Create a simple Flash game

Tap the power of Flash’s ActionScript capabilities to build a simple game with animated characters.

step11

11. Test your movie: you should see an evil bubble appear on screen every second, travel across the screen and disappear off the left-hand edge of the screen. As it takes more than one second for the travel to happen, it’s possible to have many bubbles on screen at once. The code we’ve just added controls how often (in frames) a new bubble is created. If you want more, lower the “>30” bit of the code to, say, “>20”. If you want fewer, increase that number.

step12

12. We’re going to add some collision detection to the bubbles. When they hit Madame Octopus, we want to end the game (the aim being to avoid the bubbles for as long as possible). To do this, we need to first give MO an instance name so we can refer to her from the bubble class. Click on the Madam Octopus then enter an instance name of ‘octopus’ in the Properties panel.

step13

13. Create a new symbol (Insert > New Symbol), drag it onto the stage and give it an instance name of endGamePanel. Inside the endGamePanel, create a ‘Game Over’ screen to suit (or check out our version). Set the alpha property of your symbol to 0. Create a new layer in your main timeline. Name it actions, then add the following code, or copy and paste it from the cover CD file Step 13a: Var tmpscore = 0; var playing = true; function endGame() { playing = false; _root.endGamePanel._alpha = 100; } Edit EB.as and enter the code below inside the onEnterFrame function, or copy and paste it from file Step 13b on the cover CD. This uses the built-in hitTest function to check if a bubble is touching MO. If it is, the bubble is removed and the endGame() function is called: if(this.hitTest(_root.octopus)) { this.removeMovieClip(); _root.endGame(); }

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Sam Hampton-Smith

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