{{htmlmetatags>metatag-robots=()
metatag-title=(  | ugBASIC User Manual)
metatag-keywords=(ugBASIC,Commodore 64,Commodore PLUS/4,ZX Spectrum)
metatag-description=(An isomorphic language for retrocomputers)
metatag-media-og:image=(:ugbasic:logo-ugbasic-fb.png)
metatag-og:title=(  | ugBASIC User Manual) 
metatag-og:description=(An isomorphic language for retrocomputers)
}}

====== 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 ====
  * ''[[https://github.com/spotlessmind1975/ugbasic/tree/main/examples/scrolling_example_08.bas|scrolling_example_08.bas]]''
==== HOW TO COMPILE AND RUN ====
The instructions here refer to compiling the example from the command line. For Microsoft Windows users we suggest using **[[https://spotlessmind1975.itch.io/ugbasic-ide|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, [[https://github.com/spotlessmind1975/ugbasic/issues/new?title=IMPROVE  |open an issue]] for this example on GitHub. Thank you!===== POWERED BY =====

[[:ugbasic:user:examples|{{ :ugbasic:user:logo-ugbasic.png?nolink&600 |}}]]