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1 | /* penrose.h |
2 | * |
3 | * Penrose tiling functions. |
4 | * |
5 | * Provides an interface with which to generate Penrose tilings |
6 | * by recursive subdivision of an initial tile of choice (one of the |
7 | * four sets of two pairs kite/dart, or thin/thick rhombus). |
8 | * |
9 | * You supply a callback function and a context pointer, which is |
10 | * called with each tile in turn: you choose how many times to recurse. |
11 | */ |
12 | |
13 | #ifndef _PENROSE_H |
14 | #define _PENROSE_H |
15 | |
16 | #ifndef PHI |
17 | #define PHI 1.6180339887 |
18 | #endif |
19 | |
20 | typedef struct vector vector; |
21 | |
22 | double v_x(vector *vs, int i); |
23 | double v_y(vector *vs, int i); |
24 | |
25 | typedef struct penrose_state penrose_state; |
26 | |
27 | /* Return non-zero to clip the tree here (i.e. not recurse |
28 | * below this tile). |
29 | * |
30 | * Parameters are state, vector array, npoints, depth. |
31 | * ctx is inside state. |
32 | */ |
33 | typedef int (*tile_callback)(penrose_state *, vector *, int, int); |
34 | |
35 | struct penrose_state { |
36 | int start_size; /* initial side length */ |
37 | int max_depth; /* Recursion depth */ |
38 | |
39 | tile_callback new_tile; |
40 | void *ctx; /* for callback */ |
41 | }; |
42 | |
43 | enum { PENROSE_P2, PENROSE_P3 }; |
44 | |
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45 | extern int penrose(penrose_state *state, int which, int angle); |
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46 | |
47 | /* Returns the side-length of a penrose tile at recursion level |
48 | * gen, given a starting side length. */ |
49 | extern double penrose_side_length(double start_size, int depth); |
50 | |
51 | /* Returns the count of each type of tile at a given recursion depth. */ |
52 | extern void penrose_count_tiles(int gen, int *nlarge, int *nsmall); |
53 | |
54 | /* Calculate start size and recursion depth required to produce a |
55 | * width-by-height sized patch of penrose tiles with the given tilesize */ |
56 | extern void penrose_calculate_size(int which, int tilesize, int w, int h, |
57 | double *required_radius, int *start_size, int *depth); |
58 | |
59 | #endif |