Take a closer look at bullets.

Create a Bullet class.

You will need to create a class that describes a bullet. Remember that a bullet is simply a small sprite that will be moving forward at a set speed. Consider what information the bullet will need at the time of creation. Then think about whether this info will be different for each bullet and needs to be passed to the constructor.

Define Bullet’s update method.

Considering that when a bullet is created it simply moves mindlessly upward, the Bullet's update method will need to cause this behavior by affecting the rect appropriately.

Create a bullet object.

To create a bullet, you will need to call the Bullet's constructor. Be sure to give the constructor any information it needs to create the bullet. At this point, simply have the ship indiscriminantly fire bullets all the time.

Create key detection for the firing of a bullet.

You will need to consider which key will be the trigger event for the creation of a bullet. Then, you will need to detect that event and call the Bullet class' constructor.

Slow down the firing of the bullets to 6 per second.

You will need to cause the firing of the bullet be limited by a timer that is modulo'ed by a certain value. Consider how often the bullet is being created and modulo the timer by an amount that results in 6 bullets going off every second.

Create a Huey class.

You will be creating a class similar to the ship that will be controlled remotely via code. When thinking about what type of instance variables the Huey class will need, refer to your ship. Remember that any information that will be different for each object needs to be passed into the constructor.

Create a huey object at the top of your screen.

You will need to set the huey's rect values such that it appears at the top of the visible screen when the game starts.

Cause the huey to shoot a bullet downward every 2 seconds

You will need to have the Huey class's update method create a bullet that is based on a condition involving a timer and the modulo operator.

Cause the huey to shoot a second bullet that travels to the right.

A second bullet will need to be created, however now, the bullet will not simply shoot downward. Now the bullet will have a direction. You will need to update the Bullet class so that it can take in that information and travel accordingly. To accomplish this task, you will need to use sin and cos to calculate the amount the bullet needs to travel on the x and y axis.

Have the huey start at (WIN_W/2, -huey.height) and fly downward a few inches before stopping.

To accomplish this, you will need to have the huey move downward until a timer lets the huey know 2 seconds has passed. At this point, you will need to cause the huey to stop.

Cause the huey to be destroyed when it absorbes an appropriate amount of bullets.

The Huey class will need to be modified so that it has an energy instance variable. This variable will be decremented when the Huey touches a bullet and when the energy reaches 0, remove the huey from the group.

Cause the ship to be destroyed when it absorbs a shot from an enemy.

You will need to check for a collision between the ship and an enemy's bullet. If there is a collision, the ship is removed from the group and the game ends.