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

Different types of simulating motion - computer animation, Different types ...

Different types of Simulating Motion - Computer Animation Here we discuss different ways of simulating motion as: a. Zero Acceleration or Constant Speed b. No

Multimedia applications, what are activities to be undertaken or executed a...

what are activities to be undertaken or executed and the expected output of each activity for a plan creation of a movie?

What is bitmap and what is pixmap, What is bitmap and what is pixmap?  ...

What is bitmap and what is pixmap?  The frame buffer used in the black and white system is called as bitmap which take one bit per pixel. For systems with many bits per pixel,

Convex shaped window and concave or non convex shaped window, Well you migh...

Well you might surprise to what a convex window? In common, on the basis of the shapes the windows are categorized into two classes: i) A Convex shaped windows: Windows of a s

Cathode ray tube - graphics hardware, Cathode Ray Tube - Graphics Hardware ...

Cathode Ray Tube - Graphics Hardware Cathode Ray Tube: this is a refreshing display device. The idea of a refreshing display is depicted pictorially is given as: In fact

Odd-even rule and non-zero winding number rule, What is the difference betw...

What is the difference between odd-even rule and non-zero winding number rule to identify interior regions of an object? Develop an algorithm for a recursive method for filling a 4

Transformation for 3-d scaling, As we already seen that the scaling proces...

As we already seen that the scaling process is mainly utilized to change the size of an object. The scale factors find out whether the scaling is a magnification as s>1 or a red

Vecgen algorithm and bresenham line, what is vecgen algorithm and bresenha...

what is vecgen algorithm and bresenham linequestion..

Graphics, GRAPHICS: It is one of the core elements of any multimedia ...

GRAPHICS: It is one of the core elements of any multimedia application. We all have heard a well-known saying as "one picture conveys a message of 1000 words", hence without

Geometrical examine types of line clipping, Geometrical examine Types of Li...

Geometrical examine Types of Line Clipping Geometrical examine of the above kinds of clipping (it assists to get point of intersection of line PQ along with any edge). Assu

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