static VALUE
rb_cpCircleInitialize(VALUE self, VALUE body, VALUE radius, VALUE offset)
{
cpCircleShape *circle = (cpCircleShape *)SHAPE(self);
cpCircleShapeInit(circle, BODY(body), NUM2DBL(radius), *VGET(offset));
circle->shape.data = (void *)self;
circle->shape.collision_type = Qnil;
rb_ivar_set(self, id_body, body);
return self;
}
/**
* Initialize a bubble that will bounce around.
* \param b The bubble to initialize.
* \param x The x location of the bubble.
* \param y The y location of the bubble.
* \param v_x The x velocity of the bubble.
* \param v_y The y velocity of the bubble.
* \param r The radius of the bubble.
* \param l The bubble's life.
*/
struct bubble *bubble_init(struct bubble *b, double x, double y, double v_x,
double v_y, double r, uint8_t l) {
cpBody *body = cpBodyInit(&b->body, r,
cpMomentForCircle(r, 0, r, cpv(0, 0)));
if (!body) {
ERR_ERRNO();
return 0;
}
cpShape *shape = cpCircleShapeInit(&b->shape, body, r, cpv(0,0));
if (!shape) {
cpBodyDestroy(body);
ERR_ERRNO();
return 0;
}
cpBodySetVel(body, cpv(v_x, v_y));
cpBodySetPos(body, cpv(x, y));
shape->e = 1.0;
shape->data = b;
shape->collision_type = BUBBLE;
b->l = l;
return b;
}
cpShape *
cpCircleShapeNew(cpBody *body, cpFloat radius, cpVect offset)
{
return (cpShape *)cpCircleShapeInit(cpCircleShapeAlloc(), body, radius, offset);
}
// From cpShape.h
void wrCircleShapeInit(cpCircleShape *circle, cpBody *body,
cpVect *offset, cpFloat radius) {
cpCircleShapeInit(circle, body, radius, *offset);
}