This method modifies the ConstrainedSketchOptions                     object.
Optional arguments
- imageName
 
A String specifying the name of the image.  A list of valid image names is in the images                     repository in the session                     object.
 
- showImage
 
A Boolean specifying whether an image should be displayed in the sketcher background. The default value is OFF.
 
- origin
 
A pair of Floats specifying the X- and Y-offsets in millimeters from the lower-left corner of the viewport.                    The default value is (0, 0).
 
- xScale
 
A Float specifying the scale applied to the image width. The default value is 1.0.
When xScale                  is negative, the image is mirrored about its y-axis but its position is not affected.
 
- yScale
 
A Float specifying the scale applied to the image height. The default value is 1.0.
When yScale                  is negative, the image is mirrored about its x-axis but its position is not affected.
 
- translucency
 
A Float specifying the translucency factor to use when displaying the image. Possible values are 0.0                    translucency                                     1.0 with 0.0 being invisible and 1.0 being opaque.                 The default value is 1.0.