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These operations allow you to: change the font used for drawing text in a graphics-device window; take a snapshot of a graphics-device window and return it as an image object; and draw multiple lines efficiently.
operation+: os2-graphics-device set-font font-name
This operation sets the font used for drawing text in the
graphics-device window. Font-name is a string describing the
font; this string is in the form "<point-size>.<family-name>", for
example, "10.Courier". You may specify any fixed-pitch font
family, in any point size that is supported for that font family. This
includes both image fonts and outline fonts.
operation+: os2-graphics-device capture-image x-left y-bottom x-right y-top
This operation creates and returns an image that contains part of the client area of the graphics-device window. The portion of the client area that is selected is specified by the four coordinate arguments, which are given in the current virtual coordinates for the device. See section Images, for more information about manipulating images.
operation+: os2-graphics-device draw-lines xv yv
This operation draws multiple disjoint lines; it is like multiple calls
to graphics-draw-line but much faster. The arguments xv
and yv are vectors of coordinates; these vectors must be the same
length, and the length must be a multiple of two. The contents of the
vectors are alternating start/end pairs. For example, the following are
equivalent:
(graphics-draw-line device xs ys xe ye)
(graphics-operation device 'draw-lines
(vector xs xe)
(vector ys ye))
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