8. Build It Test

The model is a time we will call $t$. The time will be between $0$ and $6\pi$.

The people coordinates are given by:

  (define (x-blue t) (* 200 (cos t))
  (define (y-red  t) (* 150 (sin t))

Yellow Box

Make a 400x50 yellow rectangle for the background. Place a single horizontal gray line in the middle (for the axis).

The horizontal axis of the graph will be “t”. On the vertical axis, graph the y-red function with a red dot.

  • Computer coordinates are $0 \le x \le 400$ and $0 \le y \le 50$.
  • People coordinates are horizontally $0\le t \le 6\pi$ and vertically $-200 \le y \le 200$.

After have the first part working, on the same image, graph the x-blue function vertically with a blue dot. (So really the x-blue will be a vertical amount.)

The right side bar is a 50x400 white rectangle. The red dot moves with x-coordinate 25 and y-coordinate given by y-red, using the same model t as the rest of the animation.

The bottom side bar is a 400x50 white rectangle. The blue dot moves with x-coordinate x-red and y-coordinate 25.

Center Box

The center box is a 400x400 outlined rectangle. The purple dot moves with x-coordinate from x-blue and y-coordinate from y-red.

Demo