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<1234567…34>
  • DRAW x,y,a Algorithm - how does the ROM do it?Hi all, Getting on with SpecOS, and one of the things I would love to do is to preserve the original ROM's behaviour when drawing Arcs. This is don…

    ... original ROM's behaviour when drawing Arcs. This is done ... in BASIC - but not the arc drawing part!

    I ... of the explanation of the algorithm...

    So if ... or Pascal!) implementation of the Arc drawing algorithm implemented by the ROM. Just ...
    Dunny Dunny August 2010 Sinclair Basic
  • Bresenham's line algorithmHelp - I really am struggling to get my head around this algorithm. I don't know why, I coped with Cordic (SIN/COS) and integer divide routines (/10 …

    ... get my head around this algorithm. I don't know ... am having problems coding this algorithm despite the existence of ... given for CIRCLE and DRAW ARC).

    The Z88 ... the line
    ;Bresenham line drawing algorithm poorly implemented in the following ...
    Jimmy Jimmy August 2008 Development
  • 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…

    ... of coding a Bresenham line drawing algorithm on the Speccy?

    algorithm has quite a few steps ...
    joefish joefish March 2019 Development
  • Best way to store vector images in Sinclair BASIC?Let's forget for a moment that Sinclair BASIC is slow. If I have a picture made entirely of vector images, what would be the best way to store that d…

    ... have to implement a new drawing algorithm. You can poke a stream ... other values to change drawing mode to an arc, a circle etc ... to Basin editors! A vector drawing tool which can export as ...
    Arda Arda May 2009 Sinclair Basic
  • Books on Programming (ZX Assembler )Before you ask I trawl eBay on a daily/hourly basis. Any books in VGC wanted on programming games for the ZX Spectrum 48K. No creased, defaced or mi…

    ... still have the circle and arc-drawing code to annotate. There is ...
    Geoff Geoff April 2002 Wanted
  • Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…

    ... mentioned -- time your sprite drawing so that it occurs when ... , you need a sophisticated drawing algorithm that effectively knows which parts ... of such a sprite algorithm in action at my ... under Sprite Pack. This particular algorithm has other flaws, however, ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • Wireframe GraphicsI'm trying to get my head round 3d / wireframe graphics and not really having much luck. I've had a good look on google, but mostly come up with wir…

    ... point calculations, matrix calculations, line drawing algorithm, all sorts of speed optimization ...
    Shiru Shiru January 2009 Development
  • HyperSports: Weight LiftingI swear it is physically impossible to lift [B]6. MIDDLE HEAVY 225kg[/B] or above. this has always annoyed me because I've always wanted to do this g…

    ... the Daley one - which used arc drawing code. My was fast and ...
    frobush frobush September 2009 Games
  • 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 …

    Looks as if you are ready for 'Bresenham' who's approach excludes the [I]sqrt[/I] function, and only uses sum and multiplication.
    [URL]http://cprogramtutorials.blogspot.nl/2011/09/bresenhams-ellipse-drawing-algorithm-c.html[/URL]
    roko roko November 2012 Development
  • 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 …

    I got the Bresenham algorithm working in Z80 assembler for ... /> 1 REM BRESENHAM'S ELLIPSE DRAWING ALGORITHM
    1010 INPUT "Enter centre ...
    Battle Bunny Battle Bunny November 2012 Development
  • Drawing ovals...Hi Folks, Is it possible to draw an oval using the Sinclar BASIC DRAW commend and the 3rd parameter? I have been trying (and failing). Many thanks…

    ... /bresenhamscircleellipsedrawingalgorithm/bresenham-s-circle-ellipse-drawing-algorithm[/url]

    Bresenham algo ...
    g0blinish g0blinish March 2013 Sinclair Basic
  • Drawing ovals...Hi Folks, Is it possible to draw an oval using the Sinclar BASIC DRAW commend and the 3rd parameter? I have been trying (and failing). Many thanks…

    ... mentioned is the Bresenham approximation algorithm, which is quicker than using ... /> 1 REM BRESENHAM'S ELLIPSE DRAWING ALGORITHM
    2 GO TO 1010 ...
    Battle Bunny Battle Bunny March 2013 Sinclair Basic
  • 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…

    ... , is there a faster circle drawing algorithm than the one I chose?
    JonB JonB October 2013 Sinclair Basic
  • 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…

    ... , is there a faster circle drawing algorithm than the one I chose ... ) It depends on your current algorithm, which I can only guess ...
    Timmy Timmy October 2013 Sinclair Basic
  • Pseudocode for CIRCLE algorithm?Can anyone provide me with the pseudocode for the Spectrum's CIRCLE algorithm? My machine code knowledge isn't up to reading the ROM routine. I'm try…

    ... .org/bresenhams-circle-drawing-algorithm/"]https://geeksforgeeks.org/bresenhams-circle-drawing-algorithm/[/url]
    dbolli dbolli August 2020 BASIC
  • 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…

    ... have too many functions like drawing an arc, calculating offsets etc.
    algorithm" is the fastest one and ... an implementation of Bresenham's algorithm, but as I tested it ...
    Arda Arda January 2012 Development
  • Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…

    I've coded sprite drawing before and know all the ... -wise shifts.


