This repository provides easing functions implemented in Python.
I decided to try creative coding with Python and Panda3D, and first created the modules that provide these easing functions as a means to smoothly move animation.
For a demonstration, please see ParticleText.
- Panda3D 1.10.15
- numpy 2.2.4
- Python 3.12
- Windows11
tween = Tween(start, end, duration, delay=0, yoyo=False, easing_type='linear')
start and end can be specified as a scalar, numpy.ndarray, panda3d.core.Point2, Point3, Vec2, Vec3 and so on.
-
start: float
- The start point of the animation.
-
end: float
- The end point of the animation.
-
duration: int
- The time that an animation takes to complete. Specify in seconds.
-
delay: float
- Start delay time.
-
yoyo: bool
- If True, go to the end point and come back. If False, just go to the end point. The default is False.
-
easing_type: string
- The function name defined in the Ease class. The default is linear.
After instantiating the Tween class, call the start method. The instance variable is_playing is set to True when the animation starts and changes to False when it ends, and the next move position of the 3D model, etc. is stored in the instance variable next_pos after the update method is called.
from panda3d.core import Point3
from pytweener.tween import Tween
tween = Tween(Point3(0.5, 0.5, 0.5), Point3(3.5, 1.5, 3.5), 2.0, delay=0, yoyo=True, easing_type='in_out_expo')
tween.start()
while True:
if tween.is_playing:
tween.update()
print(tween.next_pos)
else:
break
# If the number of repeats is not specified, it loops infinitely.
tween.loop()
# The number of repeats is specified as follows.
#tween.loop(repeats=3)
tween.pause()
tween.resume()
tween.finish()
The easing functions are based on below.