From: Keith Packard <keithp@keithp.com>
Date: Thu, 25 Aug 2011 02:13:03 +0000 (-0700)
Subject: altosui: Make flight monitor font size configurable
X-Git-Tag: 1.0~24^2~1
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=cbfbaabb39f9f7709d00cf3dc63cc1bc7563062e

altosui: Make flight monitor font size configurable

Tiny netbooks aren't tall enough for the 'usual' font size, so provide
a smaller option. Then provide a bigger option, just because.

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

diff --git a/altosui/Altos.java b/altosui/Altos.java
index ddf1005a..e4f974f9 100644
--- a/altosui/Altos.java
+++ b/altosui/Altos.java
@@ -97,9 +97,45 @@ public class Altos {
 
 	static final int tab_elt_pad = 5;
 
-	static final Font label_font = new Font("Dialog", Font.PLAIN, 22);
-	static final Font value_font = new Font("Monospaced", Font.PLAIN, 22);
-	static final Font status_font = new Font("SansSerif", Font.BOLD, 24);
+	static Font label_font;
+	static Font value_font;
+	static Font status_font;
+	static Font table_label_font;
+	static Font table_value_font;
+
+	final static int font_size_small = 1;
+	final static int font_size_medium = 2;
+	final static int font_size_large = 3;
+
+	static void set_fonts(int size) {
+		int	brief_size;
+		int	table_size;
+		int	status_size;
+
+		switch (size) {
+		case font_size_small:
+			brief_size = 16;
+			status_size = 18;
+			table_size = 11;
+			break;
+		default:
+		case font_size_medium:
+			brief_size = 22;
+			status_size = 24;
+			table_size = 14;
+			break;
+		case font_size_large:
+			brief_size = 26;
+			status_size = 30;
+			table_size = 17;
+			break;
+		}
+		label_font = new Font("Dialog", Font.PLAIN, brief_size);
+		value_font = new Font("Monospaced", Font.PLAIN, brief_size);
+		status_font = new Font("SansSerif", Font.BOLD, status_size);
+		table_label_font = new Font("SansSerif", Font.PLAIN, table_size);
+		table_value_font = new Font("Monospaced", Font.PLAIN, table_size);
+	}
 
 	static final int text_width = 20;
 
diff --git a/altosui/AltosAscent.java b/altosui/AltosAscent.java
index d607b0c5..c8e5f3af 100644
--- a/altosui/AltosAscent.java
+++ b/altosui/AltosAscent.java
@@ -30,6 +30,7 @@ import java.util.concurrent.LinkedBlockingQueue;
 
 public class AltosAscent extends JComponent implements AltosFlightDisplay {
 	GridBagLayout	layout;
+	JLabel			cur, max;
 
 	public class AscentStatus {
 		JLabel		label;
@@ -54,6 +55,11 @@ public class AltosAscent extends JComponent implements AltosFlightDisplay {
 			lights.set(false);
 		}
 
+		void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		public AscentStatus (GridBagLayout layout, int y, String text) {
 			GridBagConstraints	c = new GridBagConstraints();
 			c.weighty = 1;
@@ -109,6 +115,11 @@ public class AltosAscent extends JComponent implements AltosFlightDisplay {
 			label.setVisible(false);
 			value.setVisible(false);
 		}
+		void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		public AscentValue (GridBagLayout layout, int y, String text) {
 			GridBagConstraints	c = new GridBagConstraints();
 			c.weighty = 1;
@@ -151,6 +162,12 @@ public class AltosAscent extends JComponent implements AltosFlightDisplay {
 			max = AltosRecord.MISSING;
 		}
 
+		void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+			max_value.setFont(Altos.value_font);
+		}
+
 		void show(String format, double v) {
 			if (v == AltosRecord.MISSING) {
 				value.setText("Missing");
@@ -314,6 +331,18 @@ public class AltosAscent extends JComponent implements AltosFlightDisplay {
 		accel.reset();
 	}
 
