Revision 1026
working ray-polygon collisions, but needs a lot of clean up
world.c | ||
---|---|---|
7 | 7 |
**/ |
8 | 8 |
|
9 | 9 |
#include <stdio.h> |
10 |
#include <stdlib.h> |
|
11 |
#include <math.h> |
|
12 |
#include <stdarg.h> |
|
10 | 13 |
#include "world.h" |
11 | 14 |
|
12 | 15 |
|
13 |
double collide_circle(ray_t *ray, object_t *obj){ |
|
16 |
|
|
17 |
double (*collide_func[NUM_SHAPES])(ray_t *ray, object_t *obj) = |
|
18 |
{ |
|
19 |
collide_poly |
|
20 |
}; |
|
21 |
int (*create_func[NUM_SHAPES])(object_t *obj, va_list ap) = |
|
22 |
{ |
|
23 |
create_poly |
|
24 |
}; |
|
25 |
double collide_circle(ray_t *ray, object_t *obj) |
|
26 |
{ |
|
14 | 27 |
return -1; |
15 | 28 |
} |
16 |
double collide_rect(ray_t *ray, object_t *obj){ |
|
17 |
return -2; |
|
29 |
|
|
30 |
double collide_seg(ray_t *ray, point_t p3, point_t p4) |
|
31 |
{ |
|
32 |
double denom, nume_a, nume_b, ua, ub, xint, yint, dist; |
|
33 |
point_t p1 = ray->p; |
|
34 |
point_t p2 = {ray->p.x+cos(ray->d),ray->p.y+sin(ray->d)}; |
|
35 |
|
|
36 |
// printf("(%g,%g) --> (%g,%g) with (%g,%g) --> (%g,%g)\n",p1.x,p1.y,p2.x,p2.y,p3.x,p3.y,p4.x,p4.y); |
|
37 |
denom = (p2.y-p1.y)*(p4.x-p3.x)-(p2.x-p1.x)*(p4.y-p3.y); |
|
38 |
if (denom == 0) { |
|
39 |
return RAY_MISS; |
|
40 |
} |
|
41 |
nume_a = (p2.x-p1.x)*(p3.y-p1.y)-(p2.y-p1.y)*(p3.x-p1.x); |
|
42 |
nume_b = (p4.x-p3.x)*(p3.y-p1.y)-(p4.y-p3.y)*(p3.x-p1.x); |
|
43 |
|
|
44 |
ua = nume_a/denom; |
|
45 |
if (ua < 0 || ua > 1) { |
|
46 |
return RAY_MISS; |
|
47 |
} |
|
48 |
|
|
49 |
ub = nume_b/denom; |
|
50 |
if (ub < 0) { |
|
51 |
return RAY_MISS; |
|
52 |
} |
|
53 |
|
|
54 |
xint = p3.x+ua*(p4.x-p3.x); |
|
55 |
yint = p3.y+ua*(p4.y-p3.y); |
|
56 |
dist = sqrt((xint-p1.x)*(xint-p1.x)+(yint-p1.y)*(yint-p1.y)); |
|
57 |
return dist; |
|
58 |
|
|
18 | 59 |
} |
60 |
double collide_rect(ray_t *ray, object_t *obj) {} |
|
61 |
/* |
|
62 |
{ |
|
63 |
seg_t s; |
|
64 |
double min = RAY_MISS, x; |
|
65 |
rect_t *rect = (rect_t *)obj->props; |
|
19 | 66 |
|
20 |
double collide(ray_t *ray, object_t *obj) { |
|
67 |
s.p1 = s.p2 = rect->p1; |
|
68 |
s.p2.y = rect->p2.y; |
|
69 |
if ((x = collide_seg(ray, (seg_t *)&s)) < min) |
|
70 |
min = x; |
|
71 |
|
|
72 |
s.p1 = rect->p2; |
|
73 |
if ((x = collide_seg(ray, (seg_t *)&s)) < min) |
|
74 |
min = x; |
|
75 |
|
|
76 |
s.p2 = rect->p1; |
|
77 |
s.p2.x = rect->p2.x; |
|
78 |
if ((x = collide_seg(ray, (seg_t *)&s)) < min) |
|
79 |
min = x; |
|
80 |
|
|
81 |
s.p1 = rect->p1; |
|
82 |
if ((x = collide_seg(ray, (seg_t *)&s)) < min) |
|
83 |
min = x; |
|
84 |
|
|
85 |
return min; |
|
86 |
} |
|
87 |
*/ |
|
88 |
|
|
89 |
double collide_poly(ray_t *ray, object_t *obj) |
|
90 |
{ |
|
91 |
int i; |
|
92 |
double min = RAY_MISS; |
|
93 |
double x; |
|
94 |
poly_t *p = (poly_t *) obj->props; |
|
95 |
|
|
96 |
if (obj->id != ID_POLY){ |
|
97 |
return -1; |
|
98 |
} |
|
99 |
|
|
100 |
