/// <summary>
/// Place the Label at x, y.
/// </summary>
/// <param name="x">X position</param>
/// <param name="y">Y position</param>
public void UpdateLabelVisualPosition()
{
Double x = Position.X, y = Position.Y;
// For left side labels line should target to the right handside of the label
if (x < Center.X)
{
if (x - LabelVisual.Width < 0)
{
x = 0;
}
else
{
x = x - LabelVisual.Width;
}
}
// if (y + LabelVisual.Height > YRadiusLabel * 2)
// y = YRadiusLabel * 2 - LabelVisual.Height;
// if (y < 0)
// y = 0;
// Set the position
LabelVisual.SetValue(Canvas.LeftProperty, x);
LabelVisual.SetValue(Canvas.TopProperty, y);
}
public Boolean CheckOutOfBounds()
{
//Point position = GetCartesianCoordinates4Labels(BaseMeanAngle);
//if (BaseMeanAngle >= 7 * Math.PI / 4 && BaseMeanAngle <= 0 || BaseMeanAngle >= 0 && BaseMeanAngle <= Math.PI / 4
// || BaseMeanAngle >= 3 * Math.PI / 4 && BaseMeanAngle <= 5 * Math.PI / 4)
//{
// if (Math.Abs(position.X - Position.X) > XRadiusLabel)
// return true;
// if (Math.Abs(position.Y - Position.Y) > YRadiusLabel)
// return true;
//}
//else
//{
// if (Math.Abs(BaseMeanAngle - ResetMeanAngle(CurrentMeanAngle)) > Math.PI / 4)
// return true;
//}
Double left = (Double)LabelVisual.GetValue(Canvas.LeftProperty);
Double top = (Double)LabelVisual.GetValue(Canvas.TopProperty);
Double labelLinePointX, labelLinePointY;
if (left < Center.X)
{
labelLinePointX = left + Width + LabelPlacementHelper.LABEL_LINE_GAP;
}
else
{
labelLinePointX = left - LabelPlacementHelper.LABEL_LINE_GAP;
}
labelLinePointY = top + Height / 2;
Point pointOverPie = GetCartesianCoordinates4Chart(BaseMeanAngle);
Point labelLinePoint = new Point(labelLinePointX, labelLinePointY);
Point intersectionPoint = Graphics.IntersectingPointOfTwoLines(Center, labelLinePoint, pointOverPie, new Point(labelLinePoint.X, Center.Y));
Double b = Graphics.DistanceBetweenTwoPoints(Center, intersectionPoint);
Double angle = Math.Atan(b / XRadiusChart);
angle = Math.PI / 2 - angle;
if (angle > Math.PI / 2)
{
return(true);
}
// Graphics.DrawPointAt(labelLinePoint, Visual, Colors.Red);
return(false);
}
protected override VisualGroup CreateVisual(IRenderContext context, ILabel label)
{
var layout = label.GetLayout();
// don't render invisible labels
if (layout.Width < 0 || layout.Height < 0)
{
return(null);
}
var group = new LabelVisual();
group.Size = layout.GetSize();
// Draw the label background as a rounded rectangle
var gp = CreatePath(layout);
var pathVisual = new GeneralPathVisual(gp)
{
Brush = pathBrush, Pen = Pens.SkyBlue
};
group.Add(pathVisual);
// Draw the label's text
if (context.Zoom >= buttonZoomThreshold)
{
// draw the action button
group.Add(CreateButton(layout));
group.Add(new TextVisual {
Text = label.Text, Font = Font, Brush = Brushes.Black, Location = PointD.Origin
});
}
else
{
group.Add(new TextVisual {
Text = label.Text,
Font = Font,
Brush = Brushes.Black,
Location = new PointD((buttonWidth + 2 * inset) * 0.5, 0)
});
}
// convert to convenient coordinate space
group.Transform = GetTransform(context, layout, true);
return(group);
}