+	public void set_font() {
+		cur.setFont(Altos.label_font);
+		max.setFont(Altos.label_font);
+		lat.set_font();
+		lon.set_font();
+		main.set_font();
+		apogee.set_font();
+		height.set_font();
+		speed.set_font();
+		accel.set_font();
+	}
+
 	public void show(AltosState state, int crc_errors) {
 		if (state.gps != null && state.gps.connected) {
 			lat.show(state, crc_errors);
@@ -337,7 +366,6 @@ public class AltosAscent extends JComponent implements AltosFlightDisplay {
 
 	public void labels(GridBagLayout layout, int y) {
 		GridBagConstraints	c;
-		JLabel			cur, max;
 
 		cur = new JLabel("Current");
 		cur.setFont(Altos.label_font);
diff --git a/altosui/AltosCompanionInfo.java b/altosui/AltosCompanionInfo.java
index f287a8ea..82bde623 100644
--- a/altosui/AltosCompanionInfo.java
+++ b/altosui/AltosCompanionInfo.java
@@ -31,25 +31,26 @@ import java.util.concurrent.LinkedBlockingQueue;
 public class AltosCompanionInfo extends JTable {
 	private AltosFlightInfoTableModel model;
 
-	private Font infoLabelFont = new Font("SansSerif", Font.PLAIN, 14);
-	private Font infoValueFont = new Font("Monospaced", Font.PLAIN, 14);
-
 	static final int info_columns = 2;
 	static final int info_rows = 17;
 
 	int desired_row_height() {
-		FontMetrics	infoValueMetrics = getFontMetrics(infoValueFont);
+		FontMetrics	infoValueMetrics = getFontMetrics(Altos.table_value_font);
 		return (infoValueMetrics.getHeight() + infoValueMetrics.getLeading()) * 18 / 10;
 	}
 
+	public void set_font() {
+		setFont(Altos.table_value_font);
+		setRowHeight(desired_row_height());
+		doLayout();
+	}
+
 	public AltosCompanionInfo() {
 		super(new AltosFlightInfoTableModel(info_rows, info_columns));
 		model = (AltosFlightInfoTableModel) getModel();
-		setFont(infoValueFont);
 		setAutoResizeMode(AUTO_RESIZE_ALL_COLUMNS);
 		setShowGrid(true);
-		setRowHeight(desired_row_height());
-		doLayout();
+		set_font();
 	}
 
 	public Dimension getPreferredScrollableViewportSize() {
diff --git a/altosui/AltosConfigureUI.java b/altosui/AltosConfigureUI.java
index 0c865d0e..bcb9636b 100644
--- a/altosui/AltosConfigureUI.java
+++ b/altosui/AltosConfigureUI.java
@@ -47,12 +47,17 @@ public class AltosConfigureUI
 	JLabel		callsign_label;
 	JTextField	callsign_value;
 
+	JLabel		font_size_label;
+	JComboBox	font_size_value;
+
 	JRadioButton	serial_debug;
 
 // BLUETOOTH
 //	JButton		manage_bluetooth;
 	JButton		manage_frequencies;
 
+	final static String[] font_size_names = { "Small", "Medium", "Large" };
+
 	/* DocumentListener interface methods */
 	public void changedUpdate(DocumentEvent e) {
 		AltosPreferences.set_callsign(callsign_value.getText());
@@ -73,6 +78,8 @@ public class AltosConfigureUI
 
 		Insets insets = new Insets(4, 4, 4, 4);
 
+		int row = 0;
+
 		owner = in_owner;
 		voice = in_voice;
 		pane = getContentPane();
@@ -85,14 +92,14 @@ public class AltosConfigureUI
 
 		/* Nice label at the top */
 		c.gridx = 0;
-		c.gridy = 0;
+		c.gridy = row++;
 		c.gridwidth = 3;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.CENTER;
 		pane.add(new JLabel ("Configure AltOS UI"), c);
 
 		c.gridx = 0;
-		c.gridy = 1;
+		c.gridy = row++;
 		c.gridwidth = 3;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.CENTER;
@@ -100,7 +107,7 @@ public class AltosConfigureUI
 
