The Fill Inspector is used to control the color fill of shape, polygon, and text objects.
Whether or not an object has a fill type is toggled by the Fill checkbox.
An object can have one of three different color fills applied to it: Solid, Linear Gradient, or Radial Gradient.
When Solid is selected you can specify the fill color by clicking on the color well and choosing a color.
When Linear Gradient is selected you can specify two gradient colors, a primary and secondary, as well as the gradient angle. The primary and secondary colors can be specified by clicking on the respective color well and choosing a color. You can swap the primary and secondary gradient color by clicking the swap button between the two color wells.
The gradient angle can be changed by either entering an angle into the angle text field, or moving the rotation slider.
By holding down the shift key while moving the rotation slider you will change the gradient angle in 15º increments.
When Radial Gradient is selected you can specify two gradient colors, a primary and secondary, as well as the position of the gradient center. The primary and secondary colors can be specified by clicking on the respective color well and choosing a color. You can swap the primary and secondary gradient color by clicking the swap button between the two color wells.
The position of the gradient center can be changed by either clicking a spot in the center position well, or clicking and dragging the center marker around the position well. You will see the center marker change positions to represent the new center position. The white square inside the position well represents the bounds of the selected objects, with the horizontal and vertical lines representing the centerlines of the object bounds.
If you drag the center position marker towards the centerlines of the object bounds the marker will snap to the centerlines.