Trouble using imported images from Photos

iOSBrett

Hi,

I am currently teaching some young kids to code using Pythonista, our current project is Pac Man. As the kids are young I am having to take some shortcuts. For instance instead of building the background with tiles, I just want to load it from an image.

So I have saved some images from the internet and am attempting to load them into my Scene as a SpriteNode. I can import them into Pythonista without any issue, however when I try to use them in the code I get strange errors. Sometime it is ‘could not load image’, but other times it gives errors on future lines, such as if you forget a semi colon.

My image is in the same folder as the code, and I have tried lots of different images. One time one image worked, so I deleted it and tried again (need to ensure it works for kids) and it failed.

I am on iOS11 with the latest version of Pythonista. Has anybody ne experienced this issue or have an ideas?

‘’’
from scene import *
import sound
import random
import math
from joystick import Joystick
from player import Player
from tile import Tile
from direction import Direction

A = Action

class MyScene (Scene):
def setup(self):

    self.background_color = '#000000'
    
    self.background = SpriteNode('IMG_0204.PNG')
    self.background.position = self.size.width / 2, self.size.height / 2
    self.add_child(self.background)

‘’’

cvp

Sorry for all, I'm not proud of me. My little script loads an ui.Image but I had let the image name in the SpriteNode line. I'll go back in my bed.

cvp

import ui
from scene import *

class MyScene (Scene):
    def setup(self):
        self.background_color = '#000000'
        ui_image = ui.Image.named('IMG_5903.JPG')   # 5 MB 3672x4896 px   **** Error
        #ui_image = ui.Image.named('IMG_3735.JPG')  # 4 MB 1536x2048 px **** ok
        #ui_image = ui.Image.named('IMG_6575.JPG')  # 43 KB 640x853 px  **** ok
        self.background = SpriteNode(ui_image)
        self.background.position = self.size.width / 2, self.size.height / 2
        self.add_child(self.background)

run(MyScene())

No error with photo of 4 Mb but error with photo of 5 Mb

cvp

Big photo is here

JonB

what if you create the SpriteNode outside of the scene?

cvp

@JonB idem

JonB

ohh, ok. scene Textures are opengl based, i think. So you cannot have a Texture that is larger in pixels that the graphics memory region, which is something like twice largest screen size (for retina displays).

with ui.ImageContext(1024*2,1024*2) as ctx:
   #ui.Image.named('IMG_0625.JPG').draw()
   Texture(ctx.get_image())

The above works, on my Ipad3. Anything up to 2048 in either row/col works, but even 2049x1 fails. so, that tells me the opengl textures must be <=2048 in either dimension.

cvp

@JonB that's ok, thanks for @iOSBrett

Drizzel

I‘m having a somewhat similar issue, I can’t even load an image that’s 511 kB in size. I haven’t used the scene module for some time now and my memory is a bit rusty, but the following code should run without an issue, right?
Here it is:

from scene import *
import os

A = Action
class MyScene (Scene):
    def setup(self):
        img = 'rectangle_1.png'
        self.background_color = 'white'
        if img in os.listdir(): print('yes')    #prints 'yes' in console
        print(ui.Image.named('IMG_5903.JPG')) #prints None in console
        #a = Texture(img) #Image not found
        a = SpriteNode(img) #could not load texture
        self.add_child(a)
        pass
    
if __name__ == '__main__':
    run(MyScene(), show_fps=False)

pulbrich

Wouldn’t you need an

import ui

before using ui.Image?

JonB

Try

    img = 'rectangle_1.png'
    self.background_color = 'white'
    if img in os.listdir(): print('yes')            
    printt(ui.Image.named(img))

You were checking one file, but trying to open a different one

Drizzel

@pulbrich no, it actually functions. The output is the same if I use “import ui” and when I don’t.

@JonB your suggestion prints the following:

yes
<_ui.Image object at 0x108fe9e40>

Drizzel

I figured out the issue. Whenever I import an image from my camera roll, it’s ending is in caps (.PNG). Renaming it to .png causes the issue, so I’m just going to not do that :)

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