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handle possible DST change within FloorTime() #568

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handle possible DST change within FloorTime() #568

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7ec8f1c
handle possible DST change within FloorTime()
shrddr May 11, 2024
13d2746
adjust major time ticks ±1 hour on DST change
shrddr May 11, 2024
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14 changes: 13 additions & 1 deletion implot.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1036,6 +1036,7 @@ ImPlotTime FloorTime(const ImPlotTime& t, ImPlotTimeUnit unit) {
case ImPlotTimeUnit_Min: gp.Tm.tm_sec = 0; break;
default: return t;
}
if (unit >= ImPlotTimeUnit_Day) gp.Tm.tm_isdst = -1;
return MkTime(&gp.Tm);
}

Expand Down Expand Up @@ -1253,9 +1254,20 @@ void Locator_Time(ImPlotTicker& ticker, const ImPlotRange& range, float pixels,
const int step = GetTimeStep(minor_per_major, unit0);
// generate ticks
ImPlotTime t1 = FloorTime(ImPlotTime::FromDouble(range.Min), unit1);
ImPlotContext& gp = *GImPlot;
GetTime(t1, &gp.Tm);
int prev_major_is_dst = gp.Tm.tm_isdst;
while (t1 < t_max) {
// get next major
const ImPlotTime t2 = AddTime(t1, unit1, 1);
ImPlotTime t2 = AddTime(t1, unit1, 1);
if (GetStyle().UseLocalTime && (unit1 == ImPlotTimeUnit_Day || unit1 == ImPlotTimeUnit_Mo)) {
GetTime(t2, &gp.Tm);
if (prev_major_is_dst == 0 && gp.Tm.tm_isdst == 1) // local clock adjusted ahead, current day/month is shorter
t2 = AddTime(t2, ImPlotTimeUnit_Hr, -1);
if (prev_major_is_dst == 1 && gp.Tm.tm_isdst == 0) // local clock adjusted back, current day/month is longer
t2 = AddTime(t2, ImPlotTimeUnit_Hr, 1);
prev_major_is_dst = gp.Tm.tm_isdst;
}
// add major tick
if (t1 >= t_min && t1 <= t_max) {
// minor level 0 tick
Expand Down