Advanced Object-oriented programming
A snake game in 3 different languages: Java, Smalltalk and Eiffel Click for demo
Protocol
The game consists of these artifacts:
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Snake: has properties such as speed (default 100, min 50, max 550), health level(default 100) and length(default 1)
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Food(only 1 artifact at the same time, shows up as long as it is not eaten): makes the snake grow and increases its health level and speed
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Poison(max 3 artifacts at the same time, shows up for 10 seconds): decreases the health level or speed of a snake
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Power-up(max 2 artifacts at the same time, shows up for 10 seconds): increases the health level or speed of a snake for 10 seconds
The following tables lists all possible situations that can occur during the game:
| Situation | Length | Health | Speed | Effect |
|---|---|---|---|---|
| Snake eats food | +1 | +50 | +30 | forever |
| Snake eats poison | doesn't change | -30 | or -50 | forever |
| Snake eats power-up | doesn't change | +100 | or +50 | 10 seconds |
| Snake bites itself | 0 | 0 | doesn't change | forever |
| Snake A bites snake B | A: doesn't change; B: -index_where_bitten (the tail falls of) | A: +10; B: doesn't change | A: +10; B: -((A.length/B.length) * 10) | A: 5 seconds; B: forever |
| Snakes collides with border | 0 | 0 | doesn't change | forever |
A snakes loses (because of eating poison, biting itself, getting bitten by another snake, colliding with the borders or because the time is up) if
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health<=0
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length = 0
The winner is elected as follows:
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If only one snake remains on the field, it is elected automatically as the winner of the game else
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The duration of the game is 2 minutes. The winner is the longest snake on the field else
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If some snakes are tied regarding their length, then it is a draw