Can now use keys to move around.

fenscaster.cpp

@@ -168,7 +168,27 @@ int main() {
     float x = player_x;
     float y = player_y;
 
-    player_angle -= 0.01;
+    if(window.key('Q')) {
+      player_angle -= 0.1;
+    } else if(window.key('E')) {
+      player_angle += 0.1;
+    }
+
+    if(window.key('W')) {
+      x += -1 * std::sin(player_angle) * 5;
+      y += std::cos(player_angle) * 5;
+    } else if(window.key('S')) {
+      x -= -1 * std::sin(player_angle) * 5;
+      y -= std::cos(player_angle) * 5;
+    }
+
+    if(window.key('D')) {
+      x += -1 * std::sin(player_angle + std::numbers::pi * 0.5) * 5;
+      y += std::cos(player_angle + std::numbers::pi * 0.5) * 5;
+    } else if(window.key('A')) {
+      x -= -1 * std::sin(player_angle + std::numbers::pi * 0.5) * 5;
+      y -= std::cos(player_angle + std::numbers::pi * 0.5) * 5;
+    }
 
     if(!collision(x, y)) {
       player_x = x;