add subprojects

1 files changed, 45 insertions, 0 deletions

diff --git a/centipede/js/game/objects/spider.js b/centipede/js/game/objects/spider.js
new file mode 100644
index 0000000..732c0a3
--- /dev/null
+++ b/centipede/js/game/objects/spider.js
@@ -0,0 +1,45 @@
+game.Spider = (spec) => {
+  const object = game.Object(spec);
+
+  const parentUpdate = object.update; 
+  
+  object.randomizeVel = () => {
+    object.dx = Math.min(Math.random(), 0.25 + 0.05*game.level) * (Math.random() > 0.5 ? 1 : -1);
+    object.dy = Math.min(Math.random(), 0.25 + 0.05*game.level) * (Math.random() > 0.5 ? 1 : -1);
+  }
+
+  object.update = (elapsedTime) => {
+    if (Math.random() < 0.01*game.level) {
+      object.randomizeVel();
+    }
+    if (object.x < 0 || object.x > game.width - object.width) {
+      object.dx = -object.dx;
+    }
+    if (object.y < 0 || object.y > game.height - object.height) {
+      object.dy = -object.dy;
+    }
+    object.x = Math.max(0, Math.min(game.width - object.width, object.x));
+    object.y = Math.max(0, Math.min(game.height - object.height, object.y));
+    parentUpdate(elapsedTime);
+  };
+
+  object.explode = () => {
+    game.explosions.push(game.Explosion({x: object.x, y: object.y, width: object.width, height: object.height, sprite: game.sprites.explosionBig}));
+    game.sounds.enemy_hit.load();
+    game.sounds.enemy_hit.play();
+  }  
+
+  object.onBulletCollision = (bullet) => {
+    game.score += 150;
+    object.alive = false;
+    object.explode();
+  }
+
+  object.onPlayerCollision = (player) => {
+    object.alive = false;
+    player.kill();
+    object.explode();
+  }
+
+  return object;
+}
\ No newline at end of file