private void RecalculateTimeScale()
{
//Lets do the calculation for all of the possible time scales and see which one fits bets
if(_bAutomaticTimeScale)
{
int iSize = (this.Orientation == enumOrientation.orHorizontal) ? Width : Height;
int iOptimumScale = iSize/10;
double dblZoomFactor = CalculateZoomFactor(iSize, enumTimeScale.MilliSeconds);
int iMilliScale = DefaultScale(dblZoomFactor) / DefaultMajorInterval();
int iMilliDiff = Math.Abs(iOptimumScale - iMilliScale);
dblZoomFactor = CalculateZoomFactor(iSize, enumTimeScale.Seconds);
int iSecScale = DefaultScale(dblZoomFactor) / DefaultMajorInterval();
int iSecDiff = Math.Abs(iOptimumScale - iSecScale);
dblZoomFactor = CalculateZoomFactor(iSize, enumTimeScale.Minutes);
int iMinScale = DefaultScale(dblZoomFactor) / DefaultMajorInterval();
int iMinDiff = Math.Abs(iOptimumScale - iMinScale);
dblZoomFactor = CalculateZoomFactor(iSize, enumTimeScale.Hours);
int iHourScale = DefaultScale(dblZoomFactor) / DefaultMajorInterval();
int iHourDiff = Math.Abs(iOptimumScale - iHourScale);
if( (iSecDiff < iMilliDiff) && (iSecDiff < iMinDiff) && (iSecDiff < iHourDiff) )
_TimeScale = enumTimeScale.Seconds;
else if( (iMinDiff < iMilliDiff) && (iMinDiff < iSecDiff) && (iMinDiff < iHourDiff) )
_TimeScale = enumTimeScale.Minutes;
else if( (iHourDiff < iMilliDiff) && (iHourDiff < iSecDiff) && (iHourDiff < iMinDiff) )
_TimeScale = enumTimeScale.Hours;
else
_TimeScale = enumTimeScale.MilliSeconds;
RecalculateZoom();
RecalculateDivisions();
}
}
private string GetTimeScaleAbbreviation(enumTimeScale timeScale)
{
string strText="";
switch(timeScale)
{
case enumTimeScale.MilliSeconds:
strText = "(ms)";
break;
case enumTimeScale.Seconds:
strText = "(s)";
break;
case enumTimeScale.Minutes:
strText = "(m)";
break;
case enumTimeScale.Hours:
strText = "(h)";
break;
}
return strText;
}
private double CalculateZoomFactor(int iSize, enumTimeScale timeScale)
{
double dblZoomFactor = ((float) iSize / (float) ((float) (_lEndMillisecond - _lStartMillisecond)/GetMillisecondScale(timeScale)));
if(dblZoomFactor > 10000) dblZoomFactor = 10000;
if(dblZoomFactor < 0.00001) dblZoomFactor = 0.00001;
return dblZoomFactor;
}
private int GetMillisecondScale(enumTimeScale timeScale)
{
int iScale = 1;
switch(timeScale)
{
case enumTimeScale.MilliSeconds:
iScale = 1;
break;
case enumTimeScale.Seconds:
iScale = 1000;
break;
case enumTimeScale.Minutes:
iScale = 60000;
break;
case enumTimeScale.Hours:
iScale = 3600000;
break;
}
return iScale;
}
