distanceToPlane | R Documentation |
Compute the (shortest) distance between the starting point of a track and a reference plane. Useful to detect directed movement and/or tracking artefacts.
distanceToPlane(x, p1 = c(0, 0, 0), p2 = c(0, 1, 0), p3 = c(1, 0, 0), from = 1)
x |
a single input track; a matrix whose first column is time and whose remaining columns are a spatial coordinate. |
p1, p2, p3 |
numeric vectors of coordinates of three points specifying a reference plane to compute distances to. |
from |
index, or vector of indices, of the first row of the track. If
|
A single distance.
angleToPlane
to compute the angle to the plane, and
AngleAnalysis
for other methods to compute angles and distances.
## Plotting the angle versus the distance to a reference plane can be informative to ## detect tracking artefacts near the border of the imaging volume. ## We should be suspicious especially when small angles are more frequent at low distances ## to the border planes. load( system.file("extdata", "TCellsRaw.rda", package="celltrackR" ) ) steps <- subtracks( TCellsRaw, 1 ) minz <- boundingBox( TCellsRaw )["min","z"] ## Compute angles and distances to the lower plane in z-dimension angles <- sapply( steps, angleToPlane, p1 = c(0,0,minz), p2 = c(1,0,minz), p3 = c(0,1,minz) ) distances <- sapply( steps, distanceToPlane, p1 = c(0,0,minz), p2 = c(1,0,minz), p3 = c(0,1,minz) ) scatter.smooth( distances, angles ) abline( h = 32.7, col = "red" )
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