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add some documentation

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git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@265 57a11ea4-9604-0410-9ed3-97b8803252fd
This commit is contained in:
Linas Vepstas 1997-12-04 07:37:30 +00:00
parent 69b1881a43
commit a61e6c7d2b
1 changed files with 17 additions and 1 deletions
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18
src/RegWindow.c
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@ -759,7 +759,23 @@ regRecalculateBalance( RegWindow *regData )
is_credit = xaccIsAccountInList (credit_acc, regData -> blackacc );
is_debit = xaccIsAccountInList (debit_acc, regData -> blackacc );
/* increment and/or decrement the running balance as appropriate */
/* Increment and/or decrement the running balance as appropriate.
* Naively, if there were no stock transactions (or at least,
* transactions that recorded only a price), we could simply get
* the amount, and add that to the balance. However, price
* transactions, where only a price is specified, and the share
* amount is zero, makes this a tricky proposition. A large
* number of price transactions interspersed with buy/sell makes
* this an even trickier calculation. The easiest thing to do
* is to indirectly derive transaction values from the previously
* computed balances. Thus, the running balance.
*
* Note, however, that this algorithm will provide confusing
* results unless all transactions are absolutely ordered.
* That is, date order is not enough, if several transactions
* occur on the same date: they MUST be completely disambiguated
* and absolutely ordered.
*/
if (is_credit) {
tmp = xaccGetBalance (credit_acc, trans);
dbalance -= credit_acc -> running_balance;