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2D Object Definition--1

Lines and Polylines

• Lines drawn between ordered points to create more complex forms called polylines
  
  

• First and last point the same make closed polyline or polygon

• Can intersect itself--if not, is called simple

Convex vs. Concave Polygons

• Convex: For every pair of points in the polygon, the line between them is fully contained in the polygon.

• Concave: Not convex. So some two points in the polygon are joined by a line not fully contained in the polygon.

Geometric Transformations - 09 MAY 95

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