Skip to navigation

⌂ ∞ ▽ Elite on the BBC Micro and NES

Drawing ships: SHIP_ESCAPE_POD

[BBC Micro disc version, Ship blueprints I]

       Name: SHIP_ESCAPE_POD                                         [Show more]
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for an escape pod
  Deep dive: Ship blueprints

    Context: See this variable in context in the source code
 Variations: See code variations for this variable in the different versions
 References: This variable is used as follows:
             * XX21 uses SHIP_ESCAPE_POD




.SHIP_ESCAPE_POD

 EQUB 0 + (2 << 4)      \ Max. canisters on demise = 0
                        \ Market item when scooped = 2 + 1 = 3 (slaves)
 EQUW 16 * 16           \ Targetable area          = 16 * 16

 EQUB LO(SHIP_ESCAPE_POD_EDGES - SHIP_ESCAPE_POD)  \ Edges data offset (low)
 EQUB LO(SHIP_ESCAPE_POD_FACES - SHIP_ESCAPE_POD)  \ Faces data offset (low)

 EQUB 25                \ Max. edge count          = (25 - 1) / 4 = 6
 EQUB 0                 \ Gun vertex               = 0
 EQUB 22                \ Explosion count          = 4, as (4 * n) + 6 = 22
 EQUB 24                \ Number of vertices       = 24 / 6 = 4
 EQUB 6                 \ Number of edges          = 6
 EQUW 0                 \ Bounty                   = 0
 EQUB 16                \ Number of faces          = 16 / 4 = 4
 EQUB 8                 \ Visibility distance      = 8
 EQUB 17                \ Max. energy              = 17
 EQUB 8                 \ Max. speed               = 8

 EQUB HI(SHIP_ESCAPE_POD_EDGES - SHIP_ESCAPE_POD)  \ Edges data offset (high)
 EQUB HI(SHIP_ESCAPE_POD_FACES - SHIP_ESCAPE_POD)  \ Faces data offset (high)

 EQUB 4                 \ Normals are scaled by    =  2^4 = 16
 EQUB %00000000         \ Laser power              = 0
                        \ Missiles                 = 0

.SHIP_ESCAPE_POD_VERTICES

      \    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX   -7,    0,   36,     2,      1,    3,     3,         31    \ Vertex 0
 VERTEX   -7,  -14,  -12,     2,      0,    3,     3,         31    \ Vertex 1
 VERTEX   -7,   14,  -12,     1,      0,    3,     3,         31    \ Vertex 2
 VERTEX   21,    0,    0,     1,      0,    2,     2,         31    \ Vertex 3

.SHIP_ESCAPE_POD_EDGES

    \ vertex1, vertex2, face1, face2, visibility
 EDGE       0,       1,     3,     2,         31    \ Edge 0
 EDGE       1,       2,     3,     0,         31    \ Edge 1
 EDGE       2,       3,     1,     0,         31    \ Edge 2
 EDGE       3,       0,     2,     1,         31    \ Edge 3
 EDGE       0,       2,     3,     1,         31    \ Edge 4
 EDGE       3,       1,     2,     0,         31    \ Edge 5

.SHIP_ESCAPE_POD_FACES

    \ normal_x, normal_y, normal_z, visibility
 FACE       52,        0,     -122,         31    \ Face 0
 FACE       39,      103,       30,         31    \ Face 1
 FACE       39,     -103,       30,         31    \ Face 2
 FACE     -112,        0,        0,         31    \ Face 3