The SHIP_GECKO (Bank 1) variable - Elite on the BBC Micro and NES

       Name: SHIP_GECKO                                              [Show more]
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for a Gecko
  Deep dive: Ship blueprints
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * Unused copy of XX21 uses SHIP_GECKO
             * XX21 uses SHIP_GECKO


.SHIP_GECKO

 EQUB 0                 ; Max. canisters on demise = 0
 EQUW 99 * 99           ; Targetable area          = 99 * 99

 EQUB LO(SHIP_GECKO_EDGES - SHIP_GECKO)            ; Edges data offset (low)
 EQUB LO(SHIP_GECKO_FACES - SHIP_GECKO)            ; Faces data offset (low)

 EQUB 69                ; Max. edge count          = (69 - 1) / 4 = 17
 EQUB 0                 ; Gun vertex               = 0
 EQUB 26                ; Explosion count          = 5, as (4 * n) + 6 = 26
 EQUB 72                ; Number of vertices       = 72 / 6 = 12
 EQUB 17                ; Number of edges          = 17
 EQUW 55                ; Bounty                   = 55
 EQUB 36                ; Number of faces          = 36 / 4 = 9
 EQUB 18                ; Visibility distance      = 18
 EQUB 70                ; Max. energy              = 70
 EQUB 30                ; Max. speed               = 30

 EQUB HI(SHIP_GECKO_EDGES - SHIP_GECKO)            ; Edges data offset (high)
 EQUB HI(SHIP_GECKO_FACES - SHIP_GECKO)            ; Faces data offset (high)

 EQUB 3                 ; Normals are scaled by    = 2^3 = 8
 EQUB %00010000         ; Laser power              = 2
                        ; Missiles                 = 0

.SHIP_GECKO_VERTICES

      ;    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX  -10,   -4,   47,     3,      0,    5,     4,         31    ; Vertex 0
 VERTEX   10,   -4,   47,     1,      0,    3,     2,         31    ; Vertex 1
 VERTEX  -16,    8,  -23,     5,      0,    7,     6,         31    ; Vertex 2
 VERTEX   16,    8,  -23,     1,      0,    8,     7,         31    ; Vertex 3
 VERTEX  -66,    0,   -3,     5,      4,    6,     6,         31    ; Vertex 4
 VERTEX   66,    0,   -3,     2,      1,    8,     8,         31    ; Vertex 5
 VERTEX  -20,  -14,  -23,     4,      3,    7,     6,         31    ; Vertex 6
 VERTEX   20,  -14,  -23,     3,      2,    8,     7,         31    ; Vertex 7
 VERTEX   -8,   -6,   33,     3,      3,    3,     3,         16    ; Vertex 8
 VERTEX    8,   -6,   33,     3,      3,    3,     3,         17    ; Vertex 9
 VERTEX   -8,  -13,  -16,     3,      3,    3,     3,         16    ; Vertex 10
 VERTEX    8,  -13,  -16,     3,      3,    3,     3,         17    ; Vertex 11

.SHIP_GECKO_EDGES

    ; vertex1, vertex2, face1, face2, visibility
 EDGE       0,       1,     3,     0,         31    ; Edge 0
 EDGE       1,       5,     2,     1,         31    ; Edge 1
 EDGE       5,       3,     8,     1,         31    ; Edge 2
 EDGE       3,       2,     7,     0,         31    ; Edge 3
 EDGE       2,       4,     6,     5,         31    ; Edge 4
 EDGE       4,       0,     5,     4,         31    ; Edge 5
 EDGE       5,       7,     8,     2,         31    ; Edge 6
 EDGE       7,       6,     7,     3,         31    ; Edge 7
 EDGE       6,       4,     6,     4,         31    ; Edge 8
 EDGE       0,       2,     5,     0,         29    ; Edge 9
 EDGE       1,       3,     1,     0,         30    ; Edge 10
 EDGE       0,       6,     4,     3,         29    ; Edge 11
 EDGE       1,       7,     3,     2,         30    ; Edge 12
 EDGE       2,       6,     7,     6,         20    ; Edge 13
 EDGE       3,       7,     8,     7,         20    ; Edge 14
 EDGE       8,      10,     3,     3,         16    ; Edge 15
 EDGE       9,      11,     3,     3,         17    ; Edge 16

.SHIP_GECKO_FACES

    ; normal_x, normal_y, normal_z, visibility
 FACE        0,       31,        5,         31    ; Face 0
 FACE        4,       45,        8,         31    ; Face 1
 FACE       25,     -108,       19,         31    ; Face 2
 FACE        0,      -84,       12,         31    ; Face 3
 FACE      -25,     -108,       19,         31    ; Face 4
 FACE       -4,       45,        8,         31    ; Face 5
 FACE      -88,       16,     -214,         31    ; Face 6
 FACE        0,        0,     -187,         31    ; Face 7
 FACE       88,       16,     -214,         31    ; Face 8

[X]

Macro EDGE (category: Drawing ships)

Macro definition for adding edges to ship blueprints

[X]

Macro FACE (category: Drawing ships)

Macro definition for adding faces to ship blueprints

[X]

Variable SHIP_GECKO (category: Drawing ships)

Ship blueprint for a Gecko

[X]

Label SHIP_GECKO_EDGES is local to this routine

[X]

Label SHIP_GECKO_FACES is local to this routine

[X]

Macro VERTEX (category: Drawing ships)

Macro definition for adding vertices to ship blueprints

Drawing ships: SHIP_GECKO

[NES version, Bank 1]