Stats

  • Locked Locked
  • Replies 4
  • Subscribers 143
  • Views 1181
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

difficulty in understanding the code from sklanguser page 372 - 382

Adhil
Hi Please refer the code taken from sklanguser( cadence skill language user guide ) page 377 - 382. i understand how to use classes, but i dont understand this code. defmethod( Update (( obj IntersectionTwoLines_Point )) printf( "Figure out my x & y from Lines %L %L\n" obj->L1 obj->L2 ) let(( A1 B1 C1 A2 B2 C2 det ) A1 = obj->L1->A B1 = obj->L1->B C1 = obj->L1->C A2 = obj->L2->A B2 = obj->L2->B C2 = obj->L2->C det = A1*B2-A2*B2 when( det == 0 error( "Can not intersect two parallel lines\n") ) obj->x = ((-C1)*B2-(-C2)*B1)*1.0/det obj->y = (A1*(-C1)-A2*(-C1))*1.0/det ) callNextMethod( obj ) ) where the A B & C are clearly variables of the class Line. they cannot be accessed by IntersectionTwoLines_Point which is a subclass of "Point" a sibling class of "Line" (refer the pages i sent you you will understand). how is A1 = obj->L1->A B1 = obj->L1->B C1 = obj->L1->C A2 = obj->L2->A B2 = obj->L2->B C2 = obj->L2->C possible? Adhil
Parents
  • Andrew Beckett

    Adhil,

    A little hard to read due to the formatting (perhaps you were using Chrome - this forum doesn't seem to work very well with Chrome).

    Anyway, the answer is in the function make_IntersectionTwoLines_Point(). This is an argument that takes two line objects, and creates an instance of the IntersectionTwoLines_Point class, with L1 and L2 set to the two line objects. Each line object is of class Line or one of its subclasses, and so have slots A, B and C. Thus the newly created object from this function has obj->L1->A etc.

    Hope that clarifies things.

    Andrew.

     

Reply
  • Andrew Beckett

    Adhil,

    A little hard to read due to the formatting (perhaps you were using Chrome - this forum doesn't seem to work very well with Chrome).

    Anyway, the answer is in the function make_IntersectionTwoLines_Point(). This is an argument that takes two line objects, and creates an instance of the IntersectionTwoLines_Point class, with L1 and L2 set to the two line objects. Each line object is of class Line or one of its subclasses, and so have slots A, B and C. Thus the newly created object from this function has obj->L1->A etc.

    Hope that clarifies things.

    Andrew.

     

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.