title: How to draw square to tag an object. (React Native)
body: <p>I see many mobile apps having a feature that user can draw a square to indicate something to tag on the image.</p>
  <p>I'm building <code>Face Tagging</code> app and basically <strong>user draws square on the boundary of human's face on the image</strong>.</p>
  <p>I've Googled it many times but I'm not sure RN has some feature library for tagging.</p>
  <p>How can I achieve this? Is there any good library to <strong>draw square on image?</strong> And it will be even better if I can remember its coordinate width, height, and position of the rectangle.</p>
  <p>Any idea or suggestion will be highly appreciated!</p>
  <p>This is an example below</p>
  <p><a href="https://i.stack.imgur.com/nDtCs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nDtCs.png" alt="enter image description here" /></a></p>