Basic geometric algorithms for use with graphic input
Conference
·
OSTI ID:6773495
When a user positions the cursor on the screen of a graphics terminal, it is usually easy for a program to obtain the coordinates. Translating those into useful action is harder. Often, the program must find the data point or line nearest to the cursor, or determine whether a point is inside some polygon. These geometric relationships seem simple, but algorithms for evaluating them often are not obvious. This paper presents a collection of useful techniques, and discusses how they can be used to graphically control functions like identifying points, picking subsets, and zooming a plot.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6773495
- Report Number(s):
- PNL-SA-12161; CONF-8405194-1; ON: DE84013256
- Country of Publication:
- United States
- Language:
- English
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