Creation of a Flash artillery game using Box2D – part 2: removing bullets

核心提示：This is the second part of Creation of a Flash artillery game using Box2D… one reader asked for a function to make blocks (bullets) disappear after 10 se

This is the second part of Creation of a Flash artillery game using Box2D… one reader asked for a function to make blocks (bullets) disappear after 10 seconds or any given time.

I found the question interesting, and here I am writing something about removing bullets.

To introduce timed bullets, I only need another class to keep track of passed time and pass a flag to the main class when the bullet “gets old”.

This is the new class called bullet.as

package　{
　import　flash.display.Sprite;
　import　flash.utils.Timer;
　import　flash.events.TimerEvent;
　public　class　bullet　extends　Sprite　{
　　//　setting　the　time　to　10,000　milliseconds　=　10　seconds
　　public　var　time_count:Timer=new　Timer(10000);
　　//　flag　to　determine　if　I　have　to　remove　the　bullet
　　public　var　remove_the_bullet=false;
　　public　function　bullet()　{
　　　//　simple　time　listener
　　　time_count.addEventListener(TimerEvent.TIMER,　bullet_is_old);
　　　time_count.start();
　　}
　　public　function　bullet_is_old(event:TimerEvent)　{
　　　//　removing　the　time　listener
　　　time_count.removeEventListener(TimerEvent.TIMER,　bullet_is_old);
　　　//　setting　the　flag　to　true
　　　remove_the_bullet=true;
　　}
　　public　function　has_to_be_removed():Boolean　{
　　　//　returning　the　flag,　this　is　the　method　I'll　call　from　the　main　class
　　　return　(remove_the_bullet);
　　}
　}
}