OrderTotal Rounding

[AndreiMaz]

Would be nice to have the ability to configure OrderTotal rounding.
Eg. in Sweden decimals (ören/cents) are not used anymore, and when using discount codes with percentage, the order total get decimals.

i want the order totals (only) to look like this:
Sub-total: 10,00
Tax 2,50

Rounding: 0,50

Total: 13,00

See discussion at http://www.nopcommerce.com/boards/t/41958/suggestion-ordertotal-rounding.aspx (waiting for reply)

and https://en.wikipedia.org/wiki/Cash_rounding

See related work item - #677

Contribution: #1983 and #1992

[mfalkao]

My I suggest a slightly different implementation.
Instead of using the suggested RoundingType it would be sufficient to state the precision as decimal (like 0.01, 0.05, 0.5) and a rounding type that states midpoint rounding (to even, AwayFromZero).

Rounding could then be implemented as:
v: the value to round
p: precision as decimal
m: midpoint rounding

q = Math.Truncate(v/p);
r = Math.Round(v/p - q, m);
result = (q + r) * p;

Furthermore, I would suggest to have two rounding settings per currency. One for Price and one for Amount. Additionally, there might be the need to have a separate rounding scheme for order total only.

[skoshelev]

Closed #1424