/// <summary>
/// Select a reasonable base 10 logarithmic axis scale given a range of data values.
/// </summary>
/// <remarks>
/// This method only applies to <see cref="AxisType.Log"/> type axes, and it
/// is called by the general <see cref="PickScale"/> method. The scale range is chosen
/// based always on powers of 10 (full log cycles). This
/// method honors the <see cref="Scale.MinAuto"/>, <see cref="Scale.MaxAuto"/>,
/// and <see cref="Scale.MajorStepAuto"/> autorange settings.
/// In the event that any of the autorange settings are false, the
/// corresponding <see cref="Scale.Min"/>, <see cref="Scale.Max"/>, or <see cref="Scale.MajorStep"/>
/// setting is explicitly honored, and the remaining autorange settings (if any) will
/// be calculated to accomodate the non-autoranged values. For log axes, the MinorStep
/// value is not used.
/// <para>On Exit:</para>
/// <para><see cref="Scale.Min"/> is set to scale minimum (if <see cref="Scale.MinAuto"/> = true)</para>
/// <para><see cref="Scale.Max"/> is set to scale maximum (if <see cref="Scale.MaxAuto"/> = true)</para>
/// <para><see cref="Scale.MajorStep"/> is set to scale step size (if <see cref="Scale.MajorStepAuto"/> = true)</para>
/// <para><see cref="Scale.Mag"/> is set to a magnitude multiplier according to the data</para>
/// <para><see cref="Scale.Format"/> is set to the display format for the values (this controls the
/// number of decimal places, whether there are thousands separators, currency types, etc.)</para>
/// </remarks>
/// <param name="pane">A reference to the <see cref="GraphPane"/> object
/// associated with this <see cref="Axis"/></param>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <seealso cref="PickScale"/>
/// <seealso cref="AxisType.Log"/>
public override void PickScale( GraphPane pane, IGraphics g, float scaleFactor )
{
double minVal = _rangeMin;
double maxVal = _rangeMax;
// Make sure that minVal and maxVal are legitimate values
if (Double.IsInfinity(minVal) || Double.IsNaN(minVal) || minVal == Double.MaxValue)
minVal = 0.0;
if (Double.IsInfinity(maxVal) || Double.IsNaN(maxVal) || maxVal == Double.MaxValue)
maxVal = 0.0;
if(minVal > maxVal)
{
double t = maxVal;
maxVal = minVal;
minVal = t;
}
// Check for bad data range
if (minVal <= 0.0 && maxVal <= 0.0)
{
minVal = 1.0;
maxVal = 10.0;
}
else if (minVal <= 0.0)
{
minVal = maxVal / 10.0;
}
double range = maxVal - minVal;
// For autoranged values, assign the value. If appropriate, adjust the value by the
// "Grace" value.
if(_minAuto)
{
if(_minGrace < 0)
{
_minGrace = 0;
}
double graceVal = CalcMinValue(minVal, maxVal, _minGrace);
double nextProperPowerOf10 = Math.Pow(10.0, Math.Floor(Math.Log10(minVal)));
_min = graceVal < nextProperPowerOf10 ? nextProperPowerOf10 : graceVal; // don't use grace val if there is a power of 10 between the data start and the garce value
}
if(_maxAuto)
{
if(_maxGrace < 0)
{
_maxGrace = 0;
}
double graceVal = CalcMaxValue(minVal, maxVal, _maxGrace);
double nextProperPowerOf10 = Math.Pow(10.0, Math.Ceiling(Math.Log10(maxVal)));
_max = graceVal > nextProperPowerOf10 ? nextProperPowerOf10 : graceVal;
}
// if min == max and we are auto scaling, make the scale go from -5% to +5%
if (_max == _min && _maxAuto && _minAuto)
{
if (Math.Abs(_max) > 1e-100)
{
_max *= (_min < 0 ? 0.95 : 1.05);
_min *= (_min < 0 ? 1.05 : 0.95);
}
else
{
_max = 1.0;
_min = -1.0;
}
}
_mag = 0; // Never use a magnitude shift for log scales
//this.numDec = 0; // The number of decimal places to display is not used
// Test for trivial condition of range = 0 and pick a suitable default
if ( _max - _min < SmallestValue )
{
if ( _maxAuto )
_max = _max * 2.0;
if ( _minAuto )
_min = _min / 2.0;
}
if(UsingLinearlySpacedTickMarks) // this method gets called again after the initial setup - so _linScale may already be set
{
//_linScale.PickScale(pane, g, scaleFactor);