    Drawing to screen:

    1 ... screen, and somehow synchonize your drawing so that the screen refresh ... would be my first sprite-drawing routine for spectrum, so being ...
    windenNTW windenNTW July 2003 Games
  • Dan Dare 256 colour project many may not be aware of.I still need/want to try Vladimir's emulator. But I think many people here aren't aware of another 256 colour project, which was mentioned on C.S.S. …

    ... /> on the real site. The algorithm is trivial, and is perfectly ...
    Sadako Sadako March 2004 Emulators
  • 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…

    ... based on a differential update algorithm. It achieves flicker-free status ... on-screen but by only drawing completed graphics all at one ... future. Because of the display algorithm SP1 uses, it is best ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Development
  • ANN - ZXSoftware.co.uk Update V1.5 21/05/06ZXSoftware has now been updated to V1.5. Changes :- 299 new titles have been added - Listed below. A few thousend new ingame screenshots and loadin…

    ... Quiz - General Knowledge Kosmos
    Arc of Yesod, The Thor Computer ... Firebird Software Ltd
    Circuit Drawing / A.C. Network Analyser
    ADJB ADJB May 2006 Announcements
  • 3d line drawinganybody know of any tutorials or got any examples of 3d line drawing / rotation ?l

    anybody know of any tutorials or got any examples of 3d line drawing / rotation ?l
    Saboteur Saboteur October 2006 Development
  • Your views on...The Arc of Yesod[url=http://www.worldofspectrum.org/infoseek.cgi?regexp=^Arc+of+Yesod%2c+The$&pub=^Thor+Computer+Software$&loadpics=on]The Arc of Yesod[/url] OK! Th…

    ... .worldofspectrum.org/infoseek.cgi?regexp=^Arc+of+Yesod%2c+The$& ... +Software$&loadpics=on]The Arc of Yesod[/url]

    CUCHULAINN CUCHULAINN April 2007 Games
  • Fate of the Spectrum drawing board?Dear All, I thought you might be interested, or even relieved to hear that the Science Museum has agreed today to take the drawing board as a permane…

    ... agreed today to take the drawing board as a permanent aquisition ...
    rickdickinson rickdickinson May 2007 Chit chat
  • Vector drawing routines.Anybody could point me to some sort of vector drawing package of routines, callable from BASIC? With "vector drawing" I mean to draw 2D pictures with…

    ... to some sort of vector drawing package of routines, callable from ... BASIC? With "vector drawing" I mean to draw 2D ...
    na_th_an na_th_an October 2007 Development
  • Bresenhams circle algorithmI post here my final circle code to replace, if you want, the one in the ROM. It only uses integer math and runs very fast and is very compact. It is…

    ... />


    ;Bresenhams circle algorithm calculates the locations of the ...
    rtunes rtunes September 2008 Development
  • Cobra's ArcMartijn, the game Cobra's Arc by Dinamic is also called Cobras Arc (without the '), If you take a look at the front and back cover. cheers! ;)

    Martijn, the game Cobra's Arc by Dinamic is also called Cobras Arc (without the '), If you take a look at the front and back cover.

    cheers! ;)
    Ivanzx Ivanzx February 2009 Infoseek database
  • Any curve algorithm experts here?I'm wondering if any of you can help the helpless here. I'm just working on the Xmas Special intro animation, and I have a set of 3D points which des…

    ... anyone know of a good algorithm that produces a "nice-looking ...
    NickH NickH October 2009 Chit chat
  • Route Diagram Search Algorithm?With regard to a diagram of the sort of which the picture below is a simple example. Given that routes are restricted to those going down the screen,…

    ... so on). Is there an algorithm whereby I can determine if ...
    Battle Bunny Battle Bunny October 2010 Development
  • A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…

    ... to speed up the line drawing for the [URL="http ... with an asm Bresenham's drawing routine. The routine was ... ; ---------------------------------------------------------------------
    ; DRAW using Bresenham's algorithm and screen positioning
    ; Copyleft ...
    boriel boriel December 2010 Development
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