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基本
st=>start: 开始
e=>end: 结束
op1=>operation: 获取鼠标点击位置
sub1=>subroutine: 继续点击
cond=>condition: 两个点及以上
io=>inputoutput: 拟合直线
st->op1->cond
cond(yes)->io->e
cond(no)->sub1(right)->op1
升级
st=>start: 开始
e=>end: 结束
n=>no: 否
op1=>operation: 获取鼠标点击位置
sub1=>subroutine: 继续点击
sub2=>subroutine: 继续监听
cond=>condition: 三个点及以上
cond1=>condition: 拟合曲线
st->op1->cond->cond1
cond(yes)->cond1->e
cond(no)->sub1(right)->op1
cond1(no)->sub1(right)->op1
cond1(yes)->e