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We study new types of geometric query problems defined as follows: given a geometric set P , preprocess it such that given a query point q, the location of the largest circle that does not contain any member of P , but contains q can be reported efficiently. The geometric sets we consider for P are boundaries of convex and simple polygons, and point sets.… (More)

- Arindam Karmakar, Sasanka Roy, Sandip Das
- CCCG
- 2007

Here we propose an efficient algorithm for computing the smallest enclosing circle whose center is constrained to lie on a query line segment. Our algorithm prepro-cesses a given set of n points P = {p 1 , p 2 ,. .. , p n } such that for any query line or line segment L, it efficiently locates a point c on L that minimizes the maximum distance among the… (More)

- Sasanka Roy, Sandip Das, Subhas C. Nandy
- Comput. Geom.
- 2005

Given a polyhedral terrain with n vertices, the shortest monotone descent path problem deals with finding the shortest path between a pair of points, called source (s) and destination (t) such that the path is constrained to lie on the surface of the terrain, and for every pair of points p = (x(p), y(p), z(p)) and q = (x(q), y(q), z(q)) on the path, if… (More)

- Sasanka Roy, Arindam Karmakar, Sandip Das, Subhas C. Nandy
- Comput. Geom.
- 2006

- Sasanka Roy, Partha P. Goswami, Sandip Das, Subhas C. Nandy
- SWAT
- 2002

We investigate a special class of map labeling problem. Let P = fp1; p2; : : : ; png be a set of point sites distributed on a 2D map. A label associated with each point is a axis-parallel rectangle of a constant height but of variable width. Here height of a label indicates the font size and width indicates the number of characters in that label. For a… (More)

- Prosenjit Bose, Stefan Langerman, Sasanka Roy
- CCCG
- 2008

Given a set of n points P = {p 1 , p 2 ,. .. , p n } in the plane, we show how to preprocess P such that for any query line segment L we can report in O(log n) time the smallest enclosing circle whose center is constrained to lie on L. The preprocessing time and space complexity are O(n log n) and O(n) respectively. We then show how to use this data… (More)

- Mustaq Ahmed, Sandip Das, Sachin Lodha, Anna Lubiw, Anil Maheshwari, Sasanka Roy
- J. Discrete Algorithms
- 2010

A path from s to t on a polyhedral terrain is descending if the height of a point p never increases while we move p along the path from s to t. No efficient algorithm is known to find a shortest descending path (SDP) from s to t in a polyhedral terrain. We give two approximation algorithms (more precisely, FPTASs) that solve the SDP problem on general… (More)

In the map labeling problem, we are given a set P = {p 1 , p 2 ,. .. , p n } of point sites distributed on a 2D map. The label of a point p i is an axis-parallel rectangle of specified size. The objective is to label maximum number of points on the map so that the placed labels are mutually non-overlapping. Here, we investigate a special class of map… (More)

- Sasanka Roy, Sachin Lodha, Sandip Das, Anil Maheshwari
- CCCG
- 2007

A path from a point s to a point t on the surface of a polyhedral terrain is said to be descent if for every pair of points p = (x(p), y(p), z(p)) and q = (x(q), y(q), z(q)) on the path, if dist(s, p) < dist(s, q) then z(p) ≥ z(q), where dist(s, p) denotes the distance of p from s along the aforesaid path. Although an efficient algorithm to decide if there… (More)