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Alternatively, head back to the guide overview on the getting started page.
The main purpose of the timeline is to create custom animations using keyframes.
Timelines are a more advanced topic but for simple animations using the default brushes you generally don't need to use one.
There are a few bullet points that are important to remember getting in to timelines
The timeline allows you to change the value of one or more properties over time. The way this is done is by giving a property multiple values at different points in time, these values are called keyframes. When the timeline plays Artemis smoothly follows these keyframes, resulting in an animation.
The timeline is split up into separate rails. Each property has its own rail and on these rails you can place keyframes. Because of this, you'll be using the properties panel and the timelines panel together a lot.
In the image above you'll see that keyframes are enabled for the Position, Scale and Rotation properties. This was achieved by clicking the -icon in front of each property.
After enabling keyframes, a new keyframe is added right away. Each keyframe is shown on the timeline using circle like this one: .
You can drag these around to change their position. The position of your keyframes the start, end and speed of the animation.
Changing the value of a property which has keyframes enabled adds a new keyframe at the current position of the timeline cursor.
Collapsing a property will also collapse the rails, causing all keyframes to be consolidated into a single rail which you cannot edit.
To learn about the timeline and keyframes, see the timeline guide and more specifically the keyframes guide.