3B box trigonometry question ... experts?

Hey

I just checked out an excellent 3D tut here
http://www.codylindley.com/Tutorials/trigonometry/

I'm trying to point out the 8 x and y postitions in a box ...
Perspective depth is not important in my case.
I do need to incorporate a viewing angle (see attached trig.gif)

any help out there?

Kind Regards
Poden

******** AS *********

Code:

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// you'll need to make a linked clip named 'dot'
function attBox(){
 var distance = 200;  // perspective
 var width = 150;  // box width
 var height= 200;  // box height
 var depth = 50;  // box depth
 // it takes 8 (x,y,x points) to make a box
 arrX = [width,width,width,width,0,0,0,0]  // xpos
 arrY = [height,height,0,0,height,height,0,0] // ypos
 arrZ = [depth,0,depth,0,depth,0,depth,0]  // zpos
 for(var i=0;i<arrX.length;i++){    // loop
  _root.attachMovie("dot",["dot"+i],i) // attaching mc 'dot'
  _mc = _root["dot"+i]    // variable mc name
  var x = arrX[i];
  var y = arrY[i];
  var z = arrZ[i];
  var perspective_ratio = distance/(distance+z)
  var perspective_x = x * perspective_ratio;
  var perspective_y = y * perspective_ratio;
  _mc._x = perspective_x;
  _mc._y = perspective_y;
 }
}
attBox()

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******** AS *********
http://test.nozebra.dk/trig/trig.gif

anyone??? please??? :P