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- -------------------------------------
- -- graphics & sound: MSDOS version --
- -------------------------------------
-
- -- machine() commands
- constant SOUND = 1,
- LINE = 2,
- PALETTE = 3,
- PIXEL = 4,
- GRAPHICS_MODE = 5,
- CURSOR = 6,
- WRAP = 7,
- SCROLL = 8,
- SET_T_COLOR = 9,
- SET_B_COLOR =10,
- POLYGON =11,
- TEXTROWS =12,
- VIDEO_CONFIG =13
-
- -- graphics modes: argument to graphics_mode()
- -- 0 40 x 25 text, 16 grey
- -- 1 40 x 25 text, 16/8 color
- -- 2 80 x 25 text, 16 grey
- -- 3 80 x 25 text, 16/8 color
- -- 4 320 x 200, 4 color
- -- 5 320 x 200, 4 grey
- -- 6 640 x 200, BW
- -- 7 80 x 25 text, BW
- -- 11 720 x 350, BW
- -- 13 320 x 200, 16 color
- -- 14 640 x 200, 16 color
- -- 15 640 x 350, BW
- -- 16 640 x 350, 4 or 16 color
- -- 17 640 x 480, BW
- -- 18 640 x 480, 16 color
- -- 19 320 x 200, 256 color
- -- 256 640 x 400, 256 color
- -- 257 640 x 480, 256 color
- -- 258 800 x 600, 16 color
- -- 259 800 x 600, 256 color
- -- 260 1024 x 768, 16 color
- -- 261 1024 x 768, 256 color
-
- type mode(integer x)
- return (x >= -3 and x <= 19) or (x >= 256 and x <= 261)
- end type
-
- type color(integer x)
- return x >= 0 and x <= 255
- end type
-
- type boolean(integer x)
- return x = 0 or x = 1
- end type
-
- type positive_int(integer x)
- return x >= 1
- end type
-
- type point(sequence x)
- return length(x) = 2
- end type
-
- type point_sequence(sequence x)
- return length(x) >= 2
- end type
-
- global procedure draw_line(color c,
- positive_int w,
- point_sequence xyarray)
- -- draw a line connecting the 2 or more points
- -- in xyarray: {{x1, y1}, {x2, y2}, ...}
- -- using a certain color and width w
- machine_proc(LINE, {c, w, 0, xyarray})
- end procedure
-
- global procedure polygon(color c,
- positive_int w,
- boolean fill,
- point_sequence xyarray)
- -- draw a polygon
- -- 3 or more vertices are given in xyarray
- -- using a certain color and width w
- -- fill the area if fill is TRUE
- machine_proc(POLYGON, {c, w, fill, xyarray})
- end procedure
-
- global procedure pixel(color c, point p)
- -- set a pixel to a certain color
- machine_proc(PIXEL, {c, p})
- end procedure
-
- global procedure graphics_mode(mode m)
- -- set up a graphics mode
- machine_proc(GRAPHICS_MODE, m)
- end procedure
-
- global constant VC_COLOR = 1,
- VC_MODE = 2,
- VC_LINES = 3,
- VC_COLUMNS = 4,
- VC_XPIXELS = 5,
- VC_YPIXELS = 6,
- VC_NCOLORS = 7
- global function video_config()
- -- return sequence of information on video configuration
- -- {color?, mode, text lines, text columns, xpixels, ypixels, #colors}
- return machine_func(VIDEO_CONFIG, 0)
- end function
-
- -- cursor styles:
- global constant NO_CURSOR = 8192,
- UNDERLINE_CURSOR = 1543,
- BLOCK_CURSOR = 7,
- HALF_BLOCK_CURSOR = 1031
-
- global procedure cursor(integer style)
- -- choose a cursor style
- machine_proc(CURSOR, style)
- end procedure
-
- global function text_rows(positive_int rows)
- return machine_func(TEXTROWS, rows)
- end function
-
- global procedure wrap(boolean on)
- -- on = 1: characters will wrap at end of long line
- -- on = 0: lines will be truncated
- machine_proc(WRAP, on)
- end procedure
-
- global procedure scroll(integer amount)
- -- amount > 0: scroll the screen up by amount lines
- -- amount < 0: scroll down by amount lines
- machine_proc(SCROLL, amount)
- end procedure
-
- global procedure text_color(color c)
- -- set the foreground text color to c - text or graphics modes
- -- add 16 to get blinking
- machine_proc(SET_T_COLOR, c)
- end procedure
-
- global procedure bk_color(color c)
- -- set the background color to c - text or graphics modes
- machine_proc(SET_B_COLOR, c)
- end procedure
-
- type mixture(sequence s)
- return length(s) = 3 -- {red, green, blue}
- end type
-
- global function palette(color c, mixture s)
- -- choose a new mix of {red, green, blue} to be shown on the screen for
- -- color number c. Returns previous mixture as {red, green, blue}.
- return machine_func(PALETTE, {c, s})
- end function
-
- -- Sound Effects --
-
- type frequency(integer x)
- return x >= 0
- end type
-
- global procedure sound(frequency f)
- -- turn on speaker at frequency f
- -- turn off speaker if f is 0
- machine_proc(SOUND, f)
- end procedure
-
-