Program Implementation

Section 18.5 Program Implementation - 3

You may have noticed that the drawWall and drawDoor procedures do not worry about where the shape is being drawn. We could put a goto into them so that they handle jumping to the right location to draw their shape. But, that would make it so they can only draw in one location. We will want to call the drawWindow procedure twice to draw two different windows. That will not work if drawWindow always jumps to a fixed location to do its drawing.

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This version of the program has drawWindow defined. But, it is not tested yet. Add a test of the procedure to the end of the main part of the program.

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Checkpoint 18.5.1.

Test drawWindow by drawing a window at -100, 0

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def rectangle(turtle, width, height):
    # Assumes turtle faces East to start with
    turtle.pendown()
    turtle.begin_fill()
    turtle.forward(width)
    turtle.right(90)
    turtle.forward(height)
    turtle.right(90)
    turtle.forward(width)
    turtle.right(90)
    turtle.forward(height)
    turtle.right(90)
    turtle.end_fill()
    turtle.penup()

def drawWall(turtleName):
    turtleName.fillcolor("tan")
    rectangle(turtleName, 300, 200)

def drawDoor(turtleName):
    turtleName.fillcolor("black")
    rectangle(turtleName, 50, 100)

def drawWindow(turtleName):
    turtleName.fillcolor("light blue")
    #first row
    rectangle(turtleName, 25, 25)
    turtleName.forward(25)
    rectangle(turtleName, 25, 25)
    turtleName.backward(25)
    #reposition
    turtleName.right(90)
    turtleName.forward(25)
    turtleName.left(90)
    #second row
    rectangle(turtleName, 25, 25)
    turtleName.forward(25)
    rectangle(turtleName, 25, 25)

# main program
from turtle import *
steve = Turtle()
steve.speed(0)
steve.penup()
steve.goto(-150, 50)
drawWall(steve)                # test the drawWall procedure
steve.goto(-25, -50)
drawDoor(steve)                # test the drawDoor procedure

# add a test here for the window. Try drawing it at -100, 0
====
from unittest.gui import TestCaseGui

class myTests(TestCaseGui):
    def testOne(self):
        self.assertRegex("".join(self.getEditorText().split("\n")[-4:]), r"steve.goto\(\s*-100,\s*0\s*\)", "Testing that you goto the right location.")
        self.assertRegex("".join(self.getEditorText().split("\n")[-4:]), r"drawWindow\(\s*steve\s*\)", "Testing that you correctly call drawWindow.")

myTests().main()

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