'''lecture_05_triangle_heading.py
Oliver W. Layton
CS 151
Fall 2020
Lecture 05
Demonstrate the effects of changing the turtle's heading direction

Things to try:
- Draw a few triangles, turn the turtle in between, print heading.
- Replace turn with a fixed heading to relationship between absolute heading and relative turns
- Reset the heading to 0 to avoid unintended subsequent tilted shapes
'''
import turtle


def goto(x, y):
    '''Send turtle to new position (x,y) without drawing anything.
    '''
    turtle.penup()
    turtle.goto(x, y)
    turtle.pendown()


def triangle(x, y, edgeSize):
    ''' Draws a triangle'''
    goto(x, y)

    turtle.forward(edgeSize)
    turtle.left(120)
    turtle.forward(edgeSize)
    turtle.left(120)
    turtle.forward(edgeSize)
    turtle.left(120)


# Main code setup
# Speed up drawing
turtle.speed(0)

print('turtle current heading is:', turtle.heading())
triangle(0, 0, 100)

turtle.left(45)
triangle(100, 0, 100)
print('turtle current heading is:', turtle.heading())

turtle.left(45)
triangle(200, 0, 100)
print('turtle current heading is:', turtle.heading())
# Keep the hexagon up until the user clicks on the window
turtle.exitonclick()