altosuilib: Add 'show marker' button to graphs

Provides a marker at each actual data point which can be useful for
sparse data sets like telemetry with poor reception.

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

1 files changed, 19 insertions, 0 deletions

diff --git a/altosuilib/AltosShapeListener.java b/altosuilib/AltosShapeListener.java
new file mode 100644
index 00000000..082b6135
--- /dev/null
+++ b/altosuilib/AltosShapeListener.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright © 2017 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+package org.altusmetrum.altosuilib_12;
+
+public interface AltosShapeListener {
+	void set_shapes_visible(boolean visible);
+}