 		/* Voice settings */
 		c.gridx = 0;
-		c.gridy = 2;
+		c.gridy = row;
 		c.gridwidth = 1;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.WEST;
@@ -119,7 +126,7 @@ public class AltosConfigureUI
 				}
 			});
 		c.gridx = 1;
-		c.gridy = 2;
+		c.gridy = row;
 		c.gridwidth = 1;
 		c.weightx = 1;
 		c.fill = GridBagConstraints.NONE;
@@ -128,7 +135,7 @@ public class AltosConfigureUI
 		enable_voice.setToolTipText("Enable/Disable all audio in-flight announcements");
 
 		c.gridx = 2;
-		c.gridy = 2;
+		c.gridy = row++;
 		c.gridwidth = 1;
 		c.weightx = 1;
 		c.fill = GridBagConstraints.NONE;
@@ -144,7 +151,7 @@ public class AltosConfigureUI
 
 		/* Log directory settings */
 		c.gridx = 0;
-		c.gridy = 3;
+		c.gridy = row;
 		c.gridwidth = 1;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.WEST;
@@ -158,7 +165,7 @@ public class AltosConfigureUI
 				}
 			});
 		c.gridx = 1;
-		c.gridy = 3;
+		c.gridy = row++;
 		c.gridwidth = 2;
 		c.fill = GridBagConstraints.BOTH;
 		c.anchor = GridBagConstraints.WEST;
@@ -167,7 +174,7 @@ public class AltosConfigureUI
 
 		/* Callsign setting */
 		c.gridx = 0;
-		c.gridy = 4;
+		c.gridy = row;
 		c.gridwidth = 1;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.WEST;
@@ -176,16 +183,42 @@ public class AltosConfigureUI
 		callsign_value = new JTextField(AltosPreferences.callsign());
 		callsign_value.getDocument().addDocumentListener(this);
 		c.gridx = 1;
-		c.gridy = 4;
+		c.gridy = row++;
 		c.gridwidth = 2;
 		c.fill = GridBagConstraints.BOTH;
 		c.anchor = GridBagConstraints.WEST;
 		pane.add(callsign_value, c);
 		callsign_value.setToolTipText("Callsign sent in packet mode");
 
+		/* Font size setting */
+		c.gridx = 0;
+		c.gridy = row;
+		c.gridwidth = 1;
+		c.fill = GridBagConstraints.NONE;
+		c.anchor = GridBagConstraints.WEST;
+		pane.add(new JLabel("Font size"), c);
+
+		font_size_value = new JComboBox(font_size_names);
+		int font_size = AltosPreferences.font_size();
+		font_size_value.setSelectedIndex(font_size - Altos.font_size_small);
+		font_size_value.addActionListener(new ActionListener() {
+				public void actionPerformed(ActionEvent e) {
+					int	size = font_size_value.getSelectedIndex() + Altos.font_size_small;
+
+					AltosPreferences.set_font_size(size);
+				}
+			});
+		c.gridx = 1;
+		c.gridy = row++;
+		c.gridwidth = 2;
+		c.fill = GridBagConstraints.BOTH;
+		c.anchor = GridBagConstraints.WEST;
+		pane.add(font_size_value, c);
+		font_size_value.setToolTipText("Font size used in telemetry window");
+
 		/* Serial debug setting */
 		c.gridx = 0;
-		c.gridy = 5;
+		c.gridy = row;
 		c.gridwidth = 1;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.WEST;
@@ -202,7 +235,7 @@ public class AltosConfigureUI
 		serial_debug.setToolTipText("Enable/Disable USB I/O getting sent to the console");
 
 		c.gridx = 1;
-		c.gridy = 5;
+		c.gridy = row++;
 		c.gridwidth = 3;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.WEST;
@@ -216,7 +249,7 @@ public class AltosConfigureUI
 //				}
 //			});
 //		c.gridx = 0;
-//		c.gridy = 6;
+//		c.gridy = row++;
 //		c.gridwidth = 2;
 //		c.fill = GridBagConstraints.NONE;
 //		c.anchor = GridBagConstraints.WEST;
@@ -232,7 +265,7 @@ public class AltosConfigureUI
 // BLUETOOTH
 //		c.gridx = 2;
 		c.gridx = 1;
-		c.gridy = 6;
+		c.gridy = row++;
 		c.gridwidth = 2;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.WEST;
@@ -246,7 +279,7 @@ public class AltosConfigureUI
 				}
 			});
 		c.gridx = 0;
-		c.gridy = 7;
+		c.gridy = row++;
 		c.gridwidth = 3;
 		c.fill = GridBagConstraints.NONE;
 		c.anchor = GridBagConstraints.CENTER;
diff --git a/altosui/AltosDescent.java b/altosui/AltosDescent.java
index 2a9e7eef..0fcd690b 100644
--- a/altosui/AltosDescent.java
+++ b/altosui/AltosDescent.java
@@ -55,6 +55,11 @@ public class AltosDescent extends JComponent implements AltosFlightDisplay {
 			lights.set(false);
 		}
 
