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Understanding Image Manipulation Precondition for Selecting Ellipses

Learn about the preconditions for using image-select-ellipse! function for image manipulation and examples of image selection operations.

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Understanding Image Manipulation Precondition for Selecting Ellipses

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  1. What precondition would you NOT expect image-select-ellipse! to have? • width > 0 • left > 0 • (left + width) > 0 • operation is REPLACE, ADD, SUBTRACT, or INTERSECT • I’d expect it to have all of these preconditions.

  2. What image does this describe?(define img (image-show (image-new 200 200))(image-select-rectangle! img REPLACE 50 50 100 100)(image-select-rectangle! img SUBTRACT 120 50 40 100)(image-fill-selection! img) • A square of edge length 100 • A square of edge length 50 • A square of edge length 100 with a small chunk taken out • Two rectangles • A rectangle of width 80 and height 100

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