Follow cam prototype

Prototype of a camera following a player

by mutantleg 11 Sep 2012

Tags

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

package {
    import flash.events.Event;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        
        public var myCam:Cam;
        public var act:Actor;
        
        public function FlashTest() {
            // write as3 code here..
        
            myCam = new Cam();
            addChild(myCam);
            myCam.x = 200;
            myCam.y = 200;
            
            act = new Actor();
            addChild(act);
            
            stage.addEventListener(Event.ENTER_FRAME, onEnter);
        }//ctor
        
        public function onEnter(e:Event):void
        {
            myCam.lookAt(mouseX, mouseY);
            myCam.follow(mouseX, mouseY);
            act.x = mouseX;
            act.y = mouseY;
            
            act.rotation = myCam.rotation;
            
        }//onenter
        
    }//classend
}
import flash.text.TextField;
import flash.display.Sprite;

internal class Actor extends Sprite
{
    public function Actor()
    {
        graphics.clear();
        graphics.lineStyle(2,0x0000FF);
        graphics.drawCircle(0,0, 16);
        graphics.moveTo(0,0);
        graphics.lineTo(16,0);
        
    }//ctor
    
    
}//classend

internal class Cam extends Sprite
{
    public var deb:TextField;
    
    public function Cam()
    {
        graphics.clear();
        graphics.lineStyle(2,0);
        graphics.drawCircle(0,0, 16);
        graphics.moveTo(0,0);
        graphics.lineTo(16,0);
        
        deb = new TextField();
       // addChild(deb);
        
    }//ctor
    
    public function lookAt(kx:Number, ky:Number):void
    {
        var a:Number;
        var dx:Number;
        var dy:Number;
        dx = kx - x;
        dy = ky - y;
        a = Math.atan2(dy,dx) * 180/3.1415;
        
        this.rotation= a;
        
        //if (isNaN(a)) { deb.text ="NaN"; return;}
        deb.text= "Ang: "+a;
    }//lookat
    
    public function follow(kx:Number, ky:Number, rest:Number = 100):void
    {
        var dx:Number;
        var dy:Number;
        var nx:Number;
        var ny:Number;
        var mag:Number;
        
        dx = kx - x;
        dy = ky - y;
        mag = Math.sqrt(dx*dx + dy*dy);
        if (mag == 0) { mag = 0.000000001;}
        nx = dx / mag;
        ny = dy / mag;
        
        x += nx * 0.1 * (mag - rest);
        y += ny * 0.1 * (mag - rest);
        
        
    }//follow
    
}//classend