implement pheromone type

src/pheromone.cpp

@@ -0,0 +1,39 @@
+//
+// Created by christoph on 11.04.21.
+//
+
+#include <SFML/Graphics.hpp>
+#include "world_object.hpp"
+#include "pheromone.hpp"
+
+Pheromone::Pheromone(double x, double y, PheroType type)
+        : WorldObject(x, y, 2, sf::Color::Transparent) {
+    if (type == HOME) {
+        appearance.setFillColor(sf::Color::Red);
+    } else if (type == FOOD) {
+        appearance.setFillColor(sf::Color::Green);
+    } else {
+        appearance.setFillColor(sf::Color::Transparent);
+    }
+}
+
+PheroType Pheromone::getPheromoneType() const {
+    if (appearance.getFillColor() == sf::Color::Red) {
+        return HOME;
+    }
+    if (appearance.getFillColor() == sf::Color::Green) {
+        return FOOD;
+    }
+    return NONE;
+}
+
+void Pheromone::update() {
+    intensity = std::max(0, intensity - decay);
+    appearance.setFillColor(sf::Color(
+            appearance.getFillColor().r,
+            appearance.getFillColor().g,
+            appearance.getFillColor().b,
+            intensity
+    ));
+}
+

src/pheromone.hpp

@@ -0,0 +1,25 @@
+//
+// Created by christoph on 11.04.21.
+//
+
+#ifndef ANTSIMULATOR_PHEROMONE_HPP
+#define ANTSIMULATOR_PHEROMONE_HPP
+
+#include <SFML/Graphics.hpp>
+#include "world_object.hpp"
+
+const unsigned short decay = 1;
+
+class Pheromone : public WorldObject
+{
+public:
+    unsigned short intensity = 255;
+
+public:
+    Pheromone(double x, double y, PheroType type);
+
+    PheroType getPheromoneType() const override;
+    void update() override;
+};
+
+#endif //ANTSIMULATOR_PHEROMONE_HPP