/// <summary>
/// Scales the value used to determine the size of the Bubble.
/// </summary>
/// <param name="graph">The Chart Graphics object</param>
/// <param name="common">The Common elements object</param>
/// <param name="area">Chart area for this chart</param>
/// <param name="value">Value to scale.</param>
/// <returns>Scaled values.</returns>
private float ScaleBubbleSize(ChartGraphics graph, CommonElements common, ChartArea area, double value)
{
// Check if scaling numbers are detected
if (!_scaleDetected)
{
// Try to find bubble size scale in the custom series properties
_minAll = double.MaxValue;
_maxAll = double.MinValue;
foreach (Series ser in common.DataManager.Series)
{
if (String.Compare(ser.ChartTypeName, Name, true, System.Globalization.CultureInfo.CurrentCulture) == 0 &&
ser.ChartArea == area.Name &&
ser.IsVisible())
{
// Check if custom properties are set to specify scale
if (ser.IsCustomPropertySet(CustomPropertyName.BubbleScaleMin))
{
_minAll = Math.Min(_minAll, CommonElements.ParseDouble(ser[CustomPropertyName.BubbleScaleMin]));
}
if (ser.IsCustomPropertySet(CustomPropertyName.BubbleScaleMax))
{
_maxAll = Math.Max(_maxAll, CommonElements.ParseDouble(ser[CustomPropertyName.BubbleScaleMax]));
}
// Check if attribute for max. size is set
if (ser.IsCustomPropertySet(CustomPropertyName.BubbleMaxSize))
{
_maxPossibleBubbleSize = CommonElements.ParseDouble(ser[CustomPropertyName.BubbleMaxSize]);
if (_maxPossibleBubbleSize < 0 || _maxPossibleBubbleSize > 100)
{
throw(new ArgumentException(SR.ExceptionCustomAttributeIsNotInRange0to100("BubbleMaxSize")));
}
}
// Check if attribute for min. size is set
if (ser.IsCustomPropertySet(CustomPropertyName.BubbleMinSize))
{
_minPossibleBubbleSize = CommonElements.ParseDouble(ser[CustomPropertyName.BubbleMinSize]);
if (_minPossibleBubbleSize < 0 || _minPossibleBubbleSize > 100)
{
throw(new ArgumentException(SR.ExceptionCustomAttributeIsNotInRange0to100("BubbleMinSize")));
}
}
// Check if custom properties set to use second Y value (bubble size) as label text
labelYValueIndex = 0;
if (ser.IsCustomPropertySet(CustomPropertyName.BubbleUseSKSizeorLabel) && String.Compare(ser[CustomPropertyName.BubbleUseSKSizeorLabel], "true", StringComparison.OrdinalIgnoreCase) == 0)
{
labelYValueIndex = 1;
break;
}
}
}
// Scale values are not specified - auto detect
if (_minAll == double.MaxValue || _maxAll == double.MinValue)
{
double minSer = double.MaxValue;
double maxSer = double.MinValue;
foreach (Series ser in common.DataManager.Series)
{
if (ser.ChartTypeName == Name && ser.ChartArea == area.Name && ser.IsVisible())
{
foreach (DataPoint point in ser.Points)
{
if (!point.IsEmpty)
{
// Check required Y values number
if (point.YValues.Length < YValuesPerPoint)
{
throw (new InvalidOperationException(SR.ExceptionChartTypeRequiresYValues(Name, YValuesPerPoint.ToString(CultureInfo.InvariantCulture))));
}
minSer = Math.Min(minSer, point.YValues[1]);
maxSer = Math.Max(maxSer, point.YValues[1]);
}
}
}
}
if (_minAll == double.MaxValue)
{
_minAll = minSer;
}
if (_maxAll == double.MinValue)
{
_maxAll = maxSer;
}
}
// Calculate maximum bubble size
SKSize areaSize = graph.GetAbsoluteSize(area.PlotAreaPosition.Size);
_maxBubleSize = (float)(Math.Min(areaSize.Width, areaSize.Height) / (100.0 / _maxPossibleBubbleSize));
_minBubleSize = (float)(Math.Min(areaSize.Width, areaSize.Height) / (100.0 / _minPossibleBubbleSize));
// Calculate scaling variables depending on the Min/Max values
if (_maxAll == _minAll)
{
_valueScale = 1;
_valueDiff = _minAll - (_maxBubleSize - _minBubleSize) / 2f;
}
else
{
_valueScale = (_maxBubleSize - _minBubleSize) / (_maxAll - _minAll);
_valueDiff = _minAll;
}
_scaleDetected = true;
}
// Check if value do not exceed Min&Max
if (value > _maxAll)
{
return(0F);
}
if (value < _minAll)
{
return(0F);
}
// Return scaled value
return((float)((value - _valueDiff) * _valueScale) + _minBubleSize);
}