About the Timeline
The Timeline's horizontal orientation is based off of modern digital animation and video editing. The compact size can allow more of your resources to be seen and can be more familiar.
The Timeline exposes specific frames from your levels (individual resource files) in horizontal layers. Each layer holds at least one level, though sometimes there may be more. In the Timeline, levels span horizontally across one or more cells. The more cells a level spans across, the longer the level exists in the animation.
Drawings in a level are sometimes displayed out of order in the Timeline. A single drawing may be utilized multiple times in the layer. Sometimes certain drawings in a level may not be exposed at all in the layer or scene.
The Timeline has an additional "Zoom in" or "Zoom out" capability to either contract or expand the cells of the Timeline horizontally. At its most compact, the Timeline is able to display signifigantly more cells without the need to scroll horizontally.
Visually, the cells in a single Timeline column (from each visible layer) are combined to form a single frame. When this happens, layers on the top are visually in front of layers on the bottom. Frames/cells/columns on the left of the Timeline take place at the beginning of the animation while frames/cells/columns at the end of the Timeline take place at the end of the animation.
About the Xsheet
The Xsheet and it's vertical orientation is based on traditional animation's exposure sheets. With the Xsheet view it is often easier to visually identify resources & to reorder them.
The Xsheet exposes specific frames from your levels (those individual resource files) in vertical columns. Levels span vertically across one or more cells, instead of horizontally. The more cells a level spans across, the longer the level exists in the animation.
Drawings in a level are sometimes displayed out of order in the Xsheet. A single drawing may be utilized multiple times in the column. Sometimes certain drawings in a level may not be exposed at all in the column or scene.
Visually, the cells in a single Xsheet row (from each visible column) are combined to form a single frame. When this happens, columns on the left are visually behind columns on the right. Frames/cells/rows at the top of the Xsheet take place at the beginning of the animation while frames/cells/rows at the bottom of the Xsheet take place at the end of the animation.