原文链接
#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
@author: niu
@software: PyCharm
@file: easing.py
@time: 2019/03/16 13:15
"""
import numpy as np
def ease_out_quad(x):
return 1 - (1 - x) * (1 - x)
def ease_out_quart(x):
return 1 - pow(1 - x, 4)
def ease_out_expo(x):
if x == 1:
return 1
else:
return 1 - pow(2, -10 * x)
def get_tracks(distance, seconds, ease_func='ease_out_expo'):
'''
:param distance: 距离
:param seconds: 调节滑动速度，效果自测
:param ease_func: 固定的 'ease_out_expo'
:return:
'''
tracks = [0]
offsets = [0]
# 0.08 调节速度
for t in np.arange(0.0, seconds, 0.08):
ease = globals()[ease_func]
offset = round(ease(t / seconds) * distance)
tracks.append(offset - offsets[-1])
offsets.append(offset)
return offsets, tracks
