Paste each of these expressions into your anchor point property:

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// [CENTER, CENTER]

l = thisLayer.sourceRectAtTime();[l.left + l.width/2, l.top + l.height/2];

// [LEFT, CENTER]

I = thisLayer.sourceRectAtTime();[l.left, l.top + l.height/2];

// [LEFT, BOTTOM]

l = thisLayer.sourceRectAtTime();[l.left, l.top + l.height];

// [RIGHT, BOTTOM]

l = thisLayer.sourceRectAtTime();[l.left + l.width, l.top + l.height];

// [RIGHT, TOP]

l = thisLayer.sourceRectAtTime();[l.left + l.width, l.top];

// [CENTER, TOP]

l = thisLayer.sourceRectAtTime();[l.left + l.width/2, l.top];

// [CENTER, BOTTOM]

l = thisLayer.sourceRectAtTime();[l.left + l.width/2, l.top + l.height];