refactoring datastructures;

Display.cpp

@@ -7,9 +7,7 @@
 #include "Point.h"
 #include "Utility.h"
 
-#define RADIUS 10.f
-
-Display::Display()
+Display::Display (const std::vector<Point> &pts)
 {
     if (!m_font.loadFromFile("arial.ttf"))
     {
@@ -21,26 +19,32 @@ Display::Display()
     m_textStatus.setString("initializing...");
     m_textStatus.setCharacterSize(12);
     m_textStatus.setFillColor(sf::Color::Black);
-}
 
-void Display::drawPoint(sf::RenderWindow& window, size_t index)
-{
-    Point &pt = m_points[index];
-    sf::CircleShape shape(RADIUS);
-    //shape.setOrigin(RADIUS, RADIUS); // handle with origin or manually calc position
-    shape.setPosition(pt.x() - RADIUS, pt.y() - RADIUS);
-    shape.setFillColor(sf::Color::Green);
-    shape.setOutlineThickness(1.f);
-    shape.setOutlineColor(sf::Color::Black);
-    window.draw(shape);
+    size_t points = pts.size();
+    for (size_t i = 0; i < points; ++i)
+    {
+        const Point& pt = pts[i];
+        sf::CircleShape shape(OFFSET);
+        //shape.setPosition(pt.x() - OFFSET, pt.y() - OFFSET); // handle with origin or manually calc position
+        shape.setOrigin(OFFSET, OFFSET);
+        shape.setPosition(pt.x(), pt.y());
+        shape.setFillColor(sf::Color::Green);
+        shape.setOutlineThickness(1.f);
+        shape.setOutlineColor(sf::Color::Black);
+        m_points.push_back(shape);
+        //m_points.append(shape);
 
-    sf::Text label;
-    label.setPosition(pt.x() - RADIUS/2, pt.y() - RADIUS/2 - 3);
-    label.setFont(m_font);
-    label.setString(std::to_string(index));
-    label.setCharacterSize(12);
-    label.setFillColor(sf::Color::Black);
-    window.draw(label);
+        sf::Text label;
+        //label.setPosition(pt.x() - OFFSET / 2, pt.y() - OFFSET / 2 - 3);
+        label.setOrigin(OFFSET / 2 - 1, OFFSET / 2 + 3);
+        label.setPosition(pt.x(), pt.y());
+        label.setFont(m_font);
+        label.setString(std::to_string(i));
+        label.setCharacterSize(12);
+        label.setFillColor(sf::Color::Black);
+        m_labels.push_back(label);
+        //m_points.append(label);
+    }
 }
 
 // multiple options possible:
@@ -53,15 +57,15 @@ void Display::drawPoint(sf::RenderWindow& window, size_t index)
 void Display::show()
 {
     sf::ContextSettings settings;
-    settings.antialiasingLevel = 4;
+    settings.antialiasingLevel = 8;
 
     sf::RenderWindow window(sf::VideoMode(WIDTH, HEIGHT), "ALGO Prog2: Quickhull - visualization", sf::Style::Default, settings);
-    // b)
-    //window.setFramerateLimit(0.2);
+    /* b)
+    window.setFramerateLimit(0.2);
 
-    //sf::Clock clock;
-    //sf::Time timeSinceLastUpdate = sf::Time::Zero;
-    //sf::Time frameTime = sf::seconds(2); //sf::seconds(1.f / 60.f)
+    sf::Clock clock;
+    sf::Time frameTime = sf::seconds(2); //sf::seconds(1.f / 60.f)
+    sf::Time timeSinceLastUpdate = frameTime; //sf::Time::Zero;*/
     while (window.isOpen())
     {
         sf::Event event;
@@ -71,96 +75,176 @@ void Display::show()
                 window.close();
         }
 
-        std::cout << "entering gameloop" << std::endl;
+        // a)
+        //update(elapsed);
+        //render(window);
 
