'''gc''' is the Nspire's ''graphic context''. A graphics context is a module that has a handle to the script’s graphics output window and a library of graphics routines that are used to draw on the window. A graphics context is supplied to the script ”on.paint” event handler each time the window needs to be redrawn. The graphics context employs a pixel-based coordinate system with the origin in the upper left corner of the drawing window.
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*'''[[gc:clipRect]]'''(op, x, y, width, height) - Sets the clipping rectangle for subsequent graphics operations.
*'''[[gc:clipRect]]'''(op, x, y, width, height) - Sets the clipping rectangle for subsequent graphics operations.
*'''[[gc:drawArc]]'''(x, y, width, height, start angle, finish angle).
*'''[[gc:drawArc]]'''(x, y, width, height, start angle, finish angle).