XNA Creators Club Online - beginner's guide 2d: chapter 7


	beginner's guide

2D Lessons

	1	Introducing the 2D Tutorial
	2	Creating the Game Project
	3	Adding Assets
	4	Drawing the Background
	5	Creating a Cannon
	6	Firing Cannonballs
	7	Adding Enemies
	8	Destroying Enemies
	9	Keeping Score
	x	Extra Credit - Community Tutorials

7. Adding Enemies

Use a random number generator and a bit of math to create enemy UFOs that appear in random locations and fly across the screen.

Step 1

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Create and initialize an array of enemy GameObjects, and declare constants to use when randomly placing the enemies.

Step 2

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Create an UpdateEnemies method that moves enemies across the screen and "kills" enemies that leave the screen.

Step 3

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Add on to the UpdateEnemies method to regenerate enemies that have died, placing them randomly on the screen.

Step 4

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Modify the Draw call to draw the enemy UFOs on the screen.