tikz过一点作一直线的垂线，怎么在交点处（D点的位置）添加垂足符号呢？

begin{tikzpicture} draw[help lines](0,0)grid(3,2); coordinate(a)at(0,1); coordinate(b)at(3,2); coordinate(c)at(2.5,0); coordinate(e)at($(a)!(c)!(b)$); draw[blue](c)--($(a)!(c)!(b)$); node[left](a)at(0...

tikz过一点作一直线的垂线，怎么在交点处（D点的位置）添加垂足符号呢？

begin{tikzpicture} draw[help lines](0,0)grid(3,2); coordinate(a)at(0,1); coordinate(b)at(3,2); coordinate(c)at(2.5,0); coordinate(e)at($(a)!(c)!(b)$); draw[blue](c)--($(a)!(c)!(b)$); node[left](a)at(0...

tikz过一点作一直线的垂线，怎么在交点处（D点的位置）添加垂足符号呢？

begin{tikzpicture} draw[help lines](0,0)grid(3,2); coordinate(a)at(0,1); coordinate(b)at(3,2); coordinate(c)at(2.5,0); coordinate(e)at($(a)!(c)!(b)$); draw[blue](c)--($(a)!(c)!(b)$); node[left](a)at(0...

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