Impala Documentation

double Impala::Application::MediaTable::BarPlot::findStep	(	double	min,
		double	max,
		double &	newMin,
		double &	newMax
	)			`[inline, private]`

Definition at line 309 of file BarPlot.h.

Referenced by Impala::Application::TagsLife::BarPlot::AddColumnsFromDataSource(), AddColumnsFromDataSource(), Impala::Application::TagsLife::BarPlot::findStep(), and findStep().

00309                                                                             {
00310         double range = max - min;
00311         if(range < 0) range *= -1;
00312         double exponent = floor(log10(range));
00313         double coefficient = range/pow(10, exponent);
00314 
00315         double step = 1;
00316         if(coefficient <= 5) {
00317                 step = 0.5;
00318                 if(coefficient <= 2.5) {
00319                         step = 0.25;
00320                         if(coefficient == 1) step = 0.1;
00321                 }
00322         }
00323 
00324         step *= pow(10, exponent);
00325         if(step == 2.5) step = 2;
00326 
00327         newMin = floor(min/step)*step;
00328         newMax = ceil(max/step)*step;
00329 
00330         if(min > max) return -step;
00331         return step;
00332     }