{{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 maxPlayers = 2
   
   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
   
   DIM player AS SPRITE(maxPlayers)
   player(0) = CSPRITE(LOAD IMAGE("examples/scrolling_player0.png"))
   player(1) = CSPRITE(LOAD IMAGE("examples/scrolling_player1.png"))
   
   arrow = SPRITE(LOAD IMAGE("examples/scrolling_arrow.png"))
   
   rowIndex = 0
   windowIndex = 0
   playerIndex = 0
   playerX = ( SCREEN WIDTH - SPRITE WIDTH ) \ #2
   arrowX = 0
   arrowY = 0
   
   GLOBAL wall
   GLOBAL window
   GLOBAL rowIndex
   GLOBAL windowIndex
   GLOBAL playerIndex
   GLOBAL playerX
   GLOBAL arrowX
   GLOBAL arrowY
   
   SCREEN ROWS 24
   
   SCROLL LEFT
   SCROLL LEFT
   SCROLL LEFT
   SCROLL LEFT
   
   DRAW TILES basement ROW 0, 0 TO SCREEN TILES WIDTH - 1
   
   DOUBLE BUFFER ON
   
   BEGIN GAMELOOP
   
       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
   
           SPRITE player(playerIndex) AT playerX, SCREEN HEIGHT - SPRITE HEIGHT - TILES HEIGHT(basement) ENABLE
           SPRITE player(1-playerIndex) DISABLE
           
           ADD rowIndex, 1, 0 TO 2
           ADD windowIndex, 1, 0 TO 7
           ADD playerIndex, 1, 0 TO 1
   
       END PROC
   
       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
   
       IF RND(100) > 50 THEN
           IF arrowY = 0 THEN
               arrowX = RND(SCREEN WIDTH - SPRITE WIDTH - 1)
               arrowY = 1
           ENDIF
       ENDIF
   
       IF arrowY > 0 THEN
           ADD arrowY, 3, 0 TO SCREEN HEIGHT + SPRITE HEIGHT
           SPRITE arrow AT arrowX, arrowY ENABLE
       ELSE
           SPRITE arrow DISABLE
       ENDIF
   
   END GAMELOOP
   


==== SOURCE FILE ====
  * ''[[https://github.com/spotlessmind1975/ugbasic/tree/main/examples/scrolling_example_04.bas|scrolling_example_04.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_04.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atari.exe scrolling_example_04.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_04.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atarixl.exe scrolling_example_04.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_04.bas -o example.prg
   x64sc example.prg
   
   # Windows 
   ugbc.c64.exe scrolling_example_04.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_04.bas -o example.prg
   yape example.prg
   
   # Windows 
   ugbc.plus4.exe scrolling_example_04.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_04.bas -o example.prg
   xplus4 example.prg
   
   # Windows 
   ugbc.plus4.exe scrolling_example_04.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_04.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d32.exe scrolling_example_04.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_04.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d64.exe scrolling_example_04.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_04.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe scrolling_example_04.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_04.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe scrolling_example_04.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_04.bas -o example.prg
   xvic --memory 24k example.prg
   
   # Windows 
   ugbc.vic20.exe scrolling_example_04.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_04.bas -o example.tap
   Speccy example.tap
   
   # Windows 
   ugbc.zx.exe scrolling_example_04.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_04.bas -o example.rom
   openmsx -cart example.rom
   
   # Windows 
   ugbc.msx1.exe scrolling_example_04.bas -o example.rom
   openmsx -cart example.rom
== blueMSX ==
   # Linux 
   ugbc.msx1 scrolling_example_04.bas -o example.rom
   bluemsx example.rom
   
   # Windows 
   ugbc.msx1.exe scrolling_example_04.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_04.bas -o example.rom
   openmsx -machine \"COL - ColecoVision\" -cart example.rom
   
   # Windows 
   ugbc.coleco.exe scrolling_example_04.bas -o example.rom
   bluemsx -machine \"COL - ColecoVision\" example.rom
== blueMSX ==
   # Linux 
   ugbc.coleco scrolling_example_04.bas -o example.rom
   bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
   
   # Windows 
   ugbc.coleco.exe scrolling_example_04.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_04.bas -o example.rom
   bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
   
   # Windows 
   ugbc.sc3000.exe scrolling_example_04.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_04.bas -o example.rom
   bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
   
   # Windows 
   ugbc.sg1000.exe scrolling_example_04.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 |}}]]