The Draw statement allows you to draw an object as defined in a string in the BASIC language. It is similar to the d attribute in SVG.
Overall, there are five pages to review, which are shown below as images.
The Graphics Power Diskette (or GPD) is a 1996 demonstration of some creative elements that you can produce in the BASIC language. GPD was developed in Microsoft Visual Basic for DOS (or VB for DOS), with QuickBASIC code in the backend. Yes, we said DOS.
Most of the design in splash screen were done on graph paper, then transferred to screen using the DRAW statement. Luckily, there were duplicates to reuse. With DRAW you could create sprites for games and custom backgrounds.
After you press enter, the program takes you to the main menu.
Below is the code listing for The Graphics Power Diskette.
'Filename: DEMOBAS.BAS
'Programmer: Alex Shaw III
'Purpose: Graphics Demonstration Program
'Date Created: October 1, 1996
'Last Modified: December 2, 1996
'$FORM Demo
DEFINT A-Z
'Subroutines and Functions
DECLARE SUB AllDemos ()
DECLARE SUB ArcDemo ()
DECLARE SUB BoxDemo ()
DECLARE SUB BoxFillDemo ()
DECLARE SUB Center (row, MaxCol, fgkol, bgkol, text$)
DECLARE SUB CheckVGA ()
DECLARE SUB CircleDemo ()
DECLARE SUB CircleFillDemo ()
DECLARE SUB Circles ()
DECLARE SUB ClearLines (trow, lcol, brow, rcol, kolor)
DECLARE SUB ClownFace ()
DECLARE SUB DefaultPal ()
DECLARE SUB delay (seconds!)
DECLARE SUB DemoMenu ()
DECLARE SUB DemoRoutine ()
DECLARE SUB DrawDemo ()
DECLARE SUB Ellipse ()
DECLARE SUB ExitMessage ()
DECLARE SUB ExitRoutine ()
DECLARE SUB FadePal ()
DECLARE SUB GCenter (row, MaxCol, fgkol, text$)
DECLARE SUB GetPutDemo ()
DECLARE SUB GPrtText (row, col, fgkol, text$)
DECLARE SUB GraphCenter (row, MaxCol, fgkol, text$)
DECLARE SUB GraphMode (mode, wide, rows)
DECLARE SUB GraphWindow (title$)
DECLARE SUB HatMan ()
DECLARE SUB Intro ()
DECLARE SUB KeyBuffer ()
DECLARE SUB LineBox (trow, lcol, brow, rcol, fgkol, bgkol, mkol, skol, btype)
DECLARE SUB LineDemo ()
DECLARE SUB LineTiles ()
DECLARE SUB Logo ()
DECLARE SUB Orbit ()
DECLARE SUB PaintTiles ()
DECLARE SUB PaletteChart ()
DECLARE SUB PalFadeOut ()
DECLARE SUB PalRead ()
DECLARE SUB PalStore ()
DECLARE SUB PixelDemo ()
DECLARE SUB PrtText (row, col, fgkol, bgkol, text$)
DECLARE SUB PutImage (filename$, asize, mode, xc, yc)
DECLARE SUB SampleProgRoutine ()
DECLARE SUB ScreenErrorMessage ()
DECLARE SUB SpaceShip ()
DECLARE SUB SunShine ()
DECLARE SUB TextMode (wide, rows, apage, vpage, fgkol, bgkol)
DECLARE SUB TilePatterns ()
DECLARE SUB Triangle ()
'Type Definitions
TYPE hues
red AS INTEGER
grn AS INTEGER
blu AS INTEGER
END TYPE
'Constants
CONST PI# = 3.14159265358979#
CONST FALSE = 0
CONST TRUE = NOT FALSE
'Global Variables
DIM SHARED TilePat$(1 TO 14) 'for tile patterns
DIM SHARED Pal(0 TO 255, 1 TO 3) 'store palette colors
DIM SHARED OriginalPal(0 TO 255, 1 TO 3) 'store original palette colors
TilePatternData:
DATA 255,15,0,0,255,15,0,0,255,15,0,0,255,15,0,0
DATA 255,240,0,0,255,240,0,0,255,240,0,0,255,240,0,0
DATA 15,240,0,15,15,240,0,15,15,240,0,15,15,240,0,15
DATA 15,240,0,15,15,240,0,15,15,240,0,15,15,240,0,15
DATA 0,0,0,255,0,0,0,255,0,0,0,255,0,0,0,255
DATA 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255
DATA 255,255,0,0,129,129,126,0,129,129,126,0,129,129,126,0
DATA 129,129,126,0,129,129,126,0,129,129,126,0,255,255,0,0
DATA 0,255,252,175,0,252,252,85,0,255,252,175,0,252,252,85
DATA 0,255,252,175,0,252,252,85,0,255,252,175,0,252,252,85
DATA 128,127,0,127,192,63,0,63,224,31,0,31,240,15,0,15
DATA 248,7,0,7,252,3,0,3,254,1,0,1,255,0,0,0
DATA 0,0,255,0,0,159,255,0,0,159,255,0,0,159,255,0
DATA 0,0,255,0,0,249,255,0,0,249,255,0,0,249,255,0
DATA 239,239,255,0,199,199,255,0,131,131,255,0,1,1,255,0
DATA 131,131,255,0,199,199,255,0,239,239,255,0,255,255,255,0
DATA 0,255,223,131,0,255,255,1,0,255,255,1,0,255,255,1
DATA 0,255,255,1,0,255,255,1,0,255,223,131,0,255,255,255
DATA 146,146,146,109,73,73,73,182,36,36,36,219,146,146,146,109
DATA 73,73,73,182,36,36,36,219,146,146,146,109,73,73,73,182
