unsigned int
sp_svg_number_write_de (gchar *buf, double val, unsigned int tprec, unsigned int padf)
{
if ((val == 0.0) || ((fabs (val) >= 0.1) && (fabs(val) < 10000000))) {
return sp_svg_number_write_d (buf, val, tprec, 0, padf);
} else {
double eval;
int p;
eval = floor (log10 (fabs (val)));
val = val / pow (10.0, eval);
p = sp_svg_number_write_d (buf, val, tprec, 0, padf);
buf[p++] = 'e';
p += sp_svg_number_write_i (buf + p, (int) eval);
return p;
}
}
unsigned int
sp_svg_number_write_d (gchar *buf, double val, unsigned int tprec, unsigned int fprec, unsigned int padf)
{
double dival, fval;
int idigits, ival, i;
i = 0;
/* Process sign */
if (val < 0.0) {
buf[i++] = '-';
val = fabs (val);
}
/* Determine number of integral digits */
if (val >= 1.0) {
idigits = (int) floor (log10 (val));
} else {
idigits = 0;
}
/* Determine the actual number of fractional digits */
fprec = MAX (fprec, tprec - idigits);
/* Round value */
val += 0.5 * pow (10.0, - ((double) fprec));
/* Extract integral and fractional parts */
dival = floor (val);
ival = (int) dival;
fval = val - dival;
/* Write integra */
i += sp_svg_number_write_i (buf + i, ival);
if ((fprec > 0) && (padf || (fval > 0.0))) {
buf[i++] = '.';
while ((fprec > 0) && (padf || (fval > 0.0))) {
fval *= 10.0;
dival = floor (fval);
fval -= dival;
buf[i++] = '0' + (int) dival;
fprec -= 1;
}
}
buf[i] = 0;
return i;
}
unsigned int sp_svg_number_write_de(gchar *buf, int bufLen, double val, unsigned int tprec, int min_exp)
{
int eval = (int)floor(log10(fabs(val)));
if (val == 0.0 || eval < min_exp) {
return sp_svg_number_write_ui(buf, 0);
}
unsigned int maxnumdigitsWithoutExp = // This doesn't include the sign because it is included in either representation
eval<0?tprec+(unsigned int)-eval+1:
eval+1<(int)tprec?tprec+1:
(unsigned int)eval+1;
unsigned int maxnumdigitsWithExp = tprec + ( eval<0 ? 4 : 3 ); // It's not necessary to take larger exponents into account, because then maxnumdigitsWithoutExp is DEFINITELY larger
if (maxnumdigitsWithoutExp <= maxnumdigitsWithExp) {
return sp_svg_number_write_d(buf, bufLen, val, tprec, 0);
} else {
val = eval < 0 ? val * pow(10.0, -eval) : val / pow(10.0, eval);
int p = sp_svg_number_write_d(buf, bufLen, val, tprec, 0);
buf[p++] = 'e';
p += sp_svg_number_write_i(buf + p, bufLen - p, eval);
return p;
}
}
