Scheme assignment 3: Make a spiral out of small squares with turtle graphics (see picture at the bottom of the page)
Fall 2005

1. Choose the correct Language (see the Language menu): Pretty Big in the PLT suib menu

2. Choose the turtle Teachpack (see the Language menu): Add teachpack, add turtles.ss

3. Load this program:
   • squarespiral.scm, iterative and recursive versions

        Load this into the upper window of DrScheme.
        Click on the "Run" ("Execute" in Windows) button, upper right.
        In the lower window (or add these as commands in your program)
        (squarespiral 100)
        (clear)
        (squarespiralRec 100 2)
       
     
       
     
     
     

4. constantDistance.scm

    Run with the function "constantAngleSpiral" with parameters 121 and 4:
    
   (turtles)
   (begin
     (turn -90)
     (move 100)
     (turn 90)
     (constantAngleSpiral 121 4))   ;; put these lines in your program
     
   
     
   
    

5. Scheme assignment 2: Spiral made of squares

    First try running the function "constantDistance" from the file above
     using the parameters 100 40 5 23:
    
    (turtles)
   (begin
     (turn -90)
     (move 100)
     (turn 90)
     (constantDistance 100 40 5 23))
     
   
     
   
   

   Build this spiral out of squares to get this picture:

    (turn -90) (move 100) (turn 90)
    (spiralsquares 100 40 5 23)