Project 3D coordinates to a 2D plane

Selects two of three coordinate axes based on the anatomical plane, returning a data frame with u (horizontal) and v (vertical) columns.

Usage

projectTo2D(x, y, z, plane = c("sagittal", "frontal", "transverse"))

Arguments

x

Numeric vector of X (medial-lateral) coordinates.

y

Numeric vector of Y (anterior-posterior) coordinates.

z

Numeric vector of Z (vertical) coordinates.

plane

Character string specifying the projection plane. One of "sagittal", "frontal", or "transverse".

Value

A data frame with columns u and v.

References

Winter DA (2009). "Biomechanics and Motor Control of Human Movement." 4th ed. John Wiley & Sons.

See also

plotSkeleton() for 2D skeleton visualization, plotSkeleton3D() for pseudo-3D skeleton rendering.

Examples

proj <- projectTo2D(c(1, 2), c(3, 4), c(5, 6), plane = "sagittal")
proj$u  # Y values (anterior-posterior)
#> [1] 3 4
proj$v  # Z values (vertical)
#> [1] 5 6