         /* b)
         timeSinceLastUpdate += clock.restart();
         // only handle every few seconds because we need no animations
-        if (timeSinceLastUpdate > frameTime)
+        if (timeSinceLastUpdate >= frameTime)
         {
+            std::cout << "entering update and render" << std::endl;
+
             // start by getting the most left and right point
             timeSinceLastUpdate -= frameTime;
+
+            update();
+            render(window);
         }*/
 
-        // a)
-        //update(elapsed);
-        update();
-
-        window.clear(sf::Color::White);
-
-        // TODO: refactor -> parse into sf::Vertices or Shapes
-        // always print remaining points
-        size_t points = m_points.size();
-        for (size_t i = 0; i < points; ++i)
-        {
-            drawPoint(window, i);
-        }
-
-        // draw already calculated hull
-        //if (step >= 1)
-        {
-            //window.draw(&m_hull[0], m_hull.size(), sf::Lines);
-            window.draw(&m_hull[0], m_hull.getVertexCount(), m_hull.getPrimitiveType());
-        }
-
-        window.draw(m_textStatus);
-
-        window.display();
-
         // c)
         // choose a simple sleep
+        update();
+        render(window);
         std::this_thread::sleep_for(std::chrono::milliseconds(2000));
     }
 }
 
-void Display::update()
+void Display::update ()
 {
     // TODO: maybe include Akl–Toussaint heuristic first?
     // https://en.wikipedia.org/wiki/Convex_hull_algorithms#Akl%E2%80%93Toussaint_heuristic
-    if (m_curStep == 1)
+
+    unsigned int curStep = (m_step > 5) ? ((m_step - 2) % 4 + 2) : (m_step % 6); // skip init and first step after first run
+
+    std::string text = "(" + std::to_string(m_step) + ") step " + std::to_string(curStep) + ": ";
+    if (curStep == 1)
     {
         // first step: select min - max x coordinates
-        m_textStatus.setString("step " + std::to_string(m_curStep) + ": select min - max x coordinates...");
+        m_textStatus.setString(text + "select min - max x coordinates...");
+
+        /* EDIT: manual iteration for combining x and x minmax; also need not previous sorting
         std::pair<Point, Point> minmax = getMinMaxX(m_points);
         std::cout << "min: " << minmax.first.x() << ", " << minmax.first.y() <<
             ", max: " << minmax.second.x() << ", " << minmax.second.y() << std::endl;
 
