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Prevent crash on Y-axis autoscale when all trace values are identical

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This commit is contained in:
Jan Käberich 2020-11-27 16:53:41 +01:00
parent d81b8168ad
commit 6893af1386
1 changed files with 23 additions and 7 deletions
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30
Software/PC_Application/Traces/tracexyplot.cpp
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@ -462,6 +462,7 @@ void TraceXYPlot::updateAxisTicks()
};
auto createAutomaticTicks = [](vector<double>& ticks, double start, double stop, int minDivisions) -> double {
Q_ASSERT(stop > start);
ticks.clear();
double max_div_step = (stop - start) / minDivisions;
int zeros = floor(log10(max_div_step));
@ -561,13 +562,28 @@ void TraceXYPlot::updateAxisTicks()
}
}
}
// add 5% overrange
auto range = max - min;
min -= range * 0.05;
max += range * 0.05;
YAxis[i].rangeMin = min;
YAxis[i].rangeMax = max;
YAxis[i].rangeDiv = createAutomaticTicks(YAxis[i].ticks, min, max, 8);
if(max >= min) {
auto range = max - min;
if(range == 0.0) {
// this could happen if all values in a trace are identical (e.g. imported ideal touchstone files)
if(max == 0.0) {
// simply use +/-1 range
max = 1.0;
min = -1.0;
} else {
// +/-5% around value
max += abs(max * 0.05);
min -= abs(max * 0.05);
}
} else {
// add 5% of range at both ends
min -= range * 0.05;
max += range * 0.05;
}
YAxis[i].rangeMin = min;
YAxis[i].rangeMax = max;
YAxis[i].rangeDiv = createAutomaticTicks(YAxis[i].ticks, min, max, 8);
}
}
}
}