Added Assignment 3 worksheet and code

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diff --git a/dev/a3-earthquake/quake_app.h b/dev/a3-earthquake/quake_app.h
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+/** CSci-4611 Assignment 3:  Earthquake
+ */
+
+#ifndef QUAKEAPP_H_
+#define QUAKEAPP_H_
+
+#include <mingfx.h>
+using namespace mingfx;
+
+#include "earthquake_database.h"
+#include "earth.h"
+
+#include <string>
+#include <vector>
+
+
+/** Main application class for the Earthquake app. 
+ */
+class QuakeApp : public GraphicsApp {
+public:
+  
+    QuakeApp();
+    virtual ~QuakeApp();
+    
+    /// Dragging with the mouse tilts the earth when in globe mode
+    void OnLeftMouseDrag(const Point2 &pos, const Vector2 &delta);
+
+    /// Pressing the globe button toggles between flat earth and sphere earth modes
+    void OnGlobeBtnPressed();
+    
+    /// Pressing the debug button toggles on/off the underlying triangle mesh and normals
+    void OnDebugBtnPressed();
+    
+    /// The slides controls the speed of the playback for the earthquakes animation
+    void OnSliderUpdate(float value);
+
+
+    /// The animation gets updated inside this function.
+    void UpdateSimulation(double dt);
+
+    /// Initializes NanoGUI widgets
+    void InitNanoGUI();
+
+    /// The models and textures get initialized in this function.
+    void InitOpenGL();
+
+    /// The earth and earthquake spheres get drawn in this function.
+    void DrawUsingOpenGL();
+    
+private:
+    // controls playback
+    double current_time_;
+    double playback_scale_;
+
+    // true if drawing debugging info for the mesh
+    bool debug_mode_;
+    
+    // Database through which you can access the earthquakes
+    EarthquakeDatabase quake_db_;
+
+    // Object for rendering textured earth geometry
+    Earth earth_;
+    
+    // Background image
+    Texture2D stars_tex_;
+
+    // Sets up the computer graphics camera
+    Matrix4 view_matrix_;
+    Matrix4 proj_matrix_;
+    
+    // Gui elements
+    nanogui::Button  *globe_btn_;
+    nanogui::Label   *date_label_;
+    nanogui::TextBox *speed_box_;
+    
+    // A list of paths to search for data files (images and shaders)
+    std::vector<std::string> search_path_;
+    
+    // Used to draw a background texture, you can also use this to draw the
+    // earthquakes if you want.
+    QuickShapes quick_shapes_;
+};
+
+#endif
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