altoslib: Switch distance from m/ft to km/miles for large values

This adds lots of infrastructure to deal with making the unit used
depend on the value itself, and then uses it only for distances.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/altoslib/AltosUnitsRange.java b/altoslib/AltosUnitsRange.java
new file mode 100644
index 00000000..9239481a
--- /dev/null
+++ b/altoslib/AltosUnitsRange.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+package org.altusmetrum.altoslib_10;
+
+import java.text.*;
+
+public abstract class AltosUnitsRange {
+
+	AltosUnits	units;
+
+	double		lower_limit;
+	String		show_units;
+	String		say_units;
+
+	abstract double	value(double v);
+	abstract int show_fraction(int width);
+	abstract int say_fraction();
+
+	AltosUnitsRange(AltosUnits units, boolean imperial_units) {
+		this.units = units;
+		this.show_units = units.show_units(imperial_units);
+		this.say_units = units.say_units(imperial_units);
+	}
+
+	AltosUnitsRange(double lower_limit, String show_units, String say_units) {
+		this.units = null;
+		this.lower_limit = lower_limit;
+		this.show_units = show_units;
+		this.say_units = say_units;
+	}
+}