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P/PixTxt1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_19.ADF |
| Filename: | P/PixTxt1 |
| Read OK: | ✔ |
| File size: | 157E bytes |
| Load address: | 50224556 |
| Exec address: | 78547869 |
File contents
P i x e l M a p p e r
Anyone who continued their Micro User subscription
long enough tosee the change of name to "Acorn Computing"
might have noticed that "Pixel Mapper", a program
published for the BBC Micro in October/November1992 did
not work on the Electron. This was a shame, as it was
actually avery clever program to distort pictures into
virtually any shape youwanted. I have now found, and
sorted out, the problem (a minor differencein the address
of a look-up table in the OS ROM). I have also added a few
new facilities, including a simple menu.
The program is in two main parts, a Shaper and a
Mapper. The firstis basically a simple art program. Using
this, you design the shape youwant to fit your picture
into. Then the Mapper will convert your picture(which can
be a screen file of any size in any graphics mode)
line-by-lineto fit the shape you designed.
The Shaper is different from most art programs, as
it isobject-orientated. This means that its files are
stored as a series ofshapes in the order you drew them,
rather than an ordinary pixel-basedscreen file. This has
the advantage that the files are very small, andalso they
can be re-drawn in any screen mode. However, it does mean
thatmistakes can be difficult to correct. For this reason,
the originalversion had no facility to re-load a saved
shape file, or to delete ashape drawn in the wrong place
(it was assumed that the shapes used forthe Pixel Mapper
would be very simple, so there would be nothing to loseby
clearing the screen and starting again if the result was
notsatisfactory). I have added these two facilities, but
unfortunately theprogram would not run with the ADFS in
Mode 1 as it was supposed to (mostBBC Micro owners use the
DFS, which has PAGE set at &1900, not &1D00). Toget round
this, I have provided the option of running it in either
Mode 4or 5 (with obvious advantages/drawbacks).
The controls for the shaper are as follows:
G: Lock cursor to grid { you are given the option
to choose the size of the grid, and whether or not
to display it, when the program is run.}
N : Unlock cursor from grid
O : Return cursor to origin
F : Select foreground colour
B : Select background colour (erase)
T : Draw triangle (use space bar to fix other two points)
R : Draw rectangle (use space bar to fix opposite point)
C : Make n-sided polygon (use a large value to draw a
circle)
Space : Fix corner of object
Arrow keys : Move cursor
+Shift : Move cursor faster } not if cursor is
+Control : Move cursor faster still } locked to grid.
Q : Quit the program (return to menu)
Func/, : Load shape file
Func/. : Save shape file
Shift/D: Delete last object drawn (or cancel current one)
Escape : Cancel current operation
L : Display number of objects left (this was included
because memory was very tight in the original
Mode 1 version, so only 15objects were allowed.
Now there is room for about 300, so you shouldn't
need to use thisoption)
The operation of the Mapper program is fairly
self-explanatory.You are first asked to enter the Mode of
the screen file you want todistort. In some cases, you can
also select the destination mode. You arethen asked for
the vertical height of the picture - this enables you to
enlarge a small picture to fill the whole screen.
I have also included a new option - to select
between a shape file(designed using the Shaper) and an
ordinary screen file. If you choose tomap on to a screen
designed using an art program (such as the ElectronUser's
Elkpaint), then all colours except Colour 0 will be treated
asforeground. However, bear in mind that a screen file
will only work in itsoriginal Mode, and will use up a lot
of disc space. It can be possible,using the mapper to
change the Mode of a screen file, by simply mappingit on
to a large box filling the whole screen.
Again memory is very tight if you are running the
Mapper fromADFS, so you may have to cut down on the REM
statements at the start ifyou make any changes. I have
unfortunately had to join many of the linestogether to
make it run.
Acorn Computing published four sample shape files.
These are savedin a directory called "S", under the
filenames "Distanc", "Hrglass","Wobble", and "Wrap". You
might like to try them out using the titlescreens from a
few games - most Superior Software title screens are in
Mode 5, and have a vertical length of 208 pixels. Best
results are usuallyachieved using Mode 1 as a destination
mode (though this does takeconsiderably longer than Mode
5). Acorn Computing illustrated theirarticle by mapping
the title screen from Barbarian on to the shape of aPolo
mint!
