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Elite on the BBC Micro

Version analysis of SHIP_ADDER

This code appears in the following versions (click to see it in the source code):

Code variations between these versions are shown below.

Name: SHIP_ADDER Type: Variable Category: Drawing ships Summary: Ship blueprint for an Adder Deep dive: Ship blueprints
.SHIP_ADDER EQUB 0 \ Max. canisters on demise = 0 EQUW 50 * 50 \ Targetable area = 50 * 50 EQUB LO(SHIP_ADDER_EDGES - SHIP_ADDER) \ Edges data offset (low) EQUB LO(SHIP_ADDER_FACES - SHIP_ADDER) \ Faces data offset (low)

Code variation 1 of 2Related to an advanced feature

The advanced versions of Elite have an extra edge count for the ship colour; Adders are shown in cyan.

Tap on a version to expand it, and tap it again to show to all variations.

Flight

6502SP, Master

EQUB 97 \ Max. edge count = (97 - 1) / 4 = 24
EQUB 101 \ Max. edge count = (101 - 1) / 4 = 25
 EQUB 0                 \ Gun vertex               = 0
 EQUB 22                \ Explosion count          = 4, as (4 * n) + 6 = 22
 EQUB 108               \ Number of vertices       = 108 / 6 = 18
 EQUB 29                \ Number of edges          = 29
 EQUW 40                \ Bounty                   = 40
 EQUB 60                \ Number of faces          = 60 / 4 = 15

Code variation 2 of 2Related to the disc version

In the disc version, the Adder has a visibility distance of 23 compared to 20 in the other versions, so if one is running away from you in the disc version, it will turn into a dot later than in the others.

Tap on a version to expand it, and tap it again to show to all variations.

Flight

6502SP, Master

EQUB 23 \ Visibility distance = 23
EQUB 20 \ Visibility distance = 20
 EQUB 85                \ Max. energy              = 85
 EQUB 24                \ Max. speed               = 24
 EQUB HI(SHIP_ADDER_EDGES - SHIP_ADDER)            \ Edges data offset (high)
 EQUB HI(SHIP_ADDER_FACES - SHIP_ADDER)            \ Faces data offset (high)
 EQUB 2                 \ Normals are scaled by    = 2^2 = 4
 EQUB %00010000         \ Laser power              = 2
                        \ Missiles                 = 0

\VERTEX    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX  -18,    0,   40,     1,      0,   12,    11,         31    \ Vertex 0
 VERTEX   18,    0,   40,     1,      0,    3,     2,         31    \ Vertex 1
 VERTEX   30,    0,  -24,     3,      2,    5,     4,         31    \ Vertex 2
 VERTEX   30,    0,  -40,     5,      4,    6,     6,         31    \ Vertex 3
 VERTEX   18,   -7,  -40,     6,      5,   14,     7,         31    \ Vertex 4
 VERTEX  -18,   -7,  -40,     8,      7,   14,    10,         31    \ Vertex 5
 VERTEX  -30,    0,  -40,     9,      8,   10,    10,         31    \ Vertex 6
 VERTEX  -30,    0,  -24,    10,      9,   12,    11,         31    \ Vertex 7
 VERTEX  -18,    7,  -40,     8,      7,   13,     9,         31    \ Vertex 8
 VERTEX   18,    7,  -40,     6,      4,   13,     7,         31    \ Vertex 9
 VERTEX  -18,    7,   13,     9,      0,   13,    11,         31    \ Vertex 10
 VERTEX   18,    7,   13,     2,      0,   13,     4,         31    \ Vertex 11
 VERTEX  -18,   -7,   13,    10,      1,   14,    12,         31    \ Vertex 12
 VERTEX   18,   -7,   13,     3,      1,   14,     5,         31    \ Vertex 13
 VERTEX  -11,    3,   29,     0,      0,    0,     0,          5    \ Vertex 14
 VERTEX   11,    3,   29,     0,      0,    0,     0,          5    \ Vertex 15
 VERTEX   11,    4,   24,     0,      0,    0,     0,          4    \ Vertex 16
 VERTEX  -11,    4,   24,     0,      0,    0,     0,          4    \ Vertex 17

.SHIP_ADDER_EDGES

\EDGE vertex1, vertex2, face1, face2, visibility
 EDGE       0,       1,     1,     0,         31    \ Edge 0
 EDGE       1,       2,     3,     2,          7    \ Edge 1
 EDGE       2,       3,     5,     4,         31    \ Edge 2
 EDGE       3,       4,     6,     5,         31    \ Edge 3
 EDGE       4,       5,    14,     7,         31    \ Edge 4
 EDGE       5,       6,    10,     8,         31    \ Edge 5
 EDGE       6,       7,    10,     9,         31    \ Edge 6
 EDGE       7,       0,    12,    11,          7    \ Edge 7
 EDGE       3,       9,     6,     4,         31    \ Edge 8
 EDGE       9,       8,    13,     7,         31    \ Edge 9
 EDGE       8,       6,     9,     8,         31    \ Edge 10
 EDGE       0,      10,    11,     0,         31    \ Edge 11
 EDGE       7,      10,    11,     9,         31    \ Edge 12
 EDGE       1,      11,     2,     0,         31    \ Edge 13
 EDGE       2,      11,     4,     2,         31    \ Edge 14
 EDGE       0,      12,    12,     1,         31    \ Edge 15
 EDGE       7,      12,    12,    10,         31    \ Edge 16
 EDGE       1,      13,     3,     1,         31    \ Edge 17
 EDGE       2,      13,     5,     3,         31    \ Edge 18
 EDGE      10,      11,    13,     0,         31    \ Edge 19
 EDGE      12,      13,    14,     1,         31    \ Edge 20
 EDGE       8,      10,    13,     9,         31    \ Edge 21
 EDGE       9,      11,    13,     4,         31    \ Edge 22
 EDGE       5,      12,    14,    10,         31    \ Edge 23
 EDGE       4,      13,    14,     5,         31    \ Edge 24
 EDGE      14,      15,     0,     0,          5    \ Edge 25
 EDGE      15,      16,     0,     0,          3    \ Edge 26
 EDGE      16,      17,     0,     0,          4    \ Edge 27
 EDGE      17,      14,     0,     0,          3    \ Edge 28

.SHIP_ADDER_FACES

\FACE normal_x, normal_y, normal_z, visibility
 FACE        0,       39,       10,         31    \ Face 0
 FACE        0,      -39,       10,         31    \ Face 1
 FACE       69,       50,       13,         31    \ Face 2
 FACE       69,      -50,       13,         31    \ Face 3
 FACE       30,       52,        0,         31    \ Face 4
 FACE       30,      -52,        0,         31    \ Face 5
 FACE        0,        0,     -160,         31    \ Face 6
 FACE        0,        0,     -160,         31    \ Face 7
 FACE        0,        0,     -160,         31    \ Face 8
 FACE      -30,       52,        0,         31    \ Face 9
 FACE      -30,      -52,        0,         31    \ Face 10
 FACE      -69,       50,       13,         31    \ Face 11
 FACE      -69,      -50,       13,         31    \ Face 12
 FACE        0,       28,        0,         31    \ Face 13
 FACE        0,      -28,        0,         31    \ Face 14

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