Reveal Path (Trim path)
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The reveal path property (also known as trim path) enables you to determine how much of your layer is 'revealed' or 'trimmed' off.
This is especially useful when used on a layer with a stroke to create fluid line animations, but can also be used on layers without strokes to create a cut-off effect.
The Reveal path property has three properties you can set, the 'sweep start', 'sweep end' and 'offset'
The sweep start trims (or hides) the shape in a clockwise motion ↻ (to the right) from the top-centre of the shape (if no offset is applied).
It ranges between 0% and 100%, and the higher its value, the more of the shape is trimmed in a clockwise direction.
A simple mental model is the closer to 100% this value is, the more the shape is hidden clockwise.
The sweep end trims (or hides) the shape in an anticlockwise motion ↺ (to the left) from the top-centre of the shape (if no offset is applied).
It starts at 100% and the lower its value, the more of the shape is trimmed in an anticlockwise direction.
A simple mental model is the closer to 100% this value is, the more the shape is revealed anti-clockwise.
The offset moves where the starting point for the trim is.
When offset is 0%, the shape is hidden/trimmed starting from the top-centre when sweep start or sweep end is changed.
When offset is a positive number, the starting point for the trim is moved clockwise ↻ by the given percentage.
When offset is a negative number, the starting point of the trim is moved anti-clockwise ↺/reversed by the given percentage.
