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/* 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__ */
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