Coordinates of the Turtle World¶

In the turtle world, we use a coordinate system as the following:

The origin (0,0) is at the center of the graphics window.
The x axis grows from left to right.
The y axis grows from bottom to top.

Set the turtle’s position¶

setxy(x,y) set the turtle’s position to point(x,y) without a trace.

gotoxy(x,y) move the turtle to point(x,y). So if the pen is down, there will be a trace.

The turtle’s heading direction will not change.

The following program demonstrated the result of gotoxy() and setxy().

from easygraphics.turtle import *

def main():
    create_world(300,300)
    gotoxy(50,-100)
    for i in range(360):
        fd(1)
        lt(1)
    pause()
    cs()

    setxy(50,-100)
    for i in range(360):
        fd(1)
        lt(1)

    pause()
    close_world()

easy_run(main)

Set the Turtle’s heading¶

facing(x,y) set the turtle heading to facing point(x,y).

from easygraphics.turtle import *

def main():
    create_world(300,300)

    # set the turtle's heading to top-left corner of the graphics window
    facing(-150,150)
    fd(100)

    pause()
    close_world()

easy_run(main)

set_heading(angle) set the turtle’s new orientation to angle.

Values of the angles in the turtle world are as the following:

from easygraphics.turtle import *

def main():
    create_world(300,300)

    # set the turtle's heading to top-left corner of the graphics window
    set_heading(30)
    fd(100)

    pause()
    close_world()

easy_run(main)

Get turtle’s current state¶

get_x() return the x coordinate value of the turtle’s position.

get_y() return the y coordinate value of the turtle’s position.

get_heading() return the angle value of the turtle’s heading.

from easygraphics.turtle import *

def main():
    create_world(300,300)

    # set the turtle heading to top-left corner of the graphics window
    facing(-150,150)
    fd(100)

    draw_text(-140, -130, "(%.2f, %.2f), heading(%.2f)" % (get_x(), get_y(), get_heading()))
    pause()
    close_world()

easy_run(main)