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ugBASIC User Manual
PURPOSE
SOURCE CODE
INK BROWN
CLS
COLOR BORDER LIGHT BLUE
CONST POSITIVE maxWalls = 3
CONST POSITIVE windowHeight = 3
CONST POSITIVE maxobjects = 4
title = LOAD TILES("examples/scrolling_title.png") TRANSPARENT
titleX = ( SCREEN TILES WIDTH - TILES WIDTH( title ) ) \ 2
titleY = ( SCREEN TILES HEIGHT - TILES HEIGHT( title ) ) \ 2
titleCycle = 0
DO
ADD titleCycle, 1, 0 TO 5000
IF titleCycle = 0 THEN
INK BROWN
PUT TILE title AT titleX, titleY
ELSE IF titleCycle = 2500 THEN
INK RED
PUT TILE title AT titleX, titleY
ENDIF
IF (titleCycle = 0) OR (titleCycle=2500) THEN
INK YELLOW
LOCATE , titleY + TILES HEIGHT(title) + 2: CENTER "press any key"
ELSE IF (titleCycle = 1250) OR (titleCycle=3750) THEN
LOCATE , titleY + TILES HEIGHT(title) + 2: CLINE
ENDIF
IF SCANCODE > 0 THEN
EXIT
ENDIF
LOOP
INK BROWN
basement = LOAD TILES("examples/scrolling_basement.png") TRANSPARENT
DIM wall AS TILES(maxWalls)
wall(0) = LOAD TILES("examples/scrolling_wall0.png") TRANSPARENT
wall(1) = LOAD TILES("examples/scrolling_wall1.png") TRANSPARENT
wall(2) = LOAD TILES("examples/scrolling_wall2.png") TRANSPARENT
DIM window AS TILES(windowHeight)
window(0) = LOAD TILES("examples/scrolling_window0.png") TRANSPARENT
window(1) = LOAD TILES("examples/scrolling_window1.png") TRANSPARENT
window(2) = LOAD TILES("examples/scrolling_window2.png") TRANSPARENT
player = CSPRITE(LOAD IMAGE("examples/scrolling_player0.png"))
DIM object AS SPRITE(maxobjects)
object(0) = SPRITE(LOAD IMAGE("examples/scrolling_arrow.png") MULTICOLOR)
object(1) = SPRITE(LOAD IMAGE("examples/scrolling_barrel.png") MULTICOLOR)
object(2) = SPRITE(LOAD IMAGE("examples/scrolling_chair.png") MULTICOLOR)
object(3) = SPRITE(LOAD IMAGE("examples/scrolling_barrel.png") MULTICOLOR)
DIM objectX AS POSITION(maxobjects)
objectX(0) = 0
objectX(1) = 0
DIM objectY AS POSITION(maxobjects)
objectY(0) = 0
objectY(1) = 0
DIM objectSpeed AS POSITION(maxobjects)
objectSpeed(0) = 0
objectSpeed(1) = 0
rowIndex = 0
windowIndex = 0
playerIndex = 0
playerX = ( SCREEN WIDTH - SPRITE WIDTH ) \ #2
playerY = SCREEN HEIGHT - SPRITE HEIGHT - TILES HEIGHT(basement)
GLOBAL wall
GLOBAL window
GLOBAL rowIndex
GLOBAL windowIndex
GLOBAL player
GLOBAL playerIndex
GLOBAL playerX
GLOBAL playerY
GLOBAL objectX
GLOBAL objectY
GLOBAL objectSpeed
GLOBAL object
PARALLEL PROCEDURE moveobject
[objectX] = RND(SCREEN WIDTH - SPRITE WIDTH - 1)
[objectY] = 1
[objectSpeed] = 3 + RND(5)
IF RANDOM BYTE < 64 THEN
[object] = SPRITE(LOAD IMAGE("examples/scrolling_arrow.png"), [object] MULTICOLOR)
ELSE IF RANDOM BYTE < 128 THEN
[object] = SPRITE(LOAD IMAGE("examples/scrolling_chair.png"), [object] MULTICOLOR)
ELSE IF RANDOM BYTE < 192 THEN
[object] = SPRITE(LOAD IMAGE("examples/scrolling_hammer.png"), [object] MULTICOLOR)
ELSE
[object] = SPRITE(LOAD IMAGE("examples/scrolling_barrel.png"), [object] MULTICOLOR)
ENDIF
WHILE [objectY] > 0
IF COLLISION(player) THEN
playerY = playerY + [objectSpeed]
ENDIF
ADD [objectY], [objectSpeed], 0 TO SCREEN HEIGHT + SPRITE HEIGHT
SPRITE [object] AT [objectX],[objectY] ENABLE
WEND
SPRITE [object] DISABLE
END PROC
DIM objectThread AS THREAD(maxobjects)
objectThread(0) = HALTED SPAWN moveobject
objectThread(1) = HALTED SPAWN moveobject
objectThread(2) = HALTED SPAWN moveobject
