Posts Tagged ‘loader’

AS3 Bitmap Resource Manager

Saturday, December 1st, 2007

I’m now using a new class for this task which can be found here. That said, feel free to read on about this outdated class.

I’ve completely rewritten my multiple bitmap loader into a new machine. It now uses weak referenced dictionary objects to store bitmapData after it has been extracted or loaded from the web. It is meant to hold all instances of bitmapData for a class, a set of classes or a whole game even. The class, bitmapDataRsrc, takes either a bitmap, bitmapData or string path to an image or an array consisting of either bitmaps, bitmapData, string paths, or some combination thereof, along with a string identifier and loads the bitmapData into a dictionary object with it’s identifier as a key. It then pushes it’s load status [true or false] into another dictionary with the object itself as the key, so every bitmapData resource and it’s load status is accessible through the identifier. Once every resource is loaded bitmapDataRsrc dispatches an Event.COMPLETE event. For instance, let’s say I wanted to load and store all the bitmapData needed to build a GUI window:

import com.efnx.utils.bitmapDataRsrc;

var rsrc:bitmapDataRsrc = new bitmapDataRsrc();

rsrc.addEventListener(Event.COMPLETE, attachGraphicElements, false, 0, true);

//load resources///////////////////////
    rsrc.load("rsrc2/bottomBar.png", "bottomBar");
    rsrc.load("rsrc2/contentBG.png", "contentBG");
    rsrc.load("rsrc2/contentOverlay.png", "contentOverlay");
    rsrc.load("rsrc2/leftArrowDown.png", "leftArrowDown");
    rsrc.load("rsrc2/leftArrowOver.png", "leftArrowOver");
    rsrc.load("rsrc2/leftArrowUp.png", "leftArrowUp");
    rsrc.load("rsrc2/upArrowDown.png", "upArrowDown");
    rsrc.load("rsrc2/upArrowOver.png", "upArrowOver");
    rsrc.load("rsrc2/upArrowUp.png", "upArrowUp");
    rsrc.load("rsrc2/rightArrowDown.png", "rightArrowDown");
    rsrc.load("rsrc2/rightArrowOver.png", "rightArrowOver");
    rsrc.load("rsrc2/rightArrowUp.png", "rightArrowUp");
    rsrc.load("rsrc2/downArrowDown.png", "downArrowDown");
    rsrc.load("rsrc2/downArrowOver.png", "downArrowOver");
    rsrc.load("rsrc2/downArrowUp.png", "downArrowUp");
    rsrc.load("rsrc2/leftBar.png", "leftBar");
    rsrc.load("rsrc2/leftBottomCorner.png", "bottomLeftCorner");
    rsrc.load("rsrc2/MbuttonDown.png", "MbuttonDown");
    rsrc.load("rsrc2/MbuttonOver.png", "MbuttonOver");
    rsrc.load("rsrc2/MbuttonUp.png", "MbuttonUp");
    rsrc.load("rsrc2/ObuttonDown.png", "ObuttonDown");
    rsrc.load("rsrc2/ObuttonOver.png", "ObuttonOver");
    rsrc.load("rsrc2/ObuttonUp.png", "ObuttonUp");
    rsrc.load("rsrc2/resizeDown.png", "resizeDown");
    rsrc.load("rsrc2/resizeOver.png", "resizeOver");
    rsrc.load("rsrc2/resizeUp.png", "resizeUp");
    rsrc.load("rsrc2/rightBar.png", "rightBar");
    rsrc.load("rsrc2/rightBottomCorner.png", "bottomRightCorner");
    rsrc.load("rsrc2/hBarLeft.png", "hBarLeft");
    rsrc.load("rsrc2/hBarMiddle.png", "hBarMiddle");
    rsrc.load("rsrc2/hBarRight.png", "hBarRight");
    rsrc.load("rsrc2/vBarBottom.png", "vBarBottom");
    rsrc.load("rsrc2/vBarMiddle.png", "vBarMiddle");
    rsrc.load("rsrc2/vBarTop.png", "vBarTop");
    rsrc.load("rsrc2/windowBarLeft.png", "upperLeftCorner");
    rsrc.load("rsrc2/windowBarMiddle.png", "topBar");
    rsrc.load("rsrc2/windowBarRight.png", "upperRightCorner");
    rsrc.load("rsrc2/XbuttonDown.png", "XbuttonDown");
    rsrc.load("rsrc2/XbuttonUp.png", "XbuttonUp");
    rsrc.load("rsrc2/XbuttonOver.png", "XbuttonOver");

After the resources are done loading you can access the bitmapData using the get() function with the string identifier [2nd parameter] passed with the load() function. Below I’ll demonstrate accessing the last bitmapData, XbuttonOver.png.

function attachGraphicElements(event:Event):void
     var bitmap:Bitmap = new Bitmap();
     bitmap.bitmapData = rsrc.get("XbuttonOver");

If you get lazy and decide not to give bitmapDataRsrc string identifiers to identify your resource, it will make one up for you. If you decide to pass an array of bitmaps, bitmapData and string paths to images as the first parameter to the load() function, and pass a string identifier as the second parameter your resources will be indexed as “string identifier + number” so that all your resources are accessible. When passing an array of resources you can identify each one yourself by first indexing the resource and string identifier in another array and then pushing that array into the parameter array. In this case a second parameter to the load function is not needed. Check it out:

import com.efnx.utils.bitmapDataRsrc;

var rsrc:bitmapDataRsrc = new bitmapDataRsrc();
var array:Array;
var string:String;

for(var i:int = 0; i<100; i++)
    string = "image"+i;
    array = new Array();
    array.push("rsrcPath"+string+".png", string);


I find it a lot easier to load resources one by one and name them, it’s a lot better for me, I like to get to know my bitmapData, but it’s good to have options.

The isLoaded property can be checked to find out if all resources have loaded. At any point the load status of a single resource can be found by calling the hasLoaded(“string identifier”):Boolean function. If no identifier is given bitmapDataRsrc returns it’s isLoaded property. To destroy a given resource call unload(“string identifier”) and to destroy all resources in the manager call unloadAll():


bitmapDataRsrc Source

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