Turtle - Graphing Calculator

Objectives:

• You will practice creating while loops
• You will integrate loops into drawing graphics with Python's turtle
• You will create a basic graphing calculator

Resources:

• Python Turtle Reference

Directions:

1. Name your file: turtleGrapher.py:
2. Set your turtle's speed to the fastest: speed(0)
3. Use numinput() to prompt the user for the width of the window and store in a variable named width
4. Use numinput() to prompt the user for the height of the window and store in a variable named height
5. Change the dimensions of the window by using setup(width, height) and then screensize(width, height)
6. Draw a line that represents the x-axis through the middle of the screen
7. Draw a line that represents the y-axis through the middle of the screen
8. Use textinput() to prompt the user to enter an equation (e.g. 2*x+3) and store it in a variable: eq
9. Write a while loop where x starts at -width/2 and goes all the way through width/2
   1. Inside the while loop, use eval to get the y-value of the equation: y = eval(eq)
   2. Tell the turtle to goto(x, y)
   3. Make sure your the turtle's pen is down so that the graph is drawn
10. Tell the turtle window to exit when it is clicked

Advanced: (Optional)

• Once you have the basic calculator working, try to implement a zoom feature that draws the equation bigger
• Draw the tick marks on the x and y-axes