move origin to the left bottom corner

To move the origin to the left bottom corner, you can modify the coordinate system of your graphics environment. In most cases, this can be done by adjusting the y-axis scaling factor and offset. Specifically, you can set the y-axis scaling factor to a negative value, which will vertically flip the coordinate system, and then add the height of the graphics window to the y-axis offset, which will shift the origin to the left bottom corner.

Here's an example in Python using the Pygame library:

import pygame

# initialize Pygame
pygame.init()

# create a graphics window
width, height = 640, 480
screen = pygame.display.set_mode((width, height))

# flip the y-axis and shift the origin
pygame.display.flip()
pygame.display.glScalef(1, -1)
pygame.display.glTranslatef(0, -height, 0)

# draw a rectangle at (0, 0)
rect = pygame.Rect(0, 0, 50, 50)
pygame.draw.rect(screen, (255, 255, 255), rect)

# update the screen
pygame.display.flip()

# run the event loop
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()

In this example, we first create a graphics window with the specified width and height. Then, we flip the y-axis and shift the origin using the `glScalef` and `glTranslatef` functions from the Pygame library. Finally, we draw a white rectangle at the original position (0, 0) and update the screen. The event loop enables the window to stay open until the user closes it.