Added Assignment 3 worksheet and code

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diff --git a/dev/a3-earthquake/quake_app.cc b/dev/a3-earthquake/quake_app.cc
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+/** CSci-4611 Assignment 3:  Earthquake
+ */
+
+#include "quake_app.h"
+#include "config.h"
+
+#include <iostream>
+#include <sstream>
+
+// Number of seconds in 1 year (approx.)
+const int PLAYBACK_WINDOW = 12 * 28 * 24 * 60 * 60;
+
+using namespace std;
+
+QuakeApp::QuakeApp() : GraphicsApp(1280,720, "Earthquake"),
+    playback_scale_(15000000.0), debug_mode_(false)
+{
+    // Define a search path for finding data files (images and earthquake db)
+    search_path_.push_back(".");
+    search_path_.push_back("./data");
+    search_path_.push_back(DATA_DIR_INSTALL);
+    search_path_.push_back(DATA_DIR_BUILD);
+    
+    quake_db_ = EarthquakeDatabase(Platform::FindFile("earthquakes.txt", search_path_));
+    current_time_ = quake_db_.earthquake(quake_db_.min_index()).date().ToSeconds();
+
+ }
+
+
+QuakeApp::~QuakeApp() {
+}
+
+
+void QuakeApp::InitNanoGUI() {
+    // Setup the GUI window
+    nanogui::Window *window = new nanogui::Window(screen(), "Earthquake Controls");
+    window->setPosition(Eigen::Vector2i(10, 10));
+    window->setSize(Eigen::Vector2i(400,200));
+    window->setLayout(new nanogui::GroupLayout());
+    
+    date_label_ = new nanogui::Label(window, "Current Date: MM/DD/YYYY", "sans-bold");
+    
+    globe_btn_ = new nanogui::Button(window, "Globe");
+    globe_btn_->setCallback(std::bind(&QuakeApp::OnGlobeBtnPressed, this));
+    globe_btn_->setTooltip("Toggle between map and globe.");
+    
+    new nanogui::Label(window, "Playback Speed", "sans-bold");
+    
+    nanogui::Widget *panel = new nanogui::Widget(window);
+    panel->setLayout(new nanogui::BoxLayout(nanogui::Orientation::Horizontal,
+                                            nanogui::Alignment::Middle, 0, 20));
+    
+    nanogui::Slider *slider = new nanogui::Slider(panel);
+    slider->setValue(0.5f);
+    slider->setFixedWidth(120);
+    
+    speed_box_ = new nanogui::TextBox(panel);
+    speed_box_->setFixedSize(Eigen::Vector2i(60, 25));
+    speed_box_->setValue("50");
+    speed_box_->setUnits("%");
+    slider->setCallback(std::bind(&QuakeApp::OnSliderUpdate, this, std::placeholders::_1));
+    speed_box_->setFixedSize(Eigen::Vector2i(60,25));
+    speed_box_->setFontSize(20);
+    speed_box_->setAlignment(nanogui::TextBox::Alignment::Right);
+    
+    nanogui::Button* debug_btn = new nanogui::Button(window, "Toggle Debug Mode");
+    debug_btn->setCallback(std::bind(&QuakeApp::OnDebugBtnPressed, this));
+    debug_btn->setTooltip("Toggle displaying mesh triangles and normals (can be slow)");
+    
+    screen()->performLayout();
+}
+
+void QuakeApp::OnLeftMouseDrag(const Point2 &pos, const Vector2 &delta) {
+    // Optional: In our demo, we adjust the tilt of the globe here when the
+    // mouse is dragged up/down on the screen.
+}
+
+
+void QuakeApp::OnGlobeBtnPressed() {
+    // TODO: This is where you can switch between flat earth mode and globe mode
+}
+
+void QuakeApp::OnDebugBtnPressed() {
+    debug_mode_ = !debug_mode_;
+}
+
+void QuakeApp::OnSliderUpdate(float value) {
+    speed_box_->setValue(std::to_string((int) (value * 100)));
+    playback_scale_ = 30000000.0*value;
+}
+
+
+void QuakeApp::UpdateSimulation(double dt)  {
+    // Advance the current time and loop back to the start if time is past the last earthquake
+    current_time_ += playback_scale_ * dt;
+    if (current_time_ > quake_db_.earthquake(quake_db_.max_index()).date().ToSeconds()) {
+        current_time_ = quake_db_.earthquake(quake_db_.min_index()).date().ToSeconds();
+    }
+    if (current_time_ < quake_db_.earthquake(quake_db_.min_index()).date().ToSeconds()) {
+        current_time_ = quake_db_.earthquake(quake_db_.max_index()).date().ToSeconds();
+    }
+    
+    Date d(current_time_);
+    stringstream s;
+    s << "Current date: " << d.month()
+        << "/" << d.day()
+        << "/" << d.year();
+    date_label_->setCaption(s.str());
+    
+    // TODO: Any animation, morphing, rotation of the earth, or other things that should
+    // be updated once each frame would go here.
+}
+
+
+void QuakeApp::InitOpenGL() {
+    // Set up the camera in a good position to see the entire earth in either mode
+    proj_matrix_ = Matrix4::Perspective(60.0f, aspect_ratio(), 0.1f, 50.0f);
+    view_matrix_ = Matrix4::LookAt(Point3(0,0,3.5), Point3(0,0,0), Vector3(0,1,0));
+    glClearColor(0.0, 0.0, 0.0, 1);
+    
+    // Initialize the earth object
+    earth_.Init(search_path_);
+
+    // Initialize the texture used for the background image
+    stars_tex_.InitFromFile(Platform::FindFile("iss006e40544.png", search_path_));
+}
+
+
+void QuakeApp::DrawUsingOpenGL() {
+    quick_shapes_.DrawFullscreenTexture(Color(1,1,1), stars_tex_);
+    
+    // You can leave this as the identity matrix and we will have a fine view of
+    // the earth.  If you want to add any rotation or other animation of the
+    // earth, the model_matrix is where you would apply that.
+    Matrix4 model_matrix;
+    
+    // Draw the earth
+    earth_.Draw(model_matrix, view_matrix_, proj_matrix_);
+    if (debug_mode_) {
+        earth_.DrawDebugInfo(model_matrix, view_matrix_, proj_matrix_);
+    }
+
+    // TODO: You'll also need to draw the earthquakes.  It's up to you exactly
+    // how you wish to do that.
+
+}
+
+
+
+