From inside to outside, the gradient begins with the Start Color and blends into the End Color in a circular pattern.
Select a color from the Color Picker by clicking on the colored box next to Start Color or End Color, or by entering the hexadecimal value in the text box. You can also be adjust the transparency of the color with the slider to the left of the text box.
By default, the Pattern is set to No Cycle, which displays a single gradient circle. However, you may elect to use the Reflect pattern, which uses a series
of concentric circles to fill the entire object following an alternating pattern of inside-to-outside and outside-to-inside from the center. Or you may choose to use the Repeat pattern, which also uses a series of concentric circle to fill the entire object but utilizes the inside-to-outside pattern for each circle.
The Focus Point of the circular gradient is by default the center of the object, which is represented by the values (0,0). You can change the focus of the gradient to any location within the object by changing the values. Valid entries are between -1 and 1 in 0.001 increments. Manipulating the Focus Point along with the Pattern will produce a variety of interesting results.