How to Create a Platform Game in AS2 – Part 2
Part 2: Creating the Level
Now, we have to set up blocks on stage that will account for a level. We’ll use an array to accomplish this manly feat. We’re also going to create some other level variables. Place this code at the top:
//LEVEL VARIABLES //the current lvl var lvlCurrent:Number = 1; /*The key for the level arrays: 1: Regular Block X: Main Character */ //this variable will hold the character var X:String = 'MAIN'; //the array for level 1 var lvlArray1:Array = new Array( 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,X,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1, 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 );
This is a pretty big array, but it won’t be too hard to understand, I hope. The next thing we have to do is to actually make a function which creates the level. We’ll make some more variables for this as well:
//current row that we are creating var row:Number = 0;
Next, we have to create a MovieClip that will act as the block. I’m just going to make it a 25×25 white square without borders. Name it mcBlock, then export it for ActionScript:
Finally, we can do some more coding. Now, we have to define the function that will place the bricks on stage. Place the following code at the end of the frame:
//creating the level //this empty movieclip will hold all of the blocks _root.createEmptyMovieClip('blockHolder',_root.getNextHighestDepth()); function createLvl():Void{ //finding the array of the current level we're on //this is just a way to dynamically select an Array within the document var lvlArray:Array = _root['lvlArray'+lvlCurrent]; //we have to find how far this level will span //this will be used so we know when to move to the next row //there will always be 16 rows, so this is how we find it out //of course, this will make the level formatting very strict var lvlColumns:Number = Math.ceil(lvlArray.length/16); //now we can create the level for(var i:Number=0;i<lvlArray.length;i++){ if(i/lvlColumns == int(i/lvlColumns)){ row ++; //moving onto the next row once we're done with a column } if(lvlArray[i] == 1){ //making a new block and adding it to stage blockHolder.attachMovie('mcBlock', 'Block'+i,blockHolder.getNextHighestDepth()); //modifying this guy's coordinates blockHolder['Block'+i]._x = (i-(row-1)*lvlColumns)*25; blockHolder['Block'+i]._y = (row-1)*25; } else if (lvlArray[i] == 'MAIN'){ //changing main's coordinates if we spot him mcMain._x = (i-(row-1)*lvlColumns)*25; mcMain._y = (row-1)*25; } } //reset the row for later use row = 0; } //finally, we run the function for the first time createLvl();
This is some pretty intense code. Look it over for a bit and try to comprehend it. This type of code is what you need to make if you want to become a better developer.
This concludes this part of the tutorial. Next time, we’ll add some code to these blocks and make them interact with the character. Stay tuned…
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