Fill tool

The Fill tool can be found on the Toolbar. Its symbol is a spilling bucket of paint, and it is used to fill in areas, or apply a style change to areas or lines.

Fill Depth
This setting determines how transparent a pixel must be in order to be treated as empty space available to be filled. Increasing the minimum will cause more semitransparent pixels to be treated as empty when it comes to filling, while decreasing it will cause more to be treated as colored in. Pixels treated as colored in will count as solid for the purpose of determining a fill area's boundary.

Shift + click to use the maximum fill depth you've set on the slider instead of the minimum.

Type
This allows the user to change how they select the area the Fill applies to.
 * "Normal" allows you to fill by clicking once in the area you want to paint.
 * "Rectangular" is a rectangular selection tool. "Freehand" allows you to draw any shape you want. Only bounded areas completely contained within the selection will be filled, so it won't matter if you accidentally select outside the lines.
 * "Polyline" allows you to create your own bounded shape with connected lines. Click to place a straight line. Click and hold to make a curved line. To close the shape, connect a line to the circle that marks where you started from.

Mode
Switches between applying the style to lines, areas, or both lines and areas.

Selective checkbox
When enabled, this limits the tool to filling empty areas only, even if the selection encompasses an area that has already been filled with a different style.

Frame Range checkbox
This allows the user to quickly fill in an area shared throughout a range of frames. To use it: This can also be used with the different fill type settings (above) to quickly fill more complicated areas. For Rectangular, Freehand, and Polyline fill type settings, you should select the area to be filled as you normally would with those options. Other than that, the Frame Range fill feature works identically.
 * 1) Select the style you want to use. Fill in the area in the first frame.
 * 2) Click once in the center of the filled area in the first frame. A red X will appear to mark where you've clicked.
 * 3) Click in the same area in the last frame.