chore: Add course material

397/Ex21/Light.cpp

@@ -0,0 +1,19 @@
+#include "Light.h"
+#include "Pelican.h"
+#include "Screen.h"
+#include <iostream>
+
+Light::Light(std::string name, int x, int y, int color) : x(x), y(y), c(color), name(name) {}
+
+Light::~Light() {
+    std::cout << "Deleting light (" << name << ", " << x << ", " << y << ", " << c << ")"
+              << "\n";
+}
+
+void Light::set(LightState newState) {
+    state = newState;
+    Screen::write(name.c_str(), x, y, state == FLASH ? (128 + c) : (state == OFF ? 0 : c));
+    // 128 + color was used to make a character flash (but not any more)
+}
+
+Light::LightState Light::get(void) { return state; }