objectThread(3) = HALTED SPAWN moveobject
PROCEDURE refreshRow
x = (BYTE) 0
IF rowIndex > 0 THEN
DRAW TILES wall(rowIndex) ROW 0, 0 TO rowIndex - 1
ENDIF
DRAW TILES wall(rowIndex) ROW 0, rowIndex TO SCREEN TILES WIDTH - 1
IF windowIndex > 4 THEN
w = TILES WIDTH(window(windowIndex-5))
x = 4
DRAW TILES window(windowIndex-5) ROW 0, x TO x + w - 1
ADD x, w ** #2
DRAW TILES window(windowIndex-5) ROW 0, x TO x + w - 1
ADD x, w ** #2
DRAW TILES window(windowIndex-5) ROW 0, x TO x + w - 1
ENDIF
ADD rowIndex, 1, 0 TO 2
ADD windowIndex, 1, 0 TO 7
ADD playerIndex, 1, 0 TO 1
IF playerIndex = 0 THEN
player = CSPRITE(LOAD IMAGE("examples/scrolling_player0.png"), player)
ELSE
player = CSPRITE(LOAD IMAGE("examples/scrolling_player1.png"), player)
ENDIF
IF ( playerY > 0 ) AND ( windowIndex = 7 ) THEN
DEC playerY
DEC playerY
ENDIF
END PROC
SCREEN ROWS 24
SCROLL DOWN
DRAW TILES basement ROW 0, 0 TO SCREEN TILES WIDTH - 1
DOUBLE BUFFER ON
BEGIN GAMELOOP
ON SCROLL DOWN ROW CALL refreshRow
SCROLL DOWN
SELECT CASE JOY(0)
CASE JOY LEFT
IF playerX > 0 THEN
DEC playerX
ENDIF
CASE JOY RIGHT
IF playerX < (SCREEN WIDTH - SPRITE WIDTH) THEN
INC playerX
ENDIF
ENDSELECT
SPRITE player AT playerX, playerY ENABLE
IF (RANDOM BYTE > 128) THEN
RESPAWN objectThread(0)
ENDIF
IF (RANDOM BYTE > 146) THEN
RESPAWN objectThread(1)
ENDIF
IF (RANDOM BYTE > 192) THEN
RESPAWN objectThread(2)
ENDIF
IF (RANDOM BYTE > 192) THEN
RESPAWN objectThread(3)
ENDIF
END GAMELOOP
SOURCE FILE
HOW TO COMPILE AND RUN
The instructions here refer to compiling the example from the command line. For Microsoft Windows users we suggest using UGBASIC-IDE, which allows you to compile the example with just one click.
ATARI 400/800 family
In order to compile and run the example, you need to have the Altirra emulator, and in particular that the altirra executable is accessible.
Then, type this command on the command line:
# Linux ugbc.atari scrolling_example_08.bas -o example.xex altirra example.xex # Windows ugbc.atari.exe scrolling_example_08.bas -o example.xex altirra example.xex
ATARI 600XL/800XL/1200XL/XG(SE) family
In order to compile and run the example, you need to have the Altirra emulator, and in particular that the altirra executable is accessible.
Then, type this command on the command line:
# Linux ugbc.atarixl scrolling_example_08.bas -o example.xex altirra example.xex # Windows ugbc.atarixl.exe scrolling_example_08.bas -o example.xex altirra example.xex
Commodore 64
In order to compile and run the example, you need to have the VICE emulator, and in particular that the x64sc executable is accessible.
Then, type this command on the command line:
# Linux ugbc.c64 scrolling_example_08.bas -o example.prg x64sc example.prg # Windows ugbc.c64.exe scrolling_example_08.bas -o example.prg x64sc example.prg
Commodore PLUS/4
Using YAPE
In order to run the example, you need to have the YAPE emulator. In particular that the yape executable is accessible.
Then, type this command on the command line:
# Linux ugbc.plus4 scrolling_example_08.bas -o example.prg yape example.prg # Windows ugbc.plus4.exe scrolling_example_08.bas -o example.prg yape example.prg
Using VICE
In order to run the example, you need to have the VICE emulator. In particular that the xplus4 executable is accessible.
