By default, the RotateAngle property is 0 degree ( which indicates that the layer is shown as it is ). The RotateAngle property specifies the current angle of the rotation of the specified layer. The DeltaAngle property specifies the angle (in degrees) that has been rotated the layer/object, during the drag operation. The CumulativeRotateAngle property specifies the cumulative rotation angle, during the dragging operation. The Change event occurs when the layer's RotateAngle property is changed. The DragStart / Drag / DragEnd events notify your application when a layer is dragged. Change the Debug property of the DragInfo during the DragStart event to debug the rotation angles. Use the DefaultLayer(exDefLayerRotateAngle) property to specify the default value for the RotateAngle property, before adding any layer. The RotateType property specifies whether the layer's rotation is performed fast, by shearing ( high quality rotation ), ... 

The following picture shows the rotation properties of the Layer, relative to the RotateCenterLayer layer:

Any of the following properties can be used to rotate the layer:

• DefaultRotateAngle, specifies the default angle to rotate the layer.
• RotateAngle, specifies the angle to rotate the layer.
• RotateAngleValid, validates / limits the rotation angle of the layer.
• Value and ValueToRotateAngle, specifies the expression to convert the value to rotating angle. The RotateAngleToValue converts the current rotation angle to a value.

The following properties can be used to specify a different rotation center:

• RotateCenterLayer, indicates the index of the layer the rotation is around.
• RotateCenterX, indicates the expression that determines the x-origin of the rotation point relative to the RotateCenterLayer layer.
• RotateCenterY, indicates the expression that determines the y-origin of the rotation point relative to the RotateCenterLayer layer. 

The following properties can be used to change the rotation center, while the layer's OnDrag property is exDoRotamove:

• RotamoveCenterX, specifies the x-position of the layer's center.
• RotamoveCenterY, specifies the y-position of the layer's center. 
• RotamoveOffsetX,  specifies the x-offset of the layer.
• RotamoveOffsetY, specifies the y-offset of the layer.