Graphing Coordinate Planes To Make Pictures ((NEW))
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Exercise 9 Design a function image-coords which takesa plane and a list of extents and returns a list of posns. Thenew function image-coords should produce the corresponding list ofposns in the coordinate system of a DrRacket image. Also likeextents, the new function image-coords should interpret thepositive y-direction in its input to point upward. But unlikeextents, the new function image-coords should interpret the extentsof the input list of extents to be the extents of the image, notits origin.
Exercise 7 Design a function scale which takes a number andreturns the corresponding integer. Use scale to produce the scalefrom your image. For example, if xscale is 100, then do(map (lambda (posn) (+ posn xscale)) (make-posn 0 0))should yield to the output(100 0).
Exercise 8 Design a function image-extents which takes aplane and produces a list of extents. The extents list isthe list of extents (xmin ymin xmax ymax) computed from the xscaleand yscale used to describe the original picture. The extentslist should be interpreted as if the original picture was an igraphical image of height xscale and width yscale and limited tothe specified extents. For example, if xscale and yscale are100 and 5, respectively, then (image-extents plane) shouldyield to the output (list (list -20 30 10 50)).
Exercise 10 Design a function image-extents which takes aplane and produces a list of extents. The extents list isthe list of extents (xmin ymin xmax ymax) computed from the xscaleand yscale used to describe the original picture. The extentslist should be interpreted as if the original picture was an igraphical image of height xscale and width yscale and limited tothe specified extents. For example, if xscale and yscale are100 and 5, respectively, then (image-extents plane) shouldyield to the output (list (list -20 30 10 50)).
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One of the drawbacks to this approach was that we needed to recompile every time we made even a small change to the code. This slowed everything else we were doing down and because we couldn't always have someone waiting for the application to finish building. 827ec27edc