         m_hull.setPrimitiveType(sf::Lines);
         m_hull.append(sf::Vertex(sf::Vector2f(minmax.first.x(), minmax.first.y()), sf::Color::Blue));
-        m_hull.append(sf::Vertex(sf::Vector2f(minmax.second.x(), minmax.second.y()), sf::Color::Blue));
+        m_hull.append(sf::Vertex(sf::Vector2f(minmax.second.x(), minmax.second.y()), sf::Color::Blue));*/
+
+        // if use Akl–Toussaint heuristic
+        bool useAkl = false;
+        if (useAkl)
+        {
+            sf::Vector2f topLeft(WIDTH, HEIGHT);
+            sf::Vector2f topRight(0, HEIGHT);
+            sf::Vector2f botLeft(WIDTH, 0);
+            sf::Vector2f botRight(0, 0);
+
+            for (auto& pt : m_points)
+            {
+                sf::Vector2f pos = pt.getPosition();
+                float x = pos.x;
+                float y = pos.y;
+                if (x < topLeft.x && y < topLeft.y) topLeft = pos;
+                if (x > topRight.x && y < topLeft.y) topRight = pos;
+                if (x < botLeft.x && y > botLeft.y) botLeft = pos;
+                if (x > botRight.x && y > botRight.y) botRight = pos;
+            }
+
+            /* TODO: use a convex shape? Or build from vertices in render?
+            sf::ConvexShape convex;
+            convex.setPointCount(5);
+            convex.setPoint(0, topLeft);
+            convex.setPoint(0, topRight);
+            convex.setPoint(0, botRight);
+            convex.setPoint(0, botLeft);*/
+
+            //m_hull.setPrimitiveType(sf::Lines);
+            m_hull.setPrimitiveType(sf::LineStrip);
+            m_hull.append(sf::Vertex(topLeft, sf::Color::Blue));
+            m_hull.append(sf::Vertex(topRight, sf::Color::Blue));
+            m_hull.append(sf::Vertex(botRight, sf::Color::Blue));
+            m_hull.append(sf::Vertex(botLeft, sf::Color::Blue));
+            m_hull.append(sf::Vertex(topLeft, sf::Color::Blue));
+        }
+        else
+        {
+            sf::Vector2f left(WIDTH, HEIGHT);
+            sf::Vector2f right(0, 0);
+
+            for (auto& pt : m_points)
+            {
+                sf::Vector2f pos = pt.getPosition();
+                float x = pos.x;
+                float y = pos.y;
+                if (x < left.x) left = pos;
+                if (x > right.x) right = pos;
+            }
+
+            //m_hull.setPrimitiveType(sf::Lines);
+            m_hull.setPrimitiveType(sf::LineStrip);
+            m_hull.append(sf::Vertex(left, sf::Color::Blue));
+            m_hull.append(sf::Vertex(right, sf::Color::Blue));
+        }
     }
-    else if (m_curStep == 2)
+    else if (curStep == 2)
     {
         // second step: split board and find furthest point
-        m_textStatus.setString("step " + std::to_string(m_curStep) + ": split board and find furthest point...");
+        m_textStatus.setString(text + "split board and find furthest point...");
+
+        for (auto& pt : m_points)
+        {
+            sf::Vector2f pos = pt.getPosition();
+            float x = pos.x;
+            float y = pos.y;
+
+            pt.setFillColor(sign(x, y, m_hull[0].position.x, m_hull[0].position.y, m_hull[1].position.x, m_hull[1].position.y) > 0 ? sf::Color::Red : sf::Color::Green);
+        }
     }
-    else if (m_curStep == 3)
+    else if (curStep == 3)
     {
         // third step: draw triangle, remove inner points
-        m_textStatus.setString("step " + std::to_string(m_curStep) + ": draw triangle, remove inner points...");
+        m_textStatus.setString(text + "find furthest point and draw triangle...");
     }
-    else if (m_curStep == 4)
+    else if (curStep == 4)
     {
         // fourth step: remove inner points
-        m_textStatus.setString("step " + std::to_string(m_curStep) + ": remove inner points...");
+        m_textStatus.setString(text + "remove inner points...");
     }
-    else if (m_curStep == 5)
+    else if (curStep == 5)
     {
-        // fourth step: remove inner points
-        m_textStatus.setString("step " + std::to_string(m_curStep) + ": finished calculating convex hull");
-    }
+        // fifth step: adding new hull point
 
-    m_curStep++;
-    // if finished removing inner points and there are still points left -> repeat from step 2
-    // TODO: 
-    if (m_curStep == 5 && m_points.size() > 0)
-    {
-        m_curStep = 2;
-    }
+        // TEMP: TEST check if ends
+        //if (m_step >= 10) m_points.clear();
 
+        if (m_points.size() == 0) m_textStatus.setString(text + "finished calculating convex hull");
+        else m_textStatus.setString(text + "adding new hull point...");
+    }
+    else m_textStatus.setString(text + "invalid status!");
+
+    if (curStep != 5 || m_points.size() > 0) m_step++;
 }
 
-void Display::setData(std::vector<Point> pts)
+void Display::render (sf::RenderWindow &window)
 {
-    m_points = pts;
+    window.clear(sf::Color::White);
+
+    // always print remaining points
+    /*size_t points = m_points.size();
+    for (size_t i = 0; i < points; ++i)
+    {
+        drawPoint(window, i);
+    }*/
+
+    //for (auto& pt : m_points) // points and labels should have the same size -> combine in one loop
+    size_t points = m_points.size();
+    for (size_t i = 0; i < points; ++i)
+    {
+        window.draw(m_points[i]);
+        window.draw(m_labels[i]);
+    }
+
+    // draw already calculated hull
+    //if (step >= 1)
+    {
+        //window.draw(&m_hull[0], m_hull.size(), sf::Lines);
+        window.draw(&m_hull[0], m_hull.getVertexCount(), m_hull.getPrimitiveType());
+    }
+
+    window.draw(m_textStatus);
+
+    window.display();
 }

