Basic HTML version of Foils prepared 13 July 98

Foil 55 Rotation About a Point

From Java Academy II:Advanced Java NPAC/ECS Java Academy -- February to April 98. by Tom Scavo
1 To rotate a polygon about an arbitrary point p, we must do the following:
  • translate the origin to point p
  • rotate each vertex of the polygon
  • translate back to original coordinates
2 So rotation of polygons boils down to rotations of points about the origin
3 Unfortunately, the Point class is of no help!
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