36 files changed, 332 insertions, 176 deletions

diff --git a/src/controller/callbacks/keyboard.c b/src/controller/callbacks/keyboard.c
new file mode 100644
index 0000000..1187bce
--- a/dev/null
+++ b/src/controller/callbacks/keyboard.c
@@ -0,0 +1,66 @@
+#include "keyboard.h"
+#include "../actions/clear_selection.h"
+#include "../actions/selection_from_db.h"
+#include "reshape.h"
+#include "../../view/exp004state0.h"
+#include <GL/glut.h>
+
+#define S exp004state0
+
+void
+keyboard (unsigned char key, int x, int y)
+{
+  switch (key)
+    {
+    case 27:
+      /*
+       * ESC Pressed.
+       */
+      clear_selection ();
+      glutPostRedisplay ();
+      break;
+
+    case 'g':
+      /*
+       * g has been pressed.  This is used to load a selection from
+       * the database since it is the convention to use g for
+       * refreshing a buffer in Emacs.
+       */
+      selection_from_db ();
+      glutPostRedisplay ();
+      break;
+
+    case 'l':
+      /* 
+       * Toggle display of the legend.
+       */
+      S.legend = !S.legend;
+      glutPostRedisplay ();
+      break;
+
+    case 'r':
+      /*
+       * Reset the view (unzoom).
+       */
+      S.zoom.active = false;
+      reshape (S.viewport.w, S.viewport.h);
+      glutPostRedisplay ();
+      break;
+
+    case 's':
+      /*
+       * Selection will be used to define a set.
+       */
+      S.selection.purpose = SET;
+      break;
+
+    case 'z':
+      /*
+       * Selection will be use to zoom.
+       */
+      S.selection.purpose = ZOOM;
+      break;
+    }
+
+  return;
+}