{{htmlmetatags>metatag-robots=()
metatag-title=(SPRITE MANAGEMENT MOVING PARALLEL SPRITES IN GAMELOOP | 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=(SPRITE MANAGEMENT MOVING PARALLEL SPRITES IN GAMELOOP | ugBASIC User Manual) 
metatag-og:description=(An isomorphic language for retrocomputers)
}}

====== ugBASIC User Manual ======

===== SPRITE MANAGEMENT MOVING PARALLEL SPRITES IN GAMELOOP =====

==== PURPOSE ====
 This example shows how to move sprites by using the multitasking feature, assigning a movement routine to each sprite, and inside a game loop, to improve performances on VBL constaint systems.  

==== SOURCE CODE ====
   
   BITMAP ENABLE (2)
   
   CONST spriteCount = 8
   
   DEFINE TASK COUNT spriteCount
   
   DIM sprites AS SPRITE (spriteCount)
   DIM x AS POSITION (spriteCount)
   DIM y AS POSITION (spriteCount)
   
   spriteImage = LOAD IMAGE("drop.png")
   
   GLOBAL sprites,x,y,spriteImage
   
   drops = 0
   dropskip = (BYTE) ( SPRITE HEIGHT * 2 )
   
   FOR i=0 TO spriteCount-1
       sprites(i) = SPRITE(spriteImage)
   NEXT
   
   BEGIN GAMELOOP
   
       PARALLEL PROCEDURE dropDown
           SPRITE [sprites] ENABLE
           DO
               [x] = RANDOM WIDTH
               FOR [y] = 0 TO SCREEN HEIGHT + IMAGE HEIGHT(spriteImage)
                   SPRITE [sprites] AT [x], [y] COLOR BLUE
               NEXT
           LOOP
       END PROC    
   
       IF drops < (spriteCount-1) THEN
           DEC dropskip
           IF dropskip = 0 THEN
               SPAWN dropDown
               dropskip = SPRITE HEIGHT
               INC drops
           ENDIF
       ENDIF
   
   END GAMELOOP


==== SOURCE FILE ====
  * ''[[https://github.com/spotlessmind1975/ugbasic/tree/main/examples/sprites_example_03.bas|sprites_example_03.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 sprites_example_03.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atari.exe sprites_example_03.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 sprites_example_03.bas -o example.xex
   altirra example.xex
   
   # Windows 
   ugbc.atarixl.exe sprites_example_03.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 sprites_example_03.bas -o example.prg
   x64sc example.prg
   
   # Windows 
   ugbc.c64.exe sprites_example_03.bas -o example.prg
   x64sc example.prg
=== Commodore 64+REU ===
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.c64reu sprites_example_03.bas -o example.prg
   x64sc -reu example.prg
   
   # Windows 
   ugbc.c64reu.exe sprites_example_03.bas -o example.prg
   x64sc -reu 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 sprites_example_03.bas -o example.prg
   yape example.prg
   
   # Windows 
   ugbc.plus4.exe sprites_example_03.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 sprites_example_03.bas -o example.prg
   xplus4 example.prg
   
   # Windows 
   ugbc.plus4.exe sprites_example_03.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 sprites_example_03.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d32.exe sprites_example_03.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 sprites_example_03.bas -o example.bin
   xroar -rompath (your rom path) example.bin
   
   # Windows 
   ugbc.d64.exe sprites_example_03.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 sprites_example_03.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe sprites_example_03.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 sprites_example_03.bas -o example.k7
   dcmoto
   (choose BASIC 128)
   CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
   
   # Windows 
   ugbc.pc128op.exe sprites_example_03.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 sprites_example_03.bas -o example.prg
   xvic --memory 24k example.prg
   
   # Windows 
   ugbc.vic20.exe sprites_example_03.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 sprites_example_03.bas -o example.tap
   Speccy example.tap
   
   # Windows 
   ugbc.zx.exe sprites_example_03.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 sprites_example_03.bas -o example.rom
   openmsx -cart example.rom
   
   # Windows 
   ugbc.msx1.exe sprites_example_03.bas -o example.rom
   openmsx -cart example.rom
== blueMSX ==
   # Linux 
   ugbc.msx1 sprites_example_03.bas -o example.rom
   bluemsx example.rom
   
   # Windows 
   ugbc.msx1.exe sprites_example_03.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 sprites_example_03.bas -o example.rom
   openmsx -machine \"COL - ColecoVision\" -cart example.rom
   
   # Windows 
   ugbc.coleco.exe sprites_example_03.bas -o example.rom
   bluemsx -machine \"COL - ColecoVision\" example.rom
== blueMSX ==
   # Linux 
   ugbc.coleco sprites_example_03.bas -o example.rom
   bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
   
   # Windows 
   ugbc.coleco.exe sprites_example_03.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 sprites_example_03.bas -o example.rom
   bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
   
   # Windows 
   ugbc.sc3000.exe sprites_example_03.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 sprites_example_03.bas -o example.rom
   bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
   
   # Windows 
   ugbc.sg1000.exe sprites_example_03.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 SPRITE MANAGEMENT MOVING PARALLEL SPRITES IN GAMELOOP|open an issue]] for this example on GitHub. Thank you!===== POWERED BY =====

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