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 BITMAP ENABLE(16)
 
 POSITIVE CONST startX = 1
 POSITIVE CONST startY = 1
 POSITIVE CONST wagonSpeed = 4
 POSITIVE CONST wagonSpeedX = ( wagonSpeed * SCREEN SPRITE RATIO X ) / 100
 POSITIVE CONST wagonSpeedY = ( wagonSpeed * SCREEN SPRITE RATIO Y ) / 100
 
 wagonImage := LOAD IMAGE( "/usr/src/mine-rails/resources/wagon.png")
 
 POSITIVE CONST wagonImageWidth = IMAGE WIDTH( wagonImage )
 POSITIVE CONST wagonImageHeight = IMAGE HEIGHT( wagonImage )
 
 POSITIVE CONST minWagonX = SCREEN BORDER X
 POSITIVE CONST minWagonY = SCREEN BORDER Y
 POSITIVE CONST screenWidthInWagonCoords = ( SCREEN WIDTH * SCREEN SPRITE RATIO X ) / 100
 POSITIVE CONST screenHeightInWagonCoords = ( SCREEN HEIGHT * SCREEN SPRITE RATIO Y ) / 100
 POSITIVE CONST maxWagonX = SCREEN BORDER X + screenWidthInWagonCoords - wagonImageWidth
 POSITIVE CONST maxWagonY = SCREEN BORDER Y + screenHeightInWagonCoords - wagonImageHeight
 
 DIM x AS POSITION = minWagonX
 DIM y AS POSITION = minWagonY
 DIM px AS POSITION = -1
 DIM py AS POSITION = -1
 DIM dx AS POSITION = 0
 DIM dy AS POSITION = 0
 
 wagon = CSPRITE( wagonImage )
 
 PROCEDURE prepareBitmaps ON CPC, ATARI, ATARIXL, C128Z, COCO, DRAGON, MO5, PC128OP, ZX
 
 	SHARED wagonImage
 	SHARED wagonBackground
 	
 	wagonBackground := NEW IMAGE( wagonImageWidth, wagonImageHeight )
 	PUT IMAGE wagonImage AT 0, 0
 	GET IMAGE wagonBackground FROM 0, 0
 	CLS BLACK
 	
 END PROC
 
 PROCEDURE readWagonMovement
 
 	SHARED x, y, dx, dy
 
 	right = JRIGHT(0) OR KEY PRESSED( KEY S )
 	left = JLEFT(0) OR KEY PRESSED( KEY A )
 	up = JUP(0) OR KEY PRESSED( KEY W )
 	down = JDOWN(0) OR KEY PRESSED( KEY Z )
 
 	IF (dx = 0) AND (dy = 0) THEN
 		IF right AND ( x < maxWagonX ) THEN
 			dx = wagonSpeedX
 		ELSE IF left AND ( x > minWagonX ) THEN
 			dx = -wagonSpeedX
 		ELSE IF down AND ( y < maxWagonY ) THEN
 			dy = wagonSpeedY
 		ELSE IF up AND ( y > minWagonY ) THEN
 			dy = -wagonSpeedY
 		ENDIF
 	ENDIF
 				
 END PROC
 
 PROCEDURE drawWagonSprite ON C64, C128, COLECO, MSX, SC3000, SG1000
 	
 	SHARED x, y
 	SHARED wagon
 
 	SPRITE wagon ENABLE AT x, y
 	
 END PROC
 
 PROCEDURE drawWagonBitmap ON CPC, ATARI, ATARIXL, C128Z, COCO, DRAGON, MO5, PC128OP, ZX
 	
 	SHARED x, y
 	SHARED px, py
 	SHARED wagonImage
 	
 	IF ( px <> x ) OR ( py <> y ) THEN
 		IF (px<>-1) AND (py<>-1) THEN
 			PUT IMAGE wagonBackground AT px, py
 		ENDIF
 		GET IMAGE wagonBackground FROM x, y
 		PUT IMAGE wagonImage AT x,y WITH TRANSPARENCY
 		px = x
 		py = y
 	ENDIF		
 
 END PROC
 
 DIM k AS BYTE
 
 PROCEDURE drawWagon
 	
 	SHARED x, y, dx, dy
 	SHARED wagon
 	SHARED k
 	
 	ADD x, dx
 	IF x < minWagonX THEN
 		x = minWagonX
 	ENDIF
 	IF x > maxWagonX THEN
 		x = maxWagonX
 	ENDIF
 	
