implement food

src/food.cpp

@@ -0,0 +1,14 @@
+#include "food.hpp"
+#include "ant.hpp"
+
+Food::Food(double x, double y)
+  : x(x), y(y) {
+  appearance = sf::CircleShape(15);
+  appearance.setFillColor(sf::Color::Green);
+  appearance.setPosition(x - appearance.getRadius(), y - appearance.getRadius());
+}
+
+bool Food::antHasFood(const Ant &ant) const {
+  return ant.x > x - appearance.getRadius() && ant.x < x + appearance.getRadius()
+    && ant.y > y - appearance.getRadius() && ant.y < y + appearance.getRadius();
+}

src/food.hpp

@@ -0,0 +1,20 @@
+#ifndef __FOOD_H_
+#define __FOOD_H_
+
+#include <SFML/Graphics.hpp>
+
+class Ant;
+
+class Food {
+  double x, y;
+
+public:
+  sf::CircleShape appearance;
+
+public:
+  Food(double x, double y);
+
+  bool antHasFood(const Ant& ant) const;
+};
+
+#endif // __FOOD_H_