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Flood Fill IssueHi Folks, Came across the following Flood Fill routine by John Metcalf: [code]; scanline fill by John Metcalf ; call with d=x-coord, e=y-coo…
...
; call with d=x-coord, e=y-coord
; ... E5
; calculate bit position of pixel
nextrun:
pixel or the screen edge,< ... C9
; calculate the pixel address and whether or not ... -
RAD for SpeccyJust wanted to share a fine technique of rapid app development for ZX Spectrum in C. Programming without debugger is a pain. It comes down to needing…
... and atom functions to calculate position on screen and read/ ... new rect();
bmp_rect.x = x; bmp_rect.y = y; bmp_rect.w = w; bmp_rect ... able to pick them all from stack.
// ... ==0?0:1); // OPTIMIZE: From stack.
int skip = ... -
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... br /> ;
; Draw a pixel line from (x0,y0) defined (H,L ... (x,y) coordinate.
;
; in: bc = (y,x) coordinate of pixel < ... bit number is 0 of pixel position
;
; ... -
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... />
LD A,C ;taking pixel position
ADD A,A
INC H ;backwards from right-to-left. The reason ... to draw sprite in unshifted position
RET ;not implemented ... DEFB 1 ;X Coord
SPRYCO DEFB 1 ;Y Coord
... -
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
...
Timing for 32 x 32 masked sprite: 16084 tstates ... * Draw sprite in unshifted position. Called when pixel position is zero.
SPRITE LD A,(SPRYCO) ;calculate screen address using a table ... .
* each byte from 0-255 is stored shifted ... -
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
...
; based as opposed to pixel based system
; ...
; WriteSpriteChar
; Calculate address of char
; 0 = X Position (0-31)
; 1 = Y Position (0-23)
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... add offset based on pixel position of ycar
... LD A,(YOFFSET) ; Get Y Offset
LD E, ... SUB E ; take it from 8
RLA ; double ... />
WRITECHAR:
; C = X, L = B, DE = GFX
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... add offset based on pixel position of ycar
... LD A,(YOFFSET) ; Get Y Offset
LD E, ... SUB E ; take it from 8
RLA ; double ... />
WRITECHAR:
; C = X, L = B, DE = GFX
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... add offset based on pixel position of ycar
... LD A,(YOFFSET) ; Get Y Offset
LD E, ... SUB E ; take it from 8
RLA ; double ... />
WRITECHAR:
; C = X, L = B, DE = GFX
Basic info about platformers...I have run a search for an answer to this question and haven't found quite what I was looking for so I thought I would pop a post on here... What ar…
... struct Sprite {
int x, y; //current position of the sprite
RECT ... just derive different character sprites from the Sprite struct (you ... />
You could use pixel overlap tests to actually fine ... , and then do a pixel overlap test (if you ...ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…
... to an entire vertical pixel screen line at a ... br /> [code]
;Z GBLT x y w h x2 y2 -- blt ... hl) ; get vertical line from source
ld b, ... out (yport),a ; reset dest Y position
exx
ld ...Getting attribute location from a screen coordinates (x,y)I am having trouble figuring out how to convert an x,y coordinate pair (pointing to a specific pixel) to the location of the attribute for the block …
... 7) indicates the vertical pixel row within a character ... />
X : CCCC CTTT (0-255)
Y : BBLL LSSS ... indicates the pixel position within a byte. 0=leftmost pixel position (bit ... , you want to go from #1 to #4. ... do. Never mind, going from #2 to #4 shouldn ...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... an absolute pixel position. Both the X and Y pixel coordinates can range from 0-2047 ... an absolute position but this time separates character coordinates and pixel shift ... are the pixel shift within a character and range from 0-7 ...Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... ;
; pixel position ;
; ... b - y position in pixels ;
; c - x position in pixels ... Y routine for the hl screen address from ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... the screen rendering routine from the one all you ... this, when inceasing the y pixel position as in your subroutine, ... ;get next line draw position, return in de
ldi x 32
ex de, ... /> push de
ldi x 32
pop de
Collision detectionI understand the basic methods for testing for collisions but I have question about the trickier situation of testing for when shots hit the backgrou…
... try testing against the X/Y/Width/Height bounding boxes ... stored in memory rather than from the screen itself.
... that holds an active sprites X, Y position, Width, Height, NumFrames, ... (compare X/Y/Width/Hieght for overlap) before doing pixel collision
Collision Detection in SP1Hi, Does anyone have a well-documented example of using collision detection in spritelib. I've search WoS and Z88DK forums but no joy. Something wi…
... completely included all the sprite position information in their calculations. Again ... the sprite
The (x,y) pixel coordinates of the top left ... . xthresh and ythresh also come from the "struct sp1_ss"; they don ...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... ;320304]Thanks for the input from everybody - I am sure I ... can sort something from this lot! Great support!
LD HL,STARPOS_X ; store X position of star
ADD HL ... in a
AND %00000111 ; calculate y mod 8
ADD A ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... are taken
; from the standard screen channel. To ... ordiante use
; PRINT AT y,x; #4; "some text";. All ... br /> po_store equ 0x0adc ; position store routine
report_j ... ret nc ;
; calculate attribute addres from s_posn
ld a ...Sinclair Light Gun and modern tellies/monitorsDoes the Sinclair Light Gun work with modern LCD/TFT/plasma screens? I have my Speccy linked up by TV card to a PC outputting to a LCD monitor, and …
... game that wanted data from the lightgun would poll ... fullscreen) emulated display, then calculate the right fake timing compared ... point, estimate the response from the lightgun's light sensor ... in x/y coords, then just substitute the mouse pointer position in ...New member here. And a spider! :)Hello everyone. My name is Sekrets. I'm quite a lonely individual, searching for a digital home where I might find fellow speccy enthusiasts to adopt…
... load a 16-bit value from memory into BC using ... display file manipulator functions and from the name you will ... />
So for example, zx_pxy2aaddr (pixel x,y to attribute address) takes a ... your sprite on any vertical pixel position, not just those aligned to ...ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…
... that says 'the Square at position 12 across 3 down' contains ... an effect on any other pixel. Once something has appeared ... 3,12 into the appropriate pixel X, Y values for you and writes ... ld a,(de) ;get byte from ROM
ld (hl),a ...The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …
... The graphics are 8 x 8 pixel character based, 4 bits ... . Sprites are made from 8 x 8 pixel characters stored in VRAM ... playfields are generated from the 8 x 8 pixel characters stored in ... direction by setting the X/Y starting position of the playfield character ...GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
... current x position (0-255)
read port $ffdf for current y position ( ... .
Aside from the y range problem, the Kempston also ... you are at x position 255 and move right one pixel, the interface ... left edge of the screen from the right side while ...Wolfenstein / Doom for 48k SpectrumHi, is there any game / demo of this kind that runs on 48k machines? Thanks.
... you take the single pixel row from the floor where it ... you only have to calculate one pixel row of sprite mask, ... at different sizes in X-direction, and scale it ... in Y-direction.
What I ... always take alternate rows from each of the two sprites ...Simple SpriteHow do you draw a sprite on the screen? For example i want to draw a smiley face sprite and would like either a link to a tutorial or a very well com…
... listed can calculate a screen display position from the x y ('PRINT AT') position.
x y character positions (row/column).Simple SpriteHow do you draw a sprite on the screen? For example i want to draw a smiley face sprite and would like either a link to a tutorial or a very well com…
I would build up from the basics.
1) Learn ... (say) a 16x16 graphic at position (0,0) onto the screen ... work for any character position horizontally and any pixel position vertically. This involves ... converts an X (0..30) and Y (0..192-32) position to a ...Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... Placing sprites vertically at a pixel position is easy, which will be ... bit number CCCCC can range from 0-31 and represents ... can range from 0-7 and represents the horizontal pixel shift ... any pixel coordinate involves:
1- Given the x,y coordinate ...PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…
...
18 ; h = pix Y 0..191
; uses: af ... br /> X coordinate (pixel 0-255): CCCC CPPP
Y coordinate (pixel 0-191 ... is starting with the X and Y coordinates (8-bit bytes ... down, left or right from the current pixel position. This can be done ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... br /> (Also POKABLE x,y coordinates, but it's ... LD DE,(chans) ; Calculate the offset to the ... a,(characterno) ; getscharater from charterno variable
sub ... lookuptable for printing x position. LSB xx111111 = character position MSB 11xxxxxx = ...
