Display File Structure in Computer Graphics PDF: A Complete Guide
If you are interested in learning how to display file structure in computer graphics PDF, you have come to the right place. In this article, you will learn what display file structure is, why it is important, and how to implement it using different techniques. You will also see some examples of display file structure in action.
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What is Display File Structure?
Display file structure is a way of organizing and storing the information needed to generate a graphical image on a display device, such as a monitor or a printer. Display file structure can be either structured or unstructured, depending on how the information is arranged and accessed.
Unstructured display file structure is a simple linear list of instructions for a display processor, such as draw a line, fill a polygon, or set a pixel color. Unstructured display file structure is easy to create and modify, but it can be inefficient and redundant if the same elements are repeated multiple times in the image.
Structured display file structure is a more complex and hierarchical way of organizing the information for a display processor. Structured display file structure uses pointers, branches, subroutines, and transformations to create a tree-like structure that can represent complex images with less data and more flexibility. Structured display file structure can also support conditional and interactive elements, such as inputs from pointing devices or user-defined parameters.
Why is Display File Structure Important?
Display file structure is important for several reasons:
It affects the quality and performance of the graphical image. A good display file structure can reduce flickering, aliasing, and artifacts, as well as improve the speed and efficiency of the display processor.
It affects the memory and storage requirements of the graphical image. A good display file structure can reduce the size and complexity of the data needed to represent an image, as well as facilitate compression and decompression techniques.
It affects the ease and flexibility of creating and modifying the graphical image. A good display file structure can simplify the specification and generation of an image, as well as support dynamic and interactive features.
How to Implement Display File Structure?
There are different ways of implementing display file structure, depending on the type of display device, the type of graphical image, and the type of application. Some of the common techniques are:
Display procedures: These are functions or subroutines that generate information for display. Display procedures can be called with parameters or transformations to create different instances of an element or a symbol. Display procedures can also include conditional statements or inputs from pointing devices to create interactive elements.
Display lists: These are arrays or linked lists that store the information for display. Display lists can be created by calling display procedures or by directly specifying the instructions for a display processor. Display lists can be executed by a display processor or by another program that interprets them.
Frame buffers: These are memory devices that store the pixel values for each location on a raster display device. Frame buffers can be written by a display processor or by another program that generates the pixel values. Frame buffers can be read by a raster display device or by another program that processes them.
Examples of Display File Structure
To illustrate how display file structure works in practice, let us look at some examples of graphical images and how they can be represented using different techniques.
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Let us see some examples of line drawing using display procedures, display lists, and frame buffers.
Example 1: Line Drawing Using Display Procedures
Display procedures are functions or subroutines that generate information for display. They can be called with parameters or transformations to create different instances of an element or a symbol. For example, we can define a display procedure to draw a line segment between two given points:
def draw_line(x1, y1, x2, y2):
# calculate the slope and the intercept
m = (y2 - y1) / (x2 - x1)
b = y1 - m * x1
# loop over the x-coordinates from x1 to x2
for x in range(x1, x2 + 1):
# calculate the corresponding y-coordinate
y = m * x + b
# set the pixel at (x, y) to black
set_pixel(x, y, black)
We can then use this display procedure to draw different lines by passing different arguments. For example, we can draw a triangle by calling the display procedure three times:
# draw a triangle with vertices at (100, 100), (200, 200), and (300, 100)
draw_line(100, 100, 200, 200)
draw_line(200, 200, 300, 100)
draw_line(300, 100, 100, 100)
The result would look something like this:
Example 2: Line Drawing Using Display Lists
Display lists are arrays or linked lists that store the information for display. They can be created by calling display procedures or by directly specifying the instructions for a display processor. For example, we can create a display list to store the information for drawing a line segment between two given points:
# create an empty display list
display_list = []
# append the instruction to move to the first point
display_list.append(\"move_to(100, 100)\")
# append the instruction to draw a line to the second point
display_list.append(\"draw_to(200, 200)\")
We can then execute this display list by passing it to a display processor or by another program that interprets it. For example, we can write a simple interpreter that loops over the display list and executes each instruction:
# loop over the display list
for instruction in display_list:
# split the instruction into command and arguments
command, args = instruction.split(\"(\")
args = args.strip(\")\").split(\",\")
# execute the command with the arguments
if command == \"move_to\":
# move the current position to (x, y)
x = int(args[0])
y = int(args[1])
move_to(x, y)
elif command == \"draw_to\":
# draw a line from the current position to (x, y)
x = int(args[0])
y = int(args[1])
draw_to(x, y)
The result would look something like this:
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