feat: unlock pterodactyl hazards after score threshold and duck avoidance

js/game.js

@@ -32,6 +32,8 @@ const state = {
     { x: 2600, y: groundY - 20, width: 22, height: 20, vx: -80, alive: true },
     { x: 3400, y: groundY - 20, width: 22, height: 20, vx: -75, alive: true }
   ],
+  pterodactyls: [],
+  pteroSpawnTimer: 0,
   player: {
     x: 160,
     y: 0,
@@ -98,6 +100,17 @@ function drawAnts() {
   }
 }
 
+function drawPterodactyls() {
+  ctx.fillStyle = '#6e5a8a';
+  for (const p of state.pterodactyls) {
+    const sx = p.x - state.cameraX;
+    if (sx + p.width < 0 || sx > canvas.width) continue;
+    ctx.fillRect(sx, p.y, p.width, p.height);
+    ctx.fillRect(sx - 8, p.y + 6, 8, 4);
+    ctx.fillRect(sx + p.width, p.y + 6, 8, 4);
+  }
+}
+
 function intersects(a, b) {
   return a.x < b.x + b.width && a.x + a.width > b.x && a.y < b.y + b.height && a.y + a.height > b.y;
 }
@@ -150,6 +163,32 @@ function updateAnts(dt) {
   }
 }
 
+function updatePterodactyls(dt) {
+  if (state.score <= 100) return;
+
+  state.pteroSpawnTimer -= dt;
+  if (state.pteroSpawnTimer <= 0) {
+    const altitude = groundY - (state.player.standingHeight - 24);
+    state.pterodactyls.push({
+      x: state.cameraX + canvas.width + 80,
+      y: altitude,
+      width: 54,
+      height: 26,
+      vx: -280
+    });
+    state.pteroSpawnTimer = 2.2;
+  }
+
+  const p = state.player;
+  for (const flyer of state.pterodactyls) {
+    flyer.x += flyer.vx * dt;
+    if (intersects(p, flyer)) {
+      applyHit('Pterodactyl collision. Duck next time!');
+    }
+  }
+  state.pterodactyls = state.pterodactyls.filter((f) => f.x + f.width > state.cameraX - 150);
+}
+
 function updatePlayer(dt) {
   const p = state.player;
   let move = 0;
@@ -213,11 +252,13 @@ function tick(ts) {
     state.hitCooldown = Math.max(0, state.hitCooldown - dt);
     updatePlayer(dt);
     updateAnts(dt);
+    updatePterodactyls(dt);
   }
 
   ctx.clearRect(0, 0, canvas.width, canvas.height);
   drawBackground();
   drawAnts();
+  drawPterodactyls();
   drawTRex(state.player);
   drawDeathText();