1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
#include "balls.h"
static double clamp(double v, double lo, double hi);
static double min(double a, double b);
static double max(double a, double b);
void
collideWall(Ball *b, Rectangle wall) {
wall = insetRect(wall, b->r);
if (b->p.x < wall.min.x || b->p.x > wall.max.x) {
b->p.x = clamp(b->p.x, wall.min.x, wall.max.x);
b->v.x = -b->v.x;
}
if (b->p.y < wall.min.y || b->p.y > wall.max.y) {
b->p.y = clamp(b->p.y, wall.min.y, wall.max.y);
b->v.y = -b->v.y;
}
}
static double
clamp(double v, double lo, double hi) {
return min(hi, max(v, lo));
}
static double
min(double a, double b) {
return (a < b) ? a : b;
}
static double
max(double a, double b) {
return (a > b) ? a : b;
}
|