X-Git-Url: https://gitweb.fperrin.net/?a=blobdiff_plain;f=tim%2Fprune%2Fgui%2FDisplayUtils.java;h=25640d8e5072bfc2e70acfc3e26c7de208a494e3;hb=88f2c3647ed9e055090484f01a959d4581f85e7d;hp=df706b74e17c754661ebc164b22a8adf2724b56c;hpb=c0387c124840c9407e040600fda88f3c3e8f6aa6;p=GpsPrune.git

diff --git a/tim/prune/gui/DisplayUtils.java b/tim/prune/gui/DisplayUtils.java
index df706b7..25640d8 100644
--- a/tim/prune/gui/DisplayUtils.java
+++ b/tim/prune/gui/DisplayUtils.java
@@ -1,5 +1,7 @@
 package tim.prune.gui;
 
+import java.text.NumberFormat;
+
 import tim.prune.I18nManager;
 
 /**
@@ -7,6 +9,19 @@ import tim.prune.I18nManager;
  */
 public abstract class DisplayUtils
 {
+	/** Number formatter for one decimal place */
+	private static final NumberFormat FORMAT_ONE_DP = NumberFormat.getNumberInstance();
+
+	/** Static block to initialise the one d.p. formatter */
+	static
+	{
+		FORMAT_ONE_DP.setMaximumFractionDigits(1);
+		FORMAT_ONE_DP.setMinimumFractionDigits(1);
+	}
+	/** Flexible number formatter with different decimal places */
+	private static final NumberFormat FORMAT_FLEX = NumberFormat.getNumberInstance();
+
+
 	/**
 	 * Build a String to describe a time duration
 	 * @param inNumSecs number of seconds
@@ -25,4 +40,54 @@ public abstract class DisplayUtils
 		if (inNumSecs < 86400000L) return "" + (inNumSecs / 86400L) + I18nManager.getText("display.range.time.days");
 		return "big";
 	}
+
+	/**
+	 * @param inNumber number to format
+	 * @return formatted number to one decimal place
+	 */
+	public static String formatOneDp(double inNumber)
+	{
+		return FORMAT_ONE_DP.format(inNumber);
+	}
+
+	/**
+	 * Format a number to a sensible precision
+	 * @param inVal value to format
+	 * @return formatted String using local format
+	 */
+	public static String roundedNumber(double inVal)
+	{
+		// Set precision of formatter
+		int numDigits = 0;
+		if (inVal < 1.0)
+			numDigits = 3;
+		else if (inVal < 10.0)
+			numDigits = 2;
+		else if (inVal < 100.0)
+			numDigits = 1;
+		// set formatter
+		FORMAT_FLEX.setMaximumFractionDigits(numDigits);
+		FORMAT_FLEX.setMinimumFractionDigits(numDigits);
+		return FORMAT_FLEX.format(inVal);
+	}
+
+	/**
+	 * Convert the given hour and minute values into a string H:MM
+	 * @param inHour hour of day, 0-24
+	 * @param inMinute minute, 0-59
+	 * @return string, either H:MM or HH:MM
+	 */
+	public static String makeTimeString(int inHour, int inMinute)
+	{
+		StringBuilder sb = new StringBuilder();
+		final int hour = (inHour >= 0 && inHour <= 24) ? inHour : 0;
+		sb.append(hour);
+
+		sb.append(':');
+
+		final int minute = (inMinute >= 0 && inMinute <= 59) ? inMinute : 0;
+		if (minute <= 9) {sb.append('0');}
+		sb.append(minute);
+		return sb.toString();
+	}
 }