Then, type this command on the command line:
# Linux ugbc.plus4 scrolling_example_08.bas -o example.prg xplus4 example.prg # Windows ugbc.plus4.exe scrolling_example_08.bas -o example.prg xplus4 example.prg
Dragon 32
In order to compile and run the example, you need to have the XROAR emulator, and in particular that the xroar executable is accessible.
Then, type this command on the command line:
# Linux ugbc.d32 scrolling_example_08.bas -o example.bin xroar -rompath (your rom path) example.bin # Windows ugbc.d32.exe scrolling_example_08.bas -o example.bin xroar.exe -rompath (your rom path) example.bin
Dragon 64
In order to compile and run the example, you need to have the XROAR emulator, and in particular that the xroar executable is accessible.
Then, type this command on the command line:
# Linux ugbc.d64 scrolling_example_08.bas -o example.bin xroar -rompath (your rom path) example.bin # Windows ugbc.d64.exe scrolling_example_08.bas -o example.bin xroar.exe -rompath (your rom path) example.bin
PC128 Olivetti Prodest
In order to compile and run the example, you need to have the DCMOTO emulator, and in particular that the dcmoto executable is accessible.
Then, type this command on the command line and on the emulator:
# Linux ugbc.pc128op scrolling_example_08.bas -o example.k7 dcmoto (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC # Windows ugbc.pc128op.exe scrolling_example_08.bas -o example.k7 dcmoto (choose example.k7) (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
Thomson MO5
In order to compile and run the example, you need to have the DCMOTO emulator, and in particular that the dcmoto executable is accessible.
Then, type this command on the command line and on the emulator:
# Linux ugbc.pc128op scrolling_example_08.bas -o example.k7 dcmoto (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC # Windows ugbc.pc128op.exe scrolling_example_08.bas -o example.k7 dcmoto (choose example.k7) (choose BASIC 128) CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
Commodore VIC-20
In order to compile and run the example, you need to have the VICE emulator, and in particular that the xvic executable is accessible.
Then, type this command on the command line:
# Linux ugbc.vic20 scrolling_example_08.bas -o example.prg xvic --memory 24k example.prg # Windows ugbc.vic20.exe scrolling_example_08.bas -o example.prg xvic --memory 24k example.prg
ZX Spectrum
In order to compile and run the example, you need to have the Speccy emulator, and in particular that the speccy executable is accessible.
Then, type this command on the command line:
# Linux ugbc.zx scrolling_example_08.bas -o example.tap Speccy example.tap # Windows ugbc.zx.exe scrolling_example_08.bas -o example.tap Speccy example.tap
MSX
In order to compile and run the example, you need to have the openMsx or the BlueMSX emulator, and in particular that its executable is accessible.
Then, type this command on the command line:
openMSX
# Linux ugbc.msx1 scrolling_example_08.bas -o example.rom openmsx -cart example.rom # Windows ugbc.msx1.exe scrolling_example_08.bas -o example.rom openmsx -cart example.rom
blueMSX
# Linux ugbc.msx1 scrolling_example_08.bas -o example.rom bluemsx example.rom # Windows ugbc.msx1.exe scrolling_example_08.bas -o example.rom bluemsx example.rom
ColecoVision
In order to compile and run the example, you need to have the openMsx or the BlueMSX emulator, and in particular that its executable is accessible.
Then, type this command on the command line:
openMSX
# Linux ugbc.coleco scrolling_example_08.bas -o example.rom openmsx -machine \"COL - ColecoVision\" -cart example.rom # Windows ugbc.coleco.exe scrolling_example_08.bas -o example.rom bluemsx -machine \"COL - ColecoVision\" example.rom
blueMSX
# Linux ugbc.coleco scrolling_example_08.bas -o example.rom bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom # Windows ugbc.coleco.exe scrolling_example_08.bas -o example.rom bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
SEGA SC-3000
In order to compile and run the example, you need to have the BlueMSX emulator, and in particular that its executable is accessible.
Then, type this command on the command line:
# Linux ugbc.sc3000 scrolling_example_08.bas -o example.rom bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom # Windows ugbc.sc3000.exe scrolling_example_08.bas -o example.rom bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
SEGA SG-1000
In order to compile and run the example, you need to have the BlueMSX emulator, and in particular that its executable is accessible.
Then, type this command on the command line:
# Linux ugbc.sg1000 scrolling_example_08.bas -o example.rom bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom # Windows ugbc.sg1000.exe scrolling_example_08.bas -o example.rom bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
ANY PROBLEM?
If you have found a problem trying to run this example, if you think there is a bug or, more simply, you would like it to be improved, open an issue for this example on GitHub. Thank you!
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