{{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 ====
   DEFINE STRING SPACE 128
   DEFINE STRING COUNT 32
   DEFINE SCREEN MODE UNIQUE
   
   BITMAP ENABLE(16)
   
   CONST step = 2
   CONST levels = SCREEN HEIGHT / 16
   CONST screenLimitH = ( SCREEN HEIGHT - 1 )
   CONST screenLimitH2 = screenLimitH - 16
   CONST screenLimitW = ( SCREEN WIDTH - 1 )
   CONST screenLimitBH = ( SCREEN HEIGHT - 12 )
   CONST screenLimitBW = ( SCREEN WIDTH - 8 )
   CONST screenLimitBWB = ( SCREEN WIDTH - 16 )
   CONST screenLimitL = 2*step
   CONST maxDistancePerPath = 300
   CONST startPosX = ( SCREEN WIDTH / 2 ) - 4
   CONST maxBallPerGame = 10
   CONST centerScreenY = SCREEN ROWS / 2
   CONST currentBallsX = SCREEN COLUMNS - 10
   
   DIM x%, y%, px%, py%, dx%, dy%, d@, m@, v@, currentballs@, oldballs@, winColor@
   DIM score%, oldscore%,distance%, bx%, by%
   
   GLOBAL x, y, px, py, f, dx, dy, d, m, v, score, oldscore, currentballs, oldballs, distance
   GLOBAL winColor, blockColor
   GLOBAL bx, by
   
   GLOBAL ball, bar, bgball
   GLOBAL basket
   
   PROCEDURE home1
   	LOCATE , 1
   END PROCEDURE
   
   PROCEDURE clrline1
   	WAIT 1000 MS
   	LOCATE ,1: CENTER "              "
   END PROCEDURE
   
   PROCEDURE center
   	LOCATE , centerScreenY
   END PROCEDURE
   
   PROCEDURE titleScreen
   
   	CLS
   	LOCATE , centerScreenY
   	INK BLUE
   	CENTER "{BLUE}10 BALLS DOWN!"
   	CENTER "{GREY}(press fire)"
   	PRINT
   	CENTER "{RED}last score: "+STR(score)
   	WAIT KEY OR FIRE RELEASE
   	
   END PROCEDURE
   
   PROCEDURE prepareGraphics
   
   	bgball := NEW IMAGE(16,10)
   	
   	CLS BLACK
   	INK GREY
   	BAR 0,0 TO 15,3
   	INK BLUE
   	DRAW"L16R2U3L2R16L2D3L4U3L3D3"
   	bar := NEW IMAGE(16,4)
   	GET IMAGE bar FROM 0, 0
   
   	CLS 
   	INK GREY
   	BAR 0,0 TO 15,7
   	INK BLUE
   	DRAW"BU8D8L15U8"
   	basket := NEW IMAGE(16,8)
   	GET IMAGE basket FROM 0, 0
   	
   	winColor = POINT(3,1)
   	
   	CLS
   	INK RED
   	CIRCLE 4,4,4
   	PAINT(4,4)
   	INK WHITE
   	DRAW"BU2L1D1L1D1"
   	ball := NEW IMAGE(16,10)
   	GET IMAGE ball FROM 0, 0
   	
   	CLS
   
   	GET IMAGE bgball FROM 0, 0
   	
   END PROCEDURE
   
   PROCEDURE drawBarrier
   	bx = 0
   	j = RND(255): i = j: c = 0
   	REPEAT
   		IF (j AND 1) = 1 THEN
   			PUT IMAGE bar AT bx, by
   			INC c
   		ENDIF
   		j = j \ 2
   		IF ( j = 0 AND c > 4 ) THEN
   			j = i AND 127
   		ENDIF
   		ADD bx, 16
   	UNTIL bx > screenLimitBW
   END PROCEDURE
   
   PROCEDURE drawBarriersAndBaskets
   	CLS
   	RANDOMIZE TIMER
   	by = 24
   	REPEAT
   		drawBarrier[]
   		ADD by, 16
   	UNTIL by > screenLimitH2
   	bx = 8
   	REPEAT
   		PUT IMAGE basket AT bx, by
   		ADD bx, RND(16)
   		ADD bx, 20
   	UNTIL bx > screenLimitBWB
   	INK BLUE
   	DRAW 0,16 TO 0,screenLimitH
   	DRAW 0,screenLimitH TO screenLimitW,screenLimitH
   	DRAW screenLimitW,16 TO screenLimitW,screenLimitH
   END PROCEDURE
   
