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- More precise calculation thanks to BigDecimals

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- instead of adding one and ignore the postdecimals in FormatTools.minutesToTimeString, round to integer
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fabianArbeit
2025-08-06 12:17:54 +02:00
parent d0687c9568
commit e88c1a3d49
1 changed files with 28 additions and 18 deletions
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46
zeitlaeufer/src/main/java/de/szimnau/DrinkingBar.java
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@@ -6,6 +6,8 @@ import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;
import java.nio.charset.StandardCharsets;
import java.text.DecimalFormat;
import java.time.LocalTime;
@@ -20,16 +22,17 @@ public class DrinkingBar extends AbstractLoadingBar {
private static final int MINUTES_BEFORE_PAUSE = 4 * CommonTools.MINS_PER_HOUR + MINS_PER_HALF_HOUR;
private static final int MINUTES_WITH_PAUSE = 6 * CommonTools.MINS_PER_HOUR;
private static final int DEFAULT_TOTAL_TIME = 8 * CommonTools.MINS_PER_HOUR + MINS_PER_HALF_HOUR;
private static final double DEFAULT_TOTAL_LITRES = 2.0;
private static final double QUARTER_LITRE = 0.25;
private static final BigDecimal DEFAULT_TOTAL_TIME_BD = BigDecimal.valueOf(DEFAULT_TOTAL_TIME);
private static final BigDecimal DEFAULT_TOTAL_LITRES = BigDecimal.valueOf(2.0);
private static final BigDecimal QUARTER_LITRE = BigDecimal.valueOf(0.25);
private static final DecimalFormat LITER_FORMAT = new DecimalFormat("0.00");
private double totalLitres;
private BigDecimal totalLitresBD;
protected DrinkingBar(LocalTime startTime) {
super(startTime, DEFAULT_TOTAL_TIME);
this.totalLitres = DEFAULT_TOTAL_LITRES;
this.totalLitresBD = DEFAULT_TOTAL_LITRES;
}
@@ -38,13 +41,15 @@ public class DrinkingBar extends AbstractLoadingBar {
super.setEndTime(endTime);
// correct necessary litres to drink based on the end time.
// lower the volume in quarter litre steps
double calcTotalLitres = DEFAULT_TOTAL_LITRES;
double totalLitresFromMinutes = calcTotalLitres / DEFAULT_TOTAL_TIME * getTotalMinutes();
BigDecimal calcTotalLitres = DEFAULT_TOTAL_LITRES;
BigDecimal totalLitresFromMinutes = DEFAULT_TOTAL_LITRES
.multiply(getTotalMinutesBD()) // reverse dreisatz
.divide(DEFAULT_TOTAL_TIME_BD, MathContext.DECIMAL64);
do {
calcTotalLitres -= QUARTER_LITRE;
} while (calcTotalLitres >= totalLitresFromMinutes);
calcTotalLitres = calcTotalLitres.subtract(QUARTER_LITRE);
} while (calcTotalLitres.compareTo(totalLitresFromMinutes) >= 0);
// add quarter since we always did a step "too many", due to the do ... while loop
this.totalLitres = calcTotalLitres + QUARTER_LITRE;
this.totalLitresBD = calcTotalLitres.add(QUARTER_LITRE);
}
@@ -59,13 +64,19 @@ public class DrinkingBar extends AbstractLoadingBar {
@Override
protected String fillLoadingBar(long passedMinutes, boolean progressive) {
long effectivePassedMinutes = passedMinutes;
long effectivePassedMinutes = passedMinutes < 0 ? 0 : passedMinutes;
if (getTotalMinutes() > MINUTES_WITH_PAUSE && passedMinutes > MINUTES_BEFORE_PAUSE && passedMinutes <= MINUTES_WITH_PAUSE) {
effectivePassedMinutes = MINUTES_BEFORE_PAUSE;
}
double currentLitres = totalLitres / getTotalMinutes() * effectivePassedMinutes + QUARTER_LITRE;
double printedLitres = currentLitres - (currentLitres % QUARTER_LITRE);
// double currentProgressToNextStep = 100 / QUARTER_LITRE * (currentLitres - printedLitres);
var effectivePassedMinutesBD = BigDecimal.valueOf(effectivePassedMinutes);
BigDecimal currentLitres = totalLitresBD
.multiply(effectivePassedMinutesBD) // reverse dreisatz
.divide(getTotalMinutesBD(), MathContext.DECIMAL64)
.add(QUARTER_LITRE);
BigDecimal printedLitres = currentLitres.subtract(currentLitres.remainder(QUARTER_LITRE, MathContext.DECIMAL64));
/* BigDecimal currentProgressToNextStep = ONE_HUNDRED_PERCENT
.multiply(currentLitres.subtract(printedLitres)) // reverse dreisatz
.divide(QUARTER_LITRE, MathContext.DECIMAL64); */
BigDecimal minutesToNextStep = getMinutesToNextStep(currentLitres);
String progressivePart = progressive ? "\r" : "";
return progressivePart + "Aktuelles Volumen: " + LITER_FORMAT.format(printedLitres) + "L - "
@@ -74,13 +85,12 @@ public class DrinkingBar extends AbstractLoadingBar {
}
private BigDecimal getMinutesToNextStep(double currentLitres) {
private BigDecimal getMinutesToNextStep(BigDecimal currentLitres) {
// berechne Liter benötigt bis zum nächsten 0.25er Schritt
double litresToNextStep = QUARTER_LITRE - (currentLitres % QUARTER_LITRE);
BigDecimal litresToNextStep = QUARTER_LITRE.subtract(currentLitres.remainder(QUARTER_LITRE));
// berechne Minuten benötigt für 1 Liter
double minutesPerLitre = getTotalMinutes() / totalLitres;
BigDecimal minutesPerLitre = getTotalMinutesBD().divide(totalLitresBD);
// berechne Minuten benötigt bis zum nächsten 0.25er Schritt
// + 1 since we only show minutes and have to adjust for the "ignored" seconds
return BigDecimal.valueOf((minutesPerLitre * litresToNextStep) + 1);
return minutesPerLitre.multiply(litresToNextStep).setScale(0, RoundingMode.HALF_EVEN);
}
}