Matthew Ford
THIS IS REALLY INTERESTING. I WAS ONE ON THOSE WHO STOPPED
BUYING MOST OF THE COMPUTING MAGAZINES. AFTER READING THIS
ARTICLE I MIGHT JUST BUY A COPY OF ACORN COMPUTING. PERHAPS
IT IS WORTH ANOTHER LOOK.
THIS ARTICLE WAS ORIGINALLY SENT FOR EUG18 BUT HAD TO BE
HELD OVER BECAUSE OF LACK OF SPACE. THE VERSION OF ELKPAINT
REFERED TO IS IN EUG18.
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00000c90 20 73 6f 20 79 6f 75 20 73 68 6f 75 6c 64 6e 27 | so you shouldn'|
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000013e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00001410 0d 4d 61 74 74 68 65 77 20 46 6f 72 64 0d 0d 54 |.Matthew Ford..T|
00001420 48 49 53 20 49 53 20 52 45 41 4c 4c 59 20 49 4e |HIS IS REALLY IN|
00001430 54 45 52 45 53 54 49 4e 47 2e 20 49 20 57 41 53 |TERESTING. I WAS|
00001440 20 4f 4e 45 20 4f 4e 20 54 48 4f 53 45 20 57 48 | ONE ON THOSE WH|
00001450 4f 20 53 54 4f 50 50 45 44 20 0d 42 55 59 49 4e |O STOPPED .BUYIN|
00001460 47 20 4d 4f 53 54 20 4f 46 20 54 48 45 20 43 4f |G MOST OF THE CO|
00001470 4d 50 55 54 49 4e 47 20 4d 41 47 41 5a 49 4e 45 |MPUTING MAGAZINE|
00001480 53 2e 20 41 46 54 45 52 20 52 45 41 44 49 4e 47 |S. AFTER READING|
00001490 20 54 48 49 53 20 0d 41 52 54 49 43 4c 45 20 49 | THIS .ARTICLE I|
000014a0 20 4d 49 47 48 54 20 4a 55 53 54 20 42 55 59 20 | MIGHT JUST BUY |
000014b0 41 20 43 4f 50 59 20 4f 46 20 41 43 4f 52 4e 20 |A COPY OF ACORN |
000014c0 43 4f 4d 50 55 54 49 4e 47 2e 20 50 45 52 48 41 |COMPUTING. PERHA|
000014d0 50 53 20 0d 49 54 20 49 53 20 57 4f 52 54 48 20 |PS .IT IS WORTH |
000014e0 41 4e 4f 54 48 45 52 20 4c 4f 4f 4b 2e 0d 0d 54 |ANOTHER LOOK...T|
000014f0 48 49 53 20 41 52 54 49 43 4c 45 20 57 41 53 20 |HIS ARTICLE WAS |
00001500 4f 52 49 47 49 4e 41 4c 4c 59 20 53 45 4e 54 20 |ORIGINALLY SENT |
00001510 46 4f 52 20 45 55 47 31 38 20 42 55 54 20 48 41 |FOR EUG18 BUT HA|
00001520 44 20 54 4f 20 42 45 20 0d 48 45 4c 44 20 4f 56 |D TO BE .HELD OV|
00001530 45 52 20 42 45 43 41 55 53 45 20 4f 46 20 4c 41 |ER BECAUSE OF LA|
00001540 43 4b 20 4f 46 20 53 50 41 43 45 2e 20 54 48 45 |CK OF SPACE. THE|
00001550 20 56 45 52 53 49 4f 4e 20 4f 46 20 45 4c 4b 50 | VERSION OF ELKP|
00001560 41 49 4e 54 20 0d 52 45 46 45 52 45 44 20 54 4f |AINT .REFERED TO|
00001570 20 49 53 20 49 4e 20 45 55 47 31 38 2e 0d | IS IN EUG18..|
0000157e 
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