Display.h

@@ -8,7 +8,7 @@
 
 class Point;
 
-#define OFFSET 10
+#define OFFSET 10.f
 #define WIDTH 800
 #define HEIGHT 600
 
@@ -18,20 +18,22 @@ private:
     sf::Font m_font;
     sf::Text m_textStatus;
 
-    std::vector<Point> m_points;
+    //std::vector<Point> m_points;
+    std::vector<sf::CircleShape> m_points;
+    std::vector<sf::Text> m_labels;
+    //sf::VertexArray m_points;
+    //sf::VertexArray m_labels;
+
     //std::vector<sf::Vertex> m_hull;
     sf::VertexArray m_hull;
 
-    void drawPoint(sf::RenderWindow &, size_t);
-
-    int m_curStep = 0;
+    unsigned int m_step = 0;
     void update();
+    void render(sf::RenderWindow &);
 
 public:
-    Display();
+    Display(const std::vector<Point> &);
 
     void show();
-
-    void setData (std::vector<Point>);
 };
 #endif // DISPLAY_H

Utility.h

@@ -1,6 +1,11 @@
 #pragma once
 #ifndef UTILITY_H
 
+static float sign(float x1, float y1, float x2, float y2, float x3, float y3)
+{
+    return (x1 - x3) * (y2 - y3) - (x2 - x3) * (y1 - y3);
+}
+
 static float sign (Point &p1, Point &p2, Point &p3)
 {
     return (p1.x() - p3.x()) * (p2.y() - p3.y()) - (p2.x() - p3.x()) * (p1.y() - p3.y());

main.cpp

@@ -42,10 +42,32 @@ int main (int argc, char **argv)
         std::cout << "generating random numbers..." << std::endl;
         //srand(static_cast <unsigned> (time(0)));
         srand(static_cast <unsigned> (0)); // fixed seed for testing
+
+        // 2) rectangle
+        //float diff = (2.f * HEIGHT / valCount);
+
+        // 3) circle
+        //float rad = HEIGHT / 2; //8.0f;
+        //float deg = (float)(2 * 3.14159 / valCount);
+
+        float x = 0;
+        float y = 0;
         for (int i = 0; i < valCount; ++i)
         {
-            float x = OFFSET + static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / (WIDTH - OFFSET)));
-            float y = OFFSET + static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / (HEIGHT - OFFSET)));
+            // 1) random generation
+            //x = OFFSET + static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / (WIDTH - OFFSET)));
+            //y = OFFSET + static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / (HEIGHT - OFFSET)));
+            x = OFFSET + static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / (WIDTH - 2*OFFSET)));
+            y = OFFSET + static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / (HEIGHT - 2*OFFSET)));
+
+            // 2) rectangle
+            //x = (i%2 == 0) ? OFFSET : WIDTH - OFFSET;
+            //y = diff/2 + (i/2) * diff;
+
+            // 3) position in circle around center, x/y plane
+            //x = WIDTH/2 + rad * cosf(i * deg);
+            //y = HEIGHT/2 + rad * sinf(i * deg);
+
             points.push_back(Point(x, y));
         }
     }
@@ -78,7 +100,7 @@ int main (int argc, char **argv)
     }
 
     // TODO: sort here, once and for all? xD
-    sortPoints(points);
+    //sortPoints(points);
     for (Point& pt : points)
     {
         std::cout << "pt: " << pt.x() << ", " << pt.y() << std::endl;
@@ -86,13 +108,10 @@ int main (int argc, char **argv)
 
     if (vis)
     {
-        // TODO: use data as ctor argument? pointer?
-
         // TEST to check SFML coordinate system
-        points.push_back(Point(0, 0));
+        //points.push_back(Point(0, 0));
 
-        Display display;
-        display.setData(points);
+        Display display(points);
         display.show();
     }