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Added cursors in waveform widget

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Auto unit string format function
This commit is contained in:
Furrtek
2017-10-28 16:34:52 +02:00
parent d47f292d3a
commit 90b76f00d9
7 changed files with 79 additions and 82 deletions
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firmware/application/string_format.cpp
+28
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@@ -170,3 +170,31 @@ std::string to_string_timestamp(const rtc::RTC& value) {
to_string_dec_uint(value.minute(), 2, '0') +
to_string_dec_uint(value.second(), 2, '0');
}
std::string unit_auto_scale(double n, const uint32_t base_nano, uint32_t precision) {
const uint32_t powers_of_ten[5] = { 1, 10, 100, 1000, 10000 };
std::string string { "" };
uint32_t prefix_index = base_nano;
double integer_part;
double fractional_part;
precision = std::min((uint32_t)4, precision);
while (n > 1000) {
n /= 1000.0;
prefix_index++;
}
fractional_part = modf(n, &integer_part) * powers_of_ten[precision];
if (fractional_part < 0)
fractional_part = -fractional_part;
string = to_string_dec_int(integer_part);
if (precision)
string += '.' + to_string_dec_uint(fractional_part, precision, '0');
if (prefix_index != 3)
string += unit_prefix[prefix_index];
return string;
}