Subversion Repositories wimsdev

!set methtit=Add a number to the two sides of an equation
!set methparmtype=number,parm equation
!set methhelp=This method transforms an equation \(a = b)\
 into the equivalent equation \(a + n = b + n), where \(n) is a number.

!if $wims_read_parm iswordof form check
  !goto $wims_read_parm
!endif

!exit
:form
 Add the number
 !read deduc/methparm.phtml 1,15
 to the two sides of the equation
 !read deduc/methparm.phtml 2

!exit
:check
!distribute items $methparmobj2 into data,left,sign,right
methexp=Add \($methparm1) to two sides of \($left $sign $right)

!read deduc/sub/simplify ($left + ($methparm1)\
        $right + ($methparm1)
!distribute lines $out into newleft,newright
!if $newleft=$empty or $newright=$empty
  error=bad_data
  !exit
!endif
newsign=$sign
newobject2=$newleft $newsign $newright
oldobject=2

contextlist=$ct_Always,\
        $ct_Onlywhen the added number is of constant sign,\
        $ct_Onlywhen the added number is positive

!if $askresult>1
  !read deduc/sub/simplify $left - ($methparm1)\
        $right - ($methparm1)
  !distribute lines $out into badleft, badright
  badsign=!translate internal <> to >< in $newsign

  resultlist=$newobject2,\
          $newleft $newsign $badright,\
          $badleft $newsign $newright
!endif

!exit