Convert CPCe coordinates to image pixel coordinates — convert_cpce

Converts point coordinates from the CPCe coordinate space to actual image pixels by proportional scaling. Original CPCe coordinates are preserved.

Usage

convert_cpce_coords(
  points,
  cpce_width = NULL,
  cpce_height = NULL,
  image_width = NULL,
  image_height = NULL
)

Arguments

points: A data frame with cpce_x and cpce_y columns.
cpce_width, cpce_height: CPCe coordinate-space width and height. If NULL, the function uses points$cpce_width and points$cpce_height.
image_width, image_height: Image width and height in pixels. If NULL, the function uses points$image_width and points$image_height.

Value

A tibble with updated x_px and y_px columns.

Examples

pts <- tibble::tibble(cpce_x = c(0, 50, 100), cpce_y = c(0, 25, 50))
convert_cpce_coords(pts, 100, 50, 1000, 500)
#> # A tibble: 3 × 8
#>   cpce_x cpce_y cpce_width cpce_height image_width image_height  x_px  y_px
#>    <dbl>  <dbl>      <dbl>       <dbl>       <int>        <int> <int> <int>
#> 1      0      0        100          50        1000          500     0     0
#> 2     50     25        100          50        1000          500   500   250
#> 3    100     50        100          50        1000          500  1000   500