Active Visual Scaffolding by Charles Kelemen and Eugene Turk

Example (continued)

The student using Samba must write commands to samba.in that when interpreted by Samba will yield the animation. So a portion of a students program might look like: 
....

 else
    {
       if (current != root)
         {
           parentx = getx(current->parent);
         }
       else
         {
            parentx = 1;
         }
          
       float newx = getx(current) + .5*(ABS(parentx - getx(current)));
       float newy = gety(current) - .08;
          
       output << "{" << endl;
       output << "move " << jake->id << " " << newx << " " << newy << endl;
       output << "move " << "TX" << jake->id << " "  << newx  << " ";
       output << newy << " " << endl;  
       output << "}" << endl;
     }


....

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