10PRINT | : negative_squared_cross_mark : 10 PRINT CHR | 3D Printing library

Your code is in the right direction and you managed to draw the first line. It crashed when update-state was called. To fix the code I did the following things:

• Clojure works with pure functions where you cannot "set" values as you seem to wanted to do in update-state (with do only the last expression is returned, not two values). To update-state you need to return a whole new state.
• q/height and q/widths are functions that return the height and width, so call them (surround them by parentheses) to get the number out.
• When you redraw the background in update-state the older lines are gone, so put (q/background 0) in setup.
  • Move (q/no-loop) from update-state to the draw-state entry-point of the program.

And stylistically I changed this:

• Use associative destructuring in function parameter instead of getting values of keys in let.
• Place trailing parentheses on the same line (see Clojure style guide).

Below the working version: