Sprite animation from sprite sheet at 8 FPS?

Vile

@JonB, I’ve also never used Action.wait before, so I’d appreciate an example of this, thanks.

Remember, I’m still a noob here lol

pulbrich

import time #this module is needed to get the system time

In your set-up code:

self.last_update = time.process_time()

In your update method:

current_time = time.process_time()
if current_time - self.last_update > 0.125:
	self.last_update = current_time
	modify_the_sprite

Vile

@pulbrich

I tried your method, but it seems that anything I put into the update function doesn’t get used...

Here’s the updated code:

from scene import *
import time

sprite_sheet = [
Texture('IMG_0227.png').subtexture(Rect(0,0,0.25,1)),
Texture('IMG_0227.png').subtexture(Rect(0.25,0,0.25,1)),
Texture('IMG_0227.png').subtexture(Rect(0.5,0,0.25,1)),
Texture('IMG_0227.png').subtexture(Rect(0.75,0,.25,1)),
]

class MyScene (Scene):
	def setup(self):
		self.screen="game"
		self.background_color = 'black'
		self.last_update = time.process_time()
		self.sprite = SpriteNode(sprite_sheet[0],
		scale = 1,
		position = self.size / 2,
		parent = self)
		self.add_child(self.sprite)
		n=0
		
		def update(self):
			current_time = time.process_time()
			if current_time - self.last_update > 0.125:
				self.last_update = current_time
				#modify_the_sprite
				self.sprite.texture=sprite_sheet[n]
				n=n+1
run(MyScene())

Vile

Wait it actually works, I just had the wrong indentation on the update function XD

Here’s the code:

from scene import *
import time

sprite_sheet = [
Texture('IMG_0227.png').subtexture(Rect(0,0,0.25,1)),
Texture('IMG_0227.png').subtexture(Rect(0.25,0,0.25,1)),
Texture('IMG_0227.png').subtexture(Rect(0.5,0,0.25,1)),
Texture('IMG_0227.png').subtexture(Rect(0.75,0,.25,1)),
]

class MyScene (Scene):
	def setup(self):
		self.screen="game"
		self.background_color = 'black'
		self.last_update = time.process_time()
		self.sprite = SpriteNode(sprite_sheet[0],
		scale = 1,
		position = self.size / 2,
		parent = self)
		self.add_child(self.sprite)
		self.n=0
		
	def update(self):
		#self.sprite.texture=sprite_sheet[1]
		current_time = time.process_time()
		if current_time - self.last_update > 0.05:
			self.last_update = current_time
			#modify_the_sprite
			self.sprite.texture=sprite_sheet[self.n]
			self.n=self.n+1
			if self.n > 3:
				self.n=0
run(MyScene())

Thanks a lot for your help!

JonB

dont use time.process_time. instead use scene.t -- scene includes t which is the time since the start of the scene, and dt, which is the time since last update.

Vile

@JonB, I tried using scene.t and scene.dt, but I can’t get it working...

pulbrich

Instead of using the time function that I suggested, put Scene.t (mind the capital S)

CORRECTION: it is self.t (instance attribute), thanks @JonB

self.dt is not directly suitable for your case; it gives you the time lapsed since the last call to update().

JonB

I think it should be self.t.
it is an instance attribute, not a class attrib, if memory serves -- the time is incremented in the running scene only.

cvp

Following @JonB advice, this works

.
.
.
        self.last_t = self.t
        
    def update(self):
        #self.sprite.texture=sprite_sheet[1]
        if (self.t-self.last_t) > 0.05:
            #modify_the_sprite
            self.last_t = self.t
.
.
.

Vile

@JonB and @cvp, thanks once again! It seems to work in the way I expected now.

It seems that scene.t uses a different time frame from time.process_time, because with the same number value, the animations appear to go at different speeds.

cvp

@Vile thank only @jonb 😀