Getting the data for the finger bending and closing in Python[HELPP]

[mryosoo]

Hello guys!, I've been studying the python language for developing applications in windows. I am having trouble in finding the data in finger angles, between the fingers and palm(finger bending). Please can somebody help me. Any help would be much appreciated.

[Joe_Ward]

First you get direction vectors representing the two things whose angle you want to measure, then call the Vector.angle_to() function. For example, the api provides a hand direction vector representing the forward direction of the hand and a finger direction vector representing the direction of finger. For example, you could do:

import Leap;
controller = Leap.Controller()
frame = controller.frame()
hand = frame.hands.frontmost
if hand.is_valid:
   finger = hand.fingers.frontmost
   radian_angle = hand.direction.angle_to(finger.direction)
else:
    print "No hand in view."

[mryosoo]

Hi Joe!, thanks for the head start. Things are getting good, till i stuck here with my code. Here:

frame = controller.frame()
for hand in frame.hands:
    #finger object
    hand = frame.hands.frontmost
    for finger in hand.fingers:
	bone = finger.bone(1) #Index finger
	#Distal and Metacarpal
	distal_bone = bone.TYPE_DISTAL
	meta_bone = bone.TYPE_METACARPAL
	dot_product = distal_bone.direction.dot(meta_bone.direction)

Can u tell what im missing here?, It says that the distal and metacarpal bone had no directions to call. *sigh

[Joe_Ward]

bone.TYPE_DISTAL is not a Bone object, it is a constant defining the number designator of the bone. (Also, finger.bone(1)doesn't give you the index finger.) You would want:

for finger in hand.fingers:
    #Distal and Metacarpal
    distal_bone = finger.bone(Leap.Bone.TYPE_DISTAL)
    meta_bone = finger.bone(Leap.Bone.TYPE_METACARPAL)
    dot_product = distal_bone.direction.dot(meta_bone.direction)

[mryosoo]

Hi again Joe, Thank you for the support and attention, i was able to complete my code with your help.

And i also found out how to properly indicate the index finger.

hand = frame.hands.frontmost	
index_finger_list = hand.fingers.finger_type(Leap.Finger.TYPE_INDEX)
index_finger = index_finger_list[0] # since there is only one per hand
for finger in hand.fingers:
    #Distal and Metacarpal
    index_distal_bone = index_finger.bone(Leap.Bone.TYPE_DISTAL)
	index_meta_bone = index_finger.bone(Leap.Bone.TYPE_METACARPAL)
	index_dot_product = index_distal_bone.direction.dot(index_meta_bone.direction)

[Joe_Ward]

Of course, you don't need the for loop in this case:

hand = frame.hands.frontmost	
index_finger_list = hand.fingers.finger_type(Leap.Finger.TYPE_INDEX)
index_finger = index_finger_list[0] # since there is only one per hand
#Distal and Metacarpal
index_distal_bone = index_finger.bone(Leap.Bone.TYPE_DISTAL)
index_meta_bone = index_finger.bone(Leap.Bone.TYPE_METACARPAL)
index_dot_product = index_distal_bone.direction.dot(index_meta_bone.direction)