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display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... slowly. The explanation of the screen addressing comes from [URL="http ... 2010/10/02/zx-spectrum-screen-memory/"]http://flockofspectrums.wordpress.com ... RETURN
1100 REM Plot x,y
1105 REM ref http ... /2010/10/02/zx-spectrum-screen-memory/
1107 REM ... -
Help with calculating screen addresses[SIZE=3][FONT=Calibri]I?m having a bit of a coding session whilst at work so can?t spend too much time on my current problem. I?m sure someone on thi…
... /> 335 // pxy = pixel (x,y) coordinate
336 //
... 339 // cyx = character (y,x) coordinate - ordering borrowed from ... character y coordinate corresponding to the given screen address ... corresponding to the given (x,y) pixel coordinate
... -
Type-in BASIC contest on Reddit.Not sure how WOS-legal it is to mention/link to other forums, but Reddit is having a contest on r/retrobattlestations, asking readers to type a speci…
... addressing the data to the screen is very inefficient.
... ----
200 REM Clear screen and setup variables
... REM Columns and Rows of screen
300 REM Load ... background and draw on screen
310 GO ... /> 680 LET x=x+x(i)+kf: LET y=y+y(i): LET p ... -
Documentation of ZX Spectrum built-in functionsHi, Is there a documentation of the built-in ZX Spectrum 48+ functions (assembly)? I am thinking about something like the documentation included in …
... Byte on the screen (8 pixels), at the (X,Y) coordinates, but that ... -
Documentation of ZX Spectrum built-in functionsHi, Is there a documentation of the built-in ZX Spectrum 48+ functions (assembly)? I am thinking about something like the documentation included in …
... Byte on the screen (8 pixels), at the (X,Y) coordinates, but that ... ]
Look in the SCREEN section. You'll see that ... -
Rendering clipped glyphSometimes you need to render a glyph of arbitrary size to the screen. And clip it. For example: drawing a mouse cursor means combining drawing of a…
... sprites travelling all over screen and therefore periodically disappearing ... clipped against the full size screen, example here:
< ... frame = animation frame offset
x,y = pixel coordinate
[/code ... the engine divides the screen into characters, so ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... d ; point to next screen location
inc l ... /> dec de ; adjust screen pointer
djnz pos_2a ... /> dec de ; adjust screen pointer
djnz pos_5a ... fdel ; x, y, z * sin(pi/A)
fsub ; x, y - z ... -
Pseudo-3D map renderingHave been mulling this over for a while, until that isometric thread prompted me to ask. I'm not sure if this is officially classed as 2D, 2.5D, or 3…
... /screen like the above mock-up...?[/QUOTE]
Perhaps having x, y ... the z-order is max y of your sprite and goes ... -
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... list of data pointers and X/Y character co-ordinates.[/QUOTE]
screen, we would need to store ... -
Pseudo-3D map renderingHave been mulling this over for a while, until that isometric thread prompted me to ask. I'm not sure if this is officially classed as 2D, 2.5D, or 3…
... if it is not full screen). I did that with my ... from the attributes (2/3 screen only so I had 512 ... T, N tiles long from x,y so each level didn't ... -
Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …
... ,2) for 22.5? angle, x/y axes 45/75
ld ... )
inc hl ;B,C=y,x
push hl
ld ...
call $22aa ;PIXEL_ADD ;get x,y screen address
ld b,a ... -
Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …
... would take 12.5kb if x,y were merged into one number ... I could directly address the screen bytes without having to calculate ... -
Land of Mire Mare[Quote]This game has to be considered as a tribute. It's inspired by the unreleased Mire Mare game & characters created by Ultimate Play The Game in …
... more than something that was y'know...good), so I don ... time I died on a screen that was split in ... the wrong part of the screen, so I had to ... in retrospect using the last x,y position to respawn may have ... I get a mostly empty screen, with just one (sometimes ... -
Land of Mire Mare[Quote]This game has to be considered as a tribute. It's inspired by the unreleased Mire Mare game & characters created by Ultimate Play The Game in …
... sprite starting points on each screen in AGD it may not ... Luca to use the last x,y - as i say first game ... -
How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... at 23695 on the screen? If so how would ... 40 LET p=POINT (x,y): LET c$(x+1)=CHR$ 143 ... -y,x+1) THEN PLOT x,y: PRINT x;",";y;" ";
80 NEXT x: NEXT y< ... any size anywhere on the screen.
I' ... an enlarging character across the screen. It's a bit ... -
How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... are fairly straightforward; the x,y coords locate the bottom ... first character. The full screen is addressed, so 0 ... the x,y dimensions of the characters; an x,y scale ... fit (one character) on the screen.
