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var selection = (function(){
var selection = new Matrix (1, 1, function(x,y){
var lex = new Lex (x,y)
lex.build()
return lex
})
// in selection mode..
// - we start by clicking the canvas. this positions the selection, and copies
// the character
// - then we drag down and to the right. this resizes the selection and pushes new
// rows and columns. each of these copies the character underneath.
// - on mouseup, the selection is locked. then..
// - drag the selection to move it -- this "cuts" it and leaves a blank space on the canvas.
// - shift-drag the selection to copy it
return selection
})()
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