Potentially entering and leaving points - clipping, Computer Graphics

Potentially entering and leaving points - PE and PL

The intersection point of the line and window might be classified either like potentially leaving or entering. Before get further details, we describe the real meaning of potentially leaving and entering points (PL and PE). Potentially leaving and entering points are dependent upon the edge orientation, that is: direction. So now understand how to determine PE and PL; here we move anticlockwise across the window boundary then area of left hand side encloses the window.

1928_Potentially entering and leaving points - Clipping.png

Figure: (a): Potentially Entering PE and Potentially Leaving PL points

So here, we are moving from point P to point Q, and we understand that whereas traversing the windows edges in anticlockwise method the area lying on the left hand side is considered to as the window region. Consequently, from the Figure (a) in above, you may see that at point PE that we are moving from P to Q we are entering the window region, hence this point of intersection should be considered to as the potentially entering point (PE). Now, consider to the other intersection demonstrated in the Figure (a) in above, this time, also the movement of points on the line are found by varying value of parameter t is from point P to Q and  with respect to, the orientation of window boundary, we are leaving the window area. Therefore, this point of intersection is identified as potentially exiting point (PL).

PE that is potentially entering point while moving indirection of the window, the point of intersection among line PQ and the window edges faced are identified as potentially entering. PL that is potentially leaving point; these are the point of intersection encountered whereas we move away from window.

Posted Date: 4/3/2013 3:21:51 AM | Location : United States







Related Discussions:- Potentially entering and leaving points - clipping, Assignment Help, Ask Question on Potentially entering and leaving points - clipping, Get Answer, Expert's Help, Potentially entering and leaving points - clipping Discussions

Write discussion on Potentially entering and leaving points - clipping
Your posts are moderated
Related Questions
How to utilize illumination model to calculate vertex intensity: For such we interpolate intensities beside the polygon edges, for all scan line the intensity at the intersecti

Simulation: There are several things, places and events people cannot witness in first person. There are a lot of causes for this. Several may happen too rapidly, several may be t

1.   Distinguish among Scan line polygon fill and Seed fill or Flood fill algorithm? Scan Line Polygon Flood Fill Algorithms ?1. This

Question 1 What is Multimedia? Explain sound multimedia element Question 2 Explain any three elements of drawings Question 3 Explain any three types of drawing Quest

Points and Lines - Graphic primitives In the previous section, we have seen to draw primitive objects; one has to firstly scan convert the objects. This concern to the operat

Write short notes on Text generation.   OR Character Generation Techniques  Character Generation Techniques   Two different representations are used for storing computer fon

Advantages of the Boundary Representation (i) This format gives efficient picture generation and easy access to other geometric information. (ii) The changes produced by mos

Please guide if there is any easy steps tutorial available for digital painting in adobe photoshop.

Obtain an MRI image using the Open Source internet resources. i. Read the image into Scilab ii. Plot the image iii. Covert it into grayscale image and plot it iv. Find/

when dda algorithm is more efficient than bresenhem line drawing algorithm