DATA 0,255,255,51,0,255,255,51,0,255,255,0,0,255,255,0
DATA 0,255,255,51,0,255,255,51,0,255,255,0,0,255,255,0
DATA 56,199,0,199,124,131,0,131,254,1,0,1,254,1,0,1
DATA 254,1,0,1,124,131,0,131,56,199,0,199,0,255,0,255
DATA 255,255,255,0,255,255,255,0,0,0,0,255,255,255,255,0
DATA 255,255,255,0,0,0,0,255,255,255,255,0,255,255,255,0
DATA 144,144,144,119,68,68,68,187,68,68,68,187,34,34,34,221
DATA 34,34,34,221,34,34,34,221,34,34,34,221,187,187,187,68
TriangleData:
DATA 285,185,320,230,280,205,320,245,280,220,320,260,295,220,340,260
DATA 310,220,350,260,315,195,360,240,310,190,360,230,285,185,340,230
IntroData:
DATA "This program was designed to demonstrate some of the many graphics"
DATA "features of the QuickBASIC computer programming language. Although"
DATA "most of this program was written in Visual Basic for DOS, the"
DATA "graphics routines are compatible with QuickBASIC."
DATA
DATA "There are a total of four main menu options. Currently, you are in"
DATA "the first option which is an introduction to this program. The"
DATA "second option is a graphics demonstration and the third option runs"
DATA "sample programs. Finally, the four and final main menu choice"
DATA "allows you to exit this program."
DATA "All together, there are two files which make up this program; a form"
DATA "file and a BASIC file. Both files combined have 51 routines. The"
DATA "BASIC file alone has 46 routines. Some routines were designed to"
DATA "imitate some of Turbo C's functions, especially the text routines."
DATA
DATA "I used a drawing program to draw some of the images and to create"
DATA "portions of the graphical menus. These images were saved in a"
DATA "format recognized by BASIC. This way, graphics can be loaded from"
DATA "the disk to memory, making it much faster to display graphics."
DATA
DATA "Well, enjoy this program; it is quite interesting!!!"
'AllDemos:
' All graphics demonstrations.
SUB AllDemos ()
PixelDemo 'pixel demonstration
LineDemo 'line demonstration
BoxDemo 'box demonstration
BoxFillDemo 'box fill demonstration
CircleDemo 'circle demonstration
CircleFillDemo 'circle fill demonstration
ArcDemo 'arc demonstration
GetPutDemo 'get/put demonstration
DrawDemo 'draw demonstration
LineTiles 'line tiles demonstration
PaintTiles 'paint tiles demonstration
PaletteChart 'palette chart demonstration
END SUB
'ArcDemo:
' Arc demonstration.
SUB ArcDemo ()
GraphWindow "Arc Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key pressed
DO 'aspect ratio loop
XStart! = RND * 6 'arc starts
XEnd! = RND * 6 'arc ends
LOOP UNTIL XEnd! < XStart! 'end is less than start
CIRCLE (RND * 639, RND * 479), RND * 300 + 10, RND * 16, -XStart!, -XEnd!
LOOP 'end keypress loop
END SUB
'BoxDemo:
' Box demonstration.
SUB BoxDemo ()
GraphWindow "Box Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
LINE -(RND * 639, RND * 479), RND * 16, B 'draw random box
LOOP 'end keypress loop
END SUB
'BoxFillDemo:
' Box fill demonstration.
SUB BoxFillDemo ()
GraphWindow "Box Fill Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
LINE -(RND * 639, RND * 479), RND * 16, BF 'draw box filled
LOOP 'end keypress loop
END SUB
'Center:
' Centers text at a given row with color.
'parameters:
' row - row
' MaxCol - maximum column
' fgkol - foreground color
' bgkol - background color
' text$ - text to print
SUB Center (row, MaxCol, fgkol, bgkol, text$)
col = MaxCol / 2 - LEN(text$) / 2 'define column
PrtText row, col, fgkol, bgkol, text$ 'print text
END SUB
'CheckVGA:
' Checks the highest VGA mode used in this program.
SUB CheckVGA ()
ON LOCAL ERROR GOTO BadMode 'print message in case of error
SCREEN.HIDE 'hide screen
SCREEN 13 'try to switch to VGA mode
EXIT SUB
BadMode: 'routine to print error message
ScreenErrorMessage 'print screen error message
END 'end program
END SUB
'CircleDemo:
' Circle demonstration.
SUB CircleDemo ()
GraphWindow "Circle Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
CIRCLE (RND * 639, RND * 479), RND * 300 + 10, RND * 16 'draw circle
LOOP 'end keypress loop
END SUB
'CircleFillDemo:
' Circle fill with paint demonstration.
SUB CircleFillDemo ()
GraphWindow "Circle Fill Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
xc = RND * 639 'initialize X-coordinate
yc = RND * 479 'initialize Y-coordinate
kolor = RND * 16 'initialize color
CIRCLE (xc, yc), RND * 300 + 10, kolor 'draw circle
PAINT (xc, yc), RND * 16, kolor 'fill circle with paint
LOOP 'end keypress loop
END SUB
'Circles:
' Circle program.
SUB Circles ()
GraphWindow "Color Circles Program" 'graphics window
FOR radius = 10 TO 500 STEP 5 'radius sizes from 10-500
FOR xc = 2 TO 637 STEP 635 'X-coordinate values
yc = 0 'initialize Y-coordinate
FOR number = 1 TO 2 'for two circles
CIRCLE (xc, yc), radius, 15 * RND + 1 'draw circle
yc = yc + 445 'increase Y-coordinate
NEXT 'next circle
NEXT 'next X-coordinate
NEXT 'next radius number
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get any key
END SUB
'ClearLines:
' Clears a certain amount of lines in text mode.
'parameters:
' trow - top row
' lcol - left column
' brow - bottom row
' rcol - right column
' kolor - color
SUB ClearLines (trow, lcol, brow, rcol, kolor)
line$ = STRING$(rcol - lcol - 1, 219) 'define clearing line
FOR row = trow TO brow 'from top to bottom
PrtText row, lcol, kolor, 0, line$ 'print line
NEXT 'next line
END SUB
'ClownFace:
' Displays a clown face.
SUB ClownFace ()
GraphMode 12, 80, 30 'set graphics mode
GraphCenter 10, 80, 15, "Press any key to view clown face:"
GraphCenter 11, 80, 15, "Press any key when ready to return to menu."
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get any key
PutImage "CLOWN16.SCR", 32500, 7, 0, 0 'place image to screen
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get any key
END SUB
'DefaultPal:
' Sets the default palette for this program for screen mode 13.
SUB DefaultPal ()
DIM VPal(255) AS hues 'allocate storage space
SCREEN 13 'change mode
DEF SEG = VARSEG(VPal(0)) 'point to array's segment address
BLOAD "VGA13.PAL", 0 'load palette into array
DEF SEG 'point to BASIC's segment address
OUT &H3C8, 0 'inform VGA
FOR atrib = 0 TO 255 'entire palette
OUT &H3C9, VPal(atrib).red 'send red component
OUT &H3C9, VPal(atrib).grn 'send green component
OUT &H3C9, VPal(atrib).blu 'send blue component
NEXT 'next attribute
END SUB
'Delay:
' Pauses execuation for a number of seconds or less.
'parameters:
' seconds - seconds or less to pause
SUB delay (seconds!)
StartTime! = TIMER 'initialize start time
DO 'start loop
LOOP UNTIL (TIMER - StartTime!) >= seconds! 'end loop if true
END SUB
'DemoMenu:
' Creates menu for graphics demonstration.
SUB DemoMenu ()
DefaultPal 'load palette for images
PutImage "DEMOMEN1.IMG", 31200, 12, 56, 40 'place first menu portion
PutImage "DEMOMEN2.IMG", 31200, 12, 317, 40 'place second menu portion
PutImage "DEMOMEN3.IMG", 10000, 12, 56, 281 'place third menu portion
PutImage "DEMOPRPT.IMG", 12500, 12, 124, 402 'place prompt
END SUB
'DemoRoutine:
' Routine for graphics demonstration.
SUB DemoRoutine ()
ValStr$ = "ABCDEFGHIJKLMabcdefghijklm" 'valid input string
done = FALSE 'loop controlling variable
DO WHILE NOT done 'start main loop
DO 'start choice loop
DemoMenu 'creates demonstration menu
KeyBuffer 'clear keyboard buffer
a$ = INPUT$(1) 'get choice
SELECT CASE ASC(a$) 'check choice
CASE 27 'user pressed Esc
done = TRUE 'change loop controlling variable
CASE 65, 97 'user pressed A or a
PixelDemo 'pixel demonstration
CASE 66, 98 'user pressed B or b
LineDemo 'line demonstration
CASE 67, 99 'user pressed C or c
BoxDemo 'box demonstration
CASE 68, 100 'user pressed D or d
BoxFillDemo 'box fill demonstration
CASE 69, 101 'user pressed E or e
CircleDemo 'circle demonstration
CASE 70, 102 'user pressed F or f
CircleFillDemo 'circle fill demonstration
CASE 71, 103 'user pressed G or g
ArcDemo 'arc demonstration
CASE 72, 104 'user pressed H or h
GetPutDemo 'get/put demonstration
CASE 73, 105 'user pressed I or i
DrawDemo 'draw demonstration
CASE 74, 106 'user pressed J or j
LineTiles 'line tiles demonstration
CASE 75, 107 'user pressed K or k
PaintTiles 'paint tiles demonstration
CASE 76, 108 'user pressed L or l
PaletteChart 'palette chart demonstration
CASE 77, 109 'user pressed M or m
AllDemos 'display all demonstrations
END SELECT 'end checking
LOOP UNTIL ASC(a$) = 27 OR INSTR(a$, ValStr$) <> 0 'ending loop check
LOOP 'end main loop
TextMode 80, 25, 0, 0, 7, 0 'return to text mode
END SUB
'DrawDemo:
' Demonstration for the DRAW statement.
