Enum which describes the diagram image horizontal alignment.
| Enumerator | 
|---|
| HA_Left  | 
 The image is horizontally aligned on left.  
 | 
| HA_Center  | 
 The image is horizontally centered.  
 | 
| HA_Right  | 
 The image is horizontally aligned on right.  
 | 
| HA_Stretch  | 
 The image is horizontally stretched to whole bounding rectangle width.  
 |