3. Controls
The basics of the control grid in the upper right.
3. Active controls?
We will write a function to determine if a point is in the control grid.
3a. Center coordinates
What are the coordinates of the center of the Q4 control grid?
3b. Check expects
Write two check-expects, one showing a point that is not the center is inside the grid, and another showing a point that is outside the grid.
3c. In control grid?
Write the function in-control-grid? : posn -> boolean