The document discusses 2D clipping and the Cohen-Sutherland clipping algorithm. 2D clipping identifies portions of an image inside or outside a clipping window region. Point clipping checks point coordinates against window bounds, while line clipping is more complex. The Cohen-Sutherland algorithm assigns region codes to line endpoints based on their position relative to the window and clips lines by successively calculating boundary intersections until the line is fully inside or outside the window.
Cohen-Sutherland Line Clipping Algorithm:
When drawing a 2D line on screen, it might happen that one or both of the endpoints are outside the screen while a part of the line should still be visible. In that case, an efficient algorithm is needed to find two new endpoints that are on the edges on the screen, so that the part of the line that's visible can now be drawn. This way, all those points of the line outside the screen are clipped away and you don't need to waste any execution time on them.
A good clipping algorithm is the Cohen-Sutherland algorithm for this solution.
By,
Maruf Abdullah Rion
Definition of Viewing & Clipping?
Viewing pipeline
Viewing the transformation system
Several types of clipping
Cohen-Sutherland Line Clipping
Application of Clipping
Conclusion
Cohen-Sutherland Line Clipping Algorithm:
When drawing a 2D line on screen, it might happen that one or both of the endpoints are outside the screen while a part of the line should still be visible. In that case, an efficient algorithm is needed to find two new endpoints that are on the edges on the screen, so that the part of the line that's visible can now be drawn. This way, all those points of the line outside the screen are clipped away and you don't need to waste any execution time on them.
A good clipping algorithm is the Cohen-Sutherland algorithm for this solution.
By,
Maruf Abdullah Rion
Definition of Viewing & Clipping?
Viewing pipeline
Viewing the transformation system
Several types of clipping
Cohen-Sutherland Line Clipping
Application of Clipping
Conclusion
he capability that show some part of object internal a specify window is called windowing and a rectangular region in a world coordinate system is called window. ... Points and lines which are outside the window are "cut off" from view. This process of "cutting off" parts of the image of the world is called Clipping.
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2. 2D CLIPPING
Any procedure which identifies that portion of a
picture which is either inside or outside a region
is referred to as a clipping algorithm or
clipping.
The region against which an object is to be
clipped is called clipping window.
3. 2D Clipping
Point clipping easy: Just check the inequalities
xmin < x < xmax
ymin < y < ymax
Line clipping more tricky
4. Cohen Sutherland clipping Algorithm
The Cohen–Sutherland algorithm is a computer
graphics algorithm used for line clipping
5. Cohen Sutherland clipping Algorithm
Every line endpoint is assigned a 4 bit Region code. The
appropriate bit is set depending on the location of the endpoint
with respect to that window component as shown below:
Endpoint Left of window then set bit 1
Endpoint Right of window then set bit 2
Endpoint Below window then set bit 3
Endpoint Above window then set bit 4
6. Cohen-Sutherland Line Clipping
To clip a line, find out which regions its two endpoints lie in.
If they are both in region 0000, then it’s completely in.
If the two region numbers both have a 1 in the same bit
position, the line is completely out.
Otherwise, we have to do some more calculations.
7. Cohen-Sutherland clipping algorithm
To clip a line, find out which regions its two endpoints lie in.
If they are both in region 0000, then it’s completely in.
If the two region numbers both have a 1 in the same bit
position, the line is completely out.
Otherwise, we have to do some more calculations.
8. Cohen-Sutherland Clipping Algorithm
For those lines that we cannot immediately
determine, we successively clip against each
boundary.
Then check the new endpoint for its region
code.
How to find boundary intersection: To find
y coordinate at vertical
intersection, substitute x value at the
boundary into the line equation of the line
to be clipped.