   PARALLEL PROCEDURE moveBall
   	REPEAT
   		WAIT WHILE d
   		IF dy OR dx THEN
   			x3 = x-3: x4 = x+4: y9 = y+9
   			x9 = x+9: y4 = y+4
   			IF POINT(x4,y9) = BLACK THEN
   				dy = 1
   				dx = 0
   			ELSE
   				dy = 0
   				IF dx = 0 AND y < screenLimitBH THEN
   					IF RND(100) > 50 THEN
   						dx = step
   					ELSE
   						dx = -step
   					ENDIF
   				ENDIF
   				IF POINT(x4,y9) = winColor THEN
   					home1[]
   					IF distance < maxDistancePerPath THEN
   						ADD score, maxDistancePerPath - distance
   						CENTER "+"+STR(maxDistancePerPath - distance)+" points!"
   					ELSE
   						CENTER "no points!"
   					ENDIF
   					clrline1[]
   					dy = 0
   					dx = 0
   					y = 8
   					x = startPosX
   					DEC currentballs
   				ELSEIF y > screenLimitBH THEN
   					home1[]
   					CENTER "missed!"
   					clrline1[]
   					dy = 0
   					dx = 0
   					y = 8
   					x = startPosX
   					DEC currentballs
   				ELSEIF x >= screenLimitBW AND dx > 0 THEN
   					dx = -step
   				ELSEIF x < step AND dx < 0 THEN
   					dx = step
   				ELSEIF POINT(x9,y4) <> BLACK THEN
   					dx = -step
   				ELSEIF POINT(x3,y4) <> BLACK THEN
   					dx = step
   				ENDIF
   			ENDIF
   			ADD x, dx
   			ADD y, dy
    			INC distance
   		ENDIF
   		m = 1
   		d = 1
   	UNTIL y > SCREEN HEIGHT	
   END PROCEDURE
   
   PROCEDURE waitRaster
   	WAIT WHILE m
   	FORBID
   	WHILE RASTER LINE < y+16
   	WEND
   	ALLOW
   END PROC
   
   PARALLEL PROCEDURE drawBalls
   
   	DO
   		waitRaster[]
   		d = 1
   		IF px <> x OR py <> y THEN
   			PUT IMAGE bgball FRAME i AT px, py
   			GET IMAGE bgball FRAME i FROM x, y
   			PUT IMAGE ball AT x, y WITH TRANSPARENCY
   			px = x
   			py = y
   		ENDIF
   		d = 0
   	LOOP
   	
   END PROCEDURE
   
   PARALLEL PROCEDURE movePlayerAndDrawScore
   
   	DO
   		INK GREY
   		IF oldscore <> score THEN
   			HOME
   			PRINT score
   			oldscore = score
   		ENDIF
   		IF oldballs <> currentballs THEN
   			LOCATE currentBallsX, 0: PRINT "BALLS: "; currentballs;" "
   			oldballs = currentballs
   		ENDIF
   		IF y = 8 THEN
   			IF ( JLEFT(0) OR KEY PRESSED(KEY A) ) AND x > screenLimitL THEN
   				ADD x, -step
   			ENDIF
   			IF ( JRIGHT(0) OR KEY PRESSED(KEY D) ) AND x < screenLimitBW THEN
   				ADD x, step
   			ENDIF
   			IF JFIRE(0) OR KEY PRESSED(KEY SPACE) THEN
   				dy = 1
   				INC y
   				distance = 0
   			ENDIF
   		ENDIF
   	LOOP
   		
   END PROC
   
   prepareGraphics[]
   
   DO
   
   	titleScreen[]
   	
   	currentballs = maxBallPerGame
   	oldscore = -1
   	score = 0
   	y = 8
   	x = startPosX
   	dx = 0
   	dy = 0
   	d = 1
   	m = 0
   	
   	drawBarriersAndBaskets[]
   		
   	tmb = SPAWN moveBall
   	tdb = SPAWN drawBalls
   	tmp = SPAWN movePlayerAndDrawScore
   
   	DO
   		EXIT IF currentballs = 0
   		RUN PARALLEL
   	LOOP
   
   	KILL tmb
   	KILL tdb
   	KILL tmp
   	
   	center[]
   	CENTER "{RED}score: "+STR(score)
   	PRINT
   	CENTER "(press fire)"
   	WAIT KEY OR FIRE RELEASE
   
   LOOP	
   	
   
   
   
   
   
   
   
   
   
   


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