2 types of line clipping algorithm with example. Cohen-Sutherland Line Clipping and Liang-Barsky Line Clipping Algorithm By Shilpa. Liang-Barsky line clipping algorithm. ▫ Sutherland-Hogeman polygon clipping. 3. Pedher Johansson. Department of Computing Science, Umeå University. Liang – Barsky line clipping algorithm is faster line clipper algorithm based on analysis of the parametric equation of a line segment. Parametric equation of line .

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Engineering in your pocket Download our mobile app and study on-the-go. The Liang-Barsky line clipping algorithm in a nutshell!

Liang–Barsky algorithm

Parametric equation of line segment: Sign up using Facebook. Explain Liang Barsky line clipping algorithm.

Okay, now we’re ready to start.

Thus we would scrap everything don’t draw the line! Using these equations Cyrus and Beck developed an algorithm that is brsky more efficient than the Cohen Sutherland algorithm. Since we don’t have LaTeX markup in this exchange, I’ll use bold to represent n-dimensional vectors. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms narsky Service.

In the Liang-Barsky approach we first the point clipping condition in parametric form: It was created after I went through torture trying to research it myself for my uni course. Maybe try out Computer Graphics Stack Exchange computergraphics.

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White onwards other than the code which you can freely use. If the line is parallel to the X axis, for example then p1 and p2 must be zero.

Our hyperrectangle can be defined by two vectors, Least and Greatestexpressing the least and greatest values covered along each axis. Liang — Barsky line clipping algorithm is faster line clipper algorithm based on analysis of the parametric equation of a line segment. Sign up or log in Sign up using Google. More values need calculating for our first check: We can store these values in variables, as we will need to adjust them as the algorithm progresses.

Well, we’ve outdone ourselves again, and present you with the easiest tutorial to the Liang Barsky line clipping algorithm on the whole net! Anyway, if this is the case which it is for uswe do this check: To add a little context for those algrithm, the Liang-Barsky algorithm determines the segment of an infinite straight line that intersects an axis-aligned rectangle, if any.

Liang-Barsky Line Clipping Algorithm – Game Development Stack Exchange

Vogler Dec 6 ’15 at At Skytopia, we pride ourselves in making some of the most difficult concepts as easy to understand as possible. There are slight differences though.

Diagram 1b Just for reference, remember that: Amount you wish to contribute:. Amount you wish to contribute: Post as a guest Name. These two Xdelta and Ydelta are the most frequently used throughout the whole algorithm, so get them stuck into your brain: Now you’ve practically understood the whole algorithm because we can generalize what we’ve done for the left edge, to the other edges!


We hope you agree that the colour coding, examples, clopping diagrams pixel-precise and to scale!

Liang–Barsky algorithm – Wikipedia

Bqrsky reality of course, this would only apply if the line was fully inside the lighter blue area. Home Questions Tags Users Unanswered. Diagram 1 GOAL – Clip line to the inside of the lighter blue area To begin with, we assume that we want to draw the whole line.

Post Your Answer Clippong By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. So we ignore it.

It basically avoids wlgorithm unnecessary calculations if the line was already completely inside the edges to start with: So the beginning of the line P 0 will be represented by 0and the end of the line P 1 by 1.

Download our mobile app and study on-the-go. Diagram 1b Left edge check: