OffsetMapper¶

class ginga.canvas.coordmap.OffsetMapper(viewer, refobj)[source]¶

Bases: ginga.canvas.coordmap.BaseMapper

A coordinate mapper that maps to the viewer in data coordinates that are offsets relative to some other reference object.

Methods Summary

`calc_offsets`(self, pts)
`data_to`(self, data_pts[, viewer])
`offset_pt`(self, pts, offset)	Offset a point specified by `pt`, by the offsets `offset`.
`rotate_pt`(self, pts, theta, offset)	Rotate a point specified by `pt` by the angle `theta` (in degrees) around the point indicated by `offset`.
`to_data`(self, delta_pt[, viewer])

Methods Documentation

offset_pt(self, pts, offset)[source]¶: Offset a point specified by pt, by the offsets offset. Coordinates are assumed to be in the space defined by this mapper.

rotate_pt(self, pts, theta, offset)[source]¶: Rotate a point specified by pt by the angle theta (in degrees) around the point indicated by offset. Coordinates are assumed to be in the space defined by this mapper.