Scan line algorithm and seed fill algorithm, Computer Graphics

Assignment Help:

Scan line algorithm and seed fill algorithm

Two basic approaches are followed in area filling on raster systems.  In the first approach overlap intervals for scan lines that cross the area are determined per scan line.  Remember that a scan line is a horizontal line of pixels that can be plotted on the display device when the electron beam traverses the display area horizontally during one horizontal retrace. Second approach begins with an interior point and fills the area moving outward from this point until the boundary condition is reached.  An algorithm following the first approach is classified as scan line algorithm and that falling under second class is called seed fill algorithm.  Simple objects such as polygons, circles etc. are efficiently filled with scan line fill algorithms and more complex regions use the seed fill method. The scan line algorithm is mostly used in general graphics packages.

1326_scan line algorithm and seed fill algorithm.png

Let us begin with scan line polygon fill algorithm.  Notice that polygons can be as simple as a triangle and could be as complicated as the one shown in Figure below.

2399_scan line algorithm and seed fill algorithm 1.png

These are self intersecting polygons.  We broadly keep the polygons in one of the three categories (i) convex (ii) concave (iii) self intersecting.  Mathematically, a self intersecting polygon is concave.  You will deal with such polygons in greater details for the purpose of area filling.


Related Discussions:- Scan line algorithm and seed fill algorithm

Drawing program with object- oriented design, For this assignment, you will...

For this assignment, you will add to the drawing program new features that are similar to features that you already have. Apply object-oriented design concepts such as inheritance

Objectives-visible-surface detection, After going through this section, you...

After going through this section, you should be capable to: know the meaning of Visible-surface detection; distinguish among image-space and object-space approach for vi

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 clearly the condense editing using examples, QUESTION 1. Creat...

QUESTION 1. Create a COMPLETE storyboard for a movie of 2 minutes duration on ONE of the following subject: a. Poverty b. Global Warming c. Smoking d. Drugs e. D

Sutherland hodgman algorithm, Sutherland-Hodgman Algorithm Any polygon...

Sutherland-Hodgman Algorithm Any polygon of any type of arbitrary shape can be explained with the assist of some set of vertices connected with it. While we try to clip the po

Frame buffers - graphics hardware, Frame Buffers - Graphics Hardware ...

Frame Buffers - Graphics Hardware The storage region in a raster scan display system is set as a two-dimensional table. All row-column entry stores information as brightness

Whether cavalier projection is a parallel projection, State whether the fol...

State whether the following statements are true or false. Give reasons/examples to justify your answer.  a)  Cavalier projection is a parallel projection. b)  Angles are not

Methods for drawing thick lines, Describe any two methods for drawing thick...

Describe any two methods for drawing thick lines. Two method for drawing thick lines are: (1) Using the line- width command: "setline width scale factor (iw)" Line width param

Mathematical description of a perspective projection, Mathematical descript...

Mathematical description of a Perspective Projection A perspective transformation is found by prescribing a center of projection and a viewing plane. Let here assume that P(x

Essential elements for the raster scan display, Essential Elements for the ...

Essential Elements for the Raster Scan Display Three elements are essential for the raster scan display. They are as: 1) The Frame Buffer that is also termed as the Refresh

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