This is the forth part of the development of a Space Shooter game. In this tutorial we will add lives, scores and game over to our game.
Let's start with score.
Open the main timeline code and add this variable:
| var score = 0; |
Now open the Bullet's code and add this:
| this.onEnterFrame = function() { this._x += 9; if (this._x > 550) { this.removeMovieClip(); } for (i = 0; i < _root.nrEnemies; i++) { if (this.hitTest(_root["Enemy" + i])) { _root["Enemy" + i].reset(); _root.score += 10; this.removeMovieClip(); } } } |
This is the code we used before to know if a bullet hits an enemy, so we can put the score for killing an enemy there.
If you want the player to lose points for getting killed, just add _root.score -= PointsToLose to the code that checks if the player was killed.
The score is done; we just need to show the player his score.
To do that, select the Text Tool and draw it on the stage.
Write "Score:"
Now draw another Text box on the stage. Select this new Text box and change these properties:
Run the game and see how it works.
Now let's make our ship have lives. Add another variable in the main code:
| var lives = 3; |
And make these changes in the code that checks if the player crashed with an enemy:
| if (this.hitTest(_root["Enemy" + i])) { _root.lives -= 1; reset() for(k = 0; k < _root.nrEnemies; k++) { _root["Enemy" + k].reset(); } } |
Draw two text boxes again:
We can see the ship losing lives now, but nothing happens when it goes lower than zero.
To change that we tell the player when its game over. Create a new movie clip.
Write "Game Over" using the text tool and go back to the main timeline.
You will see something like this:
Add this to the Ship's code:
| if (this.hitTest(_root["Enemy" + i])) { _root.lives -= 1; if (_root.lives <= 0) { _root.attachMovie("GameOver", "GameOver", 100) _root.GameOver._x = 275 _root.GameOver._y = 150 this.swapDepths(10); this.removeMovieClip(); } reset() for(k = 0; k < _root.nrEnemies; k++) { _root["Enemy" + k].reset(); } } |
f the player's lives are over, we attach the "Game Over" MC and set its position.
| this.swapDepths(10); this.removeMovieClip(); |
ere we are removing the Ship MC, but first we use the function swapDepths(depth) because we placed this MC manually on stage, so we need to set a new depth before deleting it.
Try dying now... =)
The last tutorial will be about sound effects and a pause key. Then our game is finished.
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it looks like this Operator '=' must be followed by an operand now this happened when i pasted the actionscript for the bullets
can you help me out?
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