Mirai's Miscellaneous Misadventures
M49 / core / motion.c
#include <mimimi.h>
void mimimi_linear_propagate(struct mimimi_momentum *momentum, int value, int x0, int scale)
{
momentum->dx += (value - x0) * 256 / scale - momentum->x;
}
void mimimi_linear_apply(struct mimimi_momentum *momentum, int *value, int x0, int scale)
{
*value = momentum->x * scale / 256 + x0;
}
void mimimi_angular_propagate(struct mimimi_momentum *momentum, struct mimimi_position *position, int x0, int y0, int a0, int scale)
{
int a, x, y, dx;
x = position->x - x0;
y = position->y - y0;
a = mimimi_angle(x, y);
dx = (a / 64 - a0) - momentum->x * scale / 256;
dx = mimimi_mod(dx, 256);
if (dx > 128) dx = dx - 256;
momentum->dx += dx * 256 / scale;
}
void mimimi_angular_apply(struct mimimi_momentum *momentum, struct mimimi_position *position, int x0, int y0, int a0, int scale, int length)
{
int a, x, y;
a = mimimi_mod(momentum->x * scale / 256 + a0, 256);
x = mimimi_sine[a] * length / 128;
y = mimimi_cosine[a] * length / 128;
position->x = x + x0;
position->y = y + y0;
}
static void mimimi_linear_motion_propagate(void *data)
{
struct mimimi_linear_motion *motion;
motion = data;
mimimi_linear_propagate(motion->motion.momentum, *motion->value, motion->origin, motion->scale);
}
static void mimimi_linear_motion_apply(void *data)
{
struct mimimi_linear_motion *motion;
motion = data;
mimimi_linear_apply(motion->motion.momentum, motion->value, motion->origin, motion->scale);
}
void mimimi_linear_motion(struct mimimi_linear_motion *motion, struct mimimi_momentum *momentum, int *value, int origin, int scale)
{
motion->value = value;
motion->origin = origin;
motion->scale = scale;
motion->motion.data = motion;
motion->motion.momentum = momentum;
motion->motion.propagate = &mimimi_linear_motion_propagate;
motion->motion.apply = &mimimi_linear_motion_apply;
}
static void mimimi_angular_motion_propagate(void *data)
{
struct mimimi_angular_motion *motion;
motion = data;
mimimi_angular_propagate(motion->motion.momentum, motion->value, motion->origin.x, motion->origin.y, motion->angle, motion->scale);
}
static void mimimi_angular_motion_apply(void *data)
{
struct mimimi_angular_motion *motion;
motion = data;
mimimi_angular_apply(motion->motion.momentum, motion->value, motion->origin.x, motion->origin.y, motion->angle, motion->scale, motion->height);
}
void mimimi_angular_motion(struct mimimi_angular_motion *motion, struct mimimi_momentum *momentum, struct mimimi_position *value, int x0, int y0, int a0, int scale, int height)
{
motion->value = value;
motion->origin.x = x0;
motion->origin.y = y0;
motion->angle = a0;
motion->scale = scale;
motion->height = height;
motion->motion.data = motion;
motion->motion.momentum = momentum;
motion->motion.propagate = &mimimi_angular_motion_propagate;
motion->motion.apply = &mimimi_angular_motion_apply;
}