CSci 1301: Lab 6

You may work in groups of 2 or 3 (preferred) or individually.

What to submit

At the end of the lab please send me and your group partner(s) all your Scheme files as e-mail attachments. My e-mail is elenam at The subject of your e-mail must be "1301 Lab 6" followed by "Final" or "Not final", depending on whether this is a final submission or you are still working on it. If you need to finish it, make sure to set up a time with your group partner(s) to finish the lab.

When to submit

Due Friday, October 23rd, at 11:59pm. If you submit the final version during the lab, you are done.

Problem 1 (10 points)

Write a function draw-stairs that draws a "staircase" of a given color. More precisely, the function has the following header:

(define (draw-stairs left-upper n width height color)

where left-upper is the position of the left-upper corner of the staircase, n is the number of steps that remain to be drawn, width is the width of one stair, height is the height of a step, and color is the color of the staircase.
Below is an example:

(draw-stairs (make-posn 10 10) 8 40 40 'green)

Problem 2: Checker board (12 points)

Write a function checker-board that takes draws an 8-by-8 checker board of two colors. More precisely, the function is defined as

(define (checker-board left-upper n side color1 color2))

Here left-upper is the position of the left-upper corner of the board, n is the number of rows that remain to be drawn, side is the side of a square, color1 is the starting color for the row, and color2 is the alternating color.

The function requires a "helper" function draw-row that draws one row of the board. Write and test the helper function first. Think of what parameters it needs (what is its base case?).

CSci 1301 course web site.

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