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| Learn about vectors as you create an array of cannonballs that can be launched by the player's cannon and fly across the game screen. |
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Step 1 |
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| Add new variables to your GameObject class to allow for objects that have velocity and that can toggle between alive and dead modes. |
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Step 2 |
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| Create and initialize an array of new cannonball GameObjects that can be fired by the player. |
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Step 3 |
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| Draft a new UpdateCannonBalls method that will move the cannonballs across the screen when fired. |
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Step 4 |
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Create a FireCannonBall method that will use the rotation of the cannon to fire a cannonball at the proper position and velocity.
Note: See the update for this step to fix a known problem. |
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Step 5 |
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| Modify the UpdateCannonBalls method to "kill" cannonballs that go outside of the screen bounds, to allow the player to fire more. |
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Step 6 |
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| Draw the cannonballs on screen inside the Draw call, so the player can see them when they are fired. |
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Download source code