How to Create a Transparent Animated Circle Drawing with Rounded Corners: A CSS Solution?

Animating Circle Drawing with Rounded Corners and Transparency

As you've encountered, overlaying elements while maintaining a transparent background can be challenging when using border-radius and masks to create the illusion of a drawn circle.

In your code, the blue background in the ".background" class is obstructing the transparency you're trying to achieve. To address this, let's explore an alternative solution that incorporates both transparency and the desired animation.

Solution

We'll use a combination of elements and CSS to create the effect:

1. Body Background: Set a repeating-linear-gradient background to the body element to provide a visually transparent canvas.
2. Container: Define a parent container ("#container") with a solid red border for visualization purposes, and position it absolutely.
3. Half-Circle Clip: Create an element ("#halfclip") that will clip the half-circle. Set its width to 50%, height to 100%, position it on the right, and hide any content outside the clip.
4. Clipped Half-Circle: Within the clip, place a half-circle ("#clipped") with a blue border and a transparent background. Animate it to rotate, simulating the drawing motion.
5. Fixed Half-Circle: Add a fixed half-circle ("#fixed") over the clipped half-circle. Rotate it to the desired start position (-45deg) and animate it to fade in at the appropriate time, completed the drawn circle effect.

By configuring the animations carefully, we can achieve the effect of drawing a transparent circle with rounded corners. Feel free to adjust the colors, timings, and other parameters to fit your specific needs.

Additional Notes

• The "clip-path" property could be useful for achieving a similar effect with cleaner HTML.
• You might encounter browser compatibility issues with certain animations, so test thoroughly across different browsers.

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