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Diffstat (limited to 'hacks/glx/involute.h')
| -rw-r--r-- | hacks/glx/involute.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/hacks/glx/involute.h b/hacks/glx/involute.h new file mode 100644 index 0000000..c6a3066 --- /dev/null +++ b/hacks/glx/involute.h @@ -0,0 +1,78 @@ +/* involute, Copyright (c) 2004-2014 Jamie Zawinski <jwz@jwz.org> + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that + * copyright notice and this permission notice appear in supporting + * documentation. No representations are made about the suitability of this + * software for any purpose. It is provided "as is" without express or + * implied warranty. + * + * Utilities for rendering OpenGL gears with involute teeth. + */ + +#ifndef __GEAR_INVOLUTE_H__ +#define __GEAR_INVOLUTE_H__ + +typedef struct { + unsigned long id; /* unique name */ + double x, y, z; /* position */ + double r; /* radius of the gear, at middle of teeth */ + double th; /* rotation (degrees) */ + + GLint nteeth; /* how many teeth */ + double tooth_w, tooth_h; /* size of teeth */ + + double tooth_slope; /* 0 for normal right-angle gear; 1 = 45 deg. */ + double inner_r; /* radius of the (larger) inside hole */ + double inner_r2; /* radius of the (smaller) inside hole, if any */ + double inner_r3; /* yet another */ + + double thickness; /* height of the edge */ + double thickness2; /* height of the (smaller) inside disc if any */ + double thickness3; /* yet another */ + int spokes; /* how many spokes inside, if any */ + int nubs; /* how many little nubbly bits, if any */ + double spoke_thickness; /* spoke versus hole */ + double wobble; /* factory defect! */ + int motion_blur_p; /* whether it's spinning too fast to draw */ + int polygons; /* how many polys in this gear */ + + double ratio; /* gearing ratio with previous gears */ + double rpm; /* approximate revolutions per minute */ + + Bool inverted_p; /* whether this gear has teeth on the inside */ + Bool base_p; /* whether this gear begins a new train */ + int coax_p; /* whether this is one of a pair of bound gears. + 1 for first, 2 for second. */ + double coax_displacement; /* distance between gear planes */ + + double coax_thickness; /* thickness of the other gear in the pair */ + + enum { INVOLUTE_SMALL, + INVOLUTE_MEDIUM, + INVOLUTE_LARGE, + INVOLUTE_HUGE } size; /* Controls complexity of mesh. */ + GLfloat color[4]; + GLfloat color2[4]; + + GLuint dlist; +} gear; + +/* Render one gear, unrotated at 0,0. + Returns the number of polygons. + */ +extern int draw_involute_gear (gear *g, Bool wire_p); + +/* Draws a much simpler representation of a gear. + Returns the number of polygons. + */ +extern int draw_involute_schematic (gear *g, Bool wire_p); + +/* Which of the gear's inside rings is the biggest? + */ +extern int involute_biggest_ring (gear *g, + double *posP, double *sizeP, + double *heightP); + +#endif /* __GEAR_INVOLUTE_H__ */ |