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

       Name: SHIP_WORM                                               [Show more]
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for a Worm
  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_WORM
             * XX21 uses SHIP_WORM


.SHIP_WORM

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

 EQUB LO(SHIP_WORM_EDGES - SHIP_WORM)              ; Edges data offset (low)
 EQUB LO(SHIP_WORM_FACES - SHIP_WORM)              ; Faces data offset (low)

 EQUB 77                ; Max. edge count          = (77 - 1) / 4 = 19
 EQUB 0                 ; Gun vertex               = 0
 EQUB 18                ; Explosion count          = 3, as (4 * n) + 6 = 18
 EQUB 60                ; Number of vertices       = 60 / 6 = 10
 EQUB 16                ; Number of edges          = 16
 EQUW 0                 ; Bounty                   = 0
 EQUB 32                ; Number of faces          = 32 / 4 = 8
 EQUB 19                ; Visibility distance      = 19
 EQUB 30                ; Max. energy              = 30
 EQUB 23                ; Max. speed               = 23

 EQUB HI(SHIP_WORM_EDGES - SHIP_WORM)              ; Edges data offset (high)
 EQUB HI(SHIP_WORM_FACES - SHIP_WORM)              ; Faces data offset (high)

 EQUB 3                 ; Normals are scaled by    = 2^3 = 8
 EQUB %00001000         ; Laser power              = 1
                        ; Missiles                 = 0

.SHIP_WORM_VERTICES

      ;    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX   10,  -10,   35,     2,      0,    7,     7,         31    ; Vertex 0
 VERTEX  -10,  -10,   35,     3,      0,    7,     7,         31    ; Vertex 1
 VERTEX    5,    6,   15,     1,      0,    4,     2,         31    ; Vertex 2
 VERTEX   -5,    6,   15,     1,      0,    5,     3,         31    ; Vertex 3
 VERTEX   15,  -10,   25,     4,      2,    7,     7,         31    ; Vertex 4
 VERTEX  -15,  -10,   25,     5,      3,    7,     7,         31    ; Vertex 5
 VERTEX   26,  -10,  -25,     6,      4,    7,     7,         31    ; Vertex 6
 VERTEX  -26,  -10,  -25,     6,      5,    7,     7,         31    ; Vertex 7
 VERTEX    8,   14,  -25,     4,      1,    6,     6,         31    ; Vertex 8
 VERTEX   -8,   14,  -25,     5,      1,    6,     6,         31    ; Vertex 9

.SHIP_WORM_EDGES

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

.SHIP_WORM_FACES

    ; normal_x, normal_y, normal_z, visibility
 FACE        0,       88,       70,         31    ; Face 0
 FACE        0,       69,       14,         31    ; Face 1
 FACE       70,       66,       35,         31    ; Face 2
 FACE      -70,       66,       35,         31    ; Face 3
 FACE       64,       49,       14,         31    ; Face 4
 FACE      -64,       49,       14,         31    ; Face 5
 FACE        0,        0,     -200,         31    ; Face 6
 FACE        0,      -80,        0,         31    ; Face 7

[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_WORM (category: Drawing ships)

Ship blueprint for a Worm

[X]

Label SHIP_WORM_EDGES is local to this routine

[X]

Label SHIP_WORM_FACES is local to this routine

[X]

Macro VERTEX (category: Drawing ships)

Macro definition for adding vertices to ship blueprints

Drawing ships: SHIP_WORM

[NES version, Bank 1]