Circle
Renders a Circle/Ellipse onto a layer with powerful point controls, shape, and alpha options.

Points Control Determines what effect the points have on the circle
From In Radius mode, the center of the circle. In Diameter mode, the edge.
To The opposite edge of the from point.
Softness The amount of falloff at the outside edge of the circle/ellipse.
Contract / Expand Grows/Shrinks the current shape while maintaining its properties.
Linear Falloff Option to use linear falloff. Generally, the default falloff looks better.
Mode How the circle/ellipse is rendered. Choose from Cutout, Reveal, Mattes, or Color.
Color When Mode is set to Color, the color of the circle/ellipse.
Use Layer Alpha When checked, the current layer's alpha is retained.
Squash Turns a circle into an ellipse.
Angle Rotates the circle/ellipse.
Points Determine 0˚ Auto-rotates the shape based on the location of the control points. The Angle control can be used on top of the auto-rotation.
Offset Offsets the circle/ellipse
Opacity Controls the opacity of the circle/ellipse.