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wmr_model.py
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import cv2
import numpy as np
def _rot_pos(x, y, phi_):
phi = np.deg2rad(phi_)
return np.array((x*np.cos(phi)+y*np.sin(phi), -x*np.sin(phi)+y*np.cos(phi)))
def _draw_rectangle(img, x, y, u, v, phi, color=(0, 0, 0), size=1):
pts1 = _rot_pos(-u/2, -v/2, phi) + np.array((x, y))
pts2 = _rot_pos(u/2, -v/2, phi) + np.array((x, y))
pts3 = _rot_pos(-u/2, v/2, phi) + np.array((x, y))
pts4 = _rot_pos(u/2, v/2, phi) + np.array((x, y))
cv2.line(img, tuple(pts1.astype(np.int).tolist()),
tuple(pts2.astype(np.int).tolist()), color, size)
cv2.line(img, tuple(pts1.astype(np.int).tolist()),
tuple(pts3.astype(np.int).tolist()), color, size)
cv2.line(img, tuple(pts3.astype(np.int).tolist()),
tuple(pts4.astype(np.int).tolist()), color, size)
cv2.line(img, tuple(pts2.astype(np.int).tolist()),
tuple(pts4.astype(np.int).tolist()), color, size)
return img
class KinematicModel:
def __init__(self,
v_range=50,
w_range=45,
a_range=5,
# Wheel Distance
d=14,
# Wheel Size
wu=10,
wv=4,
# Car Size
car_w=24,
car_f=20,
car_r=10,
dt=0.1
):
# Rear Wheel as Origin Point
# Initialize State
self.init_state((0, 0, 0))
# ============ Car Parameter ============
# Control Constrain
self.a_range = a_range
self.v_range = v_range
self.w_range = w_range
# Wheel Distance
self.d = d
# Wheel size
self.wu = wu
self.wv = wv
# Car size
self.car_w = car_w
self.car_f = car_f
self.car_r = car_r
self._compute_car_box()
# Simulation delta time
self.dt = dt
def init_state(self, pos):
self.x = pos[0]
self.y = pos[1]
self.yaw = pos[2]
self.v = 0
self.a = 0
self.w = 0
self.record = []
def update(self):
self.v += self.a * self.dt
# Control Constrain
# Speed Constrain
if self.v > self.v_range:
self.v = self.v_range
elif self.v < -self.v_range:
self.v = -self.v_range
#####################################################################
# You need to calculate basic Kinematic Model state here.(x, y, yaw)
#####################################################################
self.x += self.v * np.cos(np.deg2rad(self.yaw)) * self.dt
self.y += self.v * np.sin(np.deg2rad(self.yaw)) * self.dt
self.yaw += self.w * self.dt
self.yaw = self.yaw % 360
self.record.append((self.x, self.y, self.yaw))
self._compute_car_box()
def control(self, a, w):
self.a = a
self.w = w
# Control Constrain
if self.a > self.a_range:
self.a = self.a_range
elif self.a < -self.a_range:
self.a = -self.a_range
if self.w > self.w_range:
self.w = self.w_range
elif self.w < -self.w_range:
self.w = -self.w_range
def state_str(self):
return "x={:.4f}, y={:.4f}, v={:.4f}, a={:.4f}, yaw={:.4f}, w={:.4f}".format(self.x, self.y, self.v, self.a, self.yaw, self.w)
def _compute_car_box(self):
pts1 = _rot_pos(self.car_f, self.car_w/2, -self.yaw) + \
np.array((self.x, self.y))
pts2 = _rot_pos(self.car_f, -self.car_w/2, -self.yaw) + \
np.array((self.x, self.y))
pts3 = _rot_pos(-self.car_r, self.car_w/2, -self.yaw) + \
np.array((self.x, self.y))
pts4 = _rot_pos(-self.car_r, -self.car_w/2, -
self.yaw) + np.array((self.x, self.y))
self.car_box = (pts1.astype(int), pts2.astype(int),
pts3.astype(int), pts4.astype(int))
def render(self, img=np.ones((600, 600, 3))):
########## Draw History ##########
rec_max = 1000
start = 0 if len(self.record) < rec_max else len(self.record)-rec_max
# Draw Trajectory
color = (0/255, 97/255, 255/255)
for i in range(start, len(self.record)-1):
cv2.line(img, (int(self.record[i][0]), int(self.record[i][1])), (int(
self.record[i+1][0]), int(self.record[i+1][1])), color, 1)
########## Draw Car ##########
# Car box
pts1, pts2, pts3, pts4 = self.car_box
color = (0, 0, 0)
size = 1
cv2.line(img, tuple(pts1.astype(np.int).tolist()),
tuple(pts2.astype(np.int).tolist()), color, size)
cv2.line(img, tuple(pts1.astype(np.int).tolist()),
tuple(pts3.astype(np.int).tolist()), color, size)
cv2.line(img, tuple(pts3.astype(np.int).tolist()),
tuple(pts4.astype(np.int).tolist()), color, size)
cv2.line(img, tuple(pts2.astype(np.int).tolist()),
tuple(pts4.astype(np.int).tolist()), color, size)
# Car center & direction
t1 = _rot_pos(6, 0, -self.yaw) + np.array((self.x, self.y))
t2 = _rot_pos(0, 4, -self.yaw) + np.array((self.x, self.y))
t3 = _rot_pos(0, -4, -self.yaw) + np.array((self.x, self.y))
cv2.line(img, (int(self.x), int(self.y)),
(int(t1[0]), int(t1[1])), (0, 0, 1), 2)
cv2.line(img, (int(t2[0]), int(t2[1])),
(int(t3[0]), int(t3[1])), (1, 0, 0), 2)
########## Draw Wheels ##########
w1 = _rot_pos(0, self.d, -self.yaw) + np.array((self.x, self.y))
w2 = _rot_pos(0, -self.d, -self.yaw) + np.array((self.x, self.y))
# 4 Wheels
img = _draw_rectangle(img, int(w1[0]), int(
w1[1]), self.wu, self.wv, -self.yaw)
img = _draw_rectangle(img, int(w2[0]), int(
w2[1]), self.wu, self.wv, -self.yaw)
# Axle
img = cv2.line(img, tuple(w1.astype(np.int).tolist()),
tuple(w2.astype(np.int).tolist()), (0, 0, 0), 1)
return img
# ================= main =================
if __name__ == "__main__":
car = KinematicModel()
car.init_state((300, 300, 0))
while(True):
print("\rx={}, y={}, v={}, yaw={}, w={}".format(str(car.x)[:5], str(car.y)[
:5], str(car.v)[:5], str(car.yaw)[:5], str(car.w)[:5]), end="\t")
img = np.ones((600, 600, 3))
car.update()
img = car.render(img)
img = cv2.flip(img, 0)
cv2.imshow("demo", img)
k = cv2.waitKey(1)
if k == ord("a"):
car.w += 5
elif k == ord("d"):
car.w -= 5
elif k == ord("w"):
car.v += 4
elif k == ord("s"):
car.v -= 4
elif k == 27:
print()
break