* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "util.h"
+#include "util.hpp"
#include <extdef.h>
#include <assert.h>
+#include <algorithm>
+
#include <QTextStream>
#include <QDebug>
namespace pv {
namespace util {
-static const QString SIPrefixes[9] =
- {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
-const int FirstSIPrefixPower = -15;
+static const QString SIPrefixes[17] =
+ {"y", "z", "a", "f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G",
+ "T", "P", "E", "Z", "Y"};
+const int FirstSIPrefix = 8;
+const int FirstSIPrefixPower = -(FirstSIPrefix * 3);
+const double MinTimeDelta = 1e-15; // Anything below 1 fs can be considered zero
-QString format_time(double t, unsigned int prefix,
+QString format_si_value(double v, QString unit, int prefix,
unsigned int precision, bool sign)
{
- assert(prefix < countof(SIPrefixes));
+ if (prefix < 0) {
+ int exp = -FirstSIPrefixPower;
+
+ prefix = 0;
+ while ((fabs(v) * pow(10.0, exp)) > 999.0 &&
+ prefix < (int)(countof(SIPrefixes) - 1)) {
+ prefix++;
+ exp -= 3;
+ }
+ }
+
+ assert(prefix >= 0);
+ assert(prefix < (int)countof(SIPrefixes));
const double multiplier = pow(10.0,
(int)- prefix * 3 - FirstSIPrefixPower);
QString s;
QTextStream ts(&s);
- if (sign) {
+ if (sign)
ts << forcesign;
- }
- ts << fixed << qSetRealNumberPrecision(precision)
- << (t * multiplier) << SIPrefixes[prefix] << "s";
+ ts << fixed << qSetRealNumberPrecision(precision) <<
+ (v * multiplier) << " " << SIPrefixes[prefix] << unit;
return s;
}
-QString format_second(double second)
+static QString pad_number(unsigned int number, int length)
{
- unsigned int i = 0;
- int exp = - FirstSIPrefixPower;
+ return QString("%1").arg(number, length, 10, QChar('0'));
+}
+
+static QString format_time_in_full(double t, signed precision, bool force_sign)
+{
+ const unsigned int whole_seconds = abs((int) t);
+ const unsigned int days = whole_seconds / (60 * 60 * 24);
+ const unsigned int hours = (whole_seconds / (60 * 60)) % 24;
+ const unsigned int minutes = (whole_seconds / 60) % 60;
+ const unsigned int seconds = whole_seconds % 60;
+
+ QString s;
+ QTextStream ts(&s);
+
+ if (force_sign && (t >= 0))
+ ts << "+";
+ if (t < 0)
+ ts << "-";
+
+ bool use_padding = false;
- while ((second * pow(10.0, exp)) > 999.0 && i < countof(SIPrefixes) - 1) {
- i++;
- exp -= 3;
+ if (days) {
+ ts << days << ":";
+ use_padding = true;
}
- return format_time(second, i, 0, false);
+ if (hours || days) {
+ ts << pad_number(hours, use_padding ? 2 : 0) << ":";
+ use_padding = true;
+ }
+
+ if (minutes || hours || days) {
+ ts << pad_number(minutes, use_padding ? 2 : 0);
+ use_padding = true;
+
+ // We're not showing any seconds with a negative precision
+ if (precision >= 0)
+ ts << ":";
+ }
+
+ // precision < 0: Use DD:HH:MM format
+ // precision = 0: Use DD:HH:MM:SS format
+ // precision > 0: Use DD:HH:MM:SS.mmm nnn ppp fff format
+ if (precision >= 0) {
+ ts << pad_number(seconds, use_padding ? 2 : 0);
+
+ const double fraction = fabs(t) - whole_seconds;
+
+ if (precision > 0 && precision < 1000) {
+ QString fs = QString("%1").arg(fraction, -(2 + precision), 'f',
+ precision, QChar('0'));
+
+ ts << ".";
+
+ // Copy all digits, inserting spaces as unit separators
+ for (int i = 1; i <= precision; i++) {
+ // Start at index 2 to skip the "0." at the beginning
+ ts << fs[1 + i];
+
+ if ((i > 0) && (i % 3 == 0))
+ ts << " ";
+ }
+ }
+ }
+
+ return s;
+}
+
+static QString format_time_with_si(double t, QString unit, int prefix,
+ unsigned int precision, bool sign)
+{
+ // The precision is always given without taking the prefix into account
+ // so we need to deduct the number of decimals the prefix might imply
+ const int prefix_order =
+ -(prefix * 3 + pv::util::FirstSIPrefixPower);
+
+ const unsigned int relative_prec =
+ (prefix >= pv::util::FirstSIPrefix) ? precision :
+ std::max((int)(precision - prefix_order), 0);
+
+ return format_si_value(t, unit, prefix, relative_prec, sign);
+}
+
+QString format_time(double t, int prefix, TimeUnit unit,
+ unsigned int precision, double step_size, bool sign)
+{
+ // Make 0 appear as 0, not random +0 or -0
+ if (fabs(t) < MinTimeDelta)
+ return "0";
+
+ // If we have to use samples then we have no alternative formats
+ if (unit == Samples)
+ return format_time_with_si(t, "sa", prefix, precision, sign);
+
+ // View zoomed way out -> low precision (0), high step size (>=60s)
+ // -> DD:HH:MM
+ if ((precision == 0) && (step_size >= 60))
+ return format_time_in_full(t, -1, sign);
+
+ // View in "normal" range -> medium precision, medium step size
+ // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds
+ // View zoomed way in -> high precision (>3), low step size (<1s)
+ // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds
+ if (abs(t) < 60)
+ return format_time_with_si(t, "s", prefix, precision, sign);
+ else
+ return format_time_in_full(t, precision, sign);
+}
+
+QString format_second(double second)
+{
+ return format_si_value(second, "s", -1, 0, false);
}
} // namespace util
projects / pulseview.git / blobdiff