+		void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		public DescentStatus (GridBagLayout layout, int y, String text) {
 			GridBagConstraints	c = new GridBagConstraints();
 			c.weighty = 1;
@@ -121,6 +126,11 @@ public class AltosDescent extends JComponent implements AltosFlightDisplay {
 			value.setText(v);
 		}
 
+		void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		public DescentValue (GridBagLayout layout, int x, int y, String text) {
 			GridBagConstraints	c = new GridBagConstraints();
 			c.weighty = 1;
@@ -169,6 +179,12 @@ public class AltosDescent extends JComponent implements AltosFlightDisplay {
 			value2.setVisible(false);
 		}
 
+		void set_font() {
+			label.setFont(Altos.label_font);
+			value1.setFont(Altos.value_font);
+			value2.setFont(Altos.value_font);
+		}
+
 		abstract void show(AltosState state, int crc_errors);
 
 		void show(String v1, String v2) {
@@ -361,6 +377,18 @@ public class AltosDescent extends JComponent implements AltosFlightDisplay {
 		apogee.reset();
 	}
 
+	public void set_font() {
+		lat.set_font();
+		lon.set_font();
+		height.set_font();
+		speed.set_font();
+		bearing.set_font();
+		range.set_font();
+		elevation.set_font();
+		main.set_font();
+		apogee.set_font();
+	}
+
 	public void show(AltosState state, int crc_errors) {
 		height.show(state, crc_errors);
 		speed.show(state, crc_errors);
diff --git a/altosui/AltosFlightDisplay.java b/altosui/AltosFlightDisplay.java
index d18d1d1f..f633c8e6 100644
--- a/altosui/AltosFlightDisplay.java
+++ b/altosui/AltosFlightDisplay.java
@@ -21,4 +21,6 @@ public interface AltosFlightDisplay {
 	void reset();
 
 	void show(AltosState state, int crc_errors);
+
+	void set_font();
 }
diff --git a/altosui/AltosFlightStatus.java b/altosui/AltosFlightStatus.java
index 59c9e9db..ed273384 100644
--- a/altosui/AltosFlightStatus.java
+++ b/altosui/AltosFlightStatus.java
@@ -40,6 +40,12 @@ public class AltosFlightStatus extends JComponent implements AltosFlightDisplay
 		void reset() {
 			value.setText("");
 		}
+
+		void set_font() {
+			label.setFont(Altos.status_font);
+			value.setFont(Altos.status_font);
+		}
+
 		public FlightValue (GridBagLayout layout, int x, String text) {
 			GridBagConstraints	c = new GridBagConstraints();
 			c.insets = new Insets(5, 5, 5, 5);
@@ -127,6 +133,14 @@ public class AltosFlightStatus extends JComponent implements AltosFlightDisplay
 		rssi.reset();
 	}
 
+	public void set_font () {
+		call.set_font();
+		serial.set_font();
+		flight.set_font();
+		flight_state.set_font();
+		rssi.set_font();
+	}
+
 	public void show (AltosState state, int crc_errors) {
 		call.show(state, crc_errors);
 		serial.show(state, crc_errors);
diff --git a/altosui/AltosFlightUI.java b/altosui/AltosFlightUI.java
index abe08a18..b44b9d43 100644
--- a/altosui/AltosFlightUI.java
+++ b/altosui/AltosFlightUI.java
@@ -28,7 +28,7 @@ import java.text.*;
 import java.util.prefs.*;
 import java.util.concurrent.*;
 
