/// <summary>
/// Go through each <see cref="CurveItem"/> object in the collection,
/// calling the <see cref="PointPairList.GetRange"/> member to
/// determine the minimum and maximum values in the
/// <see cref="CurveItem.Points"/> list of data value pairs. If the curves include
/// a stack bar, handle within the current GetRange method. In the event that no
/// data are available, a default range of min=0.0 and max=1.0 are returned.
/// If the Y axis has a valid data range and the Y2 axis not, then the Y2
/// range will be a duplicate of the Y range. Vice-versa for the Y2 axis
/// having valid data when the Y axis does not.
/// If any <see cref="CurveItem"/> in the list has a missing
/// <see cref="PointPairList"/>, a new empty one will be generated.
/// </summary>
/// <param name="xMinVal">The minimun X value in the data range for all curves
/// in this collection</param>
/// <param name="xMaxVal">The maximun X value in the data range for all curves
/// in this collection</param>
/// <param name="yMinVal">The minimun Y (left Y axis) value in the data range
/// for all curves in this collection</param>
/// <param name="yMaxVal">The maximun Y (left Y axis) value in the data range
/// for all curves in this collection</param>
/// <param name="y2MinVal">The minimun Y2 (right Y axis) value in the data range
/// for all curves in this collection</param>
/// <param name="y2MaxVal">The maximun Y2 (right Y axis) value in the data range
/// for all curves in this collection</param>
/// <param name="bIgnoreInitial">ignoreInitial is a boolean value that
/// affects the data range that is considered for the automatic scale
/// ranging (see <see cref="GraphPane.IsIgnoreInitial"/>). If true, then initial
/// data points where the Y value is zero are not included when
/// automatically determining the scale <see cref="Axis.Min"/>,
/// <see cref="Axis.Max"/>, and <see cref="Axis.Step"/> size. All data after
/// the first non-zero Y value are included.
/// </param>
/// <param name="pane">
/// A reference to the <see cref="GraphPane"/> object that is the parent or
/// owner of this object.
/// </param>
public void GetRange(out double xMinVal, out double xMaxVal,
out double yMinVal, out double yMaxVal,
out double y2MinVal, out double y2MaxVal,
bool bIgnoreInitial, GraphPane pane)
{
double tXMinVal,
tXMaxVal,
tYMinVal,
tYMaxVal;
// initialize the values to outrageous ones to start
xMinVal = yMinVal = y2MinVal = tXMinVal = tYMinVal = Double.MaxValue;
xMaxVal = yMaxVal = y2MaxVal = tXMaxVal = tYMaxVal = Double.MinValue;
maxPts = 1;
PointPairList sumList = null;
// Loop over each curve in the collection and examine any that are not a stack bar
foreach (CurveItem curve in this)
{
if (curve.IsBar && pane.BarType == BarType.Stack)
{
if (sumList == null)
{
sumList = (PointPairList)curve.Points.Clone();
}
else if (pane.BarBase == BarBase.X)
{
sumList.SumY(curve.Points);
}
else
{
sumList.SumX(curve.Points);
}
sumList.GetRange(ref tXMinVal, ref tXMaxVal,
ref tYMinVal, ref tYMaxVal, bIgnoreInitial,
false, true);
}
else
{
// Call the GetRange() member function for the current
// curve to get the min and max values
curve.GetRange(ref tXMinVal, ref tXMaxVal,
ref tYMinVal, ref tYMaxVal, bIgnoreInitial, pane);
}
