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Additional info for Computer Graphics Programming: GKS — The Graphics Standard
By adjusting a potentiometer or by entering a number into the keyboard). CHOICE: provides a non-negative integer which represents a selection from a number of choices. , by pressing one of a number of buttons or by pointing at one of the items of a menu). PICK: provides a segment name and a pick identifier. , he may use a lightpen or the crosshair positioned by a joystick to point to a primitive at the screen). Pick identifiers are explained in Chapter 11. STRING: provides a character string.
6 Copying Segments Three functions can use the data in segments in the WISS. None of these functions modify the contents of segments to which they are applied. COpy SEGMENT TO WORKSTATION makes a copy of each primitive and its associated clipping rectangle in a segment in the WISS, transforms the primitives by the segment transformation and puts the c1ipping rectangles and the transformed primitives into the viewing pipeline at the place equivalent to the one where the segment was taken off, but on the pathway to the workstation specified in the function call.
They are eligible for copying by copy-functions as long as the WISS is not c10sed (in which case, all stored segments will be deleted). Besides opening and c1osing, activating and deactivating the WISS workstation, the c1ear function can be used for the WISS. It will delete all stored segments. Primitives are transformed from world coordinates to NDC before they are recorded in the WISS. The clipping rectangle (viewport of the normalization transformation) is stored together with the primitives contained in asegment.