_min = _linScale._min;
_max = _linScale._max;
return;
}
int nTicks = CalcNumTics(); // get the number of ticks
if (UseMostSuitableTickMarkSpacing && nTicks < MinimumNumberOfMajorTicks) // then we shall use a linear scale instead
{
// Calculate the new step size
double majorStep = _majorStep;
if (_majorStepAuto)
{
double targetSteps = (_ownerAxis is XAxis || _ownerAxis is X2Axis) ? Default.TargetXSteps : Default.TargetYSteps;
// Calculate the step size based on target steps
majorStep = CalcStepSize(_max - _min, targetSteps);
if (_isPreventLabelOverlap)
{
// Calculate the maximum number of labels
double maxLabels = (double)this.CalcMaxLabels(g, pane, scaleFactor); // Will this work?
if (maxLabels < (_max - _min) / _majorStep)
{
majorStep = CalcBoundedStepSize(_max - _min, maxLabels);
}
}
}
LinearScale altLinScale = new LinearScale(this, _ownerAxis)
{
_rangeMin = this._rangeMin,
_rangeMax = this._rangeMax,
MajorStep = majorStep,
_min = this._min,
_max = this._max
};
// Special case. If range is zero, then we have already adjusted our _min and max to 95% to 105%.
// I do not want the linear scale to adda a grace on to this as well.
if(range == 0)
{
altLinScale._minGrace = 0;
altLinScale._maxGrace = 0;
}
_linScale = altLinScale;
return;
}
// Majorstep is always 1 for log scales
if (_majorStepAuto)
_majorStep = 1.0;
}
/// <summary>
/// Select a reasonable base 10 logarithmic axis scale given a range of data values.
/// </summary>
/// <remarks>
/// This method only applies to <see cref="AxisType.Log"/> type axes, and it
/// is called by the general <see cref="PickScale"/> method. The scale range is chosen
/// based always on powers of 10 (full log cycles). This
/// method honors the <see cref="Scale.MinAuto"/>, <see cref="Scale.MaxAuto"/>,
/// and <see cref="Scale.MajorStepAuto"/> autorange settings.
/// In the event that any of the autorange settings are false, the
/// corresponding <see cref="Scale.Min"/>, <see cref="Scale.Max"/>, or <see cref="Scale.MajorStep"/>
/// setting is explicitly honored, and the remaining autorange settings (if any) will
/// be calculated to accomodate the non-autoranged values. For log axes, the MinorStep
/// value is not used.
/// <para>On Exit:</para>
/// <para><see cref="Scale.Min"/> is set to scale minimum (if <see cref="Scale.MinAuto"/> = true)</para>
/// <para><see cref="Scale.Max"/> is set to scale maximum (if <see cref="Scale.MaxAuto"/> = true)</para>
/// <para><see cref="Scale.MajorStep"/> is set to scale step size (if <see cref="Scale.MajorStepAuto"/> = true)</para>
/// <para><see cref="Scale.Mag"/> is set to a magnitude multiplier according to the data</para>
/// <para><see cref="Scale.Format"/> is set to the display format for the values (this controls the
/// number of decimal places, whether there are thousands separators, currency types, etc.)</para>
/// </remarks>
/// <param name="pane">A reference to the <see cref="GraphPane"/> object
/// associated with this <see cref="Axis"/></param>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <seealso cref="PickScale"/>
/// <seealso cref="AxisType.Log"/>
override public void PickScale(GraphPane pane, IGraphics g, float scaleFactor)
{
double minVal = _rangeMin;
double maxVal = _rangeMax;
// Make sure that minVal and maxVal are legitimate values
if (Double.IsInfinity(minVal) || Double.IsNaN(minVal) || minVal == Double.MaxValue)
{
minVal = 0.0;
}
if (Double.IsInfinity(maxVal) || Double.IsNaN(maxVal) || maxVal == Double.MaxValue)
{
maxVal = 0.0;
}
if (minVal > maxVal)
{
double t = maxVal;
maxVal = minVal;
minVal = t;
}
// Check for bad data range
if (minVal <= 0.0 && maxVal <= 0.0)
{
minVal = 1.0;
maxVal = 10.0;
}
else if (minVal <= 0.0)
{
minVal = maxVal / 10.0;
}
double range = maxVal - minVal;
// For autoranged values, assign the value. If appropriate, adjust the value by the
// "Grace" value.
