topical media & game development
lib-flex-animation-code-03-com-friendsofed-isometric-MapLoader.ax
lib-flex-animation-code-03-com-friendsofed-isometric-MapLoader.ax
(swf
)
[ flash
]
flex
package com.friendsofed.isometric
{
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.utils.getDefinitionByName;
public class @ax-lib-flex-animation-code-03-com-friendsofed-isometric-MapLoader extends EventDispatcher
{
private var _grid:Array;
private var _loader:URLLoader;
private var _tileTypes:Object;
public function @ax-lib-flex-animation-code-03-com-friendsofed-isometric-MapLoader()
{
_tileTypes = new Object();
}
Loads a text file from the specified url.
parameter: url The location of the text file to load.
public function loadMap(url:String):void
{
_loader = new URLLoader();
_loader.addEventListener(Event.COMPLETE, onLoad);
_loader.load(new URLRequest(url));
}
Parses text file into tile definitions and map.
private function onLoad(event:Event):void
{
_grid = new Array();
var data:String = _loader.data;
// first get each line of the file.
var lines:Array = data.split("\n");
for(var i:int = 0; i < lines.length; i++)
{
var line:String = lines[i];
// if line is a tile type definition.
if(isDefinition(line))
{
parseDefinition(line);
}
// otherwise, if line is not empty and not a comment, it's a list of tile types. add them to grid.
else if(!lineIsEmpty(line) && !isComment(line))
{
var cells:Array = line.split(" ");
_grid.push(cells);
}
}
dispatchEvent(new Event(Event.COMPLETE));
}
private function parseDefinition(line:String):void
{
// break apart the line into tokens
var tokens:Array = line.split(" ");
// get rid of #
tokens.shift();
// first token is the symbol
var symbol:String = tokens.shift() as String;
// loop through the rest of the tokens, which are key/value pairs separated by :
var definition:Object = new Object();
for(var i:int = 0; i < tokens.length; i++)
{
var key:String = tokens[i].split(":")[0];
var val:String = tokens[i].split(":")[1];
definition[key] = val;
}
// register the type and definition
setTileType(symbol, definition);
}
Links a symbol with a definition object.
parameter: symbol The character to use for the definition.
parameter: definition A generic object with definition properties
public function setTileType(symbol:String, definition:Object):void
{
_tileTypes[symbol] = definition;
}
Creates an IsoWorld, iterates through loaded map, adding tiles to it based on map and definitions.
@size The tile size to use when making the world.
returns: A fully populated IsoWorld instance.
public function makeWorld(size:Number):IsoWorld
{
var world:IsoWorld = new IsoWorld();
for(var i:int = 0; i < _grid.length; i++)
{
for(var j:int = 0; j < _grid[i].length; j++)
{
var cellType:String = _grid[i][j];
var cell:Object = _tileTypes[cellType];
var tile:IsoObject;
switch(cell.type)
{
case "DrawnIsoTile" :
tile = new DrawnIsoTile(size, parseInt(cell.color), parseInt(cell.height));
break;
case "DrawnIsoBox" :
tile = new DrawnIsoBox(size, parseInt(cell.color), parseInt(cell.height));
break;
case "GraphicTile" :
var graphicClass:Class = getDefinitionByName(cell.graphicClass) as Class;
tile = new GraphicTile(size, graphicClass, parseInt(cell.xoffset), parseInt(cell.yoffset));
break;
default :
tile = new IsoObject(size);
break;
}
tile.walkable = cell.walkable == "true";
tile.x = j * size;
tile.z = i * size;
world.addChild(tile);
}
}
return world;
}
Returns true if line contains only spaces, false if any other characters.
parameter: line The string to test.
private function lineIsEmpty(line:String):Boolean
{
for(var i:int = 0; i < line.length; i++)
{
if(line.charAt(i) != " ") return false;
}
return true;
}
Returns true if line is a comment (starts with //).
parameter: line The string to test.
private function isComment(line:String):Boolean
{
return line.indexOf("//") == 0;
}
Returns true if line is a definition (starts with #).
parameter: line The string to test.
private function isDefinition(line:String):Boolean
{
return line.indexOf("#") == 0;
}
}
}
(C) Æliens
18/6/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
