Chapter 4

Question 1

TF

Using graphics.py allows graphics to be drawn into a Python shell window.

Answer 1

False

Question 2

TF

Traditionally, the upper-left corner of a graphics window has coordinates (0,0).

Answer 2

True

Question 3

TF

A single point on a graphics screen is called a pixel.

Answer 3

True

Question 4

TF
A function that creates a new instance of a class is called an accessor.

Answer 4

False

Question 5

TF

Instance variables are used to store data inside an object.

Answer 5

True

Question 6

TF

The statement myShape.move(10,20) moves myShape to the point (10,20).

Answer 6

False

Question 7

TF

Aliasing occurs when two variables refer to the same object.

Answer 7

True

Question 8

TF

The copy method is provided to make a copy of a graphics object.

Answer 8

False

Question 9

TF

A graphics window always has the title “Graphics Window.”

Answer 9

False

Question 10

TF

The method in the graphics library used to get a mouse click is readMouse.

Answer 10

False

Question 11

A method that returns the value of an object’s instance variable is called a(n)

Answer 11

accessories

Question 12

A method that changes the state of an object is called a(n)

Answer 12

Mutator

Question 13

What graphics class would be best for drawing a square?

Answer 13

Rectangle

Question 14

What command would set the coordinates of win to go from (0,0) in the lower-left corner to (10,10) in the upper-right?

Answer 14

win.setcoords(0, 0, 10, 10)

Question 15

What expression would create a line from (2,3) to (4,5)?

Answer 15

Line(Point(2,3), Point(4,5))

Question 16

What command would be used to draw the graphics object shape into the graphics window win?

Answer 16

shape.draw(win)

Question 17

Which of the following computes the horizontal distance between points p1 and p2?

Answer 17

abs(p1.getX() - p2.getX())

Question 18

What kind of object can be used to get text input in a graphics window?

Answer 18

Entry

Question 19

A user interface organized around visual elements and user actions is called a(n)

Answer 19

GUI

Question 20

What color is color_rgb(0,255,255)?

Answer 20

Cyan