PixMap/Text

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PixMap/Text

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 » EUG_submission_2.ADF
Filename:	PixMap/Text
Read OK:	✔
File size:	1430 bytes
Load address:	54204556
Exec address:	D747865

Duplicates

There is 1 duplicate copy of this file in the archive:

Personal collection » Acorn ADFS disks » Electron » EUG_submission_2.ADF » PixMap/Text
Personal collection » Acorn ADFS disks » Electron » View_1.ADF » EUG/PixMap

File contents

�.........*.......*.......*.......*.......*.......*.......*.......*.......*.<
                       P i x e l   M a p p e r

       Anyone who continued their Micro User subscription long enough to
see the change of name to "Acorn Computing" might have noticed that 
"Pixel Mapper", a program published for the BBC Micro in October/November
1992 did not work on the Electron. This was a shame, as it was actually a
very clever program to distort pictures into virtually any shape you
wanted. I have now found, and sorted out, the problem (a minor difference
in 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 first
is basically a simple art program. Using this, you design the shape you
want 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-line
to fit the shape you designed.
       The Shaper is different from most art programs, as it is
object-orientated. This means that its files are stored as a series of
shapes in the order you drew them, rather than an ordinary pixel-based
screen file. This has the advantage that the files are very small, and
also they can be re-drawn in any screen mode. However, it does mean that
mistakes can be difficult to correct. For this reason, the original
version had no facility to re-load a saved shape file, or to delete a
shape drawn in the wrong place (it was assumed that the shapes used for
the Pixel Mapper would be very simple, so there would be nothing to lose
by clearing the screen and starting again if the result was not
satisfactory). I have added these two facilities, but unfortunately the
program would not run with the ADFS in Mode 1 as it was supposed to (most
BBC Micro owners use the DFS, which has PAGE set at &1900, not &1D00). To
get round this, I have provided the option of running it in either Mode 4
or 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 
     N : Unlock cursor from grid } to display it, when the program is run.
     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 15
          objects were allowed. Now there is room for about 300, so you
          shouldn't need to use this option)

        The operation of the Mapper program is fairly self-explanatory.
You are first asked to enter the Mode of the screen file you want to
distort. In some cases, you can also select the destination mode. You are
then 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 to
map on to a screen designed using an art program (such as the Electron
User's Elkpaint), then all colours except Colour 0 will be treated as
foreground. However, bear in mind that a screen file will only work in its
original 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 mapping
it on to a large box filling the whole screen.
        Again memory is very tight if you are running the Mapper from
ADFS, so you may have to cut down on the REM statements at the start if
you make any changes. I have unfortunately had to join many of the lines
together to make it run.
        Acorn Computing published four sample shape files. These are saved
in a directory called "S", under the filenames "Distanc", "Hrglass",
"Wobble", and "Wrap". You might like to try them out using the title
screens from a few games - most Superior Software title screens are in
Mode 5, and have a vertical length of 208 pixels. Best results are usually
achieved using Mode 1 as a destination mode (though this does take
considerably longer than Mode 5). Acorn Computing illustrated their
article by mapping the title screen from Barbarian on to the shape of a
Polo mint! 
                                                     Matthew Ford

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00000b00  3a 20 4d 6f 76 65 20 63  75 72 73 6f 72 20 66 61  |: Move cursor fa|
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00000b30  20 20 51 20 3a 20 51 75  69 74 20 74 68 65 20 70  |  Q : Quit the p|
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00000b60  20 4c 6f 61 64 20 73 68  61 70 65 20 66 69 6c 65  | Load shape file|
00000b70  0d 46 75 6e 63 2f 2e 20  3a 20 53 61 76 65 20 73  |.Func/. : Save s|
00000b80  68 61 70 65 20 66 69 6c  65 0d 53 68 69 66 74 2f  |hape file.Shift/|
00000b90  44 3a 20 44 65 6c 65 74  65 20 6c 61 73 74 20 6f  |D: Delete last o|
00000ba0  62 6a 65 63 74 20 64 72  61 77 6e 20 28 6f 72 20  |bject drawn (or |
00000bb0  63 61 6e 63 65 6c 20 63  75 72 72 65 6e 74 20 6f  |cancel current o|
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00000bd0  63 65 6c 20 63 75 72 72  65 6e 74 20 6f 70 65 72  |cel current oper|
00000be0  61 74 69 6f 6e 0d 20 20  20 20 20 4c 20 3a 20 44  |ation.     L : D|
00000bf0  69 73 70 6c 61 79 20 6e  75 6d 62 65 72 20 6f 66  |isplay number of|
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00001100  6f 6e 20 74 68 65 20 52  45 4d 20 73 74 61 74 65  |on the REM state|
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00001220  22 57 6f 62 62 6c 65 22  2c 20 61 6e 64 1a 20 22  |"Wobble", and. "|
00001230  57 72 61 70 22 2e 1a 20  59 6f 75 1a 20 6d 69 67  |Wrap".. You. mig|
00001240  68 74 1a 20 6c 69 6b 65  1a 20 74 6f 1a 20 74 72  |ht. like. to. tr|
00001250  79 20 74 68 65 6d 20 6f  75 74 20 75 73 69 6e 67  |y them out using|
00001260  20 74 68 65 20 74 69 74  6c 65 0d 73 63 72 65 65  | the title.scree|
00001270  6e 73 20 66 72 6f 6d 20  61 20 66 65 77 20 67 61  |ns from a few ga|
00001280  6d 65 73 20 2d 20 6d 6f  73 74 20 53 75 70 65 72  |mes - most Super|
00001290  69 6f 72 1a 20 53 6f 66  74 77 61 72 65 1a 20 74  |ior. Software. t|
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000012f0  75 6c 74 73 20 61 72 65  20 75 73 75 61 6c 6c 79  |ults are usually|
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00001350  69 64 65 72 61 62 6c 79  1a 20 6c 6f 6e 67 65 72  |iderably. longer|
00001360  1a 20 74 68 61 6e 1a 20  4d 6f 64 65 1a 20 35 29  |. than. Mode. 5)|
00001370  2e 1a 20 41 63 6f 72 6e  1a 20 43 6f 6d 70 75 74  |.. Acorn. Comput|
00001380  69 6e 67 1a 20 69 6c 6c  75 73 74 72 61 74 65 64  |ing. illustrated|
00001390  20 74 68 65 69 72 0d 61  72 74 69 63 6c 65 20 62  | their.article b|
000013a0  79 20 6d 61 70 70 69 6e  67 20 74 68 65 20 74 69  |y mapping the ti|
000013b0  74 6c 65 20 73 63 72 65  65 6e 20 66 72 6f 6d 20  |tle screen from |
000013c0  42 61 72 62 61 72 69 61  6e 1a 20 6f 6e 1a 20 74  |Barbarian. on. t|
000013d0  6f 1a 20 74 68 65 20 73  68 61 70 65 20 6f 66 20  |o. the shape of |
000013e0  61 0d 50 6f 6c 6f 20 6d  69 6e 74 21 20 0d 20 20  |a.Polo mint! .  |
000013f0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00001420  20 20 20 4d 61 74 74 68  65 77 20 46 6f 72 64 0d  |   Matthew Ford.|
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