 	ADD y, dy
 	IF y < minWagonY THEN
 		y = minWagonY
 	ENDIF
 	IF y > maxWagonY THEN
 		y = maxWagonY
 	ENDIF
 	
 	drawWagonSprite[] ON C64, C128, COLECO, MSX, SC3000, SG1000
 	drawWagonBitmap[] ON CPC, ATARI, ATARIXL, C128Z, COCO, DRAGON, MO5, PC128OP, ZX
 	
 	dx = 0
 	dy = 0
 	
 END PROC
 
 PROCEDURE drawWagonTimed ON C128Z
 
 	DIM t AS WORD
 	
 	IF ( TIMER - t ) > 5 THEN
 		drawWagon[]
 		t = TIMER
 	ENDIF
 
 END PROC
 
 prepareBitmaps[] ON CPC, ATARI, ATARIXL, C128Z, COCO, DRAGON, MO5, PC128OP, ZX
 
 EVERY 5 TICKS CALL drawWagon ON C64, C128, CPC, ATARI, ATARIXL, COCO, COLECO, DRAGON, MO5, MSX, PC128OP, SC3000, SG1000, ZX
 
 CLS
 
 EVERY ON
 
 DO
 	
 	readWagonMovement[]
 	
 	drawWagonTimed[] ON C128Z
 		
 LOOP
 
 
 

• main_014.bas

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.

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 main_014.bas -o example.xex
 altirra example.xex
 
 # Windows 
 ugbc.atari.exe main_014.bas -o example.xex
 altirra example.xex

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 main_014.bas -o example.xex
 altirra example.xex
 
 # Windows 
 ugbc.atarixl.exe main_014.bas -o example.xex
 altirra example.xex

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 main_014.bas -o example.prg
 x64sc example.prg
 
 # Windows 
 ugbc.c64.exe main_014.bas -o example.prg
 x64sc example.prg

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 main_014.bas -o example.prg
 yape example.prg
 
 # Windows 
 ugbc.plus4.exe main_014.bas -o example.prg
 yape example.prg

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 main_014.bas -o example.prg
 xplus4 example.prg
 
 # Windows 
 ugbc.plus4.exe main_014.bas -o example.prg
 xplus4 example.prg

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 main_014.bas -o example.bin
 xroar -rompath (your rom path) example.bin
 
 # Windows 
 ugbc.d32.exe main_014.bas -o example.bin
 xroar.exe -rompath (your rom path) example.bin

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 main_014.bas -o example.bin
 xroar -rompath (your rom path) example.bin
 
 # Windows 
 ugbc.d64.exe main_014.bas -o example.bin
 xroar.exe -rompath (your rom path) example.bin

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 main_014.bas -o example.k7
 dcmoto
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
 
 # Windows 
 ugbc.pc128op.exe main_014.bas -o example.k7
 dcmoto
 (choose example.k7)
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC

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 main_014.bas -o example.k7
 dcmoto
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC
 
 # Windows 
 ugbc.pc128op.exe main_014.bas -o example.k7
 dcmoto
 (choose example.k7)
 (choose BASIC 128)
 CLEAR,&H2FFF: LOADM"CASS:",R: EXEC

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 main_014.bas -o example.prg
 xvic --memory 24k example.prg
 
 # Windows 
 ugbc.vic20.exe main_014.bas -o example.prg
 xvic --memory 24k example.prg

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 main_014.bas -o example.tap
 Speccy example.tap
 
 # Windows 
 ugbc.zx.exe main_014.bas -o example.tap
 Speccy example.tap

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:

 # Linux 
 ugbc.msx1 main_014.bas -o example.rom
 openmsx -cart example.rom
 
 # Windows 
 ugbc.msx1.exe main_014.bas -o example.rom
 openmsx -cart example.rom

 # Linux 
 ugbc.msx1 main_014.bas -o example.rom
 bluemsx example.rom
 
 # Windows 
 ugbc.msx1.exe main_014.bas -o example.rom
 bluemsx example.rom

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:

 # Linux 
 ugbc.coleco main_014.bas -o example.rom
 openmsx -machine \"COL - ColecoVision\" -cart example.rom
 
 # Windows 
 ugbc.coleco.exe main_014.bas -o example.rom
 bluemsx -machine \"COL - ColecoVision\" example.rom

 # Linux 
 ugbc.coleco main_014.bas -o example.rom
 bluemsx /machine \"COL - ColecoVision\" /rom1 example.rom
 
 # Windows 
 ugbc.coleco.exe main_014.bas -o example.rom
 bluemsx  /machine \"COL - ColecoVision\" /rom1 example.rom

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 main_014.bas -o example.rom
 bluemsx /machine \"SEGA - SC-3000\" /rom1 example.rom
 
 # Windows 
 ugbc.sc3000.exe main_014.bas -o example.rom
 bluemsx  /machine \"SEGA - SC-3000\" /rom1 example.rom

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 main_014.bas -o example.rom
 bluemsx /machine \"SEGA - SG-1000\" /rom1 example.rom
 
 # Windows 
 ugbc.sg1000.exe main_014.bas -o example.rom
 bluemsx  /machine \"SEGA - SG-1000\" /rom1 example.rom

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!