1 files changed, 55 insertions, 0 deletions
diff --git a/plotter/settings.py b/plotter/settings.py
new file mode 100755
index 0000000..61d4434
--- /dev/null
+++ b/plotter/settings.py
@@ -0,0 +1,55 @@
+"""Objects for keeping track of graph settings."""
+
+# version of settings (in case we break backward compatibility)
+_FILE_VERSION = 1
+
+
+class PlotSettings(object):
+    """Settings for displaying a plot."""
+
+    def __init__(self, xmin, xmax):
+        """Saves settings."""
+
+        self.xmin = xmin
+        self.xmax = xmax
+
+    @classmethod
+    def fromapp(settingsclass, app):
+        """Loads settings from a Plotter application."""
+
+        xmin = app.xmin_spin.get_value()
+        xmax = app.xmax_spin.get_value()
+
+        return settingsclass(xmin, xmax)
+
+    @classmethod
+    def load(settingsclass, settings):
+        """Loads settings from a file created by write()."""
+
+        # TODO: throw exception for old versions
+        if settings["version"] > _FILE_VERSION:
+            return settingsclass(0, 0)
+
+        xmin = settings["xmin"]
+        xmax = settings["xmax"]
+
+        return settingsclass(xmin, xmax)
+
+
+    def save(self):
+        """Returns serialized version of settings as dictionary."""
+
+        return {
+            "version": _FILE_VERSION,
+            "xmin": self.xmin,
+            "xmax": self.xmax,
+        }
+
+
+    def toapp(self, app):
+        """Makes application reflect values from settings."""
+
+        app.xmin_spin.set_value(self.xmin)
+        app.xmax_spin.set_value(self.xmax)
+
+