27 lines
752 B
Scheme
27 lines
752 B
Scheme
(define plotter
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(lambda (f res x1 x2 y1 y2)
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(let* ((dx (- x2 x1)) (dy (- y2 y1)) (delta (/ dx res)))
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(letrec
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((scaled
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(lambda (f x y)
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(f
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(* res (/ (- x x1) dx))
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(* res (/ (- y y1) dy)))))
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(plotit
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(lambda (x)
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(scaled draw-line x (f x))
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(if (< x x2) (plotit (+ x delta))))))
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(draw-color 0 0 0)
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(scaled draw-move 0 y1)
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(scaled draw-line 0 y2)
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(scaled draw-move x1 0)
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(scaled draw-line x2 0)
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(draw-color 255 0 0)
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(scaled draw-move x1 (f x1))
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(plotit x1)))))
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(plotter (lambda (x) (* x x x)) 70 -5.0 5.0 -50.0 50.0)
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(plotter sin 50 -5.0 5.0 -1.0 1.0)
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(plotter (lambda (x) (* x (sin x))) 100 -25.0 25.0 -25.0 25.0)
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(plotter (lambda (x) (+ (* x x) (* -5 x) 6)) 80 -1.0 5.0 -3.0 10.0)
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