Smooth motion in pyglet should always take place inside an event loop
specified by an interval scheduled function. On_draw will never fire in the
middle of that loop unless you have code in the loop that tells it to.
Since your loop function must accept a dt parameter, you can ensure your
motion is correctly interpolated. For example:
import pyglet
window = pyglet.window.Window(800, 800)
mypic = pyglet.resource.image('mypic.jpg')
sprite = pyglet.sprite.Sprite(mypic, x=0, y=0, subpixel=True)
def move_sprite(dt):
sprite.x += 50*dt
@window.event
def on_draw():
window.clear()
sprite.draw()
pyglet.clock.schedule_interval(move_sprite, 1.0/60)
pyglet.app.run()
In this code, on_draw() will be called every time pyglet's clock has
completed move_sprite. If the interval isn't exactly one sixtieth of a
second it doesn't matter, the clock will pass the dt of when it actually
firs, not when it was scehduled.
On Wednesday, October 26, 2016 at 2:19:47 PM UTC-5, Baitshop wrote:
>
> I was wondering if a fixed timestep is possible with pyglet's current
> event loop? When using schedule_interval for 1/60.0 it's not always
> consistent since it is using a variable time step.
>
> How is one supposed to separate the rendering from the updates considering
> adjusting the position of the sprite will move it next time it is drawn. I
> am also having trouble understanding how interpolation would be configured
> using the pyglet app system as the on_draw does not get passed any dt. I
> have tried an older implementation that I found, but it seems like it fires
> the scheduled function faster than the dt actually is. Would anyone happen
> to have a proper example of how a fixed time step would work using a sprite
> and pyglet?
>
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