How to compile pixels?
12-03-2019, 04:34 PM
Post: #1
 heavensabove Junior Member Posts: 10 Joined: Dec 2019
How to compile pixels?
In the house 49g+/48gii aur have such a program:GROB number,then plot it.I want to know how to get that string of hexadecimal digits.

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12-03-2019, 08:45 PM
Post: #2
 Christoph Giesselink Member Posts: 179 Joined: Dec 2013
RE: How to compile pixels?
The graphic example:
Code:
 OOOOO O     O O   O O O     OO O     O  OOOOO    O   OOO   O  O O O O O  O  O O  O   O O  O   O O     O O  O     O

The graphic is coded line per line. The graphic has a width of 9 we habe to spend 2 bytes (a multiple of 8) per line.

Let's split the graphic into nibbles, bit 0 first. The headline shows the value of each bit.

Code:
1248|1248|1248|1248  OOO|OO  |    | O   |  O |    | O   |O O |    | O   |  OO|    | O   |  O |    |  OOO|OO  |    |    O|    |    |   OO|O   |O   |  O O| O O|    | O  O|  O |    | O  O|    |    |   O |O   |    |  O  | O  |    | O   |  O |O   |  O  |   O|    |

So looking at first Line replacing the blank with 0 the 'O' with 1

Line1, Nibble 0 = 0111 -> reverse -> 1110 -> E
Line1, Nibble 1 = 1100 -> reverse -> 0011 -> 3
Line1, Nibble 2 = 0000 -> reverse -> 0000 -> 0
Line1, Nibble 3 = 0000 -> reverse -> 0000 -> 0

Line2, Nibble 0 = 1000 -> reverse -> 0001 -> 1
Line2, Nibble 1 = 0010 -> reverse -> 0100 -> 4
Line2, Nibble 2 = 0000 -> reverse -> 0000 -> 0
Line2, Nibble 3 = 0000 -> reverse -> 0000 -> 0

so doing the next lines until end.

GROB width height

E300
1400
1500
1C00
1400
E300
8000
C110
AA00
9400
9000
4100
2200
1410
2800

Written in the example:

GROB 9 15 E300
140015001C001400E300
8000C110AA0094009000
4100220014102800
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