def __init__(self, id, config):
self.logger = logging.getLogger(Config.LOGGING_NAME+".Hexapod.Legs.Leg{}".format(id))
self.id = id
self.globalConfig = config
self.config = self.globalConfig["leg{}Config".format(id)]
#FK/IK information
self._position = Position3D(self.config["position"])
self.globalAngle = self.config["homeAngle"]
self.coxa = Joint("leg{}Coxa".format(self.id), self.config)
self.coxa.setAngleChangedCallback(self.forwardKinematics)
self.coxaHead = self.position
self.coxaTail = None
self.femur = Joint("leg{}Femur".format(self.id), self.config)
self.femur.setAngleChangedCallback(self.forwardKinematics)
self.femurHead = None
self.femurTail = None
self.tibia = Joint("leg{}Tibia".format(self.id), self.config)
self.tibia.setAngleChangedCallback(self.forwardKinematics)
self.tibiaHead = None
self.tibiaTail = None
self.footPosition = None
###
self.forwardKinematics()
self.homePosition = self.tibiaTail
self.relativeTibiaHome = self.coxaHead.getDifference(self.tibiaTail)
if "legSpeed" in self.globalConfig:
self.speed = self.globalConfig["legSpeed"]
elif "legSpeed" in self.config:
self.speed = self.config["legSpeed"]
else:
self.speed = 90
self.setSpeed(self.speed)
class Leg:
def __init__(self, id, config):
self.logger = logging.getLogger(Config.LOGGING_NAME+".Hexapod.Legs.Leg{}".format(id))
self.id = id
self.globalConfig = config
self.config = self.globalConfig["leg{}Config".format(id)]
#FK/IK information
self._position = Position3D(self.config["position"])
self.globalAngle = self.config["homeAngle"]
self.coxa = Joint("leg{}Coxa".format(self.id), self.config)
self.coxa.setAngleChangedCallback(self.forwardKinematics)
self.coxaHead = self.position
self.coxaTail = None
self.femur = Joint("leg{}Femur".format(self.id), self.config)
self.femur.setAngleChangedCallback(self.forwardKinematics)
self.femurHead = None
self.femurTail = None
self.tibia = Joint("leg{}Tibia".format(self.id), self.config)
self.tibia.setAngleChangedCallback(self.forwardKinematics)
self.tibiaHead = None
self.tibiaTail = None
self.footPosition = None
###
self.forwardKinematics()
self.homePosition = self.tibiaTail
self.relativeTibiaHome = self.coxaHead.getDifference(self.tibiaTail)
if "legSpeed" in self.globalConfig:
self.speed = self.globalConfig["legSpeed"]
elif "legSpeed" in self.config:
self.speed = self.config["legSpeed"]
else:
self.speed = 90
self.setSpeed(self.speed)
def updateOffsets(self):
self.coxa.setOffset()
self.femur.setOffset()
self.tibia.setOffset()
def moveBody(self, position):
footPosition = self.footPosition
self.setPosition(self.position.addPosition(position))
self.setFootPosition(footPosition)
#Sets the coxa head position. Uses decorators to detect changes in the position property.
def setPosition(self, position):
self._position = position
self.forwardKinematics()
@property
def position(self):
return self._position
@position.setter
def position(self, position):
self.setPosition(position)
"""
Calculates the position of each end of each bone based upon the current joint angles
This function is called after any change to the leg position, joint angle changes, etc
"""
def forwardKinematics(self):
self.coxaHead = self._position
self.femurHead = self.position.sphericalToCartesian((self.coxa.getAngle()*self.config["coxaInversion"])+self.globalAngle, 0, self.globalConfig["legConfig"]["coxaLength"])
self.femurHead = self.femurHead.addPosition(Position3D(0, 0, self.config["femurZOffset"]))
self.coxaTail = self.femurHead
self.tibiaHead = self.femurHead.sphericalToCartesian((self.coxa.getAngle()*self.config["coxaInversion"])+self.globalAngle, self.femur.getAngle(), self.globalConfig["legConfig"]["femurLength"])
self.femurTail = self.tibiaHead
self.tibiaTail = self.tibiaHead.sphericalToCartesian((self.coxa.getAngle()*self.config["coxaInversion"])+self.globalAngle, (self.femur.angle+self.tibia.angle)-90, self.globalConfig["legConfig"]["tibiaLength"])
self.footPosition = self.tibiaTail
"""
Moves the robot's leg relative to it's current position
"""
def translate(self, x, y, z):
pos = Position3D(self.footPosition.x+x, self.footPosition.y+y, self.footPosition.z+z)
self.setFootPosition(pos)
"""
Turns the leg on
"""
def turnOn(self):
self.coxa.turnOn()
self.femur.turnOn()
self.tibia.turnOn()
"""
Turns the leg off
"""
def turnOff(self):
self.coxa.turnOff()
self.femur.turnOff()
self.tibia.turnOff()
"""
Speed is expressed in degrees/second
"""
def setSpeed(self, speed):
self.speed = speed
self.coxa.setSpeed(self.speed)
self.femur.setSpeed(self.speed)
self.tibia.setSpeed(self.speed)
def move(self, x, y, z):
self.setFootPosition(Position3D(x, y, z))
"""
Does fancy IK stuff to calculate foot angles and stuff.
Position is a Position3D class
"""
def setFootPosition(self, position):
try:
x = position.x
y = position.y
z = position.z
position = Position3D(x, y, z)
coxa = Position2D(self.coxaHead.x, self.coxaHead.y)
target = Position2D(position.x, position.y)
L1 = coxa.getDistance(target)
diff = coxa.getDifference(target)
try:
g = math.degrees(math.atan(diff[0]/diff[1]))
except ZeroDivisionError:
print("Div/0")
g = 90#math.degrees(math.atan(0.0))
g = (180-abs(g))-90
if (self.position.y-diff[1]) < (self.position.y+self.relativeTibiaHome[1]):# and self.id not in [3, 4]:
g = g * -1
head = Position2D(self.femurHead.x, self.femurHead.z)
target = Position2D(position.x, position.z)
L = math.sqrt(head.getDifference(target)[1]**2+(L1-self.globalConfig["legConfig"]["coxaLength"])**2)
a1 = math.degrees(math.acos((head.getTuple()[1]-target.getTuple()[1])/L))
a2 = math.degrees(math.acos(((self.globalConfig["legConfig"]["tibiaLength"]**2)-(self.globalConfig["legConfig"]["femurLength"]**2)-(L**2))/(-2 * self.globalConfig["legConfig"]["femurLength"] * L)))
a = a1 + a2
b = math.degrees(math.acos(((L**2) - (self.globalConfig["legConfig"]["tibiaLength"]**2) - (self.globalConfig["legConfig"]["femurLength"]**2))/(-2*self.globalConfig["legConfig"]["tibiaLength"]*self.globalConfig["legConfig"]["femurLength"])))
a = a - 90
b = (b-180)+90
g = self.config["coxaAngleOffset"]-g
speeds = []
speeds.append(self.femur.getAngleSetTime(a))
speeds.append(self.tibia.getAngleSetTime(b))
speeds.append(self.coxa.getAngleSetTime(g))
time = max(speeds)
self.femur.setAngle(a, time=time)
self.tibia.setAngle(b, time=time)
self.coxa.setAngle(g, time=time)
return time
except ZeroDivisionError:
print("Div by 0 stuff. Do nothing")
