Bézier curves have been a recurring theme in my frontend engineering career. I have used them extensively in my work - in animations and SVG paths of illustrations and icons. However, I only recently took an interest in understanding the underlying logic that governs their behaviour. This demystified curve-related path commands for me and gave me a deeper understanding of web animations. In this article, I’ll share my interesting findings on Bézier curves.
In CSS animations, easing functions specify the rate of change of a property over time. There are 3 types of easing functions - Linear, Step and Cubic Bézier.
Linear is typically used to animate properties at a constant rate/speed.
Step is used to animate properties at equal time intervals.
Cubic Bézier Easing
Cubic Bézier is used to animate properties at variable rate/speed.
Predefined CSS easings like
ease-in-out as well as commonly used smooth easings like ease in sine and ease in cubic are examples of cubic Bézier easing functions. Custom easings can also be generated with cubic Bézier easing functions.