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diff --git a/labb8/src/trailblazergui.h b/labb8/src/trailblazergui.h
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+/*
+ * TDDD86 Trailblazer
+ * This file declares functions to perform drawing in the graphical user
+ * interface (GUI).
+ * See gui.cpp for implementation of each function.
+ *
+ * Please do not modify this provided file. Your turned-in files should work
+ * with an unmodified version of all provided code files.
+ *
+ * Author: Marty Stepp, Keith Schwarz, et al
+ * Slight modifications by Tommy Farnqvist
+ */
+
+#ifndef _gui_h
+#define _gui_h
+
+#include "gevents.h"
+#include "grid.h"
+#include "types.h"
+
+/*
+ * An enumerated type tracking what type of world is currently selected so that
+ * we can determine which clicked locations are legal.
+ */
+enum WorldType {
+    TERRAIN_WORLD,
+    MAZE_WORLD
+};
+
+/*
+ * An enumerated type representing how large the world is, categorized as one
+ * of three different size classes.
+ */
+enum WorldSize {
+    TINY_WORLD,
+    SMALL_WORLD,
+    MEDIUM_WORLD,
+    LARGE_WORLD,
+    HUGE_WORLD
+};
+
+/*
+ * The UI is a state machine that can be in one of four states:
+ *
+ *  1. Fresh:  Nothing has been done yet.
+ *  2. Marked: One location has been selected.
+ *  3. Drawn:  Both locations have been selected, and a path is drawn.
+ *
+ * This enumerated type stores this information.
+ */
+enum UIState {
+    FRESH,
+    MARKED,
+    DRAWN
+};
+
+/*
+ * A utility struct that bundles together the state of the world.
+ */
+struct State {
+    Grid<double> world;    // The world.
+    WorldType worldType;   // The type of world.
+    UIState uiState;       // Which state we're in.
+};
+
+/*
+ * Highlights the specified cell in the world the given color, which must be
+ * either GRAY, YELLOW, or GREEN.
+ */
+void colorCell(Grid<double>& world, TBLoc loc, Color locColor);
+
+/*
+ * Initializes state of the GUI subsystem.
+ */
+void initializeGUI();
+
+/*
+ * Reacts to an action event in the window.
+ */
+void processActionEvent(GActionEvent e);
+
+/*
+ * Reacts to a mouse event in the window.
+ */
+void processMouseEvent(GMouseEvent e);
+
+#endif