Chapter 6, Problem 16PE

Program Plan Intro

Draw a face

Program plan:

• Import the header file.
• Define the “drawFace” method
  • Get the “x” and “y” positions
  • Get the “p1” and “p2” positions
  • Call the “Oval” method for drawing the face
  • Set the color to the face
  • Draw the face
  • Get the “lc” and “rc” position
  • Call the “Circle” method
  • Set the color to the face
  • Call the “draw” method
  • Call the “Circle” method
  • Set the color to the face
  • Call the “draw” method
  • Get the “m1”, “m2”, and “m3” values
  • Call the “Rectangle” method
  • Set the color to the face
  • Call the “draw” method
  • Call the “Line” method
  • Get the center position
  • Get the “x” and “y” position
  • Call the “Point” method
  • Call the “Line” method
  • Call the “draw” method
  • Get the “x” and “y” position for different variables
  • Calculate “t” and “t1” value
  • Call the “Rectangle” method
  • Call the “draw” method
  • Iterate “i” until it reaches 7
    • Clone the teeth by calling “clone” method
    • Move the face by calling “move” method
    • Call the “draw” method
• Define the main method.
  • Read the filename from the user
  • Get the image width and height from the file
  • Set the graph win size
  • Set the coords for graph
  • Draw the face
  • Get the number of faces from the user
  • Iterate “i” until it reaches “n” value
    • Get the mouse action
    • Call the “drawFace” method
• Call the function “main()”.

Program Description Answer

This Python program is used to get the GIF (Graphic Interchange format) file and draw the smileys when the user clicking the GIF image.

Explanation of Solution

Program:

#import the header file

from graphics import *

#definition of "drawFace" method

def drawFace(center, size, window):

    #get the "x" value

    x1 = center.getX()

    #get the "y" value

    y1 = center.getY()

    #get the "p1" value

    p1 = Point(x1-(.7 * size), y1 - size)

    #get the "p2" value

    p2 = Point(x1+(.7 * size), y1 + size)

    #call the "Oval" method

    head = Oval(p1, p2)

    #fill the color

    head.setFill("white")

    #call the "draw" method

    head.draw(window)

    #get the "lc" value

    lc = Point(x1 - .2 * size, y1 + .6 * size)

    #get the "rc" value

    rc = Point(x1 + .2 * size, y1 + .6 * size)

    #call the "Circle" method

    leftEye = Circle(lc, .13 * size)

    #fill the color

    leftEye.setFill("white")

    #call the "draw" method

    leftEye.draw(window)

    #call the "Circle" method

    rightEye = Circle(rc, .13 * size)

    #fill the color

    rightEye.setFill("white")

    #call the "draw" method

    rightEye.draw(window)

    #get the "m1" value

    m1 = Point(x1 - .3 * size, y1 - .5 * size)

    #get the "m2" value

    m2 = Point(x1 + .3 * size, y1 - .25 * size)

    #get the "m3" value

    m3 = Point(x1 + .3 * size, y1 - .5 * size)

    #call the "Rectangle" method

    mouth = Rectangle(m1, m2)

    #fill the color

    mouth.setFill("white")

    #call the "draw" method

    mouth.draw(window)

    #call the "Line" method

    leftLip = Line(m1, Point(x1- .3 * size, y1 - .25 * size))

    #get the center position

    mLeftCent = leftLip.getCenter()

    #get the "x" position

    mLCx = mLeftCent.getX()

    #get the "y" position

    mLCy = mLeftCent.getY()

    #call the "Point" method

    mRightCent = Point(x1 + .3 * size, mLCy)

    #call the "Line" method

    lip = Line(mLeftCent, mRightCent)

    #call the "draw" method

    lip.draw(window)

    #get the "x" positions

    m1x = m1.getX()

    m3x = m3.getX()

    #get the "y" positions

    m1y = m1.getY()

    m2y = m2.getY()

    #calculate the "t" value

    t = m1x - m3x

    #calculate the "t1" value

    t1 = Point(m1x - (1/8 * t), m2y)

    #call the "Rectangle" method

    teeth = Rectangle(m1, t1)

    #call the "draw" method

    teeth.draw(window)

    #iterate "i" until it reaches 7

    for i in range (7):

        #clone the face

        t2 = teeth.clone()

        #call the "move" method

        t2.move(-i * (1/8 * t), 0)

        #call the "draw" method

        t2.draw(window)

#definition of main method

def main():

    #get the input filename from the user

    fname = input("Enter filename: ")

    infile = Image(Point(10, 10), fname)

    #get the width of the image

    wWidth = infile.getWidth()

    #get the height of the image

    wHeight = infile.getHeight()

    #set graph win name

    window = GraphWin('Smile!', wWidth,wHeight)

    #set the coords

    window.setCoords(0, 0, 20, 20)

    #draw a smiley

    infile.draw(window)

    #get how many faces the user wants to draw

    n = eval(input("How many faces should we block? "))

    #iterate "i" until it reaches "n"

    for i in range(n):

        #get the mouse action

        point = window.getMouse()

        #draw a face by calling the method "drawFace"

        drawFace(point, 3, window)

#call the "main" method

main()

Sample Output

Output:

Enter filename: test_img.gif

How many faces should we block? 2

>>>

Screenshot of “Smile!” window