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The following range of options is available for capping and joining:
JOIN_MITER: Extend outside
edges until they meet at a point.
JOIN_BEVEL: Extend outside edges,
but trim off point.
JOIN_ROUND: Round off outside
edges smoothly.
CAP_ROUND: Terminate with round
end.
CAP_BUTT: Terminate with square end.
CAP_SQUARE: Terminate with square
end that projects one-half of the width of the line beyond the terminal
coordinates.