Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: BaseDraw
DOODLEOBJECT_BD
Parameter: Current Image
DOODLEOBJECT_IMAGE
Parameter: New Frame
DOODLEOBJECT_ADDIMAGE
Parameter: Delete Frame
DOODLEOBJECT_DELIMAGE
Parameter: Clear Frame
DOODLEOBJECT_CLEARFRAME
Parameter: Set Viewport
DOODLEOBJECT_SETBD
Parameter: Load Bitmap
DOODLEOBJECT_LOAD_BITMAP
Parameter: Remove Unused
DOODLEOBJECT_REMOVE_UNUSED
Parameter: Export
DOODLEOBJECT_EXPORT
Parameter: Import
DOODLEOBJECT_IMPORT
Parameter: Export Format
DOODLEOBJECT_EXPORT_FORMAT
Parameter: Size X
DOODLEOBJECT_SIZE_X
Parameter: Size Y
DOODLEOBJECT_SIZE_Y
Parameter: Ghost Previous
DOODLEOBJECT_GHOST_PREV
Parameter: Ghost Next
DOODLEOBJECT_GHOST_NEXT
Parameter: Draw Smoothly
DOODLEOBJECT_SMOOTHVIEW
Parameter: Save Compressed
DOODLEOBJECT_SAVECOMPRESSED
Parameter: Current View
DOODLEOBJECT_CURRENTVIEW
Parameter: Title
DOODLEOBJECT_TITLE
Parameter: Description
DOODLEOBJECT_BODY