///<summary>sets default values. For when all category values = 0</summary>
void SetEmptyDefaultValues()
{
List <float> emptyValues = MathScientific.RepeatedList(0.1f, graph.sliceLabels.Count);
graph.sliceValues.SetList(emptyValues);
emptyDefaultValuesOn = true;
}
///<summary>sets all values to zero and sets given value. Called when first value added.</summary>
void SetInitialValues(int index, float firstValue)
{
List <float> initialValues = MathScientific.RepeatedList(0f, graph.sliceLabels.Count);
initialValues[index] = firstValue;
graph.sliceValues.SetList(initialValues);
emptyDefaultValuesOn = false;
}