# Weiler Atherton Polygon Clipping Algorithm in Computer Graphics

source link:https://www.geeksforgeeks.org/videos/weiler-atherton-polygon-clipping-algorithm-in-computer-graphics/

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Weiler Atherton Polygon Clipping Algorithm in Computer Graphics

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- 23/09/2022

**Weiler Atherton Polygon Clipping Algorithm** is an algorithm that helps in clipping even concave algorithms to be possible. This algorithm clips the concave polygons without leaving any residue behind unlike Sutherland – Hodgman polygon clipping algorithm.

**Algorithm:**

Step 1: Select a list of all intersection points, for example, i1, i2, ……

Step 2: Make it as entering or exiting intersection points.

Step 3: From this, make two lists, for clipping and clipped polygon

Step 4: Make sure while filling both lists, the intersection points lie between the correct vertices of each polygon.

Step 5: Start the 'to be clipped' polygon's list.

Step 6: Select the first intersection point which is named as an entering point. Keep on pushing the points in the list into a vector and follow the list until an existing intersection point is found.

Step 7: Switch the list to the 'polygon that is clipping' list, and find the existing intersection which was encountered previously.

Step 8: Follow the points in this list until the entering intersection point is found.

Step 9: By pushing all the encountered points in the two lists, the vector now becomes the clipped polygon

Step 10: From step 5 Repeat this clipping procedure until all the entering intersection points are visited once.

**Weiler atherton polygon clipping algorithm:**

https://www.geeksforgeeks.org/weiler-atherton-polygon-clipping-algorithm/

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