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These functions control the display of graphical images such as lines and
circles.  Lines and figures are drawn using the current color (see the
 _setcolor function), the current line style (see the  _setlinestyle
function), the current fill mask (see the  _setfillmask function), and the
current plotting action (see the  _setplotaction function).

The following functions are defined:

_getarcinfo
    get the endpoints of the most recently drawn arc

_getbkcolor
    get the background color

_getcolor
    get the current color

_getfillmask
    get the current fill mask

_getlinestyle
    get the current line style

_getplotaction
    get the current plotting action

_remapallpalette
    assign colors for all pixel values

_remappalette
    assign color for one pixel value

_selectpalette
    select a palette

_setbkcolor
    set the background color

_setcolor
    set the current color

_setfillmask
    set the current fill mask

_setlinestyle
    set the current line style

_setplotaction
    set the current plotting action