drawPolyline | R Documentation |
drawPolyline
draws polygonal lines over an
Image
object. This operation is destructive: it changes
irreversibly the Image
object and cannot be undone.
drawPolyline(image, line, closed = FALSE, color = "red", thickness = 1)
image |
An |
line |
An m x 2 matrix (or an object that can be converted to an m x 2 matrix) or a list of m x 2 matrices, with the first column containing the x coordinates of the polygonal lines and the second column containing the y coordinates of the polygonal lines. |
closed |
A boolean indicating whether the drawn polylines are closed or not (default: FALSE). If they are closed, the function draws a line from the last vertex of each curve to its first vertex. |
color |
A value or vector of any kind of R color specification compatible
with |
thickness |
A numeric value representing the thickness in pixels of the line (default: 1). |
This function does not return anything. It modifies image
in
place.
Simon Garnier, garnier@njit.edu
Image
, selectROI
, fillConvexPoly
balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
poly <- data.frame(x = c(290, 290, 440, 440), y = c(170, 325, 325, 170))
drawPolyline(balloon, poly, closed = FALSE, color = "red", thickness = 3)
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