-public class AltosFlightUI extends JFrame implements AltosFlightDisplay {
+public class AltosFlightUI extends JFrame implements AltosFlightDisplay, AltosFontListener {
 	AltosVoice		voice;
 	AltosFlightReader	reader;
 	AltosDisplayThread	thread;
@@ -83,6 +83,21 @@ public class AltosFlightUI extends JFrame implements AltosFlightDisplay {
 		sitemap.reset();
 	}
 
+	public void set_font() {
+		pad.set_font();
+		ascent.set_font();
+		descent.set_font();
+		landed.set_font();
+		flightStatus.set_font();
+		flightInfo.set_font();
+		sitemap.set_font();
+		companion.set_font();
+	}
+
+	public void font_size_changed(int font_size) {
+		set_font();
+	}
+
 	public void show(AltosState state, int crc_errors) {
 		JComponent tab = which_tab(state);
 		try {
@@ -254,12 +269,16 @@ public class AltosFlightUI extends JFrame implements AltosFlightDisplay {
 		bag.add(pane, c);
 
 		setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+
+		AltosPreferences.register_font_listener(this);
+
 		addWindowListener(new WindowAdapter() {
 				@Override
 				public void windowClosing(WindowEvent e) {
 					disconnect();
 					setVisible(false);
 					dispose();
+					AltosPreferences.unregister_font_listener(AltosFlightUI.this);
 					if (exit_on_close)
 						System.exit(0);
 				}
diff --git a/altosui/AltosFontListener.java b/altosui/AltosFontListener.java
new file mode 100644
index 00000000..0dda0f29
--- /dev/null
+++ b/altosui/AltosFontListener.java
@@ -0,0 +1,22 @@
+/*
+ * Copyright © 2011 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 altosui;
+
+public interface AltosFontListener {
+	void font_size_changed(int font_size);
+}
diff --git a/altosui/AltosIdleMonitorUI.java b/altosui/AltosIdleMonitorUI.java
index 142f0278..988a797c 100644
--- a/altosui/AltosIdleMonitorUI.java
+++ b/altosui/AltosIdleMonitorUI.java
@@ -284,6 +284,11 @@ public class AltosIdleMonitorUI extends JFrame implements AltosFlightDisplay {
 		flightInfo.clear();
 	}
 
+	public void set_font() {
+		pad.set_font();
+		flightInfo.set_font();
+	}
+
 	public void show(AltosState state, int crc_errors) {
 		try {
 			pad.show(state, crc_errors);
diff --git a/altosui/AltosInfoTable.java b/altosui/AltosInfoTable.java
index 8ebeaba1..c023369e 100644
--- a/altosui/AltosInfoTable.java
+++ b/altosui/AltosInfoTable.java
@@ -31,27 +31,29 @@ import java.util.concurrent.LinkedBlockingQueue;
 public class AltosInfoTable extends JTable {
 	private AltosFlightInfoTableModel model;
 
-	private Font infoLabelFont = new Font("SansSerif", Font.PLAIN, 14);
-	private Font infoValueFont = new Font("Monospaced", Font.PLAIN, 14);
-
 	static final int info_columns = 3;
 	static final int info_rows = 17;
 
 	int desired_row_height() {
-		FontMetrics	infoValueMetrics = getFontMetrics(infoValueFont);
+		FontMetrics	infoValueMetrics = getFontMetrics(Altos.table_value_font);
 		return (infoValueMetrics.getHeight() + infoValueMetrics.getLeading()) * 18 / 10;
 	}
 
 	public AltosInfoTable() {
 		super(new AltosFlightInfoTableModel(info_rows, info_columns));
 		model = (AltosFlightInfoTableModel) getModel();
-		setFont(infoValueFont);
+		setFont(Altos.table_value_font);
 		setAutoResizeMode(AUTO_RESIZE_ALL_COLUMNS);
 		setShowGrid(true);
 		setRowHeight(desired_row_height());
 		doLayout();
 	}
 
