Ruby 1.8.7 リファレンスマニュアル > ライブラリ一覧 > tk/canvastagライブラリ > TkcTagAccessモジュール > &
self & tag
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Following operators support logical expressions of canvas tags (for Tk8.3+). If tag1.path is 't1' and tag2.path is 't2', then
ltag = tag1 & tag2; ltag.path => "(t1)&&(t2)" ltag = tag1 | tag2; ltag.path => "(t1)||(t2)" ltag = tag1 ^ tag2; ltag.path => "(t1)^(t2)" ltag = - tag1; ltag.path => "!(t1)"