for (i = 0; i < p->num_pts - 1; i++) { |
|
101 |
if ((x = collide_seg(ray, p->pts[i], p->pts[i+1])) < min){ |
|
102 |
min = x; |
|
103 |
} |
|
104 |
} |
|
105 |
if (p->type == POLY_DISCONNECTED) { |
|
106 |
if ((x = collide_seg(ray,p->pts[i],p->pts[0])) < min) |
|
107 |
min = x; |
|
108 |
} |
|
109 |
return min; |
|
110 |
} |
|
111 |
|
|
112 |
double collide(ray_t *ray, object_t *obj) |
|
113 |
{ |
|
21 | 114 |
if (ray == NULL || obj == NULL) |
115 |
{ |
|
22 | 116 |
return -1; |
117 |
} |
|
23 | 118 |
return collide_func[obj->id](ray, obj); |
24 | 119 |
} |
120 |
|
|
121 |
|
|
122 |
|
|
123 |
object_t *create(int id, ...) |
|
124 |
{ |
|
125 |
object_t *obj; |
|
126 |
va_list args; |
|
127 |
|
|
128 |
obj = malloc(sizeof(object_t)); |
|
129 |
obj->id = id; |
|
130 |
va_start(args, id); |
|
131 |
if (create_func[id](obj, args) < 0) { |
|
132 |
free(obj); |
|
133 |
obj = NULL; |
|
134 |
} |
|
135 |
va_end(args); |
|
136 |
return obj; |
|
137 |
} |
|
138 |
|
|
139 |
/** |
|
140 |
* |
|
141 |
**/ |
|
142 |
int create_poly(object_t *obj, va_list ap) |
|
143 |
{ |
|
144 |
int i; |
|
145 |
poly_t *p; |
|
146 |
|
|
147 |
int argc = va_arg(ap, int); |
|
148 |
int poly_type = va_arg(ap, int); |
|
149 |
|
|
150 |
p = malloc(sizeof(poly_t)); |
|
151 |
|
|
152 |
|
|
153 |
p->num_pts = argc; |
|
154 |
p->pts = malloc((argc) * sizeof(point_t)); |
|
155 |
p->type = poly_type; |
|
156 |
|
|
157 |
for(i=0;i < argc; i++) { |
|
158 |
p->pts[i].x = va_arg(ap, double); |
|
159 |
p->pts[i].y = va_arg(ap, double); |
|
160 |
} |
|
161 |
obj->id = ID_POLY; |
|
162 |
obj->bbox = NULL; |
|
163 |
obj->props = p; |
|
164 |
return 1; |
|
165 |
} |
|
166 |
|
|
167 |
int create_rect(object_t *obj, va_list ap) |
|
168 |
{ |
|
169 |
int i; |
|
170 |
poly_t *p; |
|
171 |
int argc = va_arg(ap, int); |
|
172 |
} |
|
173 |
|
|
174 |
void destroy_poly (object_t *obj) |
|
175 |
{ |
|
176 |
poly_t *p; |
|
177 |
int i; |
|
178 |
|
|
179 |
if (obj == NULL) |
|
180 |
return; |
|
181 |
p = (poly_t *)obj->props; |
|
182 |
if (p != NULL) free(p->pts); |
|
183 |
free(p); |
|
184 |
free(obj); |
|
185 |
|
|
186 |
for (i = 0; i < p->num_pts; i++) |
|
187 |
{ |
|
188 |
} |
|
189 |
|
|
190 |
|
|
191 |
|
|
192 |
|
|
193 |
} |
|
194 |
|
|
195 |
void print_object(object_t *obj) |
|
196 |
{ |
|
197 |
if (obj == NULL) { |
|
198 |
printf("No object\n"); |
|
199 |
return; |
|
200 |
} |
|
201 |
int i; |
|
202 |
poly_t *p; |
|
203 |
switch (obj->id) { |
|
204 |
case ID_POLY: |
|
205 |
p = (poly_t *) obj->props; |
|
206 |
printf("POLYGON (%d points, %s) { ", p->num_pts, p->type?"connected" : "disconnected"); |
|
207 |
for (i = 0; i < p->num_pts; i++){ |
|
208 |
printf("(%g, %g) ", p->pts[i].x, p->pts[i].y); |
|
209 |
} |
|
210 |
printf("}\n"); |
|
211 |
break; |
|
212 |
default: |
|
213 |
break; |
|
214 |
|
|
215 |
} |
|
216 |
} |
|
217 |
|
|
218 |
|
Also available in: Unified diff