private static void UpdateIndicator(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var newState = e.NewValue as IndicatorState;
if (newState == null) // unknown type has been passed
return;
var state = new IndicatorState
{
IsError = newState.IsError,
IsMemory = newState.IsMemory,
Value = newState.Value,
MantissaLength = newState.MantissaLength
};
ProcessState(state);
}
private static void ProcessState(IndicatorState state)
{
_memory.Visibility = state.IsMemory ? Visibility.Visible : Visibility.Hidden;
_minus.Visibility = state.Value < 0 ? Visibility.Visible : Visibility.Hidden;
_error.Visibility = state.IsError ? Visibility.Visible : Visibility.Hidden;
var val = Math.Abs((float) Math.Round(state.Value, 7));
var intval = (int) val;
if (intval > 99999999)
{
_error.Visibility = Visibility.Visible;
return;
}
var rawLeft = (int) val;
var lPow = rawLeft != 0 ? (int) (Math.Log10(rawLeft)) + 1 : 1;
int rPow;
for (rPow = 0; rPow < 7; rPow++)
{
var floated = Math.Round(val*Math.Pow(10, rPow), 1);
var inted = (int) (Math.Round(val*Math.Pow(10, rPow), 1));
if (Math.Abs(floated - inted) < 0.1)
break;
}
if (lPow + rPow > 8)
rPow = 8 - lPow;
var rawRight = (int) (Math.Round(val - rawLeft, rPow)*Math.Pow(10, rPow));
rPow += state.MantissaLength;
for (var k = 0; k < state.MantissaLength; k++)
rawRight = rawRight*10;
//compute first digit position
var first = 8 - lPow - rPow;
//display integer part
var dp = 0;
for (var i = 0; i < 8 - rPow; i++)
{
var segment = _digits[i];
if (i < first)
segment.Clear();
else
{
var digit = (int) (rawLeft/Math.Pow(10, lPow - dp - 1));
rawLeft -= (int) (digit*Math.Pow(10, lPow - dp - 1));
segment.Display(digit, dp == lPow - 1);
dp++;
}
}
//display fraction
dp = 0;
for (var i = first + lPow; i < 8; i++)
{
var segment = _digits[i];
var digit = (int) (rawRight/Math.Pow(10, rPow - dp - 1));
rawRight -= (int) (digit*Math.Pow(10, rPow - dp - 1));
segment.Display(digit, false);
dp++;
}
}