構成 | |
struct | LabelInfo |
関数 | |
qreal | expt (qreal a, int n) |
function for similar to pow(3) but cares about round-off error. | |
qreal | nicenum (qreal x, int round) |
find a nice number for auto-calculating a grid interval. |
qreal anonymous_namespace{map_grid.cpp}::expt | ( | qreal | a, | |
int | n | |||
) |
function for similar to pow(3) but cares about round-off error.
Code by Paul S. Heckbert.
qreal anonymous_namespace{map_grid.cpp}::nicenum | ( | qreal | x, | |
int | round | |||
) |
find a nice number for auto-calculating a grid interval.
Algorithm from `Graphics Gems' (ISBN 0-12-286166-3) `Nice Numbers for Graph Labels' by Paul S. Heckbert