SUB DrawDemo ()
GraphWindow "Draw Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
box$ = "u3r3d3l3" 'define box string
FOR number = 1 TO 255 STEP 5
DRAW "BM320,240;S=" + VARPTR$(number) 'position and set scale
FOR Angle = -360 TO 360 STEP 45 'turn angles
kolor = RND * 16 'set color
DRAW "TA=" + VARPTR$(Angle) + "C=" + VARPTR$(kolor) + box$ 'draw box
NEXT 'next angle
NEXT 'next scale height
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get any key
END SUB
'Ellipse:
' Draws an ellipse.
SUB Ellipse ()
GraphWindow "Color Ellipses Program" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
kolor = 15 * RND + 1 'initialize color
FOR ratio! = .7 TO 0 STEP -.05 'for ratios .7 to 0
CIRCLE (320, 223), 300, kolor, , , ratio! 'draw ellipse
NEXT 'next ratio value
LOOP 'end keypress loop
END SUB
'ExitMessage:
' Prints the exit message for the program.
SUB ExitMessage ()
SCREEN.HIDE 'hide screen
TextMode 80, 25, 0, 0, 7, 0 'clear screen
LineBox 7, 8, 14, 71, 14, 1, 1, 3, 2 'create box
Center 7, 80, 15, 1, " Exit Message "
Center 9, 80, 10, 1, "Thank you for using this demonstration program."
Center 10, 80, 10, 1, "Look for my next creation in the near future."
Center 12, 80, 10, 1, "Bye!!!"
PrtText 13, 1, 7, 0, "" 'for location purpose
END 'end program
END SUB
'ExitRoutine:
' Creates an exit routine for the program.
SUB ExitRoutine ()
LineBox 9, 8, 15, 73, 10, 1, 1, 3, 2 ' create box
Center 9, 80, 15, 1, " Exit Prompt " ' title
Center 11, 80, 14, 1, "Do you really want to exit this program?" ' prompt 1
Center 13, 80, 14, 1, "Press <Y> for Yes or <N> for No:" ' prompt 2
done = FALSE 'initialize loop controlling variable
DO WHILE NOT done 'start loop
KeyBuffer 'clear keyboard buffer
ExitKey$ = INPUT$(1) 'get key
SELECT CASE ASC(ExitKey$) 'check choice
CASE 27 'user pressed Esc key
done = TRUE 'change variable to exit loop
CASE 89, 121 'user pressed Y or y
ExitMessage 'print exit message and end program
CASE 78, 110 'user pressed N or n
done = TRUE 'change variable to exit loop
END SELECT 'end choice checking
LOOP 'end loop
Demo.SHOW 'display Demo form
END SUB
'FadePal:
' Fades a 256 color palette out.
SUB FadePal ()
PalRead 'read the current palette colors
PalStore 'store the current palette colors
PalFadeOut 'fades out all 256 colors to black
END SUB
'GCenter:
' Centers text at a given row with color in graphics mode.
'parameters:
' row - row
' MaxCol - maximum column
' fgkol - foreground color
' text$ - text to print
SUB GCenter (row, MaxCol, fgkol, text$)
col = MaxCol / 2 - LEN(text$) / 2 'define column
GPrtText row, col, fgkol, text$ 'print text
END SUB
'GetPutDemo:
' Gets and puts an object on the screen.
SUB GetPutDemo ()
DIM image(500) 'allocate space
GraphWindow "Get/Put Demostration" 'graphics window
CIRCLE (320, 240), 15, 4 'draw circle one
PAINT (320, 240), 4, 4 'paint circle one
CIRCLE (320, 240), 7, 3 'draw circle two
PAINT (320, 240), 3, 3 'paint circle two
GET (305, 225)-(335, 255), image 'store image
CLS 'clear screen
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'start keypress loop
xc = RND * 600 'initialize X-coordinate
yc = RND * 400 'initialize Y-coordinate
PUT (xc, yc), image, XOR 'place image
delay .2 'delay
PUT (xc, yc), image, XOR 'remove image
LOOP 'end keypress loop
END SUB
'GPrtText:
' Prints text at a given location with color in graphics mode.
'parameters:
' row - row
' col - column
' fgkol - foreground color
' text$ - text to be printed to screen
SUB GPrtText (row, col, fgkol, text$)
LOCATE row, col 'set location
COLOR fgkol 'set color
PRINT text$; 'print text
END SUB
'GraphCenter:
' Centers text in graphics mode at a given row with color.
'parameters:
' row - row
' MaxCol - maximum column
' fgkol - foreground color
' text$ - text to print
SUB GraphCenter (row, MaxCol, fgkol, text$)
col = MaxCol / 2 - LEN(text$) / 2 'define column
LOCATE row, col 'position cursor
COLOR fgkol 'set foreground color
PRINT text$; 'print text
END SUB
'GraphMode:
' Switches to a graphics mode.
