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Dr. Scheme anyone? - applying axes in a scene

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I regularly use Dr. Scheme (a free computer program) and frequently encounter a few problems some of which with the use of Dr. Scheme's help desk can't be solved. I recently encountered the problem of fixing the background of my scene

I want my background to have bisecting lines (axes in a scene)

there's a built in function scene+line that solves this

it's

(scene+line s x0 y0 x1 y1 c) → Scene

s : Scene

x0 : number?

y0 : number?

x1 : number?

y1 : number?

c : Color

 

I honestly don't know what the x0 y0 x1 and y1 must be

I'm a big fan of DrScheme but I mostly use it as a plain old vanilla Scheme REPL... sorry

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