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WorksheetsCrash Course Computer Science #23 - Screens & 2D Graphics
Total questions: 16
Worksheet time: 11mins
What were early computer screens used for?
typing commands into the computer
keeping track of a program's operations
providing visual confirmation of calculations
eliminating the need to have computers and its peripherals separate
The earliest and most influential display technology
cathode ray tubes
LED screens
glass monitors
plastic terminals
What are the two ways to draw graphics with CRTs?
vector scanning
raster scanning
grid scanning
light node scanning
Modern __ also use raster scanning, but for colored pixels instead.
LED screens
liquid crystal displays
plasma displays
CRTs
Why didn't early screens use pixels?
They couldn't - the technology was too advanced
It was low quality, and images often hard to read
Too expensive to manufacture
It took up too much memory
What were the first graphics cards, used to read characters and convert into raster graphics?
RAM modules
ASCII reader
character generator
integrated circuits
The character generator would use the __ from the computer's memory.
character bank
screen buffer
text library
ASCII databank
Character generators were a clever way to save (a) , but they didn't provide any way to draw arbitrary (b) .
Vector mode on CRTs eliminated the ASCII limits by creating all visual displays with
pixels
points
lines
text
Vector graphics use a __ to generate designs.
grid
table
circle
3D plane
An early video game from 1962, ___, used vector animation.
Zork
Spacewar
Asteroids
blickblock
Sketchpad, an early CAD software, used a stylus-like pen to draw lines. What could it do?
make lines perfectly parallel
make corners 90 degrees
scale shapes up and down
independently create shapes
When did pixel graphics emerge?
1950s
1960s
1970s
1980s
Pixel data was used from the (a) buffer on the (b) of the graphics card.
The pixel coding example eventually turns into
a smiley face
a pong game
a slice of pizza
a PacMan
How many computers had interactive graphical screens in 1971?
(a)
