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1. MrABC 11.17.08 / 11am

   Hello! i have a question.
   ex:
   i have 4 point (a rectangle)
   and i want to rotate them in 90°

   code:
   angle = Math.PI/2;

   var a = $M([
   [2,2,0],
   [2,5,0],
   [7,5,0],
   [7,5,0]
   ]);

   var b = $V([7,2,0]);

   R = Matrix.Rotation(angle);
   test = R.add(a.elements);
2. MrABC 11.17.08 / 11am

   sry i wrote wrong, sory
   ex:
   i have 4 point (a rectangle)
   and i want to rotate them in 90°

   code:
   angle = Math.PI/2;

   var a = $M([
   [2,2,0],
   [2,5,0],
   [7,5,0],
   [7,2,0]
   ]);

   R = Matrix.Rotation(angle);
   result = R.add(a);

   Dis i do wrong? i try to read the Tutorial
   http://sylvester.jcoglan.com/api/matrix

   but i cant get it! sry
   can you help me?
3. James Coglan 11.19.08 / 11am

   You’re trying to add two matrices of different sizes, which doesn’t make mathematical sense. The way to model your problem is with vectors: vectors represent single points in space.

   var rect = [$V([2,2]), $V([2,5]),
               $V([7,5]), $V([7,2])];

   Then you multiply each point with the rotation matrix to transform them:

   var rot = Matrix.Rotation(Math.PI/2),
       i = rect.length;
   
   while (i--) rect[i] = rot.x(rect[i]);

   Or, use the Vector#rotate method.
4. Jan Theodore Galkowski 3.5.09 / 7pm

   Anyone port Sylvester to Actionscript? Even though they have a Matrix class, there’s little support. There is a Clevrlib1 which has some more, including SVD and QR decomposition, but it doesn’t support Vector, Plane, Line, except as special cases of Matrix.

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