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POHaving trouble loading an image instead of using a drawn object in actionscript-3
 

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  1. POHaving trouble loading an image instead of using a drawn object in actionscript-3
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    <p>I am trying to make a ball shoot from a canon, which is fine, but i want to change the canon from a drawn canon into an image i have OF a canon. But when i do this i get the following error when i click on the stage to shoot the balls while with the drawn version the balls shoot as planned:</p> <blockquote> <p>TypeError: Error #1009: Cannot access a property or method of a null object reference. at code2/createNewBullet() at code2/mouseClickHandler()</p> </blockquote> <p><strong>This is the code that works:</strong></p> <pre><code>private function init():void { drawBoard = new MovieClip; drawBoard.graphics.beginFill(0xFFFFFF, 0); // white transparant drawBoard.graphics.drawRect(0, 0, gameWidth, gameHeight); drawBoard.graphics.endFill(); addChild(drawBoard); // create canon canon = new MovieClip; canon = new MovieClip; canon.graphics.beginFill(0x000000); canon.graphics.drawRect(0, -10, 50, 20); canon.graphics.endFill(); canon.rotation = -45; canon.x = 25; canon.y = gameHeight; addChild(canon); </code></pre> <p><strong>This is what i am trying to do to use an image instead of a drawn rectangle for the cannon</strong> ((The image loads fine but causes the error))</p> <pre><code>private function init():void { // create drawboard (the important movieclip, that holds all visible elements) drawBoard = new MovieClip; drawBoard.graphics.beginFill(0xFFFFFF, 0); // white transparant drawBoard.graphics.drawRect(0, 0, gameWidth, gameHeight); drawBoard.graphics.endFill(); addChild(drawBoard); var canon:Loader = new Loader(); var fileRequest:URLRequest = new URLRequest("cannon1.png"); canon.load(fileRequest); canon.rotation = -45; canon.x = 25; canon.y = gameHeight; addChild(canon); } </code></pre> <p><strong>And this is the full code if needed:</strong></p> <pre><code>package { // Copyright 2010-2011 - Seinia.com // Find more crazy good AS3.0 tutorials and games on Seinia.com! // imports // -------------------------------------------------------------------------------------- import flash.display.MovieClip; import flash.events.Event; import flash.events.MouseEvent; import flash.geom.Point; import flash.events.*; import flash.net.URLRequest; import flash.display.Loader; import flash.display.Sprite; // Game class (MovieClip extension) // -------------------------------------------------------------------------------------- public class code2 extends MovieClip { // game properties // -------------------------------------------------------------------------------------- var drawBoard:MovieClip; var background:MovieClip; var gameWidth:int = 600; var gameHeight:int = 300; var gravity:Number = .4; var bullets:Array; var canon:MovieClip; // constructor // -------------------------------------------------------------------------------------- public function code2():void { this.focusRect = false; this.init(); addEventListener(Event.ENTER_FRAME, enterFrameHandler, false, 0, true); addEventListener(MouseEvent.CLICK, mouseClickHandler, false, 0, true); bullets = new Array(); } // init the game // -------------------------------------------------------------------------------------- private function init():void { // create drawboard (the important movieclip, that holds all visible elements) drawBoard = new MovieClip; drawBoard.graphics.beginFill(0xFFFFFF, 0); // white transparant drawBoard.graphics.drawRect(0, 0, gameWidth, gameHeight); drawBoard.graphics.endFill(); addChild(drawBoard); var canon:Loader = new Loader(); var fileRequest:URLRequest = new URLRequest("cannon1.png"); canon.load(fileRequest); canon.rotation = -45; canon.x = 25; canon.y = gameHeight; addChild(canon); } // mouse click handler // -------------------------------------------------------------------------------------- private function mouseClickHandler(event:MouseEvent):void { createNewBullet(); } // function to create a new bullet // -------------------------------------------------------------------------------------- private function createNewBullet():void { // init and draw bullet var bullet:MovieClip = new MovieClip; bullet.graphics.beginFill(0xff0000); bullet.graphics.drawCircle(0, 0, 10); bullet.graphics.endFill(); // define bullet start point and speed var cos:Number = Math.cos(canon.rotation * Math.PI / 180); var sin:Number = Math.sin(canon.rotation * Math.PI / 180); var speed:Number = 8; bullet.x = canon.x + cos * canon.width; bullet.y = canon.y + sin * canon.width; bullet.vx = cos * speed; bullet.vy = sin * speed; bullets.push(bullet); addChild(bullet); } // enter frame handler // -------------------------------------------------------------------------------------- private function enterFrameHandler(event:Event):void { for (var i = 0; i &lt; bullets.length; i++ ) { // gravity bullets[i].vy += gravity; // move bullet bullets[i].x += bullets[i].vx; bullets[i].y += bullets[i].vy; // remove star from stage? if (bullets[i].y &gt;= gameHeight) { removeChild(bullets[i]); bullets.splice(i, 1); } } } } </code></pre> <p>}</p>
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