title: cannot draw proper position on transformed SVG
body: <p>I know I can free draw on a non scaled SVG group. But after I scaled the group, the drawing position is not following my mouse position properly.</p>
  
  <p>example if I zoom out my svg group 1.3 times bigger, see below
  <a href="https://i.stack.imgur.com/SyQDS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SyQDS.png" alt="enter image description here"></a></p>
  
  <p>I have a transformed matrix applied to the group.</p>
  
  <p>my question is how to solve the position on the scaled group to follow my mouse position?</p>
  
  <p>Regards,
  JX</p>