Filter: add an erosion effect to an element

The filter_erode() filter effectively thins out a source graphic by a given radius value. The higher the radius, the greater the extent of thinning.

filter_erode(radius = 1)

Arguments

radius	The extent to which the source graphic will be eroded. If a vector of two values are provided, the first value represents the x-radius and the second one the y-radius. If one value is provided, then that value is used for both x and y.

Examples

# Add a text element to an
# SVG drawing and erode it with
# the `filter_erode()` filter
SVG(width = 200, height = 100) %>%
  svg_filter(
    id = "erode",
    filters = list(
      filter_erode(radius = c(1, 0))
    )
  ) %>%
  svg_text(
    x = 10, y = 40,
    text = "Erosion",
    attrs = svg_attrs_pres(
      font_size = "3em",
      font_weight = "bolder",
      filter = "erode"
    )
  )
#> <svg width="200" height="100">
#>   <defs>
#>     <filter id="erode" width="200" height="100">
#>       <feMorphology operator="erode" radius="1 0"/>
#>     </filter>
#>   </defs>
#>   <text x="10" y="40" font-size="3em" font-weight="bolder" filter="url(#erode)">Erosion</text>
#> </svg>