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POMaking falling objects come at random angles in AS3
 

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  1. POMaking falling objects come at random angles in AS3
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    <p>I am making a missile defense type of game and am trying to get the missiles to fall at random angles. I also need the bullet image to turn at the angle I am shooting at. I am very unfamiliar with angles in AS3 so I need some help.</p> <p>Code: <pre><code> import spark.components.Image; public var missiles:Array; public var bullets:Array; public var playerLife:Number; public var targetX:Number; public var targetY:Number; public function init():void { startGame(); } public function onEnterFrame(e:Event):void { if(Math.random() &lt;.05 ){ //make a new missle var newMissile:Image = new Image(); //draw to is newMissile.source = "assets/missileDown.jpg"; //position it newMissile.x = Math.random() * stage.stageWidth; //animate it newMissile.addEventListener(Event.ENTER_FRAME, onMissileEnterFrame); //add it to missle array missiles.push(newMissile); //add it to the screen gameGroup.addElement(newMissile); } } public function startGame():void { //makes new arrays //gets rid of old arrays missiles = new Array(); bullets = new Array(); //set player life playerLife = 5; //show player life playerHealth.text = String(playerLife); //add animation and mouse interation this.addEventListener(Event.ENTER_FRAME, onEnterFrame); stage.addEventListener(MouseEvent.CLICK, fireWeapon); //set game over alpha gameEnd.alpha = 0; reset.alpha = 0; //set game start alpha playerHealth.alpha = 1; healthLabel.alpha = 1; } //updates the missle public function onMissileEnterFrame(e:Event):void { //reference to target var targetMissile:Image = Image(e.currentTarget); //move missle down targetMissile.y += 10; //if missle has gone too far, remove it and player loses life if(targetMissile.y &gt; stage.stageHeight) { playerLife --; removeMissile(targetMissile); //show player life playerHealth.text = String(playerLife); } //if player is dead, game over if(playerLife &lt;= 0) { gameOver(); } } //update bullet public function onBulletEnterFrame(e:Event):void { //get reference to bullet var thisBullet:Bullet = Bullet(e.currentTarget); //animate towards point.. //calculate difference between current position and desired position var diffX:Number = thisBullet.targX - thisBullet.x; var diffY:Number = thisBullet.targY - thisBullet.y; //move 10% of difference closer thisBullet.x += diffX * .1; thisBullet.y += diffY * .1; //chekc for overlap between bullet and missles for(var i:Number = 0; i &lt; missiles.length; i++) { //if they do overlap, remove missle if( thisBullet.hitTestObject(missiles[i]) ) { removeMissile(missiles[i]); removeBullet(thisBullet); break; } } //if we're 'close enough' to the target position, remove bullet if(Math.abs(diffX) &lt; 10 &amp;&amp; Math.abs(diffY) &lt; 10) { removeBullet(thisBullet); } } //gets rid of a missle public function removeMissile(targetMissile:Image):void { //removes the missle from the missiles array for(var i:Number = missiles.length - 1; i &gt;= 0; i--) { if(missiles[i] == targetMissile) { missiles.splice(i,1); break; } } //don't animate anymore targetMissile.removeEventListener(Event.ENTER_FRAME, onMissileEnterFrame); //remove from stage gameGroup.removeElement(targetMissile); } //removes bullet from stage public function removeBullet(targetBullet:Bullet):void { //stop animation targetBullet.removeEventListener(Event.ENTER_FRAME, onBulletEnterFrame); //remove from stage gameGroup.removeElement(targetBullet); } //shoot a bullet at the mouse position public function fireWeapon(e:MouseEvent):void { //make a new bullet var newBullet:Bullet = new Bullet(); newBullet.addEventListener(Event.ENTER_FRAME, onBulletEnterFrame); //position near the earth in the center var halfStage:Number = stage.stageWidth / 2; newBullet.x = halfStage; newBullet.y = 500; //set target newBullet.targX = stage.mouseX; newBullet.targY = stage.mouseY; //add it to the stage gameGroup.addElement(newBullet); } //you lose public function gameOver():void { //remove missles for(var i:Number = 0; i &lt; missiles.length; i++) { removeMissile(missiles[i]); } //stop interaction stage.removeEventListener(MouseEvent.CLICK, fireWeapon); //stop animation this.removeEventListener(Event.ENTER_FRAME, onEnterFrame); //set game start alpha playerHealth.alpha = 0; healthLabel.alpha = 0; //set game end alpha gameEnd.alpha = 1; reset.alpha = 1; } ]]&gt; &lt;/fx:Script&gt; </code></pre>
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    1. USGabe Dougherty
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