public override void InternalMouseMove(MouseEventArgs objArg)
{
if (m_Rect.Contains(objArg.X, objArg.Y) && _ChartHotPoints != null)
{
MicroChartHotPoint newHotPoint = MicroChartHotPoint.Empty;
Rectangle chartBounds = new Rectangle(_ChartLocation.X, _ChartLocation.Y, _ChartWidth, _ChartHeight);
if (chartBounds.Contains(objArg.X, objArg.Y))
{
foreach (MicroChartHotPoint point in _ChartHotPoints)
{
Point chartPoint = new Point(objArg.X - _ChartLocation.X, objArg.Y - _ChartLocation.Y);
Rectangle r = point.HotPointBounds;
Rectangle sliceBounds = point.ChartSliceBounds;
r.Offset(_ChartLocation);
if (!sliceBounds.IsEmpty)
sliceBounds.Offset(_ChartLocation);
if (_ChartType == eMicroChartType.Pie && PieSliceContains(chartPoint, point) ||
_ChartType != eMicroChartType.Pie && (r.Contains(objArg.X, objArg.Y) || sliceBounds.Contains(objArg.X, objArg.Y)))
{
newHotPoint = point;
break;
}
}
}
HotPoint = newHotPoint;
}
base.InternalMouseMove(objArg);
}
private bool PieSliceContains(Point point, MicroChartHotPoint hotPoint)
{
int diameter = Math.Min(_ChartHeight, _ChartWidth);
double a = diameter / 2 + (_ChartWidth - diameter) / 2;
double b = diameter / 2 + (_ChartHeight - diameter) / 2; ;
double x = point.X - a;
double y = point.Y - b;
double angle = Math.Atan2(y, x);
if (angle < 0)
angle += 2 * Math.PI;
double angleDegrees = angle * 180 / Math.PI;
// point is inside the pie slice only if between start and end angle
if (angleDegrees >= hotPoint.StartAngle &&
angleDegrees <= hotPoint.StartAngle + hotPoint.SweepAngle)
{
return true;
}
return false;
}
public override void InternalMouseLeave()
{
HotPoint = MicroChartHotPoint.Empty;
if (_IsMouseOver)
{
_IsMouseOver = false;
this.Refresh();
}
base.InternalMouseLeave();
}