bool isYOrd = ((pane.Y2Axis.IsOrdinal || pane.Y2Axis.IsText) && curve.IsY2Axis) ||
((pane.YAxis.IsOrdinal || pane.YAxis.IsText) && !curve.IsY2Axis);
bool isXOrd = pane.XAxis.IsOrdinal || pane.XAxis.IsText;
// For ordinal Axes, the data range is just 1 to Npts
if (isYOrd)
{
tYMinVal = 1.0;
tYMaxVal = curve.NPts;
}
if (isXOrd)
{
tXMinVal = 1.0;
tXMaxVal = curve.NPts;
}
// Bar types always include the Y=0 value
if (curve.IsBar)
{
if (pane.BarBase == BarBase.X)
{
if (tYMinVal > 0)
{
tYMinVal = 0;
}
else if (tYMaxVal < 0)
{
tYMaxVal = 0;
}
if (!isXOrd)
{
tXMinVal -= pane.ClusterScaleWidth / 2.0;
tXMaxVal += pane.ClusterScaleWidth / 2.0;
}
}
else
{
if (tXMinVal > 0)
{
tXMinVal = 0;
}
else if (tXMaxVal < 0)
{
tXMaxVal = 0;
}
if (!isYOrd)
{
tYMinVal -= pane.ClusterScaleWidth / 2.0;
tYMaxVal += pane.ClusterScaleWidth / 2.0;
}
}
}
// determine which curve has the maximum number of points
if (curve.NPts > maxPts)
{
maxPts = curve.NPts;
}
// If the min and/or max values from the current curve
// are the absolute min and/or max, then save the values
// Also, differentiate between Y and Y2 values
if (curve.IsY2Axis)
{
if (tYMinVal < y2MinVal)
{
y2MinVal = tYMinVal;
}
if (tYMaxVal > y2MaxVal)
{
y2MaxVal = tYMaxVal;
}
}
else
{
if (tYMinVal < yMinVal)
{
yMinVal = tYMinVal;
}
if (tYMaxVal > yMaxVal)
{
yMaxVal = tYMaxVal;
}
}
if (tXMinVal < xMinVal)
{
xMinVal = tXMinVal;
}
if (tXMaxVal > xMaxVal)
{
xMaxVal = tXMaxVal;
}
}
// Define suitable default ranges in the event that
// no data were available
if (xMinVal >= Double.MaxValue || xMaxVal <= Double.MinValue)
{
xMinVal = 0;
xMaxVal = 1;
}
if (yMinVal >= Double.MaxValue || yMaxVal <= Double.MinValue)
{
if (y2MinVal < Double.MaxValue && y2MaxVal > Double.MinValue)
{
yMinVal = y2MinVal;
yMaxVal = y2MaxVal;
}
else
{
yMinVal = 0;
yMaxVal = 1;
}
}
if (y2MinVal >= Double.MaxValue || y2MaxVal <= Double.MinValue)
{
if (yMinVal < Double.MaxValue && yMaxVal > Double.MinValue)
{
y2MinVal = yMinVal;
y2MaxVal = yMaxVal;
}
else
{
y2MinVal = 0;
y2MaxVal = 1;
}
}
//check for single values which may be larger than the totals, because totals have been
// reduced by negative values. If any are found, adjust max/min values accordingly rpk
if (pane.BarType == BarType.Stack)
{
foreach (CurveItem curve in this)
{
if (curve.IsBar)
{
curve.Points.GetRange(ref tXMinVal, ref tXMaxVal,
ref tYMinVal, ref tYMaxVal, bIgnoreInitial, false, true);
if (curve.IsY2Axis)
{
if (tYMinVal < y2MinVal)
{
y2MinVal = tYMinVal;
}
if (tYMaxVal > y2MaxVal)
{
y2MaxVal = tYMaxVal;
}
}
else
{
if (tYMinVal < yMinVal)
{
yMinVal = tYMinVal;
}
if (tYMaxVal > yMaxVal)
{
yMaxVal = tYMaxVal;
}
}
if (tXMinVal < xMinVal)
{
xMinVal = tXMinVal;
}
if (tXMaxVal > xMaxVal)
{
xMaxVal = tXMaxVal;
}
}
}
}
//create reasonable min/max values for bartype = percentStack
bool hasNegative = false;
if (pane.BarType == BarType.PercentStack)
{
foreach (CurveItem curve in this)
{
if (curve.IsBar)
{
foreach (PointPair point in curve.Points)
{
if (point.X < 0 || point.Y < 0)
{
hasNegative = true;
if (pane.BarBase == BarBase.X)
{
yMinVal = -100;
yMaxVal = 100;
}
else
{
xMinVal = -100;
xMaxVal = 100;
}
break;
}
}
}
if (hasNegative)
{
break;
}
}
if (!hasNegative)
{
if (pane.BarBase == BarBase.X)
{
yMinVal = 0;
yMaxVal = 100;
}
else
{
xMinVal = 0;
xMaxVal = 100;
}
}
}
}