The First Drawing

Let’s draw a line from (0,0) to (640,480)

In computer graphics, we normally use a screen coordinate system as below:


In this system, the origin (0,0) is at screen’s upper left corner, and y-axis is growing top-down.

So the result is a line from upper left corner to lower right corner.

from easygraphics import *

def main():
    init_graph(640, 480)
    line(0, 0, 640, 480)