'parameters:
' mode - graphics mode
' wide - width of screen
' rows - number of rows
SUB GraphMode (mode, wide, rows)
SCREEN mode 'change screen mode
WIDTH wide, rows 'set dimensions
VIEW 'clear viewport
CLS 'clear screen
END SUB
'GraphWindow:
' Creates a window in mode 12 (VGA) to view graphics.
'parameters:
' title$ - title of the graphics window
SUB GraphWindow (title$)
GraphMode 12, 80, 30 'switch to graphics mode
GraphCenter 1, 80, 15, title$ 'center title
LINE (0, 0)-(639, 463), 7, B 'outer border line
LINE (0, 14)-(639, 14), 7 'title dividing line
VIEW (2, 16)-(637, 461) 'area to view graphics
END SUB
'HatMan:
' Animation program.
SUB HatMan ()
REDIM HatMan1(800), HatMan2(800) 'allocate storage space
GraphWindow "Hat-Man Animation Program" 'display graphics window
PutImage "HATMAN1.IMG", 800, 12, 302, 215 'place first hat-man
GET (302, 215)-(339, 258), HatMan1 'store first hat-man
CLS 'clear viewport
PutImage "HATMAN2.IMG", 800, 12, 302, 215 'place second hat-man
GET (302, 215)-(339, 258), HatMan2 'store first hat-man
CLS 'clear viewport
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
xc = 586 'initialize X-coordinate
DO WHILE INKEY$ = "" 'do until key is pressed
PUT (xc, 215), HatMan2, XOR 'place second hat-man
delay .3 'pause
PUT (xc, 215), HatMan2, XOR 'remove second hat-man
PUT (xc - 38, 215), HatMan1, XOR 'place first hat-man
delay .3 'pause
PUT (xc - 38, 215), HatMan1, XOR 'remove first hat-man
xc = xc - 76 'decrease X-coordinate
IF xc <= 16 THEN xc = 586 'check X-coordinate
LOOP 'end keypress loop
END SUB
'Intro:
' Prints introduction words.
SUB Intro ()
TextMode 80, 25, 0, 0, 7, 1 'switch to text mode
PrtText 5, 6, 15, 1, "Introduction" 'print title
PrtText 6, 6, 7, 1, STRING$(69, 205) 'dividing line
Center 24, 80, 15, 1, "Press any key to continue..." 'print prompt
row = 8 'initialize start row
RESTORE IntroData 'set data pointer
FOR number = 1 TO 21 'print nine lines
READ text$ 'read text data
PrtText row, 6, 15, 1, text$ 'print text
row = row + 1
IF number = 10 THEN 'check number
row = 8 'define starting row
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get a key
ClearLines 8, 6, 17, 77, 1 'clear lines
END IF 'end checking
NEXT 'next line
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get a key
END SUB
'KeyBuffer:
' Clears the keyboard buffer of any keystrokes.
SUB KeyBuffer ()
DEF SEG = 0 'point to low memory address
POKE 1050, PEEK(1052) 'clear buffer
DEF SEG 'return to default segment address
END SUB
'LineBox:
' Creates a box using ASCII line-drawing characters.
'parameters:
' trow - top row
' lcol - left column
' brow - bottom row
' rcol - right column
' fgkol - foreground color
' bgkol - background color
' mkol - middle fill color
' skol - shadow color
' btype - box type
' first type - single across; single down
' second type - double across; double down
' third type - single across; double down
' fourth type - double across; single down
SUB LineBox (trow, lcol, brow, rcol, fgkol, bgkol, mkol, skol, btype)
SELECT CASE btype 'define box characters
CASE 1 'single across; single down
ulc = 218 ' upper-left-corner
urc = 191 ' upper-right-corner
blc = 192 ' bottom-left-corner
brc = 217 ' bottom-right-corner
ver = 179 ' vertical character
hor = 196 ' horizontal character
CASE 2 'double across; double down
ulc = 201
urc = 187
blc = 200
brc = 188
ver = 186
hor = 205
CASE 3 'single across; double down
ulc = 214
urc = 183
blc = 211
brc = 189
ver = 186
hor = 196
CASE 4 'double across; single down
ulc = 213
urc = 184
blc = 211
brc = 190
ver = 179
hor = 205
END SELECT
TopRow$ = CHR$(ulc) + STRING$(rcol - lcol - 1, hor) + CHR$(urc) 'top row
BotRow$ = CHR$(blc) + STRING$(rcol - lcol - 1, hor) + CHR$(brc) 'bottom row
PrtText trow, lcol, fgkol, bgkol, TopRow$ 'top row
FOR row = trow + 1 TO brow - 1 'top to bottom
PrtText row, lcol, fgkol, bgkol, CHR$(ver) 'vertical character
PrtText row, lcol + 1, mkol, 0, STRING$(rcol - lcol - 1, 219) 'mid-fill
PrtText row, rcol, fgkol, bgkol, CHR$(ver) 'vertical character
PrtText row, rcol + 1, skol, 0, CHR$(219) 'shadow character
NEXT 'next line
PrtText brow, lcol, fgkol, bgkol, BotRow$ 'bottom row
PrtText brow, rcol + 1, skol, 0, CHR$(219) 'shadow character
PrtText brow + 1, lcol + 1, skol, 0, STRING$(rcol - lcol + 1, 219) 'shadow
END SUB
'LineDemo:
' Line demonstration.