+	public void set_font() {
+		setFont(Altos.table_value_font);
+		doLayout();
+	}
+
 	public Dimension getPreferredScrollableViewportSize() {
 		return getPreferredSize();
 	}
diff --git a/altosui/AltosLanded.java b/altosui/AltosLanded.java
index 71c10663..50e6b542 100644
--- a/altosui/AltosLanded.java
+++ b/altosui/AltosLanded.java
@@ -30,8 +30,6 @@ import java.util.concurrent.LinkedBlockingQueue;
 
 public class AltosLanded extends JComponent implements AltosFlightDisplay, ActionListener {
 	GridBagLayout	layout;
-	Font		label_font;
-	Font		value_font;
 
 	public class LandedValue {
 		JLabel		label;
@@ -47,6 +45,11 @@ public class AltosLanded extends JComponent implements AltosFlightDisplay, Actio
 			value.setVisible(true);
 		}
 
+		public void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		void hide() {
 			label.setVisible(false);
 			value.setVisible(false);
@@ -63,7 +66,7 @@ public class AltosLanded extends JComponent implements AltosFlightDisplay, Actio
 			c.weighty = 1;
 
 			label = new JLabel(text);
-			label.setFont(label_font);
+			label.setFont(Altos.label_font);
 			label.setHorizontalAlignment(SwingConstants.LEFT);
 			c.gridx = 0; c.gridy = y;
 			c.insets = new Insets(10, 10, 10, 10);
@@ -74,7 +77,7 @@ public class AltosLanded extends JComponent implements AltosFlightDisplay, Actio
 			add(label);
 
 			value = new JTextField(Altos.text_width);
-			value.setFont(value_font);
+			value.setFont(Altos.value_font);
 			value.setHorizontalAlignment(SwingConstants.RIGHT);
 			c.gridx = 1; c.gridy = y;
 			c.anchor = GridBagConstraints.WEST;
@@ -199,6 +202,16 @@ public class AltosLanded extends JComponent implements AltosFlightDisplay, Actio
 		accel.reset();
 	}
 
+	public void set_font() {
+		lat.set_font();
+		lon.set_font();
+		bearing.set_font();
+		distance.set_font();
+		height.set_font();
+		speed.set_font();
+		accel.set_font();
+	}
+
 	public void show(AltosState state, int crc_errors) {
 		if (state.gps != null && state.gps.connected) {
 			bearing.show(state, crc_errors);
@@ -259,8 +272,6 @@ public class AltosLanded extends JComponent implements AltosFlightDisplay, Actio
 
 		reader = in_reader;
 
-		label_font = new Font("Dialog", Font.PLAIN, 22);
-		value_font = new Font("Monospaced", Font.PLAIN, 22);
 		setLayout(layout);
 
 		/* Elements in descent display */
diff --git a/altosui/AltosPad.java b/altosui/AltosPad.java
index 3a8d04fe..6ef66f7a 100644
--- a/altosui/AltosPad.java
+++ b/altosui/AltosPad.java
@@ -54,6 +54,11 @@ public class AltosPad extends JComponent implements AltosFlightDisplay {
 			lights.setVisible(false);
 		}
 
+		public void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		public LaunchStatus (GridBagLayout layout, int y, String text) {
 			GridBagConstraints	c = new GridBagConstraints();
 			c.weighty = 1;
@@ -105,6 +110,11 @@ public class AltosPad extends JComponent implements AltosFlightDisplay {
 			value.setVisible(false);
 		}
 
+		public void set_font() {
+			label.setFont(Altos.label_font);
+			value.setFont(Altos.value_font);
+		}
+
 		void reset() {
 			value.setText("");
 		}
@@ -282,6 +292,18 @@ public class AltosPad extends JComponent implements AltosFlightDisplay {
 		pad_alt.reset();
 	}
 
+	public void set_font() {
+		battery.set_font();
+		apogee.set_font();
+		main.set_font();
+		logging_ready.set_font();
+		gps_locked.set_font();
+		gps_ready.set_font();
+		pad_lat.set_font();
+		pad_lon.set_font();
+		pad_alt.set_font();
+	}
+	
 	public void show(AltosState state, int crc_errors) {
 		battery.show(state, crc_errors);
 		if (state.drogue_sense == AltosRecord.MISSING)
diff --git a/altosui/AltosPreferences.java b/altosui/AltosPreferences.java
index de926b38..716559ab 100644
--- a/altosui/AltosPreferences.java
+++ b/altosui/AltosPreferences.java
@@ -55,6 +55,9 @@ class AltosPreferences {
 	/* scanning telemetry preferences name */
 	final static String scanningTelemetryPreference = "SCANNING-TELEMETRY";
 
