Make a script to position anchor point

Hi 🙂 

I want to make a script to move the anchor point of a selected solid to the top left. how can I do that?

I have this function to center it but dont know how to convert it to the top left

function centerAnchorPoint( layer ){  
      
    var comp = layer.containingComp;  
    var curTime = comp.time;  
    var layerAnchor = layer.anchorPoint.value;  
      
    /* find center by bounding box of the layer */  
    var x = layer.sourceRectAtTime(curTime, false).width/2;  
    var y = layer.sourceRectAtTime(curTime, false).height/2;  
    
    var xAdd = (x-layerAnchor[0]) * (layer.scale.value[0]/100);  
    var yAdd = (y-layerAnchor[1]) * (layer.scale.value[1]/100);  
      
    /* set new anchor point*/  
    layer.anchorPoint.setValue([ x, y ]);  
      
    var layerPosition = layer.position.value;  
      
    /* fix position with adjustments */  
    layer.position.setValue([ layerPosition[0] + xAdd, layerPosition[1] + yAdd, layerPosition[2] ]);  
      
      
      
      
};