Steps for clip a line segment-pq, Computer Graphics

Assignment Help:

Steps for clip a line segment-PQ

  • Initially, find all the points of intersections of the line segment PQ along with the edges of the polygonal window and describe them either as PE and PL points. Also find out the value of parameter t, by using equation (2) for respective PE's and PL's.

                                                            Or

If value of the normal to particular edges is not specified then, determine the value of normal to every edge of the window, then find out the value of parameter t, by using equation (2) for particular point of intersection among line segment and window edge then on the basis of the value of parameter t mark them like PE and PL given the value of t lies from 0 to 1 in magnitude.

  • Secondly, out of the diverse values of t for PE's find out the maximum value of t say it is tmax. Likewise, out of the diverse values of t for PL's find out the minimum value of t say it be tmin . Remember here that for clipping to be possible tmin > tmax.
  • at last, vary the parameter t from tmax to tmin and find out the clipped line as outcome.

For well understanding of steps here figure is shown below:

2071_Steps for clip a line segment-PQ.png

Figure: Steps of Cyrus Beck Clipping

During in case of Line 1: (PQ)

1) Point 1 is potentially entering (PE1) since as we move along PQ, the LHS of e1 is window and hence, it seems that we are entering the window.

2) Point 2 is again PE2 same as point 1.

3) Point 3 is potentially leaving (P4) ? as we move along PQ, the LHS of e2 is window and hence, it seems that we are leaving the window.

4) As the same, point 4 is also PL2.

Line 2 and 3 (PQ):

By using similar logic as for line 1 we determine p‾L and PE. Here, it is to be noted that for all points of intersection we have several value of t.

Say t1 is value of t for PE1

Say t2 is value of t for PE2

Say t3 is value of t for PL1

Say t4 is value of t for PL2


Related Discussions:- Steps for clip a line segment-pq

Describe transformation, What is Transformation?  Transformation is the...

What is Transformation?  Transformation is the process of introducing changes in the shape size and orientation of the object using scaling rotation reflection shearing & trans

Three dimensional display methods - 2d clipping algorithms, Three dimension...

Three dimensional display methods: Among the simplest three dimensional surface representations are the polygonal surfaces.  A polygonal surface is described by vertices

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

Proof of subsequent properties of bezier curves, Proof of subsequent proper...

Proof of subsequent properties of Bezier curves Note: Proof of subsequent properties of Bezier curves is left as a work out for the students P' (0) = n (p 1 - p 0 ) P

Mpeg-2 , MPEG-2 : MPEG-2 that is Moving Picture Experts Group format 2 is ...

MPEG-2 : MPEG-2 that is Moving Picture Experts Group format 2 is the standard used through DVD and is of a much higher quality than MPEG- 1. This format gives for 720 x 480 resolu

Applications that can handle vector data, Applications that can handle Vect...

Applications that can handle Vector Data There are hundreds of applications under the market which can be used to modify or make vector data. In prepress: Adobe Illustrator, Ma

Region filling, what is region filling? give details

what is region filling? give details

Graphical User interface and interactive input methods, all details of Grap...

all details of Graphical User interface and interactive input methods

Relation between polar coordinate and cartesian system, Relation between po...

Relation between polar coordinate system and Cartesian system A frequently utilized non-cartesian system is Polar coordinate system. The subsequent figure A demonstrates a pol

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