SUB LineDemo ()
GraphWindow "Line Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
LINE -(RND * 639, RND * 479), RND * 16 'draw line
LOOP
END SUB
'LineTiles:
' Creates line tile patterns.
SUB LineTiles ()
DIM LTile(1 TO 12) 'allocate storage space
LTile(1) = &HFFFF 'line tile 1
LTile(2) = &HEEEE 'line tile 2
LTile(3) = &HDDDD 'line tile 3
LTile(4) = &H1111 'line tile 4
LTile(5) = &HFFCC 'line tile 5
LTile(6) = &HE724 'line tile 6
LTile(7) = &HF0F0 'line tile 7
LTile(8) = &H6A6A 'line tile 8
LTile(9) = &HABCD 'line tile 9
LTile(10) = &H45AC 'line tile 10
LTile(11) = &HBFBF 'line tile 11
LTile(12) = &H4545 'line tile 12
GraphWindow "User-Defined Line Tile Patterns" 'graphics window
row = 4 'initialize row
yc = 40 'initialize Y-coordinate
FOR number = 1 TO 12 'twelve line tiles
LINE (50, yc)-(550, yc), 2, , LTile(number) 'draw line with tile
GPrtText row, 70, 15, STR$(number) 'print tile number
row = row + 2 'increase row
yc = yc + 32 'increase Y-coordinate
NEXT 'next tile number
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get a key
END SUB
'Logo:
' Create graphical logo.
SUB Logo ()
SCREEN.HIDE 'hide screen
DefaultPal 'define palette for mode 13
PutImage "LOGO.SCR", 32500, 13, 0, 0 'load and place image
KeyBuffer 'clear keyborad buffer
AnyKey$ = INPUT$(1) 'get any keystroke
TextMode 80, 25, 0, 0, 7, 0 'switch to text mode
SCREEN.SHOW 'hide screen to show form
END SUB
'Orbit:
' Rotates a ball in a circle.
SUB Orbit ()
DIM planet(500) 'allocate storage space
GraphWindow "Orbit Program" 'display grahics window
CIRCLE (320, 240), 10, 1 'draw circle to move
PAINT (320, 240), 3, 1 'paint that circle
GET (309, 229)-(331, 251), planet 'store image
FOR number = 1 TO 3000 'place 3000 pixels
PSET (RND * 639, RND * 479), 7 'put pixel
NEXT 'next number
CIRCLE (320, 240), 161, 2, , , .13 'draw ring
CIRCLE (320, 240), 12, 14 'draw yellow circle
PAINT (320, 240), 14, 14 'paint yellow circle
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
x# = -PI 'initialize turn angle
DO WHILE INKEY$ = "" 'do until key is pressed
r# = 160 * COS(x#) 'initialize radius
y# = SIN(x#) 'initialize Y-coordinate
yo# = y# / (PI# / 60) 'Y-coordinate offset
PUT (317 + r#, 228 + yo#), planet, XOR 'place planet to screen
FOR pause = 1 TO 1300 'pause
NEXT 'next pause number
PUT (317 + r#, 228 + yo#), planet, XOR 'remover image
x# = x# + .01 'increase PI angle
IF x# >= PI THEN x# = -PI 'check PI angle
LOOP 'end keypress loop
END SUB
'PaintTiles:
' Displays tile patterns in VGA mode.
SUB PaintTiles ()
GraphWindow "User-Defined Paint Tile Patterns" 'create graphics window
row = 9 'initialize row
number = 1 'initialize tile number
FOR yc = 24 TO 366 STEP 135 'Y positions
col = 10 'initialize column number
FOR xc = 30 TO 580 STEP 150 'X positions
LINE (xc, yc)-(xc + 100, yc + 85), 7, B 'draw box
PAINT (xc + 5, yc + 5), TilePat$(number), 7 'paint box
GPrtText row, col, 15, STR$(number) 'print tile number
col = col + 19 'increase column number
number = number + 1 'increase tile number
NEXT 'next X position
row = row + 9 'increase row
NEXT 'next Y position
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get any key
END SUB
'PaletteChart:
' Creates a chart of palette colors.
SUB PaletteChart ()
GraphMode 13, 40, 25 'graphics mode
GraphCenter 2, 40, 7, "PALETTE CHART" 'print title
FOR yc = 54 TO 144 STEP 6 'Y-coordinate values
FOR xc = 8 TO 294 STEP 19 'X-coordinate values
LINE (xc, yc)-(xc + 17, yc + 4), kolor, BF 'draw line
kolor = kolor + 1 'increment kolor
NEXT 'next X-coordinate
NEXT 'next Y-coordinate
GraphCenter 24, 40, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear key buffer
AnyKey$ = INPUT$(1) 'get a key
END SUB
'PalFadeOut:
' Fade all 256 colors to black.