The ... to fit on the screen then they will be ... -
The official CSSCGC 2014 threadJust to announce that the comp.sys.sinclair Crap Games Competition 2014 is now open. It's home for the year will be; [url]http://www.mykeweb.co.uk/c…
... my understanding is that x = horizontal and y = vertical, however, the Speccy ... as 'PRINT AT y,x.' RTL uses 'PRINT AT x,y' or 'down then ... as much as PRINT AT y,x would've messed with [I ... ] left-hand side of the screen if the Speccy used Cartesian ... -
Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…
... /> {
xtemp = x*x - y*y + x0
y = 2*x*y + y0
x = xtemp
iteration ... to just display the background screen.
An instruction has been ... spectrum display to the background screen everytime the program counter reaches ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... , x refers to the VERTICAL distance from the top of the screen ... and y to the HORIZONTAL distance ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... a screen address and have it give me back the x and y ... br />
Screen address to pixel x and pixel y coordinate is in ... asm[/URL] (screen address to pixel y)
The screen address does ... an x coord / y coord into the right positions in the screen or ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... ....for a given screen pixel coord of x,y, where y=0 zero is ... the top of the screen, the ... = bit 0 of x, y4 = bit 4 of y etc.
screen address...it was a pile ... -
Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... flat screen to speccy screen..
;
; NOTE: this will convert (x,y) 0 ... , 0..191 to the correct address for the spectrum screen ... ,0 ; first clear the x,y coords (b=y, c=x)
ld hl ... -
X*Y*Z - A community project?Five years ago I wrote a game called [B]W*H*B[/B] ([URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0023478"]http://www.worldofspectrum.org/inf…
... from what works well on-screen, such as the blocks being ... such that will continue with X*Y*Z. -
X*Y*Z - A community project?Five years ago I wrote a game called [B]W*H*B[/B] ([URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0023478"]http://www.worldofspectrum.org/inf…
... the tiles could fit on-screen without scrolling.
If ... wouldn't all fit on screen, and shrinking them so they ... well.
As for X*Y*Z, it is likely to ... again is the case with X*Y*Z. Although the 'player' is ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... a modern mouse generates more x,y change in shorter movements. ... like crazy all over the screen (and this is why ... the mouse pointer to the screen boundary without wrapping (usually), ... deltas to an internally maintained x,y state. This is actually harder ... -
Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …
... poking the attributes of the screen is actually pretty slow! I ... /c and just poke the x,y,attrvalue into it before USR ... -
Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …
... ;TAB 31: NEXT y
10 LET X=10: LET Y=10: DIM ... i$(1): LET w=x: LET z=y ... c$=" ": PRINT AT x,y;a$: PRINT AT x+1,y;b$
45 ... LET w=X: LET z=Y: LET ... i$=INKEY$:
LET x=x+((28 AND x=1)-(x ... -
SpecBAS / SpecOS documentationHi, I just find out about SpecBAS and I was so impressed by the new functions while retaining compatibility with ZX Basic that I've been playing wit…
... it 0,0 on the screen (the top left corner ... an absolute location (the x,y of the screen)
SPRITE MOVE ... 400,400 sets an absolute screen destination
so if ... = 400,400 on the screen
if the sprite ... the bottom of the screen because option 2 moves ... -
Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... a filled rectangle on the screen. Whilst reading the "Step ... I came across the partical screen clear routine.
... [CODE]1 DEF FN a(x,y,h,v)=USR 63000
x: NEXT y
20 GO SUB ... be able to supply the x,y,h,v and attribute value ... -
Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... /> LET i=FN a(x,y,h,v,a)
... pretty. The "out of screen" check is wrong, by ... P ;quit if out of screen
LD (a63092),DE ... hl,bc ;HL=22528 + 32*y + x
push hl
... presto! HL=display address for x,y
LD A,(a63094 ...
