Find distance between two points

Find distance between two points using Point class and using Pythagorean Theorem.

by mucaccino 10 Aug 2011

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/**
 * Copyright mucaccino ( http://wonderfl.net/user/mucaccino )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/ba02
 */

package {
    import flash.geom.Point;
    import flash.display.Sprite;
    import flash.utils.getTimer;
    public class FlashTest extends Sprite {
        public function FlashTest() {
            inittrace(stage);
            // aux vars
            var init:Number, end:Number, aux:Number;
            // points
            var pt1:Point = new Point(0, 0);
            var pt2:Point = new Point(10, 10);
            // find distance usign Point.distance
            var dt1:Number;
            init = getTimer();
            aux=10000000;
            while(aux>0) {
                dt1 = Point.distance(pt1, pt2);
                aux--;
            }
            end = getTimer();            
            trace('// finded distance using point:\n');
            trace('[distance=' + dt1 + ", execution time: " + (end-init) + "ms]");
            // find distance usign the pythagorean theorem 
            var dt2:Number;
            init = getTimer();
            aux=10000000;
            while(aux>0) {
                dt2 = Util.distance(pt1.x, pt1.y ,pt2.x, pt2.y);
                aux--;
            }
            end = getTimer(); 
            trace('// finded distance using pythagorean theorem:\n');
            trace('[distance=' + dt2 + ", execution time: " + (end-init) + "ms]");
        }        
 
    }
}

/////  CLASS UTIL TO ENCAPSULATE FIND METHOD /////

import flash.geom.Point;

class Util {
    public static function distance (x1:int, y1:int, x2:int, y2:int):Number {
       var dx:int = x2 - x1;
       var dy:int = y2 - y1;
       return Math.sqrt(dx*dx + dy*dy)
    }
}


/////  WONDERFL TRACE /////

import flash.display.Sprite;
import flash.display.Stage;
import flash.text.TextField;
import flash.text.TextFormat;


function inittrace(s:Stage):void
{
    WTrace.initTrace(s);
}

//global trace function
var trace:Function;

//wtreace class
class WTrace
{
        private static var FONT:String = "Fixedsys";
        private static var SIZE:Number = 12;
        private static var TextFields:Array = [];
        private static var trace_stage:Stage;
        
        public static function initTrace(stg:Stage):void
        {
            trace_stage = stg;
            trace = wtrace;
        }
        
        private static function scrollup():void
        {
            // maximum number of lines: 100
            if (TextFields.length > 100) 
            {
                var removeme:TextField = TextFields.shift();
                trace_stage.removeChild(removeme);
                removeme = null;
            }
            for(var x:Number=0;x<TextFields.length;x++)
            {
                (TextFields[x] as TextField).y -= SIZE*1.2;
            }
        }
    
        public static function wtrace(... args):void
        {
        
            var s:String="";
            var tracefield:TextField;
            
            for (var i:int;i < args.length;i++)
            {
                // imitating flash:
                // putting a space between the parameters
                if (i != 0) s+=" ";
                s+=args[i].toString();
            }
            

            tracefield= new TextField();
            tracefield.autoSize = "left";
            tracefield.text = s;
            tracefield.y = trace_stage.stageHeight - 20;

            var tf:TextFormat = new TextFormat(FONT, SIZE);
            tracefield.setTextFormat(tf);
            trace_stage.addChild(tracefield);
            scrollup();                      
            TextFields.push(tracefield);
            
        }
}