What are main steps in Cohen-Sutherland line clipping?

What are main steps in Cohen-Sutherland line clipping?

Pseudocode

• Step 1 : Assign a region code for two endpoints of given line.
• Step 2 : If both endpoints have a region code 0000 then given line is completely inside and we will keep this line.
• Step 3 : If step 2 fails, perform the logical AND operation for both region codes.
• Step 4 : Repeat step 1 for all lines.

What are the advantages of Cohen-Sutherland line clipping algorithm?

Advantage of Cohen Sutherland Line Clipping:

• It calculates end-points very quickly and rejects and accepts lines quickly.
• It can clip pictures much large than screen size.

What is 2D line clipping?

Clipping is a process that subdivides each element of a picture to be displayed into its visible and invisible parts, thus allowing us to discard the invisible parts of the picture. In 2D, the clipping process can be applied to a variety of graphics primitives such as points, lines, polygons and curves.

Which algorithm is used for line clipping?

Cohen–Sutherland algorithm
In computer graphics, the Cohen–Sutherland algorithm (named after Danny Cohen and Ivan Sutherland) is a line-clipping algorithm. The algorithm divides a 2D space into 9 regions, of which only the middle part (viewport) is visible.

What are the limitations of Cohen Sutherland line clipping algorithm?

Limitations of Cohen-Sutherland clipping algorithm

• Clipping window region can be rectangular in shape only and no other polygonal shaped window is allowed.
• Edges of rectangular shaped clipping window has to be parallel to the x-axis and y-axis.

Which is best line clipping algorithm?

Cohen-Sutherland Line Clipping Algorithm : It is a line clipping algorithm. In which 2-D space (in which line resides) is divided into 9 regions and then the lines and portions of lines which are visible in the central region of interest are determined efficiently.

How many types of line clipping are there?

There are five primitive types clipping, such as point, line, polygon or are, curve and text clipping. Classical line clipping algorithms includes Cohen–Sutherland algorithm, Midpoint Subdivision algorithm, Liang Bearsky and Nicholl-Lee-Nicholl algorithm.

What is point clipping algorithm?

So, clipping is a procedure that identifies those portions of a picture that are either inside or outside of our viewing pane. In case of point clipping, we only show/print points on our window which are in range of our viewing pane, others points which are outside the range are discarded.

What is Liang Barsky line clipping algorithm?

Barsky) is a line clipping algorithm. The Liang–Barsky algorithm uses the parametric equation of a line and inequalities describing the range of the clipping window to determine the intersections between the line and the clip window. With these intersections it knows which portion of the line should be drawn.

What are the types of clipping algorithm?

Which is the algorithm used for line clipping?

From Wikipedia, the free encyclopedia The Cohen–Sutherland algorithm is a computer-graphics algorithm used for line clipping. The algorithm divides a two-dimensional space into 9 regions and then efficiently determines the lines and portions of lines that are visible in the central region of interest (the viewport).

How is the outcode computed for two dimensional clipping?

An outcode is computed for each of the two points in the line. The outcode will have 4 bits for two-dimensional clipping, or 6 bits in the three-dimensional case. The first bit is set to 1 if the point is above the viewport. The bits in the 2D outcode represent: top, bottom, right, left.

What is the 4 bit code for line clipping?

As you seen each region is denoted by a 4 bit code like 0101 for the bottom right region Four Bit code is calculated by comparing extreme end point of given line (x,y) by four co-ordinates x_min, x_max, y_max, y_min which are the coordinates of the area of interest (0000)

How to clip a line with a region code 0000?

Step 1 : Assign a region code for two endpoints of given line. Step 2 : If both endpoints have a region code 0000 then given line is completely inside. Step 3 : Else, perform the logical AND operation for both region codes. Step 3.1 : If the result is not 0000, then given line is completely outside. Step 3.2 : Else line is partially inside.