if (_minAuto)
{
if (_minGrace < 0)
{
_minGrace = 0;
}
double graceVal = CalcMinValue(minVal, maxVal, _minGrace);
double nextProperPowerOf10 = Math.Pow(10.0, Math.Floor(Math.Log10(minVal)));
_min = graceVal < nextProperPowerOf10 ? nextProperPowerOf10 : graceVal; // don't use grace val if there is a power of 10 between the data start and the garce value
}
if (_maxAuto)
{
if (_maxGrace < 0)
{
_maxGrace = 0;
}
double graceVal = CalcMaxValue(minVal, maxVal, _maxGrace);
double nextProperPowerOf10 = Math.Pow(10.0, Math.Ceiling(Math.Log10(maxVal)));
_max = graceVal > nextProperPowerOf10 ? nextProperPowerOf10 : graceVal;
}
// if min == max and we are auto scaling, make the scale go from -5% to +5%
if (_max == _min && _maxAuto && _minAuto)
{
if (Math.Abs(_max) > 1e-100)
{
_max *= (_min < 0 ? 0.95 : 1.05);
_min *= (_min < 0 ? 1.05 : 0.95);
}
else
{
_max = 1.0;
_min = -1.0;
}
}
_mag = 0; // Never use a magnitude shift for log scales
//this.numDec = 0; // The number of decimal places to display is not used
// Test for trivial condition of range = 0 and pick a suitable default
if (_max - _min < 1.0e-20)
{
if (_maxAuto)
{
_max = _max * 2.0;
}
if (_minAuto)
{
_min = _min / 2.0;
}
}
if (UsingLinearlySpacedTickMarks) // this method gets called again after the initial setup - so _linScale may already be set
{
//_linScale.PickScale(pane, g, scaleFactor);
_min = _linScale._min;
_max = _linScale._max;
return;
}
int nTicks = CalcNumTics(); // get the number of ticks
if (UseMostSuitableTickMarkSpacing && nTicks < MinimumNumberOfMajorTicks) // then we shall use a linear scale instead
{
// Calculate the new step size
double majorStep = _majorStep;
if (_majorStepAuto)
{
double targetSteps = (_ownerAxis is XAxis || _ownerAxis is X2Axis) ? Default.TargetXSteps : Default.TargetYSteps;
// Calculate the step size based on target steps
majorStep = CalcStepSize(_max - _min, targetSteps);
if (_isPreventLabelOverlap)
{
// Calculate the maximum number of labels
double maxLabels = (double)this.CalcMaxLabels(g, pane, scaleFactor); // Will this work?
if (maxLabels < (_max - _min) / _majorStep)
{
majorStep = CalcBoundedStepSize(_max - _min, maxLabels);
}
}
}
LinearScale altLinScale = new LinearScale(this, _ownerAxis)
{
_rangeMin = this._rangeMin,
_rangeMax = this._rangeMax,
MajorStep = majorStep,
_min = this._min,
_max = this._max
};
// Special case. If range is zero, then we have already adjusted our _min and max to 95% to 105%.
// I do not want the linear scale to adda a grace on to this as well.
if (range == 0)
{
altLinScale._minGrace = 0;
altLinScale._maxGrace = 0;
}
_linScale = altLinScale;
return;
}
// Majorstep is always 1 for log scales
if (_majorStepAuto)
{
_majorStep = 1.0;
}
}