2d line segment generation - 2d shape primitives, Computer Graphics

Assignment Help:

2D Line Segment Generation 

A digitally plotted line is basically an approximation of infinite number of points on an abstract line segment by only a finite number of points on a computer display.  This is needed because the display devices can only plot a finite number of points, however large the resolution of the device may be.  So, the key concept of any line drawing algorithm is to provide an efficient way of mapping a continuous abstract line into a discrete plane of computer display. 

This process is called rasterization or scan conversion.  These algorithms basically approximate a real valued line by calculating pixel coordinates to provide an illusion of line segment.  Since the pixels are sufficiently small, the approximation gives a good illusion of a continuous line segment to the human eyes.  To understand what is meant by rasterization, we plot a line segment on a pixel grid as shown in Fig (a).  The segment points are scan converted and approximated by a single shaded pixel as shown in Fig (b). Here we have shown a pixel by a square, but you know that a pixel actually has a disc shape with the boundary marked as the visible portion of the dot formed by the striking electron gun. The pixel shown here is the bounding rectangle of that dot.


Related Discussions:- 2d line segment generation - 2d shape primitives

Polygon representation methods - modeling and rendering, Polygon Representa...

Polygon Representation Methods - Modeling and Rendering Any scene to be created by computer graphics may include a variety of objects, a few of them natural and manmade. Hence

Positioning Techniques, Explain Positioning Techniques in computer Graphics...

Explain Positioning Techniques in computer Graphics in detail

Composite transformations - 2-d and 3-d transformations, Composite Transfor...

Composite Transformations - 2-d and 3-d Transformations We can build complicated transformations as rotation regarding to an arbitrary point, mirror reflection about a line, a

Explain the role of the prefight personnel, QUESTION a) Once a print jo...

QUESTION a) Once a print job is accepted by the print service provider, it will be assigned a job number and this information will become part of a printed job ticket, which wi

Three dimensional concepts and display methods, Three Dimensional Concepts ...

Three Dimensional Concepts and Display Methods   Imagine yourself taking a picture by a camera.  What do you normally do?  You specify a viewpoint and view direction and then s

3-d transformation, 3-D Transformation The capability to represent or ...

3-D Transformation The capability to represent or display a three-dimensional object is basically to the knowing of the shape of that object. Moreover, the capability to rotat

How many times will vertex appear in the intersection points, 1. For the po...

1. For the polygon shown in Figure on the next page, how many times will the vertex V 1 appear in the set of intersection points for the scan line passing through that point?  How

Subdivision algorithm - visible surface detection, Subdivision Algorithm - ...

Subdivision Algorithm - Visible Surface Detection 1) Initialize the area to be the whole screen. 2) Create a PVPL regarding an area, sorted on z min as the smallest z coor

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd