ASCII Character Codes Quiz

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Questions and Answers

What device can be generalized to include any device that returns character codes?

Keyboard

How many bytes does ASCII assign to each character?

One

What do encoders inside the mouse and trackball devices measure?

Motion

What allows for a much richer set of supported characters in Internet applications compared to ASCII?

<p>Multiple bytes for each character</p> Signup and view all the answers

Which type of detectors are used in some variants of devices to measure motion?

<p>Optical detectors</p> Signup and view all the answers

Why are small trackballs popular with portable computers?

<p>They can be incorporated directly into the keyboard</p> Signup and view all the answers

What kind of software do users use for editing lists of information for a renderer?

<p>Interactive modeling software</p> Signup and view all the answers

What model is commonly used to produce images of objects in real time?

<p>Synthetic-camera model</p> Signup and view all the answers

Where are the models and their properties placed for rendering?

<p>Scene graph</p> Signup and view all the answers

What is examined in Chapter 10 of the text?

<p>Scene graphs</p> Signup and view all the answers

What was the early display technology based on in early graphics systems?

<p>Calligraphic CRT display</p> Signup and view all the answers

What type of architecture was commonly used in early graphics systems?

<p>Von Neumann architecture</p> Signup and view all the answers

What is the essence of image formation?

<p>Combining the specification of the object with the specification of the viewer to produce a two-dimensional image.</p> Signup and view all the answers

What is missing in the description of image formation?

<p>The mention of light sources.</p> Signup and view all the answers

Why would objects be dark without light sources?

<p>Because there would be no illumination, making them not visible in images.</p> Signup and view all the answers

What determines how much light enters the camera in a physical imaging system?

<p>The details of the interaction between light and the surfaces of the object.</p> Signup and view all the answers

What is light considered as?

<p>A form of electromagnetic radiation.</p> Signup and view all the answers

How many dimensions is the image that is found on the film plane?

<p>Two-dimensional.</p> Signup and view all the answers

What does the moveto function do in the graphics system described?

<p>Moves the pen to the specified location on the paper without leaving a mark.</p> Signup and view all the answers

Explain the function of lineto in the graphics system.

<p>Moves the pen to a new location and draws a line from the old to the new pen location.</p> Signup and view all the answers

What is the purpose of initialization and termination procedures in the graphics system?

<p>They help set up and clean up the drawing environment.</p> Signup and view all the answers

How can you alter the drawing color or line thickness in the graphics system?

<p>By changing pens.</p> Signup and view all the answers

What is an application where systems built on the graphics model described work well?

<p>Page layout in the printing industry.</p> Signup and view all the answers

What is an example of a standard language in the printing industry that extends the described graphics ideas?

<p>PostScript pagedescription language.</p> Signup and view all the answers

What can the user program do if there is an event in the queue?

<p>The program can look at the event's type and then decide what to do.</p> Signup and view all the answers

What is associated with a specific type of event?

<p>A function called a callback.</p> Signup and view all the answers

Why is the event-mode model approach used?

<p>Because it is the one currently used with the major window systems and has proved effective in client-server environments.</p> Signup and view all the answers

What is the traditional pedagogical approach to teaching computer graphics?

<p>Starting with how to construct raster images of simple two-dimensional geometric entities.</p> Signup and view all the answers

What kind of images can be created using the traditional pedagogical approach?

<p>Simple images of simple objects.</p> Signup and view all the answers

What is included in the discussion of two- and three-dimensional mathematical objects in the computer?

<p>How to image them with the set of two-dimensional rasterized primitives.</p> Signup and view all the answers

Flashcards

Character Code Device

Any device that inputs character codes.

ASCII Character Bytes

One byte.

Mouse/Trackball Encoders

Motion.

Rich Character Sets

Using multiple bytes for each character.

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Motion Detector Type

Optical detectors.

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Trackball Popularity

They can be incorporated directly into the keyboard.

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Renderer List Editor Software

Interactive modeling software.

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Real-Time Image Model

Synthetic-camera model.

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Model Storage Location

Scene graph.

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Chapter 10 Topic

Scene graphs.

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Early Display Technology

Calligraphic CRT display.

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Early Graphics Architecture

Von Neumann architecture.

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Essence of Image Formation

Combining object and viewer specifications for a 2D image.

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Missing in Image Formation

Light sources.

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Objects Without Light

No illumination, hence not visible.

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Light Entering Camera

Interaction between light and object surfaces.

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Nature of Light

A form of electromagnetic radiation.

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Image Dimensions

Two-dimensional.

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moveto Function

Moves the pen without drawing.

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lineto Function

Draws a line from the old to the new pen location.

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Initialization/Termination

Setting up and cleaning up the drawing environment.

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Altering Drawing Color/Line Thickness

By changing pens.

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Graphics Model Application

Page layout in the printing industry.

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Standard Printing language

PostScript page-description language.

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Event Queue Action

The program can look at the event's type and then decide what to do.

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Event Association

A function called a callback.

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Event-Mode Model Use

Effective in client-server environments.

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Traditional Computer Graphics Approach

Starting with raster images of simple 2D geometric entities.

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Created Images

Simple images of simple objects.

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Dimensional Object Discussion

How to image mathematical objects with 2D rasterized primitives.

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Study Notes

Interactive Modeling Software

  • For complex scenes, users use interactive modeling software to edit lists of information for a renderer.
  • Most modelers use the synthetic-camera model to produce images in real-time.

Graphics Architectures

  • Early graphics systems used general-purpose computers with the standard von Neumann architecture.
  • These computers have a single processing unit that processes a single instruction at a time.

Input Devices

  • The keyboard device returns character codes using the American Standard Code for Information Interchange (ASCII).
  • The mouse and trackball are similar in use and construction, converting motion to signals sent back to the computer.
  • There are many variants of these devices, some using optical detectors rather than mechanical detectors to measure motion.

Graphics Systems and Models

  • A scene graph is a data structure that contains models, including geometric objects, lights, cameras, and material properties.
  • The scene graph is passed to a renderer or game engine.

Image Formation

  • Image formation is the process of combining the specification of an object with the specification of a viewer to produce a two-dimensional image.
  • Light is a form of electromagnetic radiation that interacts with surfaces of objects and enters the camera through the lens.

Programmer’s Interface

  • A simple graphics system can be described with two drawing functions: moveto(x, y) and lineto(x, y).
  • The moveto function moves the pen to a location without leaving a mark, while the lineto function moves the pen to a location and draws a line from the old to the new location.

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