視覺長度截斷函數

#長度的來源見附件中的html _visable_width=0, 24, 24, 24, 24, 24, 24, 24, 24, 0, 0, 0, 0, 0, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 12, 12, 16, 28, 28, 44, 32, 8, 16, 16, 20, 28,

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