code: function (v) {
              var a = this.val,
                  x = v.x,
                  y = v.y;
  
              v.x = x * a[0] + y * a[3] + a[6];
              v.y = x * a[1] + y * a[4] + a[7];
  
              return v;
          }
docs: Transforms the given vector according to this matrix.
  @name multiplyVector
  @memberOf me.Matrix2d
  @function
  @param {me.Vector2d} vector the vector object to be transformed
  @return {me.Vector2d} result vector object. Useful for chaining method calls.