+	/* font size preferences name */
+	final static String fontSizePreference = "FONT-SIZE";
+
 	/* Default logdir is ~/TeleMetrum */
 	final static String logdirName = "TeleMetrum";
 
@@ -88,6 +91,10 @@ class AltosPreferences {
 	/* Scanning telemetry */
 	static int scanning_telemetry;
 
+	static LinkedList<AltosFontListener> font_listeners;
+
+	static int font_size = Altos.font_size_medium;
+
 	/* List of frequencies */
 	final static String common_frequencies_node_name = "COMMON-FREQUENCIES";
 	static AltosFrequency[] common_frequencies;
@@ -164,6 +171,11 @@ class AltosPreferences {
 
 		scanning_telemetry = preferences.getInt(scanningTelemetryPreference,(1 << Altos.ao_telemetry_standard));
 
+		font_listeners = new LinkedList<AltosFontListener>();
+
+		font_size = preferences.getInt(fontSizePreference, Altos.font_size_medium);
+		Altos.set_fonts(font_size);
+
 		String firmwaredir_string = preferences.get(firmwaredirPreference, null);
 		if (firmwaredir_string != null)
 			firmwaredir = new File(firmwaredir_string);
@@ -335,6 +347,36 @@ class AltosPreferences {
 		return firmwaredir;
 	}
 
+	public static int font_size() {
+		return font_size;
+	}
+
+	static void set_fonts() {
+	}
+
+	public static void set_font_size(int new_font_size) {
+		font_size = new_font_size;
+		synchronized (preferences) {
+			preferences.putInt(fontSizePreference, font_size);
+			flush_preferences();
+			Altos.set_fonts(font_size);
+			for (AltosFontListener l : font_listeners)
+				l.font_size_changed(font_size);
+		}
+	}
+
+	public static void register_font_listener(AltosFontListener l) {
+		synchronized (preferences) {
+			font_listeners.add(l);
+		}
+	}
+
+	public static void unregister_font_listener(AltosFontListener l) {
+		synchronized (preferences) {
+			font_listeners.remove(l);
+		}
+	}
+
 	public static void set_serial_debug(boolean new_serial_debug) {
 		serial_debug = new_serial_debug;
 		AltosSerial.set_debug(serial_debug);
diff --git a/altosui/AltosSiteMap.java b/altosui/AltosSiteMap.java
index b3fb3c54..c258b3e5 100644
--- a/altosui/AltosSiteMap.java
+++ b/altosui/AltosSiteMap.java
@@ -146,6 +146,10 @@ public class AltosSiteMap extends JScrollPane implements AltosFlightDisplay {
 		// nothing
 	}
 
+	public void set_font() {
+		// nothing
+	}
+
 	private void loadMap(final AltosSiteMapTile tile,
 			     File pngfile, String pngurl)
 	{
diff --git a/altosui/Makefile.am b/altosui/Makefile.am
index f626d3fa..ba1c830c 100644
--- a/altosui/Makefile.am
+++ b/altosui/Makefile.am
@@ -57,6 +57,7 @@ altosui_JAVA = \
 	AltosFlightStatsTable.java \
 	AltosFlightStatus.java \
 	AltosFlightUI.java \
+	AltosFontListener.java \
 	AltosFrequency.java \
 	AltosFreqList.java \
 	AltosGPS.java \
diff --git a/doc/altusmetrum.xsl b/doc/altusmetrum.xsl
index 601b62eb..df1e6635 100644
--- a/doc/altusmetrum.xsl
+++ b/doc/altusmetrum.xsl
@@ -1537,6 +1537,13 @@ NAR #88757, TRA #12200
           your local radio regulations.
         </para>
       </section>
+      <section>
+	<title>Font Size</title>
+	<para>
+	  Selects the set of fonts used in the flight monitor
+	  window. Choose between the small, medium and large sets.
+	</para>
+      </section>
       <section>
         <title>Serial Debug</title>
         <para>