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(svn r21747) -Fix [FS#4395]: the diagonal iterator would iterate twice over some tiles (fonsinchen)

This commit is contained in:
rubidium 2011-01-09 14:55:22 +00:00
parent 35be634974
commit ade2f29f5d
1 changed files with 11 additions and 4 deletions
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15
src/tilearea.cpp
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@ -139,15 +139,22 @@ TileIterator &DiagonalTileIterator::operator++()
{
assert(this->tile != INVALID_TILE);
bool new_line = false;
do {
/* Iterate using the rotated coordinates. */
if (this->a_max > 0) {
++this->a_cur;
this->a_cur += 2;
new_line = this->a_cur >= this->a_max;
} else {
--this->a_cur;
this->a_cur -= 2;
new_line = this->a_cur <= this->a_max;
}
if (this->a_cur == this->a_max) {
this->a_cur = 0;
if (new_line) {
/* offset of initial a_cur: one tile in the same direction as a_max
* every second line.
*/
this->a_cur = abs(this->a_cur) % 2 ? 0 : (this->a_max > 0 ? 1 : -1);
if (this->b_max > 0) {
++this->b_cur;
} else {