Could U do it Better?

programming flash
1

I needed a Function to draw an arrow facing either up, down,left, or right and returned as either a Shape, Sprite, or MovieClip. This is what i came up with. My question is: could it be made more concise?

var myTriangleSprite:Sprite =drawTriangle(10,“left”,0xffffff,“Sprite”);

function drawTriangle(triangleHeight:Number=10,dir:String=“up”,color:uint=0xffffff,type:String=“MovieClip”){

var upArray:Array = [(triangleHeight/2),0,triangleHeight,triangleHeight,0,triangleHeight];
var rightArray:Array = [0,0,triangleHeight,(triangleHeight/2),0,triangleHeight];
var downArray:Array = [0,0,triangleHeight,0,(triangleHeight/2),triangleHeight];
var leftArray:Array = [triangleHeight,0,triangleHeight,triangleHeight,0,(triangleHeight/2)];

var a:Array;
var graphics:Graphics ;

if (type == "MovieClip"){
    var triMC:MovieClip= new MovieClip();
    triMC.name ="triangleMC";
    graphics=triMC.graphics;
    addChild(triMC);        
}
if (type == "Sprite"){
     var triSP:Sprite = new Sprite();
     triSP.name="triangleSprite";
     graphics=triSP.graphics;
     addChild(triSP);
}
if (type == "Shape"){
     var triSH:Shape = new Shape();
     triSH.name="triangleShape";
     graphics=triSH.graphics;
     addChild(triSH);
}

switch (dir){
    case "up":
    a=upArray;
    break;        
    case "right":
    a=rightArray;
    break;        
    case "down":
    a=downArray;
    break;        
    case "left":
    a=leftArray;
    break;        
}    

graphics.beginFill(color);
graphics.moveTo(a[0],a[1]);
graphics.lineTo(a[2],a[3]);
graphics.lineTo(a[4],a[5]);
graphics.lineTo(a[0],a[1]);

if (type == "MovieClip"){
    return triMC;
}
if (type == "Sprite"){
    return triSP;
}
if (type == "Shape"){
    return triSH;
}

}