🔒 why cube spawning somewhere at negatives coordinates?

[restive rose]

Just trying to do a fun thing but its spawns at negative coordinates instead of positive coordinates, trying to do a research but i didnt found anything, i dont really know why that happened

[misty ore]

@restive rose

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[restive rose]

from tkinter import *

tx=0
ty=0
tz=15
zoom=100
width=370
height=350
a=1

def together(x, y, z):
    x-=width//2
    y-=height//2
    print(((x+tx)/(tz+z))*zoom+width//2, ((y+ty)/(tz+z))*zoom+height//2)
    return ((x+tx)/(tz+z))*zoom+width//2, ((y+ty)/(tz+z))*zoom+height//2


def changeidk(which, i):
    global tz
    global tx
    global ty
    if which=='tz':
        tz+=i
    elif which=='tx':
        tx+=i
    elif which=='ty':
        ty+=i

def main():
    canvas.delete(ALL)
    canvas.create_line(together(20, 20, 0), together(50, 20, 0))
    canvas.create_line(together(50, 20, 0), together(50, 50, 0))
    canvas.create_line(together(50, 50, 0), together(20, 50, 0))
    canvas.create_line(together(20, 50, 0), together(20, 20, 0))

    canvas.create_line(together(20, 20, 10), together(50, 20, 10))
    canvas.create_line(together(50, 20, 10), together(50, 50, 10))
    canvas.create_line(together(50, 50, 10), together(20, 50, 10))
    canvas.create_line(together(20, 50, 10), together(20, 20, 10))

    canvas.create_line(together(20, 20, 0), together(20, 20, 10))
    canvas.create_line(together(50, 20, 0), together(50, 20, 10))
    canvas.create_line(together(50, 50, 0), together(50, 50, 10))
    canvas.create_line(together(20, 50, 0), together(20, 50, 10))
    root.after(60, main)

root=Tk()
root.title('3d Engine')
root.geometry('370x350')
root.resizable(width=False, height=False)
canvas=Canvas(root, width=370, height=350)
canvas.pack(expand=True)
root.after(1000, main)

root.bind('w', lambda x: changeidk('ty', 1))
root.bind('a', lambda x: changeidk('tx', -1))
root.bind('s', lambda x: changeidk('ty', -1))
root.bind('d', lambda x: changeidk('tx', 1))
root.bind('x', lambda x: changeidk('tz', 1))
root.bind('z', lambda x: changeidk('tz', -1))
root.mainloop()

[fresh bane]

I don't get what you mean. You already have the print, you can see which function does it badly - the function that does the printing.

So let's analyse first together call, together(20, 20, 0)

def together(x, y, z):
    x-=width//2
    y-=height//2

After those two lines x == -165, y == -155

    print(((x+tx)/(tz+z))*zoom+width//2, ((y+ty)/(tz+z))*zoom+height//2)
    return ((x+tx)/(tz+z))*zoom+width//2, ((y+ty)/(tz+z))*zoom+height//2

And with such x and y it prints -915.0 -858.3333333333335

So now it's time to think: why did you do the -width//2? What did you want to do instead?
Maybe you meant +width//2? It would mean the coordinates passed to function are calculated from the centre of the screen.

[restive rose]

I used -width//2 to size cubes by center of the cubes

Wait

[fresh bane]

How did you want it to be "by center of the cubes" when width is width of the screen?

[restive rose]

Idk, im dumb

[fresh bane]

Right now you do "move the cube points half a screen away from screen 😛
As I said, you could do +width//2 to have the coordinates work as from centre of the screen (function getting 0,0 would mean centre of the screen)
But minus makes no sense at all

[restive rose]

so i need to do only

return ((x+tx)/(tz+z))*zoom+width//2, ((y+ty)/(tz+z))*zoom+height//2
```?

[fresh bane]

For now I'd say yes. I have no idea why you did the minus. If you find out what you wanted to do exactly, you can try experimenting to do it properly

[restive rose]

ok, thanks!

[misty ore]

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