Created
September 2, 2012 02:58
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Blender test script that swaps pairs of selected keyframe points.
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import bpy | |
from pdb import set_trace | |
# quick handy little lambdas | |
first = lambda l : l[0] | |
last = lambda l : l[-1] | |
def chunks(lst, n): | |
for i in range(0, len(lst), n): | |
yield lst[i:i+n] | |
def swap_ys(p1, p2): | |
p1.co.y, p2.co.y = p2.co.y, p1.co.y | |
ob = bpy.context.object | |
fcurves = ob.animation_data.action.fcurves | |
fcrv = last([c for c in fcurves if c.select]) | |
kps = fcrv.keyframe_points | |
kps = [kp for kp in kps if kp.select_control_point] | |
kps_pairs = list(chunks(kps, 2)) | |
kps_pairs = filter(lambda l: len(l)>1, kps_pairs) | |
def swap_pair(pair): | |
def get_handle_diff(pt): | |
left_diff = pt.handle_left.y - pt.co.y | |
right_diff = pt.handle_right.y - pt.co.y | |
return left_diff, right_diff | |
# get the handle relative diff in advance before swapping | |
left_diff_0, right_diff_0 = get_handle_diff(pair[0]) | |
left_diff_1, right_diff_1 = get_handle_diff(pair[1]) | |
# do the coordinate swap | |
y1, y2 = pair[0].co.y, pair[1].co.y | |
pair[0].co.y, pair[1].co.y = y2, y1 | |
# update the handles | |
pair[0].handle_left.y = pair[0].co.y + left_diff_0 | |
pair[0].handle_right.y = pair[0].co.y + right_diff_0 | |
pair[1].handle_left.y = pair[1].co.y + left_diff_1 | |
pair[1].handle_right.y = pair[1].co.y + right_diff_1 | |
for pair in kps_pairs: | |
swap_pair(pair) | |
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