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<p><span style="color: #000000;">Hi Gabriel,</span></p>
<p><span style="color: #000000;">Yes - this is possible - but it is a bit hard to find.</span></p>
<p><span style="color: #000000;">I will try to explain (and yes, this would need improvements in the digitizing chapter of the QGIS manual).</span></p>
<p><span style="color: #000000;"><span style="font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">Steps:</span><span style="font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;"> </span></span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">1. Enable Snapping on your active layer</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">2. Enable "Self Snapping"</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">3. Press the "Add Polygon Feature" button (but don't yet digitize)</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">4. Enable "Advanced Digitizing"</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">5. In the "Advanced Digitizing" panel select the angles you want to snap to</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">6. Start digitizing by pressing the left mouse button and adding the first segment with the second click</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">7. Add any additional segments by staying with the new segments within the angle tolerance in order to get new segments with proper right angles</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">8. If you want to close: first press "Alt-A" to fix the angle. Second: go to your initial start point and snap to it with the Left Mouse Button</span></p>
<p><span style="color: #000000; font-family: Roboto, Noto, sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; display: inline !important; float: none;">9. Press "Right Mouse button" to finish editing the polygon</span></p>
<p><span style="color: #000000;">Here is a Video demonstrating the steps: <a style="color: #000000;" href="https://www.youtube.com/watch?v=JimwOpN8dOU">https://www.youtube.com/watch?v=JimwOpN8dOU</a> (sorry about my voice, I don't have a radio voice ;-) )</span></p>
<p>As others have pointed out, you can uses the different "Add Rectangle" modes in the "Shape Digitizing Toolbars", e.g. "Add Rectangle from 3 points".</p>
<p><span style="color: #000000;">Hope this helps,</span></p>
<p><span style="color: #000000;">Andreas</span></p>
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<p id="reply-intro">On 2021-05-05 20:38, Gabriel Cotlier wrote:</p>
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<div dir="ltr">Hello,
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<div>I'm digitizing a square using the advanced digitizing tool, however when I'm about to close the rectangle's last angle, the tool doesn't offer me to see how to close it with a perfect square angle at the last click. Thus cannot finish the figure as a perfect square (four 90 degree angles).</div>
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<div>How can I perform the square with the 4 perfect 90 degree angles using the digitizing tool?</div>
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<div>Thanks a lot for your help.</div>
<div>Kind regards,</div>
<div>Gabriel</div>
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