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Antenna length Calculator fix

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Calculation now rounds up decimals so result is more accurate.
This commit is contained in:
euquiq 2020-06-13 21:21:32 -03:00
parent 7fba40172f
commit 46c076c296
2 changed files with 27 additions and 7 deletions
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31
firmware/application/apps/ui_whipcalc.cpp
View File

@ -36,8 +36,18 @@ void WhipCalcView::focus() {
field_frequency.focus(); field_frequency.focus();
} }
double ui::WhipCalcView::get_decimals(double num, int16_t mult, bool round) {
num -= int(num); //keep decimals only
num *= mult; //Shift decimals into integers
if (!round) return num;
int16_t intnum = int(num); //Round it up if necessary
num -= intnum; //Get decimal part
if (num > .5) intnum++; //Round up
return intnum;
}
void WhipCalcView::update_result() { void WhipCalcView::update_result() {
double length, divider; double length, calclength, divider;
divider = ((double)options_type.selected_index_value() / 8.0); divider = ((double)options_type.selected_index_value() / 8.0);
@ -45,8 +55,12 @@ void WhipCalcView::update_result() {
length = (speed_of_light_mps / (double)field_frequency.value()) * divider; length = (speed_of_light_mps / (double)field_frequency.value()) * divider;
auto m = to_string_dec_int((int)length, 2); auto m = to_string_dec_int((int)length, 2);
auto cm = to_string_dec_int(int(length * 100.0) % 100, 2); /* auto cm = to_string_dec_int(int(length * 100.0) % 100, 2);
auto mm = to_string_dec_int(int(length * 1000.0) % 10, 1); auto mm = to_string_dec_int(int(length * 1000.0) % 10, 1); */
calclength = get_decimals(length,100); //cm
auto cm = to_string_dec_int(int(calclength), 2);
auto mm = to_string_dec_int(int(get_decimals(calclength,10,true)), 1);
text_result_metric.set(m + "m " + cm + "." + mm + "cm"); text_result_metric.set(m + "m " + cm + "." + mm + "cm");
@ -60,11 +74,16 @@ void WhipCalcView::update_result() {
} }
// Imperial // Imperial
length = (speed_of_light_fps / (double)field_frequency.value()) * divider; calclength = (speed_of_light_fps / (double)field_frequency.value()) * divider;
auto feet = to_string_dec_int((int)length, 3); /* auto feet = to_string_dec_int((int)length, 3);
auto inch = to_string_dec_int(int(length * 10.0) % 12, 2); auto inch = to_string_dec_int(int(length * 10.0) % 12, 2);
auto inch_c = to_string_dec_int(int(length * 100.0) % 10, 1); auto inch_c = to_string_dec_int(int(length * 100.0) % 10, 1); */
auto feet = to_string_dec_int(int(calclength), 3);
calclength = get_decimals(calclength,12); //inches
auto inch = to_string_dec_int(int(calclength), 2);
auto inch_c = to_string_dec_int(int(get_decimals(calclength,10,true)), 1);
text_result_imperial.set(feet + "ft " + inch + "." + inch_c + "in"); text_result_imperial.set(feet + "ft " + inch + "." + inch_c + "in");
} }

3
firmware/application/apps/ui_whipcalc.hpp
View File

@ -37,7 +37,7 @@ public:
void focus() override; void focus() override;
std::string title() const override { return "Whip calculator"; }; std::string title() const override { return "Antenna length"; };
private: private:
const double speed_of_light_mps = 299792458.0; // m/s const double speed_of_light_mps = 299792458.0; // m/s
@ -45,6 +45,7 @@ private:
const std::string frac_str[4] = { "", "1/4 ", "1/2 ", "3/4 " }; const std::string frac_str[4] = { "", "1/4 ", "1/2 ", "3/4 " };
double get_decimals(double num, int16_t mult, bool round = false);
void update_result(); void update_result();
Labels labels { Labels labels {