SUB PalFadeOut ()
FOR numberofshade = 0 TO 63 '64 shades
FOR colornum = 0 TO 255 '256 colors
OUT &H3C8, colornum 'place color into VGA port
FOR attribute = 1 TO 3 '3 attributes
OUT &H3C9, Pal(colornum, attribute) 'send color components
IF Pal(colornum, attribute) > 0 THEN
Pal(colornum, attribute) = Pal(colornum, attribute) - 1
END IF
NEXT attribute 'next attribute
NEXT colornum 'next color
NEXT numberofshade
END SUB
'PalRead:
' Read the color values currently stored in the video card.
SUB PalRead ()
FOR colornum = 0 TO 255 'read 256 colors
OUT &H3C7, colornum 'color number
Pal(colornum, 1) = INP(&H3C9) 'get red value from video card
Pal(colornum, 2) = INP(&H3C9) 'get green value from video card
Pal(colornum, 3) = INP(&H3C9) 'get blue value from video card
NEXT colornum 'next color
END SUB
'PalStore:
' Stores the current palette.
SUB PalStore ()
'Because we'll be changing the values in the video card, we'll want to
'store those present in the array, OriginalPal(). This way, after making
'whatever changes in the colors, we can always fade back to the older
'palette we saved here.
FOR colornum = 0 TO 255 '256 color palette
OUT &H3C7, colornum 'color number
OriginalPal(colornum, 1) = INP(&H3C9) 'get red value from video card
OriginalPal(colornum, 2) = INP(&H3C9) 'get green value from video card
OriginalPal(colornum, 3) = INP(&H3C9) 'get blue value from video card
NEXT colornum 'next color
END SUB
'PixelDemo:
' Pixel demonstration.
SUB PixelDemo ()
GraphWindow "Pixel Demonstration" 'graphics window
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
DO WHILE INKEY$ = "" 'do until key is pressed
PSET (RND * 639, RND * 479), RND * 16 'place pixel
PRESET (RND * 639, RND * 479) 'place or remove pixel
LOOP
END SUB
'PrtText:
' Prints text at a given location with color.
'parameters:
' row - row
' col - column
' fgkol - foreground color
' bgkol - background color
' text$ - text to be printed to screen
SUB PrtText (row, col, fgkol, bgkol, text$)
LOCATE row, col 'set location
COLOR fgkol, bgkol 'set color
PRINT text$; 'print text
END SUB
'PutImage:
' Loads and places an image on the screen.
'parameters:
' filename$ - filename
' asize - array size
' mode - screen mode
' xc - x-coordinate
' yc - y-coordinate
SUB PutImage (filename$, asize, mode, xc, yc)
SCREEN mode 'set proper screen mode
REDIM image(asize) 'allocate storage for image
DEF SEG = VARSEG(image(0)) 'point to image's segment address
BLOAD filename$, VARPTR(image(0)) 'load image into array
DEF SEG 'point to BASIC's segment address
PUT (xc, yc), image, PSET 'place image onto screen
END SUB
'SampleProgRoutine:
' Creates routine for sample programs' menu.
SUB SampleProgRoutine ()
done = FALSE 'loop controlling variable
DO WHILE NOT done 'start main loop
DO 'start choice loop
DefaultPal 'set default image palette
PutImage "PROGMENU.SCR", 32500, 13, 0, 0 ' display menu screen
KeyBuffer 'clear keyboard buffer
a$ = INPUT$(1) 'get choice
SELECT CASE ASC(a$) 'check choice
CASE 27 'user pressed <Esc>
done = TRUE 'change controlling variable
CASE 49 'user pressed 1
SunShine 'sunshine program
CASE 50 'user pressed 2
Ellipse 'color ellipses program
CASE 51 'user pressed 3
Circles 'color circles program
CASE 52 'user pressed 4
Orbit 'rotates a ball
CASE 53 'user pressed 5
HatMan 'hat-man animation program
CASE 54 'user pressed 6
Triangle 'triangle lost in space program
CASE 55 'user pressed 7
SpaceShip 'space ship program
CASE 56 'user pressed 8
ClownFace 'clown face program
END SELECT 'end checking
LOOP UNTIL ASC(a$) = 27 OR (ASC(a$) > 0 AND ASC(a$) < 9) ' check choice
LOOP 'end main loop
TextMode 80, 25, 0, 0, 7, 0 'switch to text mode
END SUB
'ScreenErrorMessage:
' Prints screen error message.
SUB ScreenErrorMessage ()
TextMode 80, 25, 0, 0, 7, 0 'switch to text mode
LineBox 8, 9, 14, 71, 15, 4, 4, 3, 2 'create box
Center 8, 80, 15, 4, " Screen Error Message "
Center 10, 80, 14, 4, "Your computer does not support VGA graphics."
Center 11, 80, 14, 4, "Sorry, but this program depends on it."
Center 12, 80, 14, 4, "Bye!!!"
END SUB
'SpaceShip:
' Flys a space ship across the screen.
