How to Create a Seamlessly Drawn Circle Animation in CSS Without Revealing the Mask?

How to Animate Drawing a Circle without Hiding Mask

Problem:

Attempting to create an animation of a circle being drawn with CSS. The circle is created with border-radius and set to rotate, giving the illusion of drawing. However, overlaying elements over the circle and setting its background to transparent reveals the mask that hides the unrotated half of the circle.

Solution:

To make the circle background transparent without revealing the mask:

1. Set a background on the body element to show transparency.
2. Create a container (#container) and a #halfclip div inside.
3. Position #halfclip absolutely to the right of the container.

4. Add the rotating half-circle (#clipped) inside #halfclip with overflow: hidden.

   • This creates a clipping mask that hides the unrotated portion of the circle.

5. Add another fixed half-circle (#fixed) inside the container.

   • This half-circle is used to fill the remaining space and create the illusion of a drawn circle.
6. Animate the #clipped half-circle to rotate.
7. Animate the #fixed half-circle to appear gradually.

With this setup, the circle will appear to be drawn as it rotates, while the transparent background allows elements to be overlaid without revealing the mask.

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