internal ValueGrid( GridRange gr, double low, double up, ValueAxisUnit vAxis, double basevalue )
{
double grLower = Double.MaxValue;
double grUpper = Double.MinValue;
if ( gr != null )
{
this.rigid = gr.Rigid;
grLower = gr.LowerValue;
grUpper = gr.UpperValue;
}
this.lower = low;
this.upper = up;
this.vAxis = vAxis;
this.baseValue = basevalue;
// Fill in the scale values
double tmp = 1;
for (int i = 1; i < 7; i++)
{
tmp *= baseValue;
scaleValues[6 - i] = tmp;
}
tmp = 1;
for (int i = 7; i < scaleValues.Length; i++)
{
tmp *= baseValue;
scaleValues[i] = ( 1 / tmp );
}
// Set an appropriate value axis it not given yet
SetValueAxis();
if ( !rigid )
{
this.lower = ( lower == grLower ? grLower : this.vAxis.GetNiceLower( lower ) );
this.upper = ( upper == grUpper ? grUpper : this.vAxis.GetNiceHigher( upper ) );
}
}
/// <summary>
///
/// </summary>
/// <param name="gridStep"></param>
/// <param name="labelStep"></param>
public void SetValueAxis( double gridStep, double labelStep )
{
vAxis = new ValueAxisUnit( gridStep, labelStep );
}
private void SetValueAxis()
{
if ( vAxis != null )
return;
if ( upper == Double.NaN || upper == Double.MinValue || upper == Double.MaxValue )
upper = 0.9;
if ( lower == Double.NaN || lower == Double.MaxValue || lower == Double.MinValue )
lower = 0;
if ( !rigid && upper == 0 && upper == lower )
upper = 0.9;
// Determine nice axis grid
double shifted = Math.Abs(upper - lower);
if ( shifted == 0 ) // Special case, no 'range' available
shifted = upper;
// Find the scaled unit for this range
double mod = 1.0;
int scaleIndex = scaleValues.Length - 1;
while ( scaleIndex >= 0 && scaleValues[scaleIndex] < shifted )
scaleIndex--;
// Keep the rest of division
shifted = shifted / scaleValues[++scaleIndex];
// While rest > 10, divide by 10
while ( shifted > 10.0 )
{
shifted /= 10;
mod *= 10;
}
while ( shifted < 1.0 )
{
shifted *= 10;
mod /= 10;
}
// Create nice grid based on 'fixed' ranges
if ( shifted <= 1.5 )
vAxis = new ValueAxisUnit( 0.1 * mod * scaleValues[scaleIndex], 0.5 * mod * scaleValues[scaleIndex] );
else if ( shifted <= 3 )
vAxis = new ValueAxisUnit( 0.2 * mod * scaleValues[scaleIndex], 1.0 * mod * scaleValues[scaleIndex] );
else if ( shifted <= 5 )
vAxis = new ValueAxisUnit( 0.5 * mod * scaleValues[scaleIndex], 1.0 * mod * scaleValues[scaleIndex] );
else
vAxis = new ValueAxisUnit( 0.5 * mod * scaleValues[scaleIndex], 2.0 * mod * scaleValues[scaleIndex]);
}