Add living ASCII universe simulation

CPP/livingAsciiUniverse.cpp

@@ -0,0 +1,108 @@
+#include <iostream>
+#include <vector>
+#include <chrono>
+#include <thread>
+#include <cmath>
+#include <algorithm>
+#include <cstdlib>
+
+using namespace std;
+
+const int WIDTH = 80;
+const int HEIGHT = 25;
+const int MAX_AGE = 50;
+
+struct Star {
+    float x, y;
+    float vx, vy;
+    int age;
+    char symbol;
+};
+
+float randf(float min, float max) {
+    return min + static_cast<float>(rand()) / RAND_MAX * (max - min);
+}
+
+char brightness(int age) {
+    if (age < 10) return '.';
+    if (age < 25) return '*';
+    if (age < 40) return 'O';
+    return '@';
+}
+
+int main() {
+    srand(static_cast<unsigned>(time(nullptr)));
+    vector<Star> stars;
+
+    while (true) {
+        // Occasionally birth a new star
+        if (rand() % 3 == 0) {
+            stars.push_back({
+                randf(0, WIDTH),
+                randf(0, HEIGHT),
+                randf(-0.05f, 0.05f),
+                randf(-0.05f, 0.05f),
+                0,
+                '.'
+            });
+        }
+
+        // Clear screen
+        cout << "\033[2J\033[1;1H";
+
+        char space[HEIGHT][WIDTH];
+        for (int i = 0; i < HEIGHT; i++)
+            for (int j = 0; j < WIDTH; j++)
+                space[i][j] = ' ';
+
+        // Update stars
+        for (auto& s : stars) {
+            s.age++;
+
+            // Simple gravity toward center
+            float cx = WIDTH / 2.0f;
+            float cy = HEIGHT / 2.0f;
+
+            float dx = cx - s.x;
+            float dy = cy - s.y;
+            float dist = sqrt(dx * dx + dy * dy) + 0.01f;
+
+            s.vx += dx / dist * 0.001f;
+            s.vy += dy / dist * 0.001f;
+
+            s.x += s.vx;
+            s.y += s.vy;
+
+            s.symbol = brightness(s.age);
+
+            int ix = static_cast<int>(s.x);
+            int iy = static_cast<int>(s.y);
+
+            if (ix >= 0 && ix < WIDTH && iy >= 0 && iy < HEIGHT) {
+                space[iy][ix] = s.symbol;
+            }
+        }
+
+        // Remove dead stars
+        stars.erase(
+            remove_if(stars.begin(), stars.end(),
+                      [](const Star& s) { return s.age > MAX_AGE; }),
+            stars.end()
+        );
+
+        // Render
+        for (int i = 0; i < HEIGHT; i++) {
+            for (int j = 0; j < WIDTH; j++) {
+                cout << space[i][j];
+            }
+            cout << '\n';
+        }
+
+        cout << "\n🌌 Stars alive: " << stars.size() << endl;
+        cout << "Press Ctrl+C to exit" << endl;
+
+        this_thread::sleep_for(chrono::milliseconds(80));
+    }
+
+    return 0;
+}