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Elite on the BBC Micro

Version analysis of SHIP_CANISTER

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_CANISTER Type: Variable Category: Drawing ships Summary: Ship blueprint for a cargo canister Deep dive: Ship blueprints
.SHIP_CANISTER EQUB 0 \ Max. canisters on demise = 0 EQUW 20 * 20 \ Targetable area = 20 * 20 EQUB LO(SHIP_CANISTER_EDGES - SHIP_CANISTER) \ Edges data offset (low) EQUB LO(SHIP_CANISTER_FACES - SHIP_CANISTER) \ Faces data offset (low)

Code variation 1 of 1Related to an advanced feature

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

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

Cassette, Flight, Docked, Electron

6502SP, Master

EQUB 49 \ Max. edge count = (49 - 1) / 4 = 12
EQUB 53 \ Max. edge count = (53 - 1) / 4 = 13
 EQUB 0                 \ Gun vertex               = 0
 EQUB 18                \ Explosion count          = 3, as (4 * n) + 6 = 18
 EQUB 60                \ Number of vertices       = 60 / 6 = 10
 EQUB 15                \ Number of edges          = 15
 EQUW 0                 \ Bounty                   = 0
 EQUB 28                \ Number of faces          = 28 / 4 = 7
 EQUB 12                \ Visibility distance      = 12
 EQUB 17                \ Max. energy              = 17
 EQUB 15                \ Max. speed               = 15
 EQUB HI(SHIP_CANISTER_EDGES - SHIP_CANISTER)      \ Edges data offset (high)
 EQUB HI(SHIP_CANISTER_FACES - SHIP_CANISTER)      \ Faces data offset (high)
 EQUB 2                 \ Normals are scaled by    = 2^2 = 4
 EQUB %00000000         \ Laser power              = 0
                        \ Missiles                 = 0

\VERTEX    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX   24,   16,    0,     0,      1,    5,     5,         31    \ Vertex 0
 VERTEX   24,    5,   15,     0,      1,    2,     2,         31    \ Vertex 1
 VERTEX   24,  -13,    9,     0,      2,    3,     3,         31    \ Vertex 2
 VERTEX   24,  -13,   -9,     0,      3,    4,     4,         31    \ Vertex 3
 VERTEX   24,    5,  -15,     0,      4,    5,     5,         31    \ Vertex 4
 VERTEX  -24,   16,    0,     1,      5,    6,     6,         31    \ Vertex 5
 VERTEX  -24,    5,   15,     1,      2,    6,     6,         31    \ Vertex 6
 VERTEX  -24,  -13,    9,     2,      3,    6,     6,         31    \ Vertex 7
 VERTEX  -24,  -13,   -9,     3,      4,    6,     6,         31    \ Vertex 8
 VERTEX  -24,    5,  -15,     4,      5,    6,     6,         31    \ Vertex 9

.SHIP_CANISTER_EDGES

\EDGE vertex1, vertex2, face1, face2, visibility
 EDGE       0,       1,     0,     1,         31    \ Edge 0
 EDGE       1,       2,     0,     2,         31    \ Edge 1
 EDGE       2,       3,     0,     3,         31    \ Edge 2
 EDGE       3,       4,     0,     4,         31    \ Edge 3
 EDGE       0,       4,     0,     5,         31    \ Edge 4
 EDGE       0,       5,     1,     5,         31    \ Edge 5
 EDGE       1,       6,     1,     2,         31    \ Edge 6
 EDGE       2,       7,     2,     3,         31    \ Edge 7
 EDGE       3,       8,     3,     4,         31    \ Edge 8
 EDGE       4,       9,     4,     5,         31    \ Edge 9
 EDGE       5,       6,     1,     6,         31    \ Edge 10
 EDGE       6,       7,     2,     6,         31    \ Edge 11
 EDGE       7,       8,     3,     6,         31    \ Edge 12
 EDGE       8,       9,     4,     6,         31    \ Edge 13
 EDGE       9,       5,     5,     6,         31    \ Edge 14

.SHIP_CANISTER_FACES

\FACE normal_x, normal_y, normal_z, visibility
 FACE       96,        0,        0,         31    \ Face 0
 FACE        0,       41,       30,         31    \ Face 1
 FACE        0,      -18,       48,         31    \ Face 2
 FACE        0,      -51,        0,         31    \ Face 3
 FACE        0,      -18,      -48,         31    \ Face 4
 FACE        0,       41,      -30,         31    \ Face 5
 FACE      -96,        0,        0,         31    \ Face 6

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