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

Find the normalization transformation, Illustration: Find the normalizatio...

Illustration: Find the normalization transformation N that uses the rectangle W (1, 1), X (5, 3), Y (4, 5) and Z (0, 3) as a window and also the normalized device screen like the

Explain the merits and demerits of plasma panel display, Explain the merits...

Explain the merits and demerits of Plasma panel display. Advantages: Refreshing is not needed. Produce a very steady image free of Flicker. Less bulky than a CRT.

Explain any ten types of artistic filters, Question 1 Explain any ten type...

Question 1 Explain any ten types of artistic filters Question 2 What is Freehand Tool? Explain the procedure of drawing lines and curves with freehand tool Question 3 Ho

Explain what is the bleed and its purposes, QUESTION (a) Name the space...

QUESTION (a) Name the spaces and guides in the Figure below                 (b) What is the difference between Pantone and Process colors? Elaborate (c) Explain what i

Perspective projections - transformation, Perspective Projections - Transfo...

Perspective Projections - Transformation In this projection the center of projection is at limited distance. This projection is termed as perspective projection since in this

Assumption for diffuse reflection - polygon rendering, Assumption for Diffu...

Assumption for Diffuse Reflection - Polygon Rendering  i) the diffuse reflections by the surface are scattered along with equal intensity in each direction, independent of vie

Translation, Translation, Rotation and Scaling -  output primitives 1. ...

Translation, Rotation and Scaling -  output primitives 1. Two basic approaches used in character generation are - Bitmap method and outline method.  2. All 2D geometric tran

Low level techniques (motion specific), Low level techniques (motion specif...

Low level techniques (motion specific) Techniques utilized to fully control the motion of any graphic object in any type of animation scene, these techniques are also considere

Graphic file compression formats, Graphic File Compression Formats Web...

Graphic File Compression Formats Web graphics are by requirement compressed due to the bandwidth issues surrounding networked delivery of information and since image files inc

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