Flip an ROI's y-axis

Convert between image orientation (top-left origin, y down) and GIS orientation (bottom-left origin, y up). Self-inverse.

Usage

at_flip_y(roi, height, call = rlang::caller_env())

Arguments

roi

An annot_roi.

height

Numeric image height in pixels at the ROI's reference level.

call

The calling environment, for error reporting.

Value

An annot_roi with the y-axis flipped.

See also

Other geometry: at_check_containment(), at_check_geometry(), at_clamp(), at_fix_geometry(), at_roi_buffer(), at_roi_contains(), at_roi_distance(), at_roi_overlaps(), at_roi_rescale(), at_roi_ring(), at_roi_setops, at_roi_simplify(), at_rois_overlap(), at_snap(), at_transform()

Examples

at_flip_y(at_roi_rect(0, 0, 10, 5, label = "a"), height = 100)
#> <annot_roi> a (POLYGON)
#> id: "roi_000000014"  |  level: 0  |  source: manual
#> bbox: [0, 95] - [10, 100]