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True or False?

Answer 29

What is the meaning of the following two images?

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Answers

Answer 29

True

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Answer 28

True. One example is the graphical addition of vectors using the tail-to-head placement.

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Answer 27

True, because according to Kjell, a vector doesn't have a position. Hence, there is nothing in the underlying data for a GM2D02.Vector object that specifies a position.

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Answer 26

False. The draw method of the GM2D02.Vector class requires two parameters:

  • A reference to the off-screen graphics context
    • on which the visual manifestation of the vector will be drawn.
  • A reference to an object of the class GM2D02.Point
    • that will be used to determine the position on the off-screen image in which the visual manifestation will appear.

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Answer 25

True

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Answer 24

False. An object of type Ellipse2D.Double represents an ellipse that is bounded by the four sides of a rectangle. If the rectangle is square, theellipse becomes a circle .

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Answer 23

True

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Answer 22

True

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Answer 21

False. One of the hallmarks of object-oriented programming is that objects do know how to do useful things for themselves.

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Answer 20

False. The Line2D.Double class is a member of the standard Java library, whereas the GM2D02.Line class is a member of the special game math library named GM2D02 .

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Answer 19

True

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Answer 18

False. A call to the draw method of the GM2D02.Line class causes an object of the standard Java Line2D.Double class to be rendered onto the specified graphics context.

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Answer 17

True

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Answer 16

True

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Answer 15

True

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Answer 14

False. The returned value of the createImage method is type Image .

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Answer 13

True

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Answer 12

True

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Answer 11

True

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Answer 10

H. All of the above

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Answer 9

True

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Answer 8

False. All Java parameters are passed to methods by value.

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Answer 7

A. An underlying data object

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Answer 6

False. GM2D02.Vector objects represent themselves as lines with small circles at their heads in a graphics context for the benefit of humanobservers.

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Answer 5

False. GM2D02.Point objects represent themselves as small black circles in a graphics context for the benefit of human observers.

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Answer 4

True

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Answer 3

False. A point is simply a location in space. It has no width, depth, or height. Therefore, it cannot be seen by the human eye, which means that we can'tdraw a point on the computer screen. However, it is possible to draw an object on the computer screen that indicates the location of the point.

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Answer 2

False. Points in space exist regardless of whether or not visual objects are created to mark the locations of the points.

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Answer 1

True

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Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Game0110r Review: Updating the Game Math Library for Graphics
  • File: Game0110r.htm
  • Published: 12/31/12
  • Revised: 12/27/14
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

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Source:  OpenStax, Game 2302 - mathematical applications for game development. OpenStax CNX. Jan 09, 2016 Download for free at https://legacy.cnx.org/content/col11450/1.33
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