private EquationCollection generate_equations()
{
EquationCollection result = new EquationCollection();
foreach (int term_left in LeftRange.Values)
{
foreach (int term_right in RightRange.Values)
{
if (Operation == OperationEnum.Division)
{
if (term_left % term_right != 0)
{
continue;
}
}
int term_result = 0;
switch (Operation)
{
case OperationEnum.Addition: term_result = term_left + term_right; break;
case OperationEnum.Substraction: term_result = term_left - term_right; break;
case OperationEnum.Multiplication: term_result = term_left * term_right; break;
case OperationEnum.Division: term_result = term_left / term_right; break;
}
if (ResultRange.Includes(term_result))
{
Equation eq = new Equation(term_left, Operation, term_right, term_result);
result.Add(eq);
}
}
}
return(result);
}
private void re_build_selection()
{
EquationCollection result = new EquationCollection(Solutions);
if (Selection_Randomized)
{
for (int i = 0; i < result.Count; i++)
{
int i0 = randomizer.Next(result.Count);
int i1 = randomizer.Next(result.Count);
if (i0 != i1)
{
Equation e = result[i0];
result[i0] = result[i1];
result[i1] = e;
}
}
}
if (Selection_Limit < result.Count)
{
result = new EquationCollection(result.Take(Selection_Limit));
}
Selection = result;
}
public EquationGenerator(Range left_range,
OperationEnum op,
Range right_range,
Range result_range)
{
LeftRange = left_range;
RightRange = right_range;
ResultRange = result_range;
Operation = op;
Solutions = generate_equations();
ElipsisPosition = ElipsisPositionEnum.Result;
re_build_selection();
}
