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use a better method for finding the precision to use for float buttons, about 4x faster to calculate and will show for eg, 0.0108 rather than 0.01, but 0.0100001 still displays as 0.01.

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This commit is contained in:
Campbell Barton 2011-06-09 07:40:30 +00:00
parent 252f7c9af8
commit 152b06dc82
1 changed files with 33 additions and 18 deletions
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45
source/blender/editors/interface/interface.c
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@ -74,6 +74,9 @@
#define MENU_ITEM_HEIGHT 20
#define MENU_SEP_HEIGHT 6
#define PRECISION_FLOAT_MAX 7
#define PRECISION_FLOAT_MAX_POW 10000000 /* pow(10, PRECISION_FLOAT_MAX) */
/*
* a full doc with API notes can be found in bf-blender/trunk/blender/doc/guides/interface_API.txt
*
@ -463,27 +466,39 @@ static int ui_but_float_precision(uiBut *but, double value)
* _but_, this is only for small values si 10.0001 will not get
* the same treatment */
if(value != 0.0 && (value= ABS(value)) < 0.1) {
double prec_d= -(log10(value));
double prec_d_floor = floor(prec_d + FLT_EPSILON);
int test_prec= (int)prec_d_floor;
/* this check is so 0.00016 from isnt rounded to 0.0001 */
if(prec_d - prec_d_floor > FLT_EPSILON) { /* not ending with a .0~001 */
/* check if a second decimal place is needed 0.00015 for eg. */
if(double_round(value, test_prec + 1) - double_round(value, test_prec + 2) != 0.0) {
test_prec += 2;
}
else {
test_prec += 1;
int value_i= (int)((value * PRECISION_FLOAT_MAX_POW) + 0.5);
if(value_i != 0) {
const int prec_span= 3; /* show: 0.01001, 5 would allow 0.0100001 for eg. */
int test_prec;
int prec_min= -1;
int dec_flag= 0;
int i= PRECISION_FLOAT_MAX;
while(i && value_i) {
if(value_i % 10) {
dec_flag |= 1<<i;
prec_min= i;
}
value_i /= 10;
i--;
}
if(test_prec > prec && test_prec <= 7) {
/* even though its a small value, if the second last digit is not 0, use it */
test_prec = prec_min;
dec_flag= (dec_flag >> (prec_min + 1)) & ((1 << prec_span) - 1);
while(dec_flag) {
test_prec++;
dec_flag = dec_flag >> 1;
}
if(test_prec > prec) {
prec= test_prec;
}
}
}
CLAMP(prec, 1, 7);
CLAMP(prec, 1, PRECISION_FLOAT_MAX);
return prec;
}
@ -1484,7 +1499,7 @@ static void ui_get_but_string_unit(uiBut *but, char *str, int len_max, double va
if(scene->unit.scale_length<0.0001f) scene->unit.scale_length= 1.0f; // XXX do_versions
/* Sanity checks */
if(precision>7) precision= 7;
if(precision > PRECISION_FLOAT_MAX) precision= PRECISION_FLOAT_MAX;
else if(precision==0) precision= 2;
bUnit_AsString(str, len_max, ui_get_but_scale_unit(but, value), precision, scene->unit.system, unit_type>>16, do_split, pad);