Cropping

Lines and rays extend far beyond the limits of the screen. Depending on the specifics of a sketch, other objects, particularly loci and function plots, may have similar extents. But when you copy such objects, you don’t want an image of infinite size. Accordingly, if an image being copied extends beyond the edges of the window, Sketchpad crops the image to the window dimensions.

You can use this behavior to control the exact extent of the image copied to the clipboard. Before copying, resize and scroll your sketch window so that it shows the desired portion of the sketch. When you choose Copy, the clipboard image will be correctly cropped.