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Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... need to use it very often, except maybe for the PLOT, DRAW ... and CIRCLE routines, which compute the address of every pixel to ... X3 X2 X1 X0
Y coordinate: Y7 Y6 Y5 Y4 Y3 Y2 Y1 ... .
To the software, the routine to display a character ... -
URGENT programming question !I've gotta draw a line from machine code using the standard routine at 24B7, which expects the delta-X and delta-Y values on the BASIC stack. I put t…
Hey, mystery solved !!! I know how to do it - I push X1 and X2 on the stack, call RST #28 to subtract them, push Y1 and Y2 on the stack, call RST #28 to subtract, and call the DRAW routine.]
Can't believe it was so easy. :) -
Pixel LimitIF Y3<192 THEN : LET x2=INT (128+X*A*SIN A): LET y2=INT (Y3): DRAW INK
... />
1720 FOR A=0 TO INT ((50*3.14)-38 ... -
Bouncing BallsPfrrt, I am back from lunch, playing the first raw version of BOUNCING BALLS It is very addictive! As stated here [URL]http://www.worldofspectru…
... need to be able to handle 60 balls. Due to ... to determine if a ball lies inside the circle, or draw ... might get tricky due to the explosions overlapping. It ... /> For collision I want to use our friend Pythagoras.
D = SQR ( (X1-X2)^2+(Y1-Y2)^2 )
When D -
1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... on how to increase in-game speed to "playable"? ... Introduce simple clipping rectangle. Then test every figure you draw ... intersect test. And only draw it if intersection is ... RectA.X2 > RectB.X1 &&
RectA.Y1 > RectB.Y2 ... -
Short unattended type-in'sThis follows a similar topic on the BBC/Acorn forum (said topic can be found [url="https://stardot.org.uk/forums/viewtopic.php?f=2&t=14919"]here[/url…
... LET X1=0: LET Y1=0
30 FOR C=0 TO 7 ... STEP .1
40 LET X2=INT (RND*256) : LET Y2 ... DRAW INK C,X2-X1,Y2-Y1: GOTO 70
60 DRAW OVER 1; INK 0;X2-X1,Y2-Y1 ...
70 LET X1=X2: LET Y1=Y2: NEXT ... -
Repton ManiaHi all, I am the creator, and look after, the Repton Resource Page ([url]www.reptonresourcepage.co.uk[/url]). For the site, I have written a freely …
... the screen memory (0x4000 to 0x57FF & 0x5800 to 0x5AFF)
0x08772 ... the screen memory (0x4000 to 0x57FF & 0x5800 to 0x5AFF)
0x1199C ... /> 0x13ED8 0xD1D4 Sequence of colours to animate Repton 2 banner
Y2 Y1 Y0 Y5 Y4 Y3 X4 X3 X2 X1 X0
Quickest Assembly to find if point in rectangleWhat is the fastest way to see if a point is in a rectangle. e.g rectangle is 10,10 100,10 100,40 10,40 how do i know if a point (e.g 20,20) is in…
This seems to work
[code]
... /> ; h=x1 , l=y1 (Rect top left)
; d=x2 , e=y2 (Rect bottom ... to test)
; if x>=x1 then
; if x=y1 ...Quickest Assembly to find if point in rectangleWhat is the fastest way to see if a point is in a rectangle. e.g rectangle is 10,10 100,10 100,40 10,40 how do i know if a point (e.g 20,20) is in…
... , robpearmain wrote:
This seems to work
[code]< ... /> ; h=x1 , l=y1 (Rect top left)
; d=x2 , e=y2 (Rect bottom ... , c=y (x,y point to test)
ld ... 0, you can set COL to 0 faster with
...Looking for 'Your Computer' gravity simulation type inHi, In one of the old Your Computer mags, in the type in progs section near the back, there was a Speccy program which simulated interaction between…
... : LET a1=30: LET x1=20: LET y1=20: LET m2=10 ... : LET a2=250: LET x2=100: LET y2=100: LET g=15 ... . Some of the bodies seems to push themselves instead of pulling ... test it on visual basic to see it on a larger ...Game OptimisationBelow is a section of code Im using for movement enermy display and collision detect. What happens is that you move the sight with ,.qa and space do…
... )
I want to have multiple bad guys on ... are not always the way to go.
... For speed is it correct to use an array like that ... let x1 = 10 : rem enermy 1 x position
let y1 = 10 ... let x2 = 11 : rem enermy 1 x position
let y2 = 12 ...Optimize this: Distance CalculationBased on a taylor series expansion, suggested by NA_TH_AN, I've got this so far, which is far far faster than SQR(X^2+y^2) Formula is: in a right an…
That's an interesting idea.
It's certainly as feasible to say
if SQR((x1-x2)^2+(y1-y2)^2)WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …
... /> 160 REM DRAW LINES
170 FOR N=1 TO 50
190 LET X2=INT (RND*64)
200 LET Y1=INT (RND ... br /> 210 LET XS=SGN (X2-X1)
215 REM SET NUMBER ... NS=ABS (X2-X1)
230 FOR S=1 TO NS
240 ... LET X=X1+S*XS
250 LET Y=Y1
...WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …
... /> 160 REM DRAW LINES
170 FOR N=1 TO 50
180 LET X1=INT (RND*64)
190 LET Y1=INT (RND ...
210 LET YS=SGN (Y2-Y1)
215 REM SET NUMBER ... (Y2-Y1)
230 FOR S=1 TO NS
240 LET X=X1 ...
250 LET Y=Y1 ...Trigonometric find angleHi guys, anyone knows a formula to calculate an angle between two coordinates, using basic?s function ATN , recent programming tools have ATAN2(dy,dx…
... fixed rem range -32767.9999847 to 32767.9999847
cls ... /> function getangle (x1 as ubyte,y1 as ubyte,x2 as ubyte,y2 as ubyte ... ) as fixed
dx=x2-x1
dy=y2-y1 ...Trigonometric find angleHi guys, anyone knows a formula to calculate an angle between two coordinates, using basic?s function ATN , recent programming tools have ATAN2(dy,dx…
... there, changed all to fixed and added 90 to final result, and ... it seem to work :D ... /> function getangle (x1 as fixed,y1 as fixed,x2 as fixed,y2 as fixed ... ) as fixed
dx=x2-x1
dy=y2-y1 ...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 …
... |x4|x3|x2|x1|x0 & y7|y6|y5|y4|y3|y2|y1|y0 ... /> 0|1|0|y7|y6|y2|y1|y0|y5|y4|y3|x7 ... in there that used calculation to figure a screen address...it ...Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
To be honest I feel like ... /> FOR f = 0 to 100: PLOT x1+(x2-x1)*(f/100), y1+(y2-y1)*(f/100): NEXT ...Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
[QUOTE=Timmy;777950]To be honest I feel like ... /> FOR f = 0 to 100: PLOT x1+(x2-x1)*(f/100), y1+(y2-y1)*(f/100): NEXT ...Grammar-based data compressionI'm working on a game for the 48k Spectrum but want a way to compress a lot of screens into a small space, so I'm looking into data compression. Each…
... repeated the most. Something similar to your 'grammar' idea may be ... another template could follow that to block up different combinations of ... maybe there's a template to place common multi-block features ... ,X1,X2,Y for horizontal rows of character N and N,X,Y1,Y2 ...Calculate if two segments cross in assemblerHello, Im developing a little game and I need something that I cant archieve. I have two lines (segment of a line). Line one: X11=coord X of …
... ) This reduces number of pixels to check ... to pixels inside intersection.
to each other. You can divide (x2-x1), and (y2-y1) by 2 ... ) and use bisection to bring them closer to each other on iteration ...Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... can I find enough registers to run from both ends ... step-over from one byte to the next horizontally won' ... about how the last byte to write might be held ... is, p = max(abs(x1-x2), abs(y1-y2)) +1. So depending on ... know if the center needs to be plotted twice or ...Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... the number of iterations to get a convincing- ... X1+X2)/2 or more usefully Xm=(X1+X2)>>1 and Ym=(Y1+Y2 ... )>>1 That's the only maths you need to ... to a line segment so short it has no slope (Y2=Y1 ... borders you initially need to clip to, but that's ...Buddy 0.1 demo[url="http://wischner.co.uk/downloads/app.tap"]The tape is here[/url]. Load it, then enable kempston mouse emulation, then reload it. [url="https://g…
... optimized window messaging (create window, draw window, window proc, send message ... anyone is willing to ... this is the time to come up ... x0, byte y0, byte x1, byte y1; and it draws only the ... for a week and dedicate to developing optimized message pump, ...Computer BattlegamesBook Title: [B][URL="http://www.worldofspectrum.org/infoseekid.cgi?id=2000080"]Computer Battlegames[/URL][/B] Authors: [B]Daniel Isaaman & Jenny Tyle…
... print "letter (a-z) to"
50 print "defuse ... 30 print "you are back to back"
40 print ... /> 130 for i=1 to 50
140 if ... /> 50 print "direction (-90 to 90) ?"
60 input ... /> 70 print "elevation (0 to 90) ?"
80 input ...Optimize this: Distance CalculationBased on a taylor series expansion, suggested by NA_TH_AN, I've got this so far, which is far far faster than SQR(X^2+y^2) Formula is: in a right an…
Something like? [QUOTE]D = abs (X1-X2) + abs (Y1 -Y2)[/QUOTE]or what?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…
... I want to draw a bitmap x=10,y=10,x2=100,y2=100 ... ,x2=60,y2=80. Using rectangular intersection I calculate that I need to draw ... bitmap to ... area x=20,y=10,x2=60,y2=80 ...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…
... I want to draw a bitmap x=10,y=10,x2=100,y2=100 ... ,x2=60,y2=80. Using rectangular intersection I calculate that I need to draw ... bitmap to ... area x=20,y=10,x2=60,y2=80 ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... when scanning the television picture to answer your question.
... complete set of values when Y2 Y1 Y0 show all their combinations ... palstuff/]this site (scroll down to AEC Line Glitch)[/url], ... plotted in a DRAW command. As CIRCLE calls DRAW, this computes ...
