diff options
Diffstat (limited to 'core/math/math_funcs.cpp')
| -rw-r--r-- | core/math/math_funcs.cpp | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/core/math/math_funcs.cpp b/core/math/math_funcs.cpp index 0fbd031214..64615fe6b4 100644 --- a/core/math/math_funcs.cpp +++ b/core/math/math_funcs.cpp @@ -206,25 +206,29 @@ double Math::ceil(double p_x) { return ::ceil(p_x); } -int Math::decimals(double p_step) { - - int max=4; - double llimit = Math::pow(0.1,max); - double ulimit = 1.0-llimit; - int i=0; - while( max) { - - float d = absf(p_step) - Math::floor(absf(p_step)); +int Math::step_decimals(double p_step) { + + static const int maxn=9; + static const double sd[maxn]={ + 0.9999, // somehow compensate for floating point error + 0.09999, + 0.009999, + 0.0009999, + 0.00009999, + 0.000009999, + 0.0000009999, + 0.00000009999, + 0.000000009999 + }; - if (d<llimit || d>ulimit) - break; - p_step*=10.0; - max--; - i++; + double as=absf(p_step); + for(int i=0;i<maxn;i++) { + if (as>=sd[i]) { + return i; + } } - return i; - + return maxn; } double Math::ease(double p_x, double p_c) { |