表达式16: "B" Subscript, "x" , Baseline left parenthesis, "t" , right parenthesis equals left parenthesis, 1 minus "t" , right parenthesis cubed "c" Subscript, 1 , Baseline plus 3 "t" left parenthesis, 1 minus "t" , right parenthesis squared "c" Subscript, 2 , Baseline plus 3 "t" squared left parenthesis, 1 minus "t" , right parenthesis "c" Subscript, 3 , Baseline plus "t" cubed "c" Subscript, 4 , Baseline left brace, 0 less than "t" less than or equal to 1 , right braceBxt=1−t3c1+3t1−t2c2+3t21−tc3+t3c40<t≤1
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表达式17: "B" Subscript, "y" , Baseline left parenthesis, "t" , right parenthesis equals left parenthesis, 1 minus "t" , right parenthesis cubed "v" Subscript, 1 , Baseline plus 3 "t" left parenthesis, 1 minus "t" , right parenthesis squared "v" Subscript, 2 , Baseline plus 3 "t" squared left parenthesis, 1 minus "t" , right parenthesis "v" Subscript, 3 , Baseline plus "t" cubed "v" Subscript, 4 , BaselineByt=1−t3v1+3t1−t2v2+3t21−tv3+t3v4
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This plots the curve:
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表达式19: left parenthesis, "B" Subscript, "x" , Baseline left parenthesis, "t" , right parenthesis , "B" Subscript, "y" , Baseline left parenthesis, "t" , right parenthesis , right parenthesisBxt,Byt
定义域t最小值： 00
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 11
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This folder draws 'control handles' to illustrate how the curve is influenced by the control points
