Orientation of a region.
The operator ::orientation_region calculates the orientation of the region. The operator is based on ::elliptic_axis. In addition the point on the contour with maximal distance to the center of gravity is calculated. If the column coordinate of this point is less than the column coordinate of the center of gravity the value of Pi is added to the angle.
If more than one region is passed the results are stored in tuples, the index of a value in the tuple corresponding to the index of a region in the input.
In case of empty region all parameters have the value 0.0 if no other behavior was set (see ::set_system('no_object_result',<Result>)).
|
Regions (input_object) |
region(-array) -> Hobject: HRegion(Array) |
| Region(s) to be examined. | |
|
Phi (output_control) |
real(-array) -> (HTuple.) double * |
| Orientation of region (arc measure). | |
| Assertion: ((- pi / 2) < Phi) && (Phi <= ((3 * pi) / 2)) | |
If F is the area of a region the mean runtime complexity is O(F).
The operator ::orientation_region returns the value H_MSG_TRUE if the input is not empty. The behavior in case of empty input (no input regions available) is set via the operator ::set_system('no_object_result',<Result>). The behavior in case of empty region (the region is the empty set) is set via ::set_system('empty_region_result',<Result>). If necessary an exception handling is raised.
::threshold, ::regiongrowing, ::connection
::elliptic_axis, ::smallest_rectangle2
::moments_region_2nd, ::line_orientation
Region processing
