && label.BaseMeanAngle < Math.PI / 4
// || label.BaseMeanAngle > 3 * Math.PI / 2 && label.BaseMeanAngle < 5 * Math.PI / 4)
if (top > (label.YRadiusLabel * 2) / 6 && top < 5 * (label.YRadiusLabel * 2) / 6)
{
if (left < label.Center.X)
{
Double x = left - label.LabelVisual.Width;
if (x > 0)
{
offset = -x / 3;
}
}
else
{
Double x = areaWidth - (left + label.LabelVisual.Width);
if (x > 0)
{
offset = +x / 3;
}
}
}
label.Position = new Point(left + offset, top);
label.UpdateLabelVisualPosition();
//label.LabelVisual.SetValue(Canvas.LeftProperty, left); // );
//label.LabelVisual.SetValue(Canvas.TopProperty, top);
index++;
}
}
/// <summary>
/// Check whether two labels overlap. Also calculate the horizontal and vertical offsets
/// to overcome the overlap.
/// </summary>
/// <param name="labelInfo">Information of the label</param>
/// <param name="verticalOffset">How much need to move vertically to overcome overlap</param>
/// <param name="horizontalOffset">How much need to move horizontally to overcome overlap</param>
/// <returns>OverlapTypes</returns>
private OverlapTypes CheckOverlap(CircularLabel label, out Double verticalOffset, out Double horizontalOffset)
{
OverlapTypes retValue = OverlapTypes.None; // Type of overlap
verticalOffset = 0; // How much need to move vertically to overcome overlap
horizontalOffset = 0; // How much need to move horizontally to overcome overlap
CircularLabel A = this;
CircularLabel B = label;
if (B.Position.Y > A.Position.Y)
{
if (B.Position.Y < A.Position.Y + A.Height)
{
// Calculate how much need to move vertically to overcome overlap
verticalOffset = A.Position.Y + A.Height - B.Position.Y;
retValue = OverlapTypes.Vertical;
}
}
else if (A.Position.Y > B.Position.Y)
{
if (A.Position.Y < B.Position.Y + B.Height)
{
// Calculate how much need to move vertically to overcome overlap
verticalOffset = B.Position.Y + B.Height - A.Position.Y;
retValue = OverlapTypes.Vertical;
}
}
if (B.Position.X > A.Position.X)
{
if (B.Position.X < A.Position.X + A.Width)
{
// Calculate how much need to move horizontally to overcome overlap
horizontalOffset = A.Position.X + A.Width - B.Position.X;
retValue = (retValue == OverlapTypes.Vertical) ? OverlapTypes.Both : OverlapTypes.Horizontal;
}
}
else if (A.Position.X > B.Position.X)
{
if (A.Position.X < B.Position.X + B.Width)
{
// Calculate how much need to move horizontally to overcome overlap
horizontalOffset = B.Position.X + B.Width - A.Position.X;
retValue = (retValue == OverlapTypes.Vertical) ? OverlapTypes.Both : OverlapTypes.Horizontal;
}
}
return retValue;
}
/// <summary>
/// Calculate vertical space available between two CircularLabels
/// </summary>
/// <param name="label1">CircularLabel A</param>
/// <param name="label2">CircularLabel B</param>
/// <returns>vertical space available between two CircularLabels</returns>
private static Double VerticalSpcaeBetweenLabels(CircularLabel labelA, CircularLabel labelB)
{
Double gap = 0;
if (labelA.Position.Y < labelB.Position.Y)
gap = labelB.Position.Y - (labelA.Position.Y + labelA.Height);
else
gap = labelA.Position.Y - (labelB.Position.Y + labelB.Height);
if (gap < 0)
return 0;
else
return gap;
}
/// <summary>
/// Ask for space to PreviusLabel B if it can leave the space inorder to overcome the overlap.
/// PreviusLabel B asks for space to the previous label C.. and so on
/// </summary>
/// <param name="labelA">CircularLabel looking for space to overcome the overlap</param>
private static Boolean AskSpaceToPreviusLabel(CircularLabel labelA, Double requiredVerticalOffset, Int32 noOfIteration)
{
Boolean retValue = true;
Double gap = 0;
if (labelA.IsFirst)
{
if (labelA.Position.Y > requiredVerticalOffset)
{
retValue = labelA.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Counterclockwise);
return retValue;
}
else
return false;
}
gap = VerticalSpcaeBetweenLabels(labelA, labelA.PreviusLabel);
if (gap > requiredVerticalOffset)
{
retValue =labelA.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Counterclockwise);
return retValue;
}
else
{
retValue = AskSpaceToPreviusLabel(labelA.PreviusLabel, requiredVerticalOffset, noOfIteration);
if (retValue)
{
retValue = labelA.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Counterclockwise);
return retValue;
}
else
retValue = false;
}
return retValue;
}
/// <summary>
/// Ask for space to NextLabel if NextLabel can leave the space.
/// NextLabel B asks for space to the next label C.. and so on
/// </summary>
/// <param name="labelA">CircularLabel looking for space to overcome the overlap</param>
private static Boolean AskSpaceToNextLabel(CircularLabel label, Double requiredVerticalOffset, Int32 noOfIteration)
{
Boolean retValue = true;
Double gap = 0;
if (label.IsLast)
{
if (label.Position.Y + label.Height < label.Boundary.Height &&
label.Boundary.Height - (label.Position.Y + label.Height) > requiredVerticalOffset)
{
retValue = label.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Clockwise);
return retValue;
}
else
return false;
}
gap = VerticalSpcaeBetweenLabels(label, label.NextLabel);
if (gap > requiredVerticalOffset)
{
retValue = label.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Clockwise);
return retValue;
}
else
{
retValue = AskSpaceToNextLabel(label.NextLabel, requiredVerticalOffset, noOfIteration);
if (retValue)
{
retValue = label.RotateByVerticalOffset(requiredVerticalOffset, SweepDirection.Clockwise);
return retValue;
}
else
retValue = false;
}
return retValue;
}