SUB SpaceShip ()
REDIM image1(750), image2(750) 'allocate storage
DefaultPal 'set image palette
PutImage "SHIP1.IMG", 750, 13, 0, 0 'place image one
GET (0, 0)-(48, 29), image1 'store image one
PutImage "SHIP2.IMG", 750, 13, 50, 0 'place image two
GET (50, 0)-(98, 29), image2 'store image two
CLS 'clear screen
GraphCenter 2, 40, 7, "Flying Saucer Program" 'graphics window
GraphCenter 24, 40, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear key buffer
xc = 200 'initialize X-coor
yc = 100 'initialize Y-coor
DO WHILE INKEY$ = "" 'do until keypress
ImageNum = RND * 1 'initialize image num
IF ImageNum = 0 THEN 'check image number
PUT (xc, yc), image1, XOR 'place image one
delay .21 'delay
PUT (xc, yc), image1, XOR 'remove image one
ELSE 'else
PUT (xc, yc), image2, XOR 'place image two
delay .21 'delay
PUT (xc, yc), image2, XOR 'remove image two
END IF 'end image check
ry = RND * 1 'assign y-direction
IF ry = 0 THEN yc = yc - 7 ELSE yc = yc + 7 'y goes up or down
xc = xc - 7 'decrement X-coor
IF xc <= 1 THEN xc = 260 'check X-coordinate
IF yc <= 1 THEN yc = 160 'check Y-coordinate
IF yc >= 160 THEN yc = 1 'check Y-coordinate
LOOP 'end keypress loop
END SUB
'SunShineProg:
' Rotates box to create sun shine picture.
SUB SunShine ()
GraphWindow "Sunshine Reflection Program" 'graphics window
box$ = "R635D445L635U445" 'box string
FOR number = 90 TO 1 STEP -1 'start at 90 degrees
DRAW "BM2,16 C14 TA=" + VARPTR$(Angle) + box$ 'draw box at angle
Angle = Angle + 1 'increase angle number
NEXT 'next box number
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
AnyKey$ = INPUT$(1) 'get any key
END SUB
'TextMode:
' Switches to text mode.
'parameters:
' wide - width of screen
' rows - number of rows
' apage - active page
' vpage - visual page
' bgkol - background color
' fgkol - foreground color
SUB TextMode (wide, rows, apage, vpage, fgkol, bgkol)
SCREEN 0, 1, apage, vpage 'change screen mode
WIDTH wide, rows 'set screen dimensions
COLOR fgkol, bgkol 'set color
CLS 'clear screen
END SUB
'TilePatterns:
' Define tile patterns.
SUB TilePatterns ()
DIM row$(1 TO 8) 'temporary row holder
RESTORE TilePatternData 'set pointer
FOR TileNumber = 1 TO 14 '14 tile patterns
temp$ = "" 'set temp variable to null
FOR number = 1 TO 8 'eight rows create one tile
READ tn1, tn2, tn3, tn4 'read tile number
row$(number) = CHR$(tn1) + CHR$(tn2) + CHR$(tn3) + CHR$(tn4)
temp$ = temp$ + row$(number) 'increment temporary holder
NEXT 'next number
TilePat$(TileNumber) = temp$ 'define tile pattern
NEXT 'next tile number
END SUB
'Triangle:
' Rotates a triangle through space.
SUB Triangle ()
RANDOMIZE TIMER 'randomize generator
REDIM image(4500) 'allocate space
GraphWindow "Triangle Lost In Space Program" 'display graphics window
Tri$ = "BM320,240C14L30M+15,-35NM+15,+35BD5P14,14" 'triangle string
RESTORE TriangleData 'set data pointer
number = 0 'initialize image number
FOR Angle = 0 TO 315 STEP 45 'turn angles
READ XC1, YC1, XC2, YC2 'read coordinates
DRAW "TA=" + VARPTR$(Angle) + Tri$ 'draw triangle at angle
GET (XC1, YC1)-(XC2, YC2), image(number) 'store triangle
CLS 'clear viewport
number = number + 500 'increase image number
NEXT 'next angle
FOR number = 1 TO 3000 '3000 pixels to place
PSET (RND * 639, RND * 479), 7 'place random pixel
NEXT 'next number
GCenter 30, 80, 15, "Press any key to continue..." 'print prompt
KeyBuffer 'clear keyboard buffer
xc = 580 'initialize X-coordinate
yc = 215 'initialize Y-coordinate
ImageNum = 0 'initialize image number
DO WHILE INKEY$ = "" 'do until key is pressed
PUT (xc, yc), image(ImageNum), XOR 'place image
delay .21 'pause
PUT (xc, yc), image(ImageNum), XOR 'remove image
rx = RND * 1 'initialize X-direction
ry = RND * 1 'initialize Y-direction
IF rx = 0 THEN xc = xc - 15 ELSE xc = xc + 15 'check X-direction
IF ry = 0 THEN yc = yc - 15 ELSE yc = yc + 15 'check Y-direction
ImageNum = ImageNum + 500 'increase image number
IF ImageNum >= 4000 THEN ImageNum = 0 'check image number
IF xc <= 5 THEN xc = 580 'check X-coordinate
IF yc <= 5 THEN yc = 395 'check Y-coordinate
IF xc >= 580 THEN xc = 5 'check X-coordinate
IF yc >= 395 THEN yc = 5 'check Y-